{"id":30209,"date":"2026-07-20T14:25:10","date_gmt":"2026-07-20T06:25:10","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30209"},"modified":"2026-07-21T11:19:58","modified_gmt":"2026-07-21T03:19:58","slug":"ups-surge-protection-device-input-bypass-and-output-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/","title":{"rendered":"Perangkat Perlindungan Lonjakan UPS: Panduan Pemilihan Masukan, Bypass, dan Keluaran"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30209\" class=\"elementor elementor-30209\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a2ceefb e-flex e-con-boxed e-con e-parent\" data-id=\"a2ceefb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0c1d557 elementor-widget elementor-widget-html\" data-id=\"0c1d557\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n:root {\r\n  --ly-ups47-primary: #004898;\r\n  --ly-ups47-primary-dark: #00366f;\r\n  --ly-ups47-primary-soft: #eaf3fc;\r\n  --ly-ups47-text: #172230;\r\n  --ly-ups47-muted: #5d6a78;\r\n  --ly-ups47-line: #dce4ec;\r\n  --ly-ups47-bg: #f6f8fb;\r\n  --ly-ups47-white: #ffffff;\r\n  --ly-ups47-success-bg: #edf8f0;\r\n  --ly-ups47-warning-bg: #fff7e8;\r\n  --ly-ups47-danger-bg: #fff1eb;\r\n  --ly-ups47-radius: 14px;\r\n  --ly-ups47-shadow: 0 10px 30px rgba(22, 45, 74, 0.08);\r\n}\r\n\r\n.ly-ups47-page,\r\n.ly-ups47-page * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.ly-ups47-page {\r\n  width: 100%;\r\n  overflow: hidden;\r\n  background: var(--ly-ups47-white);\r\n  color: var(--ly-ups47-text);\r\n  font-family: Arial, Helvetica, sans-serif;\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n}\r\n\r\n.ly-ups47-container {\r\n  width: min(1180px, calc(100% - 48px));\r\n  margin: 0 auto;\r\n}\r\n\r\n.ly-ups47-page p {\r\n  margin: 0 0 16px;\r\n}\r\n\r\n.ly-ups47-page ul,\r\n.ly-ups47-page ol {\r\n  margin-top: 0;\r\n}\r\n\r\n.ly-ups47-page a {\r\n  color: var(--ly-ups47-primary);\r\n  text-decoration: underline;\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n.ly-ups47-page a:hover {\r\n  color: var(--ly-ups47-primary-dark);\r\n}\r\n\r\n.ly-ups47-intro {\r\n  padding: 34px 0 20px;\r\n}\r\n\r\n.ly-ups47-eyebrow {\r\n  display: inline-flex;\r\n  align-items: center;\r\n  gap: 8px;\r\n  margin: 0 0 12px;\r\n  color: var(--ly-ups47-primary);\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n  letter-spacing: 0.08em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.ly-ups47-eyebrow::before {\r\n  width: 26px;\r\n  height: 3px;\r\n  border-radius: 10px;\r\n  background: var(--ly-ups47-primary);\r\n  content: \"\";\r\n}\r\n\r\n.ly-ups47-lead {\r\n  max-width: 960px;\r\n  margin: 0;\r\n  color: #334155;\r\n  font-size: 20px;\r\n  line-height: 1.65;\r\n}\r\n\r\n.ly-ups47-answer {\r\n  margin: 18px 0 34px;\r\n  padding: 28px;\r\n  border: 1px solid #bad2ea;\r\n  border-left: 5px solid var(--ly-ups47-primary);\r\n  border-radius: var(--ly-ups47-radius);\r\n  background:\r\n    linear-gradient(\r\n      135deg,\r\n      rgba(234, 243, 252, 0.96),\r\n      rgba(255, 255, 255, 0.98)\r\n    );\r\n  box-shadow: var(--ly-ups47-shadow);\r\n}\r\n\r\n.ly-ups47-answer-label {\r\n  display: block;\r\n  margin-bottom: 8px;\r\n  color: var(--ly-ups47-primary);\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n  letter-spacing: 0.07em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.ly-ups47-answer-main {\r\n  margin: 0 0 22px;\r\n  color: #11243a;\r\n  font-size: 23px;\r\n  font-weight: 750;\r\n  line-height: 1.48;\r\n}\r\n\r\n.ly-ups47-answer-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(4, minmax(0, 1fr));\r\n  gap: 12px;\r\n}\r\n\r\n.ly-ups47-answer-item {\r\n  min-height: 142px;\r\n  padding: 18px;\r\n  border: 1px solid #d5e2ef;\r\n  border-radius: 11px;\r\n  background: rgba(255, 255, 255, 0.92);\r\n}\r\n\r\n.ly-ups47-answer-item strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: var(--ly-ups47-primary-dark);\r\n  font-size: 16px;\r\n}\r\n\r\n.ly-ups47-answer-item span {\r\n  display: block;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 14px;\r\n  line-height: 1.58;\r\n}\r\n\r\n.ly-ups47-figure {\r\n  width: 100%;\r\n  margin: 28px 0 38px;\r\n}\r\n\r\n.ly-ups47-figure-frame {\r\n  width: 100%;\r\n  overflow: hidden;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: var(--ly-ups47-radius);\r\n  background: #ffffff;\r\n  box-shadow: var(--ly-ups47-shadow);\r\n}\r\n\r\n.ly-ups47-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  height: auto;\r\n  margin: 0;\r\n  border: 0;\r\n  object-fit: contain;\r\n}\r\n\r\n.ly-ups47-figure figcaption {\r\n  margin: 11px auto 0;\r\n  padding: 0 8px;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 13px;\r\n  line-height: 1.55;\r\n  text-align: center;\r\n}\r\n\r\n.ly-ups47-search-bridge {\r\n  margin: 0 0 36px;\r\n  padding: 28px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: var(--ly-ups47-radius);\r\n  background: var(--ly-ups47-bg);\r\n}\r\n\r\n.ly-ups47-search-bridge h2 {\r\n  margin: 0 0 14px;\r\n  color: #102338;\r\n  font-size: 27px;\r\n  line-height: 1.3;\r\n}\r\n\r\n.ly-ups47-search-bridge-lead {\r\n  max-width: 930px;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 17px;\r\n}\r\n\r\n.ly-ups47-bridge-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 18px;\r\n  margin-top: 22px;\r\n}\r\n\r\n.ly-ups47-bridge-card {\r\n  padding: 21px;\r\n  border: 1px solid #d5e0eb;\r\n  border-radius: 11px;\r\n  background: #ffffff;\r\n}\r\n\r\n.ly-ups47-bridge-card strong {\r\n  display: block;\r\n  margin-bottom: 8px;\r\n  color: #173650;\r\n  font-size: 17px;\r\n}\r\n\r\n.ly-ups47-bridge-card p {\r\n  margin: 0;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 15px;\r\n  line-height: 1.62;\r\n}\r\n\r\n.ly-ups47-toc {\r\n  margin: 0 0 42px;\r\n  padding: 24px 26px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: var(--ly-ups47-radius);\r\n  background: var(--ly-ups47-bg);\r\n}\r\n\r\n.ly-ups47-toc-title {\r\n  margin: 0 0 13px;\r\n  color: #1f3045;\r\n  font-size: 17px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-ups47-toc ol {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 7px 30px;\r\n  margin: 0;\r\n  padding-left: 22px;\r\n}\r\n\r\n.ly-ups47-toc li {\r\n  padding-left: 3px;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 15px;\r\n}\r\n\r\n.ly-ups47-section {\r\n  padding: 54px 0;\r\n  border-top: 1px solid #edf1f5;\r\n}\r\n\r\n.ly-ups47-section-alt {\r\n  position: relative;\r\n  background: var(--ly-ups47-bg);\r\n}\r\n\r\n.ly-ups47-section-alt::before,\r\n.ly-ups47-section-alt::after {\r\n  position: absolute;\r\n  top: 0;\r\n  bottom: 0;\r\n  width: 100vw;\r\n  background: var(--ly-ups47-bg);\r\n  content: \"\";\r\n}\r\n\r\n.ly-ups47-section-alt::before {\r\n  right: 100%;\r\n}\r\n\r\n.ly-ups47-section-alt::after {\r\n  left: 100%;\r\n}\r\n\r\n.ly-ups47-section h2 {\r\n  margin: 0 0 20px;\r\n  color: #102338;\r\n  font-size: 32px;\r\n  line-height: 1.25;\r\n  letter-spacing: -0.02em;\r\n}\r\n\r\n.ly-ups47-section h3 {\r\n  margin: 30px 0 12px;\r\n  color: #17334e;\r\n  font-size: 22px;\r\n  line-height: 1.35;\r\n}\r\n\r\n.ly-ups47-section h4 {\r\n  margin: 20px 0 8px;\r\n  color: #1d3c58;\r\n  font-size: 18px;\r\n  line-height: 1.4;\r\n}\r\n\r\n.ly-ups47-section-intro {\r\n  max-width: 920px;\r\n  margin-bottom: 28px !important;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 18px;\r\n}\r\n\r\n.ly-ups47-keyline {\r\n  margin: 26px 0;\r\n  padding: 20px 22px;\r\n  border-left: 4px solid var(--ly-ups47-primary);\r\n  background: var(--ly-ups47-primary-soft);\r\n  color: #173652;\r\n  font-size: 19px;\r\n  font-weight: 700;\r\n  line-height: 1.55;\r\n}\r\n\r\n.ly-ups47-two-col {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 24px;\r\n  margin-top: 24px;\r\n}\r\n\r\n.ly-ups47-three-col {\r\n  display: grid;\r\n  grid-template-columns: repeat(3, minmax(0, 1fr));\r\n  gap: 18px;\r\n  margin-top: 25px;\r\n}\r\n\r\n.ly-ups47-card {\r\n  height: 100%;\r\n  padding: 24px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: var(--ly-ups47-radius);\r\n  background: var(--ly-ups47-white);\r\n  box-shadow: 0 5px 18px rgba(20, 42, 66, 0.05);\r\n}\r\n\r\n.ly-ups47-card h3,\r\n.ly-ups47-card h4 {\r\n  margin-top: 0;\r\n}\r\n\r\n.ly-ups47-card ul,\r\n.ly-ups47-card ol {\r\n  margin: 12px 0 0;\r\n  padding-left: 22px;\r\n}\r\n\r\n.ly-ups47-card li {\r\n  margin-bottom: 8px;\r\n}\r\n\r\n.ly-ups47-card-purpose {\r\n  border-top: 4px solid var(--ly-ups47-primary);\r\n}\r\n\r\n.ly-ups47-card-risk {\r\n  border-top: 4px solid #d97706;\r\n}\r\n\r\n.ly-ups47-path-card {\r\n  position: relative;\r\n  padding-top: 58px;\r\n}\r\n\r\n.ly-ups47-path-number {\r\n  position: absolute;\r\n  top: 19px;\r\n  left: 22px;\r\n  display: inline-flex;\r\n  width: 29px;\r\n  height: 29px;\r\n  align-items: center;\r\n  justify-content: center;\r\n  border-radius: 8px;\r\n  background: var(--ly-ups47-primary);\r\n  color: #ffffff;\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-ups47-path-card:nth-child(2) .ly-ups47-path-number,\r\n.ly-ups47-path-card:nth-child(3) .ly-ups47-path-number {\r\n  background: #c27313;\r\n}\r\n\r\n.ly-ups47-path-card h3 {\r\n  margin-bottom: 9px;\r\n  font-size: 19px;\r\n}\r\n\r\n.ly-ups47-path-card p {\r\n  margin-bottom: 0;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 15px;\r\n}\r\n\r\n.ly-ups47-note,\r\n.ly-ups47-warning,\r\n.ly-ups47-critical,\r\n.ly-ups47-standard-alert {\r\n  margin: 26px 0;\r\n  padding: 20px 22px;\r\n  border-radius: 11px;\r\n}\r\n\r\n.ly-ups47-note {\r\n  border: 1px solid #bdd9c5;\r\n  background: var(--ly-ups47-success-bg);\r\n  color: #245233;\r\n}\r\n\r\n.ly-ups47-warning {\r\n  border: 1px solid #efd39a;\r\n  background: var(--ly-ups47-warning-bg);\r\n  color: #66410f;\r\n}\r\n\r\n.ly-ups47-critical {\r\n  border: 1px solid #efc4b3;\r\n  background: var(--ly-ups47-danger-bg);\r\n  color: #78350f;\r\n}\r\n\r\n.ly-ups47-standard-alert {\r\n  border: 1px solid #9dbfe0;\r\n  border-left: 5px solid var(--ly-ups47-primary);\r\n  background: #edf5fc;\r\n  color: #173b5c;\r\n}\r\n\r\n.ly-ups47-note strong,\r\n.ly-ups47-warning strong,\r\n.ly-ups47-critical strong,\r\n.ly-ups47-standard-alert strong {\r\n  display: block;\r\n  margin-bottom: 5px;\r\n}\r\n\r\n.ly-ups47-table-wrap {\r\n  width: 100%;\r\n  margin: 24px 0 30px;\r\n  overflow-x: auto;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: 12px;\r\n  background: #ffffff;\r\n  -webkit-overflow-scrolling: touch;\r\n}\r\n\r\n.ly-ups47-table {\r\n  width: 100%;\r\n  min-width: 760px;\r\n  border-collapse: collapse;\r\n}\r\n\r\n.ly-ups47-table th,\r\n.ly-ups47-table td {\r\n  padding: 15px 17px;\r\n  border-right: 1px solid var(--ly-ups47-line);\r\n  border-bottom: 1px solid var(--ly-ups47-line);\r\n  vertical-align: top;\r\n  text-align: left;\r\n}\r\n\r\n.ly-ups47-table th:last-child,\r\n.ly-ups47-table td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n.ly-ups47-table tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n.ly-ups47-table thead th {\r\n  background: var(--ly-ups47-primary);\r\n  color: #ffffff;\r\n  font-size: 14px;\r\n  line-height: 1.45;\r\n}\r\n\r\n.ly-ups47-table tbody td {\r\n  color: #334155;\r\n  font-size: 15px;\r\n  line-height: 1.58;\r\n}\r\n\r\n.ly-ups47-table tbody td:first-child {\r\n  color: #173a59;\r\n  font-weight: 750;\r\n}\r\n\r\n.ly-ups47-decision {\r\n  margin-top: 26px;\r\n  counter-reset: ly-ups47-step;\r\n}\r\n\r\n.ly-ups47-decision-item {\r\n  position: relative;\r\n  margin: 0 0 14px;\r\n  padding: 20px 20px 20px 70px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: 11px;\r\n  background: #ffffff;\r\n  counter-increment: ly-ups47-step;\r\n}\r\n\r\n.ly-ups47-decision-item::before {\r\n  position: absolute;\r\n  top: 19px;\r\n  left: 20px;\r\n  display: flex;\r\n  width: 34px;\r\n  height: 34px;\r\n  align-items: center;\r\n  justify-content: center;\r\n  border-radius: 50%;\r\n  background: var(--ly-ups47-primary);\r\n  color: #ffffff;\r\n  content: counter(ly-ups47-step);\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-ups47-decision-item strong {\r\n  display: block;\r\n  margin-bottom: 5px;\r\n  color: #183754;\r\n}\r\n\r\n.ly-ups47-decision-item p {\r\n  margin: 0;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 15px;\r\n}\r\n\r\n.ly-ups47-verdict-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(3, minmax(0, 1fr));\r\n  gap: 16px;\r\n  margin: 26px 0;\r\n}\r\n\r\n.ly-ups47-verdict {\r\n  padding: 21px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: 11px;\r\n  background: #ffffff;\r\n}\r\n\r\n.ly-ups47-verdict-label {\r\n  display: inline-block;\r\n  margin-bottom: 10px;\r\n  padding: 4px 9px;\r\n  border-radius: 99px;\r\n  font-size: 12px;\r\n  font-weight: 800;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.ly-ups47-verdict-yes .ly-ups47-verdict-label {\r\n  background: #e6f5ea;\r\n  color: #166534;\r\n}\r\n\r\n.ly-ups47-verdict-check .ly-ups47-verdict-label {\r\n  background: #fff2cf;\r\n  color: #854d0e;\r\n}\r\n\r\n.ly-ups47-verdict strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #173650;\r\n}\r\n\r\n.ly-ups47-verdict p {\r\n  margin: 0;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 14px;\r\n  line-height: 1.58;\r\n}\r\n\r\n.ly-ups47-scenario-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 20px;\r\n  margin-top: 27px;\r\n}\r\n\r\n.ly-ups47-scenario {\r\n  padding: 24px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: var(--ly-ups47-radius);\r\n  background: #ffffff;\r\n}\r\n\r\n.ly-ups47-scenario-number {\r\n  display: inline-flex;\r\n  width: 36px;\r\n  height: 36px;\r\n  align-items: center;\r\n  justify-content: center;\r\n  margin-bottom: 13px;\r\n  border-radius: 9px;\r\n  background: var(--ly-ups47-primary-soft);\r\n  color: var(--ly-ups47-primary);\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-ups47-scenario h3 {\r\n  margin: 0 0 10px;\r\n  font-size: 20px;\r\n}\r\n\r\n.ly-ups47-scenario p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.ly-ups47-proof-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(3, minmax(0, 1fr));\r\n  gap: 18px;\r\n  margin-top: 26px;\r\n}\r\n\r\n.ly-ups47-proof {\r\n  padding: 23px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: 12px;\r\n  background: #ffffff;\r\n}\r\n\r\n.ly-ups47-proof-icon {\r\n  display: inline-flex;\r\n  width: 39px;\r\n  height: 39px;\r\n  align-items: center;\r\n  justify-content: center;\r\n  margin-bottom: 13px;\r\n  border-radius: 10px;\r\n  background: var(--ly-ups47-primary-soft);\r\n  color: var(--ly-ups47-primary);\r\n  font-size: 16px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-ups47-proof h3 {\r\n  margin: 0 0 9px;\r\n  font-size: 19px;\r\n}\r\n\r\n.ly-ups47-proof p {\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 15px;\r\n}\r\n\r\n.ly-ups47-proof p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.ly-ups47-proof-link {\r\n  font-weight: 750;\r\n}\r\n\r\n.ly-ups47-checklist {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 12px 20px;\r\n  margin: 25px 0;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n.ly-ups47-checklist li {\r\n  position: relative;\r\n  min-height: 58px;\r\n  margin: 0;\r\n  padding: 15px 16px 15px 47px;\r\n  border: 1px solid var(--ly-ups47-line);\r\n  border-radius: 10px;\r\n  background: #ffffff;\r\n  color: #334155;\r\n  font-size: 15px;\r\n}\r\n\r\n.ly-ups47-checklist li::before {\r\n  position: absolute;\r\n  top: 15px;\r\n  left: 16px;\r\n  display: flex;\r\n  width: 22px;\r\n  height: 22px;\r\n  align-items: center;\r\n  justify-content: center;\r\n  border-radius: 50%;\r\n  background: var(--ly-ups47-primary);\r\n  color: #ffffff;\r\n  content: \"\u2713\";\r\n  font-size: 12px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-ups47-mistakes {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 15px;\r\n  margin-top: 24px;\r\n}\r\n\r\n.ly-ups47-mistake {\r\n  padding: 19px 20px;\r\n  border-left: 4px solid #dc6b38;\r\n  border-radius: 8px;\r\n  background: #fff7f2;\r\n}\r\n\r\n.ly-ups47-mistake strong {\r\n  display: block;\r\n  margin-bottom: 5px;\r\n  color: 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position: relative;\r\n  padding: 18px 48px 18px 20px;\r\n  color: #173650;\r\n  cursor: pointer;\r\n  font-size: 17px;\r\n  font-weight: 750;\r\n  list-style: none;\r\n}\r\n\r\n.ly-ups47-faq-item summary::-webkit-details-marker {\r\n  display: none;\r\n}\r\n\r\n.ly-ups47-faq-item summary::after {\r\n  position: absolute;\r\n  top: 17px;\r\n  right: 20px;\r\n  color: var(--ly-ups47-primary);\r\n  content: \"+\";\r\n  font-size: 23px;\r\n  font-weight: 700;\r\n}\r\n\r\n.ly-ups47-faq-item[open] summary::after {\r\n  content: \"\u2212\";\r\n}\r\n\r\n.ly-ups47-faq-answer {\r\n  padding: 0 20px 18px;\r\n  color: var(--ly-ups47-muted);\r\n}\r\n\r\n.ly-ups47-faq-answer p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.ly-ups47-review {\r\n  display: flex;\r\n  align-items: center;\r\n  justify-content: space-between;\r\n  gap: 24px;\r\n  margin: 0 0 34px;\r\n  padding: 20px 22px;\r\n  border: 1px solid #cbd8e5;\r\n  border-radius: 11px;\r\n  background: #ffffff;\r\n}\r\n\r\n.ly-ups47-review strong {\r\n  display: block;\r\n  color: #173650;\r\n}\r\n\r\n.ly-ups47-review span {\r\n  display: block;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 14px;\r\n}\r\n\r\n.ly-ups47-sources {\r\n  margin: 0;\r\n  padding-left: 22px;\r\n}\r\n\r\n.ly-ups47-sources li {\r\n  margin-bottom: 11px;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n.ly-ups47-sources a {\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n.ly-ups47-footnote {\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 13px;\r\n  line-height: 1.55;\r\n}\r\n\r\n\/* Final CTA: single-column, compact and theme-safe *\/\r\n.ly-ups47-cta {\r\n  margin: 44px 0 60px;\r\n  overflow: hidden;\r\n  border: 1px solid #cbd9e7;\r\n  border-left: 5px solid var(--ly-ups47-primary);\r\n  border-radius: 12px;\r\n  background:\r\n    linear-gradient(\r\n      135deg,\r\n      #ffffff 0%,\r\n      #ffffff 68%,\r\n      #f4f8fc 100%\r\n    );\r\n  box-shadow: 0 10px 28px rgba(23, 50, 78, 0.07);\r\n}\r\n\r\n.ly-ups47-cta-inner {\r\n  padding: 30px 34px;\r\n}\r\n\r\n.ly-ups47-cta-content {\r\n  width: 100%;\r\n  max-width: 950px;\r\n}\r\n\r\n.ly-ups47-cta-label {\r\n  display: block;\r\n  margin: 0 0 8px;\r\n  color: var(--ly-ups47-primary);\r\n  font-size: 12px;\r\n  font-weight: 800;\r\n  letter-spacing: 0.09em;\r\n  line-height: 1.4;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.ly-ups47-cta h2 {\r\n  max-width: 900px;\r\n  margin: 0 0 12px;\r\n  color: #102338;\r\n  font-size: 28px;\r\n  font-weight: 800;\r\n  line-height: 1.25;\r\n  letter-spacing: -0.02em;\r\n}\r\n\r\n.ly-ups47-cta p {\r\n  max-width: 920px;\r\n  margin: 0;\r\n  color: var(--ly-ups47-muted);\r\n  font-size: 16px;\r\n  line-height: 1.68;\r\n}\r\n\r\n.ly-ups47-cta-action {\r\n  display: flex;\r\n  align-items: center;\r\n  justify-content: flex-start;\r\n  margin-top: 22px;\r\n}\r\n\r\n.ly-ups47-page .ly-ups47-btn,\r\n.ly-ups47-page a.ly-ups47-btn,\r\n.ly-ups47-page .leeyee-site-popup-btn.ly-ups47-btn {\r\n  display: inline-flex !important;\r\n  width: auto !important;\r\n  min-width: 236px !important;\r\n  min-height: 50px !important;\r\n  align-items: center !important;\r\n  justify-content: center !important;\r\n  padding: 13px 22px !important;\r\n  border: 1px solid var(--ly-ups47-primary) !important;\r\n  border-radius: 8px !important;\r\n  background: var(--ly-ups47-primary) !important;\r\n  color: #ffffff !important;\r\n  -webkit-text-fill-color: #ffffff !important;\r\n  font-size: 15px !important;\r\n  font-weight: 800 !important;\r\n  line-height: 1.25 !important;\r\n  text-align: center !important;\r\n  text-decoration: none !important;\r\n  text-indent: 0 !important;\r\n  white-space: nowrap !important;\r\n  opacity: 1 !important;\r\n  visibility: visible !important;\r\n  box-shadow: 0 7px 18px rgba(0, 72, 152, 0.16);\r\n  transition:\r\n    background-color 0.2s ease,\r\n    border-color 0.2s ease,\r\n    transform 0.2s ease,\r\n    box-shadow 0.2s ease;\r\n}\r\n\r\n.ly-ups47-page .ly-ups47-btn span,\r\n.ly-ups47-page a.ly-ups47-btn span,\r\n.ly-ups47-page .leeyee-site-popup-btn.ly-ups47-btn span {\r\n  position: static !important;\r\n  display: inline !important;\r\n  width: auto !important;\r\n  height: auto !important;\r\n  margin: 0 !important;\r\n  padding: 0 !important;\r\n  overflow: visible !important;\r\n  color: #ffffff !important;\r\n  -webkit-text-fill-color: #ffffff !important;\r\n  font-family: Arial, Helvetica, sans-serif !important;\r\n  font-size: 15px !important;\r\n  font-weight: 800 !important;\r\n  line-height: 1.25 !important;\r\n  letter-spacing: 0 !important;\r\n  text-align: center !important;\r\n  text-indent: 0 !important;\r\n  text-transform: none !important;\r\n  white-space: nowrap !important;\r\n  opacity: 1 !important;\r\n  visibility: visible !important;\r\n  clip: auto !important;\r\n  clip-path: none !important;\r\n  transform: none !important;\r\n}\r\n\r\n.ly-ups47-page .ly-ups47-btn:hover,\r\n.ly-ups47-page a.ly-ups47-btn:hover {\r\n  border-color: var(--ly-ups47-primary-dark) !important;\r\n  background: var(--ly-ups47-primary-dark) !important;\r\n  color: #ffffff !important;\r\n  -webkit-text-fill-color: #ffffff !important;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 10px 22px rgba(0, 72, 152, 0.22);\r\n}\r\n\r\n.ly-ups47-page .ly-ups47-btn:hover span {\r\n  color: #ffffff !important;\r\n  -webkit-text-fill-color: #ffffff !important;\r\n}\r\n\r\n.ly-ups47-page .ly-ups47-btn:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, 0.25);\r\n  outline-offset: 4px;\r\n}\r\n\r\n\/* 1440px *\/\r\n@media (max-width: 1440px) {\r\n  .ly-ups47-container {\r\n    width: min(1140px, calc(100% - 48px));\r\n  }\r\n}\r\n\r\n\/* 1366px *\/\r\n@media (max-width: 1366px) {\r\n  .ly-ups47-container {\r\n    width: min(1100px, calc(100% - 44px));\r\n  }\r\n\r\n  .ly-ups47-section h2 {\r\n    font-size: 30px;\r\n  }\r\n}\r\n\r\n\/* 1280px *\/\r\n@media (max-width: 1280px) {\r\n  .ly-ups47-answer-grid {\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  }\r\n}\r\n\r\n\/* 1024px *\/\r\n@media (max-width: 1024px) {\r\n  .ly-ups47-page {\r\n    font-size: 16px;\r\n  }\r\n\r\n  .ly-ups47-container {\r\n    width: calc(100% - 40px);\r\n  }\r\n\r\n  .ly-ups47-section {\r\n    padding: 48px 0;\r\n  }\r\n\r\n  .ly-ups47-three-col,\r\n  .ly-ups47-proof-grid,\r\n  .ly-ups47-related {\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  }\r\n\r\n  .ly-ups47-verdict-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .ly-ups47-cta-inner {\r\n    padding: 28px 30px;\r\n  }\r\n\r\n  .ly-ups47-cta h2 {\r\n    font-size: 27px;\r\n  }\r\n}\r\n\r\n\/* 912px *\/\r\n@media (max-width: 912px) {\r\n  .ly-ups47-two-col,\r\n  .ly-ups47-scenario-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n}\r\n\r\n\/* 820px *\/\r\n@media (max-width: 820px) {\r\n  .ly-ups47-toc ol,\r\n  .ly-ups47-checklist,\r\n  .ly-ups47-mistakes,\r\n  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.ly-ups47-cta-action {\r\n    margin-top: 19px;\r\n  }\r\n\r\n  .ly-ups47-page .ly-ups47-btn,\r\n  .ly-ups47-page a.ly-ups47-btn,\r\n  .ly-ups47-page .leeyee-site-popup-btn.ly-ups47-btn {\r\n    width: 100% !important;\r\n    min-width: 0 !important;\r\n  }\r\n}\r\n\r\n\/* 540px *\/\r\n@media (max-width: 540px) {\r\n  .ly-ups47-page {\r\n    font-size: 15.5px;\r\n  }\r\n\r\n  .ly-ups47-toc {\r\n    padding: 20px;\r\n  }\r\n\r\n  .ly-ups47-keyline {\r\n    padding: 18px;\r\n    font-size: 17px;\r\n  }\r\n\r\n  .ly-ups47-table th,\r\n  .ly-ups47-table td {\r\n    padding: 13px 14px;\r\n  }\r\n}\r\n\r\n\/* 480px *\/\r\n@media (max-width: 480px) {\r\n  .ly-ups47-container {\r\n    width: calc(100% - 24px);\r\n  }\r\n\r\n  .ly-ups47-answer {\r\n    padding: 20px;\r\n  }\r\n\r\n  .ly-ups47-answer-main {\r\n    font-size: 19px;\r\n  }\r\n\r\n  .ly-ups47-section h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  .ly-ups47-section h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .ly-ups47-search-bridge h2 {\r\n    font-size: 23px;\r\n  }\r\n\r\n  .ly-ups47-card,\r\n  .ly-ups47-scenario,\r\n  .ly-ups47-proof {\r\n    padding: 20px;\r\n  }\r\n\r\n  .ly-ups47-figure {\r\n    margin: 20px 0 28px;\r\n  }\r\n}\r\n\r\n\/* 430px *\/\r\n@media (max-width: 430px) {\r\n  .ly-ups47-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .ly-ups47-answer-item {\r\n    padding: 16px;\r\n  }\r\n\r\n  .ly-ups47-faq-item summary {\r\n    font-size: 16px;\r\n  }\r\n}\r\n\r\n\/* 414px *\/\r\n@media (max-width: 414px) {\r\n  .ly-ups47-note,\r\n  .ly-ups47-warning,\r\n  .ly-ups47-critical,\r\n  .ly-ups47-standard-alert {\r\n    padding: 17px;\r\n  }\r\n}\r\n\r\n\/* 390px *\/\r\n@media (max-width: 390px) {\r\n  .ly-ups47-container {\r\n    width: calc(100% - 20px);\r\n  }\r\n\r\n  .ly-ups47-section h2 {\r\n    font-size: 23px;\r\n  }\r\n\r\n  .ly-ups47-cta-inner {\r\n    padding: 22px 17px;\r\n  }\r\n\r\n  .ly-ups47-cta h2 {\r\n    font-size: 22px;\r\n  }\r\n\r\n  .ly-ups47-page .ly-ups47-btn span {\r\n    white-space: normal !important;\r\n  }\r\n}\r\n\r\n\/* 375px *\/\r\n@media (max-width: 375px) {\r\n  .ly-ups47-eyebrow {\r\n    font-size: 12px;\r\n  }\r\n\r\n  .ly-ups47-answer {\r\n    border-left-width: 4px;\r\n  }\r\n\r\n  .ly-ups47-toc li {\r\n    font-size: 14px;\r\n  }\r\n}\r\n\r\n\/* 360px *\/\r\n@media (max-width: 360px) {\r\n  .ly-ups47-page {\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-ups47-card,\r\n  .ly-ups47-scenario,\r\n  .ly-ups47-proof {\r\n    padding: 17px;\r\n  }\r\n\r\n  .ly-ups47-decision-item {\r\n    padding-left: 55px;\r\n  }\r\n}\r\n\r\n\/* 320px *\/\r\n@media (max-width: 320px) {\r\n  .ly-ups47-container {\r\n    width: calc(100% - 16px);\r\n  }\r\n\r\n  .ly-ups47-answer,\r\n  .ly-ups47-toc,\r\n  .ly-ups47-search-bridge {\r\n    padding: 16px;\r\n  }\r\n\r\n  .ly-ups47-section h2 {\r\n    font-size: 22px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"ly-ups47-page\">\r\n  <div class=\"ly-ups47-container\">\r\n\r\n    <header class=\"ly-ups47-intro\">\r\n      <p class=\"ly-ups47-eyebrow\">\r\n        UPS Power Distribution and SPD Engineering Guide\r\n      <\/p>\r\n\r\n      <p class=\"ly-ups47-lead\">\r\n        A UPS surge protection device is still required in many commercial\r\n        and industrial UPS systems because the UPS itself does not replace\r\n        coordinated distribution-level surge protection. The normal input,\r\n        static bypass, maintenance bypass and output distribution must be\r\n        assessed as separate electrical paths.\r\n      <\/p>\r\n    <\/header>\r\n\r\n    <section class=\"ly-ups47-answer\" aria-label=\"Quick engineering answer\">\r\n      <span class=\"ly-ups47-answer-label\">Quick engineering answer<\/span>\r\n\r\n      <p class=\"ly-ups47-answer-main\">\r\n        Protect the UPS normal input, evaluate every bypass source as a\r\n        possible direct path to the critical load, and install an output SPD\r\n        only when the UPS topology and downstream distribution create a\r\n        defined surge risk.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-answer-grid\">\r\n        <div class=\"ly-ups47-answer-item\">\r\n          <strong>UPS normal input<\/strong>\r\n          <span>\r\n            A coordinated Type 2 SPD is common at the UPS input distribution\r\n            board, with Type 1 or Type 1+2 protection upstream where required.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-answer-item\">\r\n          <strong>Static bypass<\/strong>\r\n          <span>\r\n            The bypass must remain inside the protected zone. An independent\r\n            bypass source may require its own SPD.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-answer-item\">\r\n          <strong>Maintenance bypass<\/strong>\r\n          <span>\r\n            Protection must remain effective while the UPS cabinet is\r\n            isolated for maintenance.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-answer-item\">\r\n          <strong>UPS output<\/strong>\r\n          <span>\r\n            Conditional. Confirm source behaviour, cable length, remote\r\n            panels, earthing, fault current and UPS manufacturer approval.\r\n          <\/span>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <figure class=\"ly-ups47-figure\">\r\n      <div class=\"ly-ups47-figure-frame\">\r\n        <img fetchpriority=\"high\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ups-input-bypass-output-spd-architecture.webp\"\r\n          alt=\"UPS surge protection architecture showing SPD locations on input bypass and output circuits\"\r\n          width=\"1600\"\r\n          height=\"900\"\r\n          loading=\"eager\"\r\n          decoding=\"async\"\r\n          fetchpriority=\"high\"\r\n        >\r\n      <\/div>\r\n\r\n      <figcaption>\r\n        UPS surge protection architecture showing the normal input,\r\n        independent bypass paths and the conditional output-side SPD position.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n    <section\r\n      class=\"ly-ups47-search-bridge\"\r\n      id=\"does-ups-need-surge-protector\"\r\n    >\r\n      <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#does-a-ups-need-a-surge-protector\" >Does a UPS Need a Surge Protector?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#why-a-ups-cannot-replace-a-surge-protection-device\" >Why a UPS Cannot Replace a Surge Protection Device<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#assess-every-path-that-can-energize-the-critical-load\" >Assess Every Path That Can Energize the Critical Load<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#ups-input-spd-selection\" >UPS Input SPD Selection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#does-the-ups-bypass-need-a-separate-spd\" >Does the UPS Bypass Need a Separate SPD?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#is-an-spd-required-on-the-ups-output\" >Is an SPD Required on the UPS Output?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#type-1-type-12-or-type-2-for-a-ups-system\" >Type 1, Type 1+2 or Type 2 for a UPS System?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#earthing-wiring-length-and-backup-protection\" >Earthing, Wiring Length and Backup Protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#remote-alarm-and-maintenance-for-critical-ups-installations\" >Remote Alarm and Maintenance for Critical UPS Installations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#typical-ups-project-configurations\" >Typical UPS Project Configurations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#leeyee-engineering-support-for-ups-spd-projects\" >LEEYEE Engineering Support for UPS SPD Projects<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#ups-spd-oem-and-procurement-checklist\" >UPS SPD OEM and Procurement Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#technical-references\" >Technical References<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/#need-help-selecting-an-spd-for-a-ups-input-or-bypass-panel\" >Need help selecting an SPD for a UPS input or bypass panel?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"does-a-ups-need-a-surge-protector\"><\/span>Does a UPS Need a Surge Protector?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-ups47-search-bridge-lead\">\r\n        Yes, but the term \u201csurge protector\u201d can describe two very different\r\n        products. This guide concerns panel-mounted SPDs for commercial,\r\n        industrial and data center UPS systems\u2014not ordinary plug-in power\r\n        strips.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-bridge-grid\">\r\n        <div class=\"ly-ups47-bridge-card\">\r\n          <strong>Plug-in surge protector<\/strong>\r\n          <p>\r\n            A small socket strip or point-of-use device used close to office\r\n            or consumer equipment. It is not a substitute for coordinated\r\n            protection at the UPS input distribution board.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-bridge-card\">\r\n          <strong>Panel-mounted UPS SPD<\/strong>\r\n          <p>\r\n            A parallel-connected SPD installed at an input, bypass or\r\n            downstream distribution panel. It is selected from system\r\n            voltage, earthing, installation position and fault conditions.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-ups47-warning\">\r\n        <strong>Do not connect equipment blindly.<\/strong>\r\n        Placing a large UPS behind an ordinary surge-protected power strip\r\n        can conflict with the UPS manufacturer's installation requirements.\r\n        Commercial UPS protection should be designed at the distribution\r\n        level.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <nav class=\"ly-ups47-toc\" aria-label=\"Table of contents\">\r\n      <p class=\"ly-ups47-toc-title\">In this guide<\/p>\r\n\r\n      <ol>\r\n        <li>\r\n          <a href=\"#ups-vs-spd\">Why a UPS cannot replace an SPD<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-protection-paths\">Input, bypass and output paths<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-input-spd\">UPS input SPD selection<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-bypass-spd\">Does the bypass need another SPD?<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-output-spd\">When an output SPD is needed<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-spd-type\">Type 1, Type 1+2 or Type 2<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-earthing-coordination\">\r\n            Earthing and backup protection\r\n          <\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-monitoring\">Remote alarm and maintenance<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-project-examples\">\r\n            Typical UPS project configurations\r\n          <\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-engineering-support\">\r\n            LEEYEE project support\r\n          <\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-procurement\">OEM and procurement checklist<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#ups-faq\">Frequently asked questions<\/a>\r\n        <\/li>\r\n      <\/ol>\r\n    <\/nav>\r\n\r\n    <section class=\"ly-ups47-section\" id=\"ups-vs-spd\">\r\n      <h2><span class=\"ez-toc-section\" id=\"why-a-ups-cannot-replace-a-surge-protection-device\"><\/span>Why a UPS Cannot Replace a Surge Protection Device<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-ups47-section-intro\">\r\n        A UPS and an SPD solve different electrical problems. The UPS\r\n        maintains power continuity. The SPD limits transient overvoltage and\r\n        diverts surge current before it damages the UPS or connected load.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-two-col\">\r\n        <div class=\"ly-ups47-card ly-ups47-card-purpose\">\r\n          <h3>The UPS is primarily responsible for<\/h3>\r\n\r\n          <ul>\r\n            <li>Maintaining power during an interruption.<\/li>\r\n            <li>\r\n              Providing time for generator starting or controlled shutdown.\r\n            <\/li>\r\n            <li>\r\n              Correcting specified voltage or frequency disturbances.\r\n            <\/li>\r\n            <li>\r\n              Supplying the critical load through the inverter or bypass.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card ly-ups47-card-risk\">\r\n          <h3>The external SPD is primarily responsible for<\/h3>\r\n\r\n          <ul>\r\n            <li>\r\n              Diverting surge current before it reaches UPS components.\r\n            <\/li>\r\n            <li>\r\n              Limiting the voltage appearing at the UPS terminals.\r\n            <\/li>\r\n            <li>\r\n              Protecting rectifiers, static switches and control circuits.\r\n            <\/li>\r\n            <li>\r\n              Providing replaceable and monitorable distribution protection.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p class=\"ly-ups47-keyline\">\r\n        A UPS keeps the load powered. An SPD keeps transient overvoltage\r\n        within an acceptable level. One function does not replace the other.\r\n      <\/p>\r\n\r\n      <p>\r\n        Eaton states that UPS surge circuitry is generally intended to\r\n        handle the remaining portion of a major surge rather than the entire\r\n        event. It also recommends protection for the UPS input and associated\r\n        bypass circuits, including the manual maintenance bypass.\r\n        <sup><a href=\"#ly-ups47-ref-1\">[1]<\/a><\/sup>\r\n        <sup><a href=\"#ly-ups47-ref-2\">[2]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-warning\">\r\n        <strong>Manufacturer requirements come first.<\/strong>\r\n        Do not select an SPD only from UPS power in kVA. Confirm the UPS\r\n        impulse withstand requirement, input arrangement, bypass arrangement,\r\n        earthing system, available fault current and installation manual.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-ups47-section ly-ups47-section-alt\"\r\n      id=\"ups-protection-paths\"\r\n    >\r\n      <h2><span class=\"ez-toc-section\" id=\"assess-every-path-that-can-energize-the-critical-load\"><\/span>Assess Every Path That Can Energize the Critical Load<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-ups47-section-intro\">\r\n        The SPD position must be based on the project single-line diagram.\r\n        Placing one SPD beside the UPS cabinet does not prove that every\r\n        operating and maintenance path is protected.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-three-col\">\r\n        <div class=\"ly-ups47-card ly-ups47-path-card\">\r\n          <span class=\"ly-ups47-path-number\">01<\/span>\r\n          <h3>Normal rectifier input<\/h3>\r\n          <p>\r\n            Usually the clearest location for a coordinated Type 2 SPD at the\r\n            UPS input distribution board.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card ly-ups47-path-card\">\r\n          <span class=\"ly-ups47-path-number\">02<\/span>\r\n          <h3>Static or maintenance bypass<\/h3>\r\n          <p>\r\n            Must be assessed independently when it originates from another\r\n            switchboard, transformer, ATS, generator or long feeder.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card ly-ups47-path-card\">\r\n          <span class=\"ly-ups47-path-number\">03<\/span>\r\n          <h3>UPS output distribution<\/h3>\r\n          <p>\r\n            Requires conditional assessment for remote panels, long cables,\r\n            external routes, switching loads and inverter-source behaviour.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-ups47-note\">\r\n        <strong>The key design question<\/strong>\r\n        When the UPS changes from normal operation to static bypass or\r\n        maintenance bypass, is every possible supply path still protected by\r\n        a correctly selected and correctly connected SPD?\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-ups47-section\" id=\"ups-input-spd\">\r\n      <h2><span class=\"ez-toc-section\" id=\"ups-input-spd-selection\"><\/span>UPS Input SPD Selection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The normal input is usually the primary distribution-level SPD\r\n        position. The SPD should limit transient overvoltage before it reaches\r\n        the rectifier, charger, static switch, filters and electronic control\r\n        circuits.\r\n      <\/p>\r\n\r\n      <p>\r\n        A Type 2 SPD is common at the UPS input distribution board,\r\n        particularly where coordinated Type 1 or Type 1+2 protection already\r\n        exists at the building origin. However, \u201cType 2, 40 kA for UPS\u201d is not\r\n        a complete specification.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-table-wrap\">\r\n        <table class=\"ly-ups47-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Selection parameter<\/th>\r\n              <th>What the engineer or buyer must confirm<\/th>\r\n              <th>Why it matters<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <td>System voltage<\/td>\r\n              <td>\r\n                Confirm phase-to-phase and phase-to-neutral voltage at the\r\n                installation point.\r\n              <\/td>\r\n              <td>\r\n                UPS nameplate voltage alone may not define every required SPD\r\n                protection mode.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Earthing system<\/td>\r\n              <td>\r\n                Confirm TN-S, TN-C, TT, IT or another project arrangement.\r\n              <\/td>\r\n              <td>\r\n                It affects Uc, the number of poles and the required protection\r\n                modes.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>SPD type<\/td>\r\n              <td>\r\n                Confirm Type 1, Type 1+2, Type 2 or a coordinated combination.\r\n              <\/td>\r\n              <td>\r\n                SPD type depends on installation position and exposure\u2014not\r\n                UPS kVA.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Uc<\/td>\r\n              <td>\r\n                Select for the actual voltage, earthing arrangement and\r\n                possible temporary overvoltage.\r\n              <\/td>\r\n              <td>\r\n                An unsuitable Uc can cause premature failure or weak\r\n                protection.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Up<\/td>\r\n              <td>\r\n                Coordinate the voltage protection level with the UPS\r\n                withstand requirement and installation lead voltage.\r\n              <\/td>\r\n              <td>\r\n                Catalogue Up is not the complete voltage appearing at the UPS\r\n                terminals.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>In and Imax<\/td>\r\n              <td>\r\n                Specify nominal and maximum discharge current from the\r\n                installation exposure and protection plan.\r\n              <\/td>\r\n              <td>\r\n                Do not select kA rating from UPS size alone.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Iimp<\/td>\r\n              <td>\r\n                Confirm whether the installation position requires\r\n                lightning-current capability.\r\n              <\/td>\r\n              <td>\r\n                Iimp is relevant where Type 1 duty or partial lightning current\r\n                is expected.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Poles and modes<\/td>\r\n              <td>\r\n                Confirm 1P+N, 2P, 3P, 3P+N, 4P, 3+1 or 4+0 from the actual\r\n                system.\r\n              <\/td>\r\n              <td>\r\n                The configuration must match neutral and PE conditions.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Isccr<\/td>\r\n              <td>\r\n                Compare the SPD short-circuit rating with prospective\r\n                short-circuit current at the panel.\r\n              <\/td>\r\n              <td>\r\n                The SPD arrangement must remain safe under the available fault\r\n                level.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Backup protection<\/td>\r\n              <td>\r\n                Confirm the fuse or circuit-breaker type and rating permitted\r\n                by the SPD manufacturer.\r\n              <\/td>\r\n              <td>\r\n                The UPS feeder breaker is not automatically valid SPD backup\r\n                protection.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Monitoring<\/td>\r\n              <td>\r\n                Confirm visual indication, remote dry contact and BMS, SCADA\r\n                or PLC requirements.\r\n              <\/td>\r\n              <td>\r\n                A failed SPD in an unmanned UPS room must not remain\r\n                unnoticed.\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p>\r\n        Schneider Electric provides a manufacturer-specific example for\r\n        selected Galaxy UPS systems. Its documentation specifies an upstream\r\n        Type 2 SPD, Up below 2.5 kV, short-circuit capability coordinated with\r\n        the installation fault level, poles matched to the earthing system\r\n        and operational status monitoring.\r\n        <sup><a href=\"#ly-ups47-ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-critical\">\r\n        <strong>Do not copy one UPS manufacturer's values universally.<\/strong>\r\n        The Schneider requirements demonstrate the parameters that a UPS\r\n        manufacturer may define. They are not universal ratings for every\r\n        UPS brand, voltage or installation.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-ups47-section ly-ups47-section-alt\"\r\n      id=\"ups-bypass-spd\"\r\n    >\r\n      <h2><span class=\"ez-toc-section\" id=\"does-the-ups-bypass-need-a-separate-spd\"><\/span>Does the UPS Bypass Need a Separate SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-ups47-section-intro\">\r\n        A bypass circuit can connect the incoming AC source directly to the\r\n        critical load while the normal rectifier and inverter path is\r\n        unavailable or intentionally isolated.\r\n      <\/p>\r\n\r\n      <figure class=\"ly-ups47-figure\">\r\n        <div class=\"ly-ups47-figure-frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/single-input-vs-dual-input-ups-spd-protection.webp\"\r\n            alt=\"Comparison of SPD protection for single-input and dual-input UPS systems\"\r\n            width=\"1600\"\r\n            height=\"900\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          A single-input UPS may share one protected upstream source, while a\r\n          dual-input UPS can introduce an independent bypass path that\r\n          requires separate SPD assessment.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <p class=\"ly-ups47-keyline\">\r\n        Treat an electrically independent bypass supply as a separate\r\n        incoming power path until the single-line diagram proves that it is\r\n        already inside the same coordinated protection zone.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-decision\">\r\n        <div class=\"ly-ups47-decision-item\">\r\n          <strong>\r\n            Do the rectifier input and bypass input come from the same\r\n            protected bus?\r\n          <\/strong>\r\n          <p>\r\n            One coordinated upstream SPD may protect both when the branches\r\n            originate from the same nearby switchboard and connection routing\r\n            remains short.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-decision-item\">\r\n          <strong>\r\n            Does the bypass come from another transformer, ATS, generator or\r\n            switchboard?\r\n          <\/strong>\r\n          <p>\r\n            A separate source creates a separate possible surge path. It\r\n            requires independent assessment and may require a dedicated SPD.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-decision-item\">\r\n          <strong>Is there an external maintenance bypass cabinet?<\/strong>\r\n          <p>\r\n            Confirm that surge protection remains effective while the UPS and\r\n            normal input panel are isolated for service.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-decision-item\">\r\n          <strong>\r\n            Does the bypass feeder cross a long distance or lightning\r\n            protection zone?\r\n          <\/strong>\r\n          <p>\r\n            A long feeder, separate building or exposed route can justify\r\n            protection at the receiving panel.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-decision-item\">\r\n          <strong>\r\n            Can the critical load receive utility power directly during\r\n            bypass?\r\n          <\/strong>\r\n          <p>\r\n            If yes, the load cannot rely on the rectifier and inverter path\r\n            during that operating mode.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-ups47-verdict-grid\">\r\n        <div class=\"ly-ups47-verdict ly-ups47-verdict-yes\">\r\n          <span class=\"ly-ups47-verdict-label\">Separate SPD likely<\/span>\r\n          <strong>Independent dual-input UPS<\/strong>\r\n          <p>\r\n            Protect the rectifier supply and bypass supply according to their\r\n            separate source and panel conditions.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-verdict ly-ups47-verdict-check\">\r\n          <span class=\"ly-ups47-verdict-label\">Verify coverage<\/span>\r\n          <strong>Common input and bypass bus<\/strong>\r\n          <p>\r\n            One SPD may be sufficient only when both branches remain inside\r\n            the effective protected zone.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-verdict ly-ups47-verdict-yes\">\r\n          <span class=\"ly-ups47-verdict-label\">\r\n            Design for maintenance\r\n          <\/span>\r\n          <strong>External maintenance bypass<\/strong>\r\n          <p>\r\n            The protection arrangement should remain active while the UPS is\r\n            isolated and serviced.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p>\r\n        Eaton's UPS guidance recommends surge protection for both the UPS\r\n        input circuit and associated bypass circuits, including the manual\r\n        maintenance bypass circuit.\r\n        <sup><a href=\"#ly-ups47-ref-1\">[1]<\/a><\/sup>\r\n        <sup><a href=\"#ly-ups47-ref-2\">[2]<\/a><\/sup>\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-ups47-section\" id=\"ups-output-spd\">\r\n      <h2><span class=\"ez-toc-section\" id=\"is-an-spd-required-on-the-ups-output\"><\/span>Is an SPD Required on the UPS Output?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        An output SPD is not an automatic requirement for every UPS. The\r\n        decision depends on the UPS output source, bypass arrangement,\r\n        downstream cable route, receiving panel, connected loads and fault\r\n        behaviour.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-standard-alert\">\r\n        <strong>Important IEC consideration for UPS inverter outputs<\/strong>\r\n        IEC 61643-11:2025 bases its SPD test requirements on connection to an\r\n        AC source with a linear voltage-current characteristic. When an SPD\r\n        is connected to a different type of source, the expected\r\n        short-circuit current, temporary overvoltage stresses and other\r\n        system fault conditions require careful consideration. A\r\n        current-limited UPS inverter output may behave differently from a\r\n        conventional utility or transformer source.\r\n        <sup><a href=\"#ly-ups47-ref-4\">[4]<\/a><\/sup>\r\n      <\/div>\r\n\r\n      <p>Before installing an SPD directly on the UPS output, confirm:<\/p>\r\n\r\n      <ul>\r\n        <li>The UPS manufacturer's approval or installation requirements.<\/li>\r\n        <li>The output short-circuit and current-limiting behaviour.<\/li>\r\n        <li>The output earthing and neutral arrangement.<\/li>\r\n        <li>The possible TOV and abnormal operating conditions.<\/li>\r\n        <li>The SPD disconnection and backup-protection behaviour.<\/li>\r\n        <li>Whether protection is better located at a receiving panel.<\/li>\r\n      <\/ul>\r\n\r\n      <div class=\"ly-ups47-table-wrap\">\r\n        <table class=\"ly-ups47-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Output-side condition<\/th>\r\n              <th>Engineering direction<\/th>\r\n              <th>Reason<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <td>Nearby protected PDU in the same room<\/td>\r\n              <td>An additional output SPD may not be necessary.<\/td>\r\n              <td>\r\n                The output remains inside a compact coordinated protection\r\n                zone.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Long feeder to a remote distribution board<\/td>\r\n              <td>Assess an SPD at the receiving panel.<\/td>\r\n              <td>\r\n                A long conductor can introduce additional transient exposure\r\n                and lead voltage.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Feeder enters another building or external area<\/td>\r\n              <td>Additional protection is commonly justified.<\/td>\r\n              <td>\r\n                The route may cross a lightning protection zone or external\r\n                exposure point.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Bypass connects utility directly to the output bus<\/td>\r\n              <td>\r\n                Verify protection of the downstream load during bypass.\r\n              <\/td>\r\n              <td>\r\n                The inverter path may no longer separate the load from the\r\n                incoming source.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>Motors, contactors or switching loads share the output<\/td>\r\n              <td>Assess internally generated switching transients.<\/td>\r\n              <td>\r\n                Not every transient originates from the utility side.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>IT output or separately derived output system<\/td>\r\n              <td>\r\n                Do not select a standard output SPD without topology review.\r\n              <\/td>\r\n              <td>\r\n                Uc and protection modes must match the output earthing\r\n                arrangement.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td>UPS manufacturer restricts output-side devices<\/td>\r\n              <td>Follow the UPS manufacturer's instructions.<\/td>\r\n              <td>\r\n                An unsuitable SPD can affect monitoring, protection or fault\r\n                behaviour.\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"ly-ups47-note\">\r\n        <strong>Practical rule<\/strong>\r\n        Add an output SPD because the downstream architecture creates a\r\n        defined surge risk\u2014not simply because spare DIN-rail space is\r\n        available beside the output breaker.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-ups47-section ly-ups47-section-alt\"\r\n      id=\"ups-spd-type\"\r\n    >\r\n      <h2><span class=\"ez-toc-section\" id=\"type-1-type-12-or-type-2-for-a-ups-system\"><\/span>Type 1, Type 1+2 or Type 2 for a UPS System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-ups47-section-intro\">\r\n        SPD type is selected from installation position, lightning exposure\r\n        and coordination with upstream and downstream protection. It is not\r\n        determined by UPS capacity alone.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-two-col\">\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Type 1 SPD<\/h3>\r\n          <p>\r\n            Used where partial lightning current can enter the low-voltage\r\n            installation, commonly at the service entrance or lightning\r\n            protection zone boundary.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Type 1+2 SPD<\/h3>\r\n          <p>\r\n            Combines lightning-current and voltage-limiting duties. It can be\r\n            appropriate where a UPS feeder begins near the installation\r\n            origin.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Type 2 SPD<\/h3>\r\n          <p>\r\n            The common distribution-level choice for UPS input, bypass and\r\n            downstream panels when Type 1 protection is already coordinated\r\n            upstream.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Type 3 SPD<\/h3>\r\n          <p>\r\n            A coordinated fine-protection stage installed close to sensitive\r\n            terminal equipment. It does not replace distribution-level Type 1\r\n            or Type 2 protection.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p>\r\n        IEC 61643-12:2020 addresses SPD selection, operation, location and\r\n        coordination for AC low-voltage power circuits.\r\n        <sup><a href=\"#ly-ups47-ref-5\">[5]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-related\">\r\n        <a href=\"\/spd-selection-guide\/\">\r\n          SPD Selection Guide for Distribution and Project Applications\r\n        <\/a>\r\n\r\n        <a href=\"\/spd-iimp-12-5ka-vs-25ka\/\">\r\n          SPD Iimp 12.5 kA vs 25 kA Selection\r\n        <\/a>\r\n\r\n        <a href=\"\/3pn-vs-4p-spd\/\">\r\n          3P+N SPD vs 4P SPD Selection\r\n        <\/a>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-ups47-section\" id=\"ups-earthing-coordination\">\r\n      <h2><span class=\"ez-toc-section\" id=\"earthing-wiring-length-and-backup-protection\"><\/span>Earthing, Wiring Length and Backup Protection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A correctly rated SPD can still provide poor protection when its\r\n        wiring configuration is wrong. UPS projects may involve separate\r\n        neutrals, switched neutrals, bypass supplies, transformers, generators\r\n        or IT systems.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-two-col\">\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Earthing and protection modes<\/h3>\r\n\r\n          <ul>\r\n            <li>Confirm TN-S, TN-C, TT or IT.<\/li>\r\n            <li>Confirm whether neutral is switched by the ATS or bypass.<\/li>\r\n            <li>\r\n              Select phase-to-neutral, phase-to-PE and neutral-to-PE modes\r\n              correctly.\r\n            <\/li>\r\n            <li>\r\n              Do not assume 3P+N, 4P, 3+1 and 4+0 are interchangeable.\r\n            <\/li>\r\n            <li>\r\n              Confirm input and output neutral arrangements separately.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Short-circuit and backup coordination<\/h3>\r\n\r\n          <ul>\r\n            <li>\r\n              Obtain prospective short-circuit current at the SPD position.\r\n            <\/li>\r\n            <li>\r\n              Verify the SPD Isccr and permitted backup protection.\r\n            <\/li>\r\n            <li>\r\n              Use the fuse or breaker specified by the SPD manufacturer.\r\n            <\/li>\r\n            <li>\r\n              Check coordination with upstream and feeder protection.\r\n            <\/li>\r\n            <li>\r\n              Do not assume the UPS feeder breaker automatically protects the\r\n              SPD.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <h3>Keep SPD connections short and direct<\/h3>\r\n\r\n      <p>\r\n        The voltage reaching the UPS includes the SPD voltage protection\r\n        level plus the additional voltage developed across the connecting\r\n        conductors. Long, looped or poorly routed conductors reduce the\r\n        benefit of a low catalogue Up.\r\n      <\/p>\r\n\r\n      <p>\r\n        Install the SPD close to the protected bus, use direct conductors and\r\n        avoid unnecessary loops. For detailed installation guidance, review\r\n        the\r\n        <a href=\"\/spd-cable-length-0-5m\/\">\r\n          SPD 0.5 m connection-length guide\r\n        <\/a>,\r\n        <a href=\"\/spd-grounding-resistance\/\">\r\n          SPD grounding guide\r\n        <\/a>,\r\n        <a href=\"\/tn-s-system-spd-wiring\/\">\r\n          TN-S SPD wiring guide\r\n        <\/a>\r\n        and\r\n        <a href=\"\/tt-system-spd\/\">\r\n          TT-system SPD guide\r\n        <\/a>.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-warning\">\r\n        <strong>An isolated earth rod is not a shortcut.<\/strong>\r\n        The SPD must be connected to the project's protective bonding and\r\n        equipotential system. A poorly bonded separate earth can increase the\r\n        voltage difference between connected equipment.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-ups47-section ly-ups47-section-alt\"\r\n      id=\"ups-monitoring\"\r\n    >\r\n      <h2><span class=\"ez-toc-section\" id=\"remote-alarm-and-maintenance-for-critical-ups-installations\"><\/span>Remote Alarm and Maintenance for Critical UPS Installations<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A visual indicator may be enough for a small panel inspected\r\n        regularly. It is often insufficient for a data center, industrial UPS\r\n        room, telecom site or unmanned facility.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-two-col\">\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Recommended monitoring features<\/h3>\r\n\r\n          <ul>\r\n            <li>Local green and red status indication.<\/li>\r\n            <li>Voltage-free remote signalling contact.<\/li>\r\n            <li>BMS, SCADA or PLC alarm integration.<\/li>\r\n            <li>Clear normal and failure contact logic.<\/li>\r\n            <li>\r\n              Identification of which input, bypass or output SPD has failed.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-card\">\r\n          <h3>Recommended maintenance features<\/h3>\r\n\r\n          <ul>\r\n            <li>Pluggable and replaceable protection modules.<\/li>\r\n            <li>Finger-safe cartridge replacement.<\/li>\r\n            <li>Spare modules available for the project lifetime.<\/li>\r\n            <li>Inspection after major surge events.<\/li>\r\n            <li>Recorded installation and replacement history.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p>\r\n        Selected Schneider UPS documentation includes operational status\r\n        indication among its upstream SPD requirements.\r\n        <sup><a href=\"#ly-ups47-ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <p>\r\n        For NO, NC and COM contact integration, see the\r\n        <a href=\"\/spd-remote-alarm-plc\/\">\r\n          SPD remote alarm and PLC guide\r\n        <\/a>.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-ups47-section\" id=\"ups-project-examples\">\r\n      <h2><span class=\"ez-toc-section\" id=\"typical-ups-project-configurations\"><\/span>Typical UPS Project Configurations<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-ups47-section-intro\">\r\n        These examples are starting points for design review. The final\r\n        protection arrangement must follow the actual project single-line\r\n        diagram and UPS manufacturer documentation.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-scenario-grid\">\r\n        <div class=\"ly-ups47-scenario\">\r\n          <span class=\"ly-ups47-scenario-number\">01<\/span>\r\n          <h3>Single-input online UPS<\/h3>\r\n\r\n          <p>\r\n            The rectifier and bypass are supplied from one nearby protected\r\n            panel.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>Typical direction:<\/strong>\r\n            A coordinated Type 2 SPD may cover both branches when conductor\r\n            routing remains short and common.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-scenario\">\r\n          <span class=\"ly-ups47-scenario-number\">02<\/span>\r\n          <h3>Dual-input data center UPS<\/h3>\r\n\r\n          <p>\r\n            The rectifier input and bypass input originate from different\r\n            switchboards, ATS systems or transformers.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>Typical direction:<\/strong>\r\n            Assess each source as an independent incoming path.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-scenario\">\r\n          <span class=\"ly-ups47-scenario-number\">03<\/span>\r\n          <h3>UPS with external maintenance bypass<\/h3>\r\n\r\n          <p>\r\n            The bypass cabinet energizes the critical load while the UPS is\r\n            isolated.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>Typical direction:<\/strong>\r\n            Position protection so it remains effective during maintenance\r\n            bypass.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-scenario\">\r\n          <span class=\"ly-ups47-scenario-number\">04<\/span>\r\n          <h3>UPS feeding a remote PDU<\/h3>\r\n\r\n          <p>\r\n            The output feeder is long or crosses an external area or another\r\n            protection zone.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>Typical direction:<\/strong>\r\n            Assess protection at the receiving panel after confirming UPS\r\n            output compatibility.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-scenario\">\r\n          <span class=\"ly-ups47-scenario-number\">05<\/span>\r\n          <h3>Industrial UPS with generator and ATS<\/h3>\r\n\r\n          <p>\r\n            Normal and emergency sources can introduce utility, generator and\r\n            transfer switching conditions.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>Typical direction:<\/strong>\r\n            Review coordination at the service entrance, ATS, UPS input and\r\n            bypass source.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-scenario\">\r\n          <span class=\"ly-ups47-scenario-number\">06<\/span>\r\n          <h3>Parallel or redundant UPS system<\/h3>\r\n\r\n          <p>\r\n            Multiple UPS modules share common input, bypass or output buses.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>Typical direction:<\/strong>\r\n            Confirm that no operating or maintenance configuration creates an\r\n            unprotected route.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-ups47-section ly-ups47-section-alt\"\r\n      id=\"ups-engineering-support\"\r\n    >\r\n      <h2><span class=\"ez-toc-section\" id=\"leeyee-engineering-support-for-ups-spd-projects\"><\/span>LEEYEE Engineering Support for UPS SPD Projects<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-ups47-section-intro\">\r\n        Final model confirmation should be based on the project electrical\r\n        system\u2014not only a requested kA value. LEEYEE can review the input,\r\n        bypass and downstream panel requirements before an OEM or bulk order\r\n        is confirmed.\r\n      <\/p>\r\n\r\n      <div class=\"ly-ups47-proof-grid\">\r\n        <div class=\"ly-ups47-proof\">\r\n          <span class=\"ly-ups47-proof-icon\">01<\/span>\r\n          <h3>Product parameter review<\/h3>\r\n          <p>\r\n            Review Type, Uc, Up, discharge-current rating, pole configuration,\r\n            remote contact and replaceable module requirements.\r\n          <\/p>\r\n          <p>\r\n            <a\r\n              class=\"ly-ups47-proof-link\"\r\n              href=\"\/ly1-c40-surge-protection-device-product\/\"\r\n            >\r\n              View AC Type 2 SPD example\r\n            <\/a>\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-proof\">\r\n          <span class=\"ly-ups47-proof-icon\">02<\/span>\r\n          <h3>Certificate verification<\/h3>\r\n          <p>\r\n            Confirm available certificate scope and whether the required model\r\n            and voltage are covered before tender or bulk-order approval.\r\n          <\/p>\r\n          <p>\r\n            <a\r\n              class=\"ly-ups47-proof-link\"\r\n              href=\"\/patents-certificates\/\"\r\n            >\r\n              Review certificates\r\n            <\/a>\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-proof\">\r\n          <span class=\"ly-ups47-proof-icon\">03<\/span>\r\n          <h3>Technical documentation<\/h3>\r\n          <p>\r\n            Check datasheets, wiring information, dimensions and supporting\r\n            project documents during technical approval.\r\n          <\/p>\r\n          <p>\r\n            <a\r\n              class=\"ly-ups47-proof-link\"\r\n              href=\"\/resources\/technical-downloads\/\"\r\n            >\r\n              Open technical downloads\r\n            <\/a>\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-ups47-note\">\r\n        <strong>Information required for final confirmation<\/strong>\r\n        Send a marked single-line diagram showing the normal input, bypass\r\n        input, maintenance bypass, output bus, system voltage, earthing\r\n        arrangement and available short-circuit current.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-ups47-section\" id=\"ups-procurement\">\r\n      <h2><span class=\"ez-toc-section\" id=\"ups-spd-oem-and-procurement-checklist\"><\/span>UPS SPD OEM and Procurement Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A request containing only \u201cType 2, 40 kA for UPS\u201d is not enough for\r\n        reliable model selection. Confirm the following information before\r\n        requesting a final quotation.\r\n      <\/p>\r\n\r\n      <figure class=\"ly-ups47-figure\">\r\n        <div class=\"ly-ups47-figure-frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ups-spd-oem-procurement-checklist.webp\"\r\n            alt=\"UPS SPD OEM procurement checklist for input bypass and output protection\"\r\n            width=\"1600\"\r\n            height=\"900\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          UPS SPD procurement checklist covering system topology, electrical\r\n          parameters, monitoring functions, certification and OEM order\r\n          requirements.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <ul class=\"ly-ups47-checklist\">\r\n        <li>UPS brand, model, topology and rated power.<\/li>\r\n        <li>Single-input or dual-input configuration.<\/li>\r\n        <li>Static bypass and maintenance bypass arrangement.<\/li>\r\n        <li>Single-line diagram showing all power sources.<\/li>\r\n        <li>Phase-to-phase and phase-to-neutral voltage.<\/li>\r\n        <li>System frequency and permissible voltage range.<\/li>\r\n        <li>TN-S, TN-C, TT, IT or project earthing system.<\/li>\r\n        <li>Input, bypass, output or receiving-panel SPD position.<\/li>\r\n        <li>Required Type 1, Type 1+2 or Type 2 classification.<\/li>\r\n        <li>Required Uc, Up, In, Imax and Iimp where applicable.<\/li>\r\n        <li>Number of poles and protection modes.<\/li>\r\n        <li>Prospective short-circuit current at each position.<\/li>\r\n        <li>Required backup fuse or circuit breaker.<\/li>\r\n        <li>Connection length and panel layout.<\/li>\r\n        <li>Visual indicator and remote dry contact.<\/li>\r\n        <li>Pluggable module and spare-cartridge requirement.<\/li>\r\n        <li>IEC, UL, local certification or tender requirement.<\/li>\r\n        <li>OEM label, packaging, quantity and delivery schedule.<\/li>\r\n      <\/ul>\r\n\r\n      <h3>Common UPS SPD Specification Mistakes<\/h3>\r\n\r\n      <div class=\"ly-ups47-mistakes\">\r\n        <div class=\"ly-ups47-mistake\">\r\n          <strong>\u201cThe UPS already has surge protection.\u201d<\/strong>\r\n          <span>\r\n            Built-in protection does not prove that the UPS replaces the\r\n            distribution-level SPD system.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-mistake\">\r\n          <strong>Protecting only the rectifier input<\/strong>\r\n          <span>\r\n            An independent static or maintenance bypass can still provide a\r\n            direct path to the load.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-mistake\">\r\n          <strong>Selecting by kA alone<\/strong>\r\n          <span>\r\n            Uc, Up, earthing, Isccr, backup protection and connection layout\r\n            are also essential.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-mistake\">\r\n          <strong>Copying 275 V or 385 V without checking<\/strong>\r\n          <span>\r\n            Uc must match the actual voltage, earthing system and possible\r\n            temporary overvoltage.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-mistake\">\r\n          <strong>Automatically installing an output SPD<\/strong>\r\n          <span>\r\n            UPS output source behaviour and manufacturer compatibility must\r\n            be checked first.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-mistake\">\r\n          <strong>Ignoring remote alarm contacts<\/strong>\r\n          <span>\r\n            A failed SPD in an unmanned critical-power room may remain\r\n            undetected until another surge occurs.\r\n          <\/span>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-ups47-section ly-ups47-section-alt\"\r\n      id=\"ups-faq\"\r\n    >\r\n      <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-ups47-faq\">\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>\r\n            Does a UPS still need an external surge protection device?\r\n          <\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              Usually yes for commercial and industrial systems. A UPS\r\n              provides backup power and specified power conditioning, while\r\n              an external panel-mounted SPD limits transient overvoltage\r\n              before it reaches the UPS and critical load.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>\r\n            Where should the SPD be installed before a UPS?\r\n          <\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              A Type 2 SPD is commonly installed at the UPS input\r\n              distribution board and coordinated with Type 1 or Type 1+2\r\n              protection at the installation origin.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>Does a double-conversion UPS need an SPD?<\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              Yes, double conversion does not remove the need to protect the\r\n              rectifier, control electronics and bypass circuit. During bypass\r\n              operation, the load may be connected directly to the incoming\r\n              AC source.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>Does a UPS bypass need a separate SPD?<\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              It may. A dedicated SPD is more likely when the bypass originates\r\n              from another switchboard, transformer, ATS, generator or long\r\n              feeder. A common nearby protected bus may allow one coordinated\r\n              SPD after engineering verification.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>Is an SPD required on the UPS output?<\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              Not in every installation. Assess an output or receiving-panel\r\n              SPD when the feeder is long, crosses a protection-zone boundary,\r\n              supplies switching loads or remains exposed during bypass.\r\n              Confirm UPS inverter-source compatibility first.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>\r\n            Is Type 2 SPD normally used for a UPS input?\r\n          <\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              Yes, Type 2 is common at UPS input and bypass distribution\r\n              panels when lightning-current protection is already coordinated\r\n              upstream.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>\r\n            Can an SPD be selected only from the UPS kVA rating?\r\n          <\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              No. UPS kVA does not determine Uc, Up, pole configuration,\r\n              discharge-current rating or short-circuit coordination. These\r\n              parameters come from the electrical system.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details class=\"ly-ups47-faq-item\">\r\n          <summary>\r\n            Should a UPS-room SPD include a remote alarm contact?\r\n          <\/summary>\r\n\r\n          <div class=\"ly-ups47-faq-answer\">\r\n            <p>\r\n              It is strongly recommended for data centers, industrial control\r\n              rooms, telecom sites and other critical or unmanned facilities.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-ups47-section\"\r\n      aria-labelledby=\"ly-ups47-references-title\"\r\n    >\r\n      <div class=\"ly-ups47-review\">\r\n        <div>\r\n          <strong>Technical review<\/strong>\r\n          <span>LEEYEE SPD Engineering Team<\/span>\r\n        <\/div>\r\n\r\n        <div>\r\n          <strong>Last updated<\/strong>\r\n          <span>July 20, 2026<\/span>\r\n        <\/div>\r\n\r\n        <div>\r\n          <strong>Page scope<\/strong>\r\n          <span>Commercial and industrial UPS power circuits<\/span>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <h2 id=\"ly-ups47-references-title\"><span class=\"ez-toc-section\" id=\"technical-references\"><\/span>Technical References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <ol class=\"ly-ups47-sources\">\r\n        <li id=\"ly-ups47-ref-1\">\r\n          Eaton, \u201cUPS Systems and Surge Protection,\u201d Publication\r\n          AP158013EN, February 2024.\r\n          <a\r\n            href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/backup-power-ups-surge-it-power-distribution\/surge\/pspd\/eaton-ups-and-surge-protection-ap158013en.pdf\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View source\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ly-ups47-ref-2\">\r\n          Eaton, \u201cUninterruptible Power Supplies and the Need for Secondary\r\n          Surge Suppression,\u201d Publication TD01005004E, February 2024.\r\n          <a\r\n            href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/backup-power-ups-surge-it-power-distribution\/surge\/pspd\/eaton-ups-and-secondary-surge-td01005004e.pdf\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View source\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ly-ups47-ref-3\">\r\n          Schneider Electric, Galaxy VS UPS installation specifications,\r\n          Surge Protection Device requirements.\r\n          <a\r\n            href=\"https:\/\/productinfo.se.com\/galaxyvs_iec\/990-91111-master-galaxy-vs-ups-for-external-batteries-installation\/990-91111D%20Galaxy%20VS%20UPS%20for%20External%20Batteries%20Installation\/English\/990-91111%20Installation%20Galaxy%20VS%2010-100%20kW_0000170131.xml\/%24\/Specifications400VHEADER_0000204076\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View source\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ly-ups47-ref-4\">\r\n          IEC 61643-11:2025, Low-voltage surge protective devices connected\r\n          to AC low-voltage power systems\u2014requirements and test methods.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View source\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ly-ups47-ref-5\">\r\n          IEC 61643-12:2020, Selection, operation, location and coordination\r\n          principles for SPDs connected to AC low-voltage power systems.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/32531\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View source\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ly-ups47-ref-6\">\r\n          IEC 61643-01:2024, Common requirements for low-voltage surge\r\n          protective devices.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View source\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ly-ups47-ref-7\">\r\n          IEEE 1100, Recommended Practice for Powering and Grounding\r\n          Electronic Equipment.\r\n          <a\r\n            href=\"https:\/\/standards.ieee.org\/ieee\/1100\/3055\/\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View source\r\n          <\/a>\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <p class=\"ly-ups47-footnote\">\r\n        Standards, UPS manufacturer instructions and national wiring rules\r\n        may change. Confirm the edition and requirements applicable to the\r\n        destination market before final product selection.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-ups47-cta\" aria-label=\"UPS SPD project review\">\r\n      <div class=\"ly-ups47-cta-inner\">\r\n\r\n        <div class=\"ly-ups47-cta-content\">\r\n          <span class=\"ly-ups47-cta-label\">\r\n            UPS SPD Project Support\r\n          <\/span>\r\n\r\n          <h2><span class=\"ez-toc-section\" id=\"need-help-selecting-an-spd-for-a-ups-input-or-bypass-panel\"><\/span>\r\n            Need help selecting an SPD for a UPS input or bypass panel?\r\n          <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p>\r\n            Send the UPS single-line diagram, system voltage, earthing\r\n            arrangement, installation position and available fault current.\r\n            LEEYEE can review the required poles, Uc, Up, discharge-current\r\n            rating, backup protection, remote contact and OEM requirements.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-ups47-cta-action\">\r\n          <a\r\n            class=\"ly-ups47-btn leeyee-site-popup-btn\"\r\n            href=\"javascript:void(0);\"\r\n            aria-label=\"Send UPS SPD project requirements\"\r\n          >\r\n            <span>Send Project Requirements<\/span>\r\n          <\/a>\r\n        <\/div>\r\n\r\n      <\/div>\r\n    <\/section>\r\n\r\n  <\/div>\r\n<\/article>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"TechArticle\",\r\n  \"mainEntityOfPage\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/www.cnspd.com\/ups-surge-protection-device\/\"\r\n  },\r\n  \"headline\": \"UPS Surge Protection Device: Input, Bypass and Output Selection Guide\",\r\n  \"description\": \"Does a UPS still need an SPD? Learn how to protect UPS input, static bypass, maintenance bypass and output circuits, including Type 2, Uc, Up and Isccr.\",\r\n  \"image\": [\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ups-input-bypass-output-spd-architecture.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/single-input-vs-dual-input-ups-spd-protection.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ups-spd-oem-procurement-checklist.webp\"\r\n  ],\r\n  \"datePublished\": \"2026-07-20\",\r\n  \"dateModified\": \"2026-07-20\",\r\n  \"author\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE SPD Engineering Team\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"publisher\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"about\": [\r\n    {\r\n      \"@type\": \"Thing\",\r\n      \"name\": \"UPS surge protection device\"\r\n    },\r\n    {\r\n      \"@type\": \"Thing\",\r\n      \"name\": \"UPS bypass surge protection\"\r\n    },\r\n    {\r\n      \"@type\": \"Thing\",\r\n      \"name\": \"Type 2 surge protective device\"\r\n    }\r\n  ],\r\n  \"inLanguage\": \"en\"\r\n}\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Does a UPS still need an external surge protection device?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Usually yes for commercial and industrial systems. A UPS provides backup power and specified power conditioning, while an external panel-mounted SPD limits transient overvoltage before it reaches the UPS and critical load.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Where should the SPD be installed before a UPS?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"A Type 2 SPD is commonly installed at the UPS input distribution board and coordinated with Type 1 or Type 1+2 protection at the installation origin.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Does a double-conversion UPS need an SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Yes. Double conversion does not remove the need to protect the rectifier, control electronics and bypass circuit. During bypass operation, the load may be connected directly to the incoming AC source.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Does a UPS bypass need a separate SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"It may. A dedicated SPD is more likely when the bypass originates from another switchboard, transformer, ATS, generator or long feeder. A common nearby protected bus may allow one coordinated SPD after engineering verification.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is an SPD required on the UPS output?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Not in every installation. Assess an output or receiving-panel SPD when the feeder is long, crosses a protection-zone boundary, supplies switching loads or remains exposed during bypass. Confirm UPS inverter-source compatibility first.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is Type 2 SPD normally used for a UPS input?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Yes. Type 2 is common at UPS input and bypass distribution panels when lightning-current protection is already coordinated upstream.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can an SPD be selected only from the UPS kVA rating?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. UPS kVA does not determine Uc, Up, pole configuration, discharge-current rating or short-circuit coordination. These parameters come from the electrical system.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Should a UPS-room SPD include a remote alarm contact?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"It is strongly recommended for data centers, industrial control rooms, telecom sites and other critical or unmanned facilities.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\r\n\r\n<script>\r\n(function () {\r\n  \"use strict\";\r\n\r\n  document.addEventListener(\"click\", function (event) {\r\n    var button = event.target.closest(\".leeyee-site-popup-btn\");\r\n\r\n    if (!button) {\r\n      return;\r\n    }\r\n\r\n    event.preventDefault();\r\n\r\n    var popupTrigger = document.querySelector(\".w-popup.ush_popup_1\");\r\n\r\n    if (popupTrigger) {\r\n      popupTrigger.click();\r\n      return;\r\n    }\r\n\r\n    window.open(\"\/contact\/\", \"_blank\", \"noopener\");\r\n  });\r\n})();\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>UPS Power Distribution and SPD Engineering Guide A UPS surge protection device is still required in many commercial and industrial UPS systems because the UPS itself does not replace coordinated distribution-level surge protection. The normal input, static bypass, maintenance bypass and output distribution must be assessed as separate electrical paths. Quick engineering answer Protect the&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-30209","post","type-post","status-publish","format-standard","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>UPS Surge Protection Device: Input, Bypass &amp; Output Guide<\/title>\n<meta name=\"description\" content=\"Does a UPS still need an SPD? Learn how to protect UPS input, static bypass, maintenance bypass and output circuits, including Type 2, Uc, Up and Isccr.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UPS Surge Protection Device: Input, Bypass &amp; Output Guide\" \/>\n<meta property=\"og:description\" content=\"Does a UPS still need an SPD? Learn how to protect UPS input, static bypass, maintenance bypass and output circuits, including Type 2, Uc, Up and Isccr.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/id\/ups-surge-protection-device\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-20T06:25:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-21T03:19:58+00:00\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Ditulis oleh\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimasi waktu membaca\" \/>\n\t<meta name=\"twitter:data2\" content=\"16 menit\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ups-surge-protection-device\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ups-surge-protection-device\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"UPS Surge Protection Device: Input, Bypass and Output Selection Guide\",\"datePublished\":\"2026-07-20T06:25:10+00:00\",\"dateModified\":\"2026-07-21T03:19:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ups-surge-protection-device\\\/\"},\"wordCount\":3389,\"articleSection\":[\"News\",\"Surge Protection\",\"Technical Guides\"],\"inLanguage\":\"id\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ups-surge-protection-device\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/ups-surge-protection-device\\\/\",\"name\":\"UPS Surge Protection Device: Input, Bypass & Output Guide\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"datePublished\":\"2026-07-20T06:25:10+00:00\",\"dateModified\":\"2026-07-21T03:19:58+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"description\":\"Does a UPS still need an SPD? 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