{"id":31538,"date":"2026-10-08T09:06:30","date_gmt":"2026-10-08T01:06:30","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31538"},"modified":"2026-10-08T09:11:49","modified_gmt":"2026-10-08T01:11:49","slug":"fire-pump-automatic-transfer-switch-guide-nfpa-20-requirements-sizing-selection","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/pt\/fire-pump-automatic-transfer-switch\/","title":{"rendered":"Fire Pump Automatic Transfer Switch Guide: NFPA 20 Requirements, Sizing &#038; Selection"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31538\" class=\"elementor elementor-31538\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-83bc295 e-flex e-con-boxed e-con e-parent\" data-id=\"83bc295\" 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-31288b9 elementor-widget elementor-widget-html\" data-id=\"31288b9\" 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.leeyee-firepump-ats{\r\n  --blue:#004898;\r\n  --blue-dark:#00366f;\r\n  --blue-soft:#eef5ff;\r\n  --blue-pale:#f7fbff;\r\n  --text:#26333f;\r\n  --heading:#172531;\r\n  --muted:#5e6a75;\r\n  --border:#dbe4ec;\r\n  --warning:#95520b;\r\n  --warning-bg:#fff8ed;\r\n  --danger:#963737;\r\n  --danger-bg:#fff5f5;\r\n  --success:#176847;\r\n  --success-bg:#f1faf6;\r\n  width:100%;\r\n  max-width:860px;\r\n  margin:0 auto;\r\n  padding:8px 20px 64px;\r\n  color:var(--text);\r\n  font-family:inherit;\r\n  font-size:17px;\r\n  line-height:1.72;\r\n  box-sizing:border-box;\r\n}\r\n\r\n.leeyee-firepump-ats *,\r\n.leeyee-firepump-ats *::before,\r\n.leeyee-firepump-ats *::after{\r\n  box-sizing:border-box;\r\n}\r\n\r\n.leeyee-firepump-ats p{\r\n  margin:0 0 18px;\r\n}\r\n\r\n.leeyee-firepump-ats h2{\r\n  margin:54px 0 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(max-width:480px){\r\n  .leeyee-firepump-ats{\r\n    padding-left:15px;\r\n    padding-right:15px;\r\n  }\r\n\r\n  .leeyee-firepump-ats h2{\r\n    font-size:25px;\r\n  }\r\n\r\n  .leeyee-firepump-ats h3{\r\n    font-size:20px;\r\n  }\r\n\r\n  .leeyee-firepump-ats .leeyee-quick-answer h2{\r\n    font-size:22px;\r\n  }\r\n\r\n  .leeyee-firepump-ats table{\r\n    min-width:540px;\r\n  }\r\n\r\n  .leeyee-firepump-ats .leeyee-about-btn-light{\r\n    width:100%;\r\n    min-height:50px;\r\n    padding-left:16px;\r\n    padding-right:16px;\r\n  }\r\n}\r\n\r\n@media (max-width:390px){\r\n  .leeyee-firepump-ats{\r\n    padding-left:13px;\r\n    padding-right:13px;\r\n  }\r\n\r\n  .leeyee-firepump-ats h2{\r\n    font-size:24px;\r\n  }\r\n}\r\n\r\n@media (max-width:320px){\r\n  .leeyee-firepump-ats{\r\n    padding-left:10px;\r\n    padding-right:10px;\r\n  }\r\n\r\n  .leeyee-firepump-ats h2{\r\n    font-size:23px;\r\n  }\r\n\r\n  .leeyee-firepump-ats .leeyee-step{\r\n    padding-left:42px;\r\n  }\r\n\r\n  .leeyee-firepump-ats .leeyee-step::before{\r\n    width:31px;\r\n    height:31px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-firepump-ats\">\r\n\r\n  <span class=\"leeyee-kicker\">Engineering &amp; Procurement Guide<\/span>\r\n\r\n  <p class=\"leeyee-intro\">\r\n    A fire pump is not an ordinary standby load. When an installation uses automatic transfer between a normal power source and an alternate source, the transfer equipment must be reviewed as part of the complete fire-pump power system\u2014not selected only from the ampere rating printed on a standard ATS.\r\n  <\/p>\r\n\r\n  <p class=\"leeyee-intro\">\r\n    This guide helps fire-pump controller manufacturers, panel builders, electrical contractors, consultants and project procurement teams determine what must be verified before specifying an automatic transfer switch for a fire pump.\r\n  <\/p>\r\n\r\n  <section class=\"leeyee-quick-answer\">\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 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\/pt\/fire-pump-automatic-transfer-switch\/#quick-answer-can-a-normal-ats-be-used-for-a-fire-pump\" >Quick Answer: Can a Normal ATS Be Used for a Fire Pump?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#why-is-fire-pump-transfer-equipment-different-from-a-normal-ats\" >Why Is Fire-Pump Transfer Equipment Different From a Normal ATS?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#nfpa-20-2025-requirements-buyers-should-recognize\" >NFPA 20:2025 Requirements Buyers Should Recognize<\/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\/pt\/fire-pump-automatic-transfer-switch\/#where-does-the-ats-sit-in-the-fire-pump-power-system\" >Where Does the ATS Sit in the Fire-Pump Power System?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#how-should-fire-pump-ats-current-rating-be-evaluated\" >How Should Fire-Pump ATS Current Rating Be Evaluated?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#is-this-type-of-leeyee-compact-ats-suitable-for-a-fire-pump\" >Is This Type of LEEYEE Compact ATS Suitable for a Fire Pump?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#integrated-ats-or-separate-fire-pump-transfer-equipment\" >Integrated ATS or Separate Fire-Pump Transfer Equipment?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#should-a-fire-pump-ats-be-3-pole-or-4-pole\" >Should a Fire Pump ATS Be 3-Pole or 4-Pole?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#what-changes-when-the-alternate-source-is-a-generator\" >What Changes When the Alternate Source Is a Generator?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#does-every-fire-pump-need-an-ats\" >Does Every Fire Pump Need an ATS?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#does-every-fire-pump-ats-require-bypass-isolation\" >Does Every Fire Pump ATS Require Bypass Isolation?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#what-does-ul-1008-mean-for-fire-pump-ats-procurement\" >What Does UL 1008 Mean for Fire-Pump ATS Procurement?<\/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\/pt\/fire-pump-automatic-transfer-switch\/#how-to-select-fire-pump-transfer-equipment\" >How to Select Fire-Pump Transfer Equipment<\/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\/pt\/fire-pump-automatic-transfer-switch\/#common-fire-pump-ats-selection-mistakes\" >Common Fire Pump ATS Selection Mistakes<\/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\/pt\/fire-pump-automatic-transfer-switch\/#what-should-a-buyer-send-before-requesting-an-ats-review\" >What Should a Buyer Send Before Requesting an ATS Review?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/fire-pump-automatic-transfer-switch\/#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-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/fire-pump-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-can-a-normal-ats-be-used-for-a-fire-pump\"><\/span>Quick Answer: Can a Normal ATS Be Used for a Fire Pump?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      <strong>Do not assume that it can.<\/strong> NFPA 20:2025 Section 10.8.3 contains specific requirements for fire-pump power transfer switches, including fire-pump-service listing, short-circuit suitability, electrically operated and mechanically held construction, and motor-current capability. [1]\r\n    <\/p>\r\n\r\n    <p>\r\n      A standard compact ATS for general standby loads should therefore not be treated as fire-pump transfer equipment merely because its voltage, pole count and nominal current appear suitable.\r\n    <\/p>\r\n\r\n    <div class=\"leeyee-answer-grid\">\r\n      <div class=\"leeyee-answer-item\">\r\n        <strong>Check listing first<\/strong>\r\n        NFPA 20:2025 Section 10.8.3.1 requires the power transfer switch to be specifically listed for fire-pump service. [1]\r\n      <\/div>\r\n\r\n      <div class=\"leeyee-answer-item\">\r\n        <strong>Do not size by running current alone<\/strong>\r\n        Section 10.8.3.4 also addresses motor full-load current and locked-rotor switching capability. [1]\r\n      <\/div>\r\n\r\n      <div class=\"leeyee-answer-item\">\r\n        <strong>Review the controller arrangement<\/strong>\r\n        Transfer equipment, controller, motor and alternate source must be evaluated as a coordinated system.\r\n      <\/div>\r\n\r\n      <div class=\"leeyee-answer-item\">\r\n        <strong>Confirm local adoption<\/strong>\r\n        The project may use NFPA 20, NEC requirements, local amendments or another national fire\/electrical framework.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img fetchpriority=\"high\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/fire-pump-ats-power-system-diagram.webp\"\r\n      alt=\"Fire pump automatic transfer switch power system diagram with normal source, emergency generator, ATS, fire pump controller and motor\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Conceptual fire-pump power architecture. The actual transfer arrangement must follow the approved project design, listed equipment configuration and applicable code.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-boundary\">\r\n    <h3>Important LEEYEE Product Boundary<\/h3>\r\n    <p>\r\n      LEEYEE supplies compact low-voltage automatic transfer switches for general standby power applications, primarily using open-transition transfer.\r\n    <\/p>\r\n    <p>\r\n      A standard LEEYEE compact ATS must <strong>not<\/strong> be described as fire-pump-listed transfer equipment unless the exact model, certification scope and project requirements have been independently verified.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-is-fire-pump-transfer-equipment-different-from-a-normal-ats\"><\/span>Why Is Fire-Pump Transfer Equipment Different From a Normal ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Normal ATS selection usually begins with system voltage, rated current, number of poles and the type of alternate source. These parameters still matter in a fire-pump project, but they are only part of the decision.\r\n  <\/p>\r\n\r\n  <p>\r\n    Fire-pump transfer equipment forms part of a life-safety power arrangement. Motor starting duty, locked-rotor current, available short-circuit current, controller configuration, source sensing and required listing can all affect whether the equipment is acceptable. [1]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Selection Item<\/th>\r\n          <th>General Standby ATS<\/th>\r\n          <th>Fire-Pump Project<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Rated current<\/td>\r\n          <td>Selected for defined load duty<\/td>\r\n          <td>Motor full-load and locked-rotor duty also matter<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Listing \/ approval<\/td>\r\n          <td>Depends on application<\/td>\r\n          <td>Fire-pump-service listing can be mandatory<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Short-circuit suitability<\/td>\r\n          <td>Checked against fault level<\/td>\r\n          <td>Explicitly addressed by NFPA 20 Section 10.8.3.2<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Operating mechanism<\/td>\r\n          <td>Product dependent<\/td>\r\n          <td>NFPA 20 Section 10.8.3.3 specifies electrically operated and mechanically held equipment<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Controller coordination<\/td>\r\n          <td>General load coordination<\/td>\r\n          <td>Must fit the fire-pump controller arrangement<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"leeyee-table-note\">\r\n    Buyer meaning: matching voltage and nominal amperes does not make a general compact ATS equivalent to dedicated fire-pump transfer equipment.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"nfpa-20-2025-requirements-buyers-should-recognize\"><\/span>NFPA 20:2025 Requirements Buyers Should Recognize<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    For projects governed by NFPA 20:2025, the following clauses are especially relevant when reviewing automatic transfer equipment for a fire pump. [1]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-clause-list\">\r\n\r\n    <div class=\"leeyee-clause\">\r\n      <div class=\"leeyee-clause-code\">10.8.2.3<\/div>\r\n      <div class=\"leeyee-clause-text\">\r\n        <strong>Dedicated transfer switch<\/strong>\r\n        Where transfer equipment is required, each fire pump is to have its own dedicated transfer switch or switches.\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-clause\">\r\n      <div class=\"leeyee-clause-code\">10.8.3.1<\/div>\r\n      <div class=\"leeyee-clause-text\">\r\n        <strong>Fire-pump-service listing<\/strong>\r\n        The power transfer switch is required to be specifically listed for fire-pump service.\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-clause\">\r\n      <div class=\"leeyee-clause-code\">10.8.3.2<\/div>\r\n      <div class=\"leeyee-clause-text\">\r\n        <strong>Short-circuit suitability<\/strong>\r\n        The switch must be suitable for the available short-circuit current at the normal and alternate input terminals.\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-clause\">\r\n      <div class=\"leeyee-clause-code\">10.8.3.3<\/div>\r\n      <div class=\"leeyee-clause-text\">\r\n        <strong>Operating construction<\/strong>\r\n        The power transfer switch is required to be electrically operated and mechanically held.\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-clause\">\r\n      <div class=\"leeyee-clause-code\">10.8.3.4<\/div>\r\n      <div class=\"leeyee-clause-text\">\r\n        <strong>Ampere rating and motor duty<\/strong>\r\n        The transfer switch ampere rating is required to be at least 115% of motor full-load current and the switch must also be suitable for switching motor locked-rotor current.\r\n      <\/div>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Project confirmation still comes first.<\/strong>\r\n    These clause numbers refer to NFPA 20:2025. A project may legally adopt another edition, local amendment or different national standard. Confirm the project documents and AHJ requirements before equipment approval.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-does-the-ats-sit-in-the-fire-pump-power-system\"><\/span>Where Does the ATS Sit in the Fire-Pump Power System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A fire-pump installation can receive power from a normal source and, where the approved design requires it, an alternate source such as an emergency generator.\r\n  <\/p>\r\n\r\n  <p>\r\n    The transfer equipment selects the applicable source supplying the fire-pump controller. The controller then manages the fire-pump motor. Dedicated fire-pump systems can integrate or closely coordinate the automatic transfer function with the controller. [1][4]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\">\r\n    <strong>Engineering meaning:<\/strong>\r\n    Review the project single-line diagram before selecting the ATS. The normal source, alternate source, transfer equipment, controller, protective devices and motor should be evaluated together.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-should-fire-pump-ats-current-rating-be-evaluated\"><\/span>How Should Fire-Pump ATS Current Rating Be Evaluated?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    NFPA 20:2025 Section 10.8.3.4 requires the transfer switch ampere rating to be not less than 115% of motor full-load current and also requires suitability for switching motor locked-rotor current. [1]\r\n  <\/p>\r\n\r\n  <p>\r\n    A buyer therefore should not compare only the pump's normal operating current with the catalogue current of an ATS.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/fire-pump-ats-sizing-checklist.webp\"\r\n      alt=\"Fire pump ATS sizing checklist with motor full-load current, locked-rotor current, short-circuit current and certification checks\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Fire-pump ATS sizing is a multi-factor engineering check. Rated current alone does not establish suitability.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>115% is not a complete selection formula.<\/strong>\r\n    Fire-pump listing, locked-rotor switching duty, short-circuit suitability, operating construction, controller arrangement and project approval must still be verified. [1]\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Required Data<\/th>\r\n          <th>Why It Matters<\/th>\r\n          <th>Typical Source<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Motor voltage<\/td>\r\n          <td>Confirms voltage compatibility<\/td>\r\n          <td>Motor nameplate \/ datasheet<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Motor full-load current<\/td>\r\n          <td>Continuous ampere-rating evaluation<\/td>\r\n          <td>Motor \/ controller data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Locked-rotor current<\/td>\r\n          <td>Motor switching duty<\/td>\r\n          <td>Motor technical data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Starting method<\/td>\r\n          <td>Affects system behaviour<\/td>\r\n          <td>Controller specification<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Available fault current<\/td>\r\n          <td>Short-circuit suitability<\/td>\r\n          <td>Electrical study<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"is-this-type-of-leeyee-compact-ats-suitable-for-a-fire-pump\"><\/span>Is This Type of LEEYEE Compact ATS Suitable for a Fire Pump?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The LEEYEE product shown below is the compact automatic transfer switch type that LEEYEE actually supplies for general low-voltage standby source transfer.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure leeyee-figure--product\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE compact automatic transfer switch with Auto Manual control for normal and backup power source transfer\"\r\n      width=\"800\"\r\n      height=\"800\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      LEEYEE compact automatic transfer switch for general low-voltage normal and backup power transfer. Fire-pump suitability requires separate project, certification and controller verification.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>\r\n    A product of this type can be suitable for ordinary standby-power applications when its verified voltage, current, pole configuration and transfer characteristics match the electrical system.\r\n  <\/p>\r\n\r\n  <p>\r\n    However, automatic operation, manual operation and dual-source transfer capability do <strong>not<\/strong> by themselves establish suitability for a fire-pump installation. These functions should not be confused with a fire-pump-service listing.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-boundary\">\r\n    <h3>What This Means for LEEYEE Buyers<\/h3>\r\n    <p>\r\n      LEEYEE's standard compact ATS should be considered for general standby power projects within its verified product specifications.\r\n    <\/p>\r\n    <p>\r\n      If the project specification requires a transfer switch specifically listed for fire-pump service, UL 1008 fire-pump equipment, FM approval or another mandatory fire-protection approval, dedicated certified equipment must be selected instead.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"integrated-ats-or-separate-fire-pump-transfer-equipment\"><\/span>Integrated ATS or Separate Fire-Pump Transfer Equipment?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Fire-pump systems can use transfer equipment integrated with or closely associated with the fire-pump controller, depending on the listed arrangement and project requirements.\r\n  <\/p>\r\n\r\n  <p>\r\n    Tornatech, for example, publishes electric fire-pump controller configurations with automatic transfer switches associated with the controller. Its GPx information references NFPA 20, UL 218 and UL 1008 for defined product configurations. [4]\r\n  <\/p>\r\n\r\n  <p>\r\n    The procurement lesson is simple: dedicated fire-pump transfer equipment is normally evaluated together with its controller application rather than treated as an ordinary upstream ATS.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"should-a-fire-pump-ats-be-3-pole-or-4-pole\"><\/span>Should a Fire Pump ATS Be 3-Pole or 4-Pole?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    There is no universal answer that every fire-pump ATS should be 3-pole or every installation should use 4-pole equipment.\r\n  <\/p>\r\n\r\n  <p>\r\n    A 4-pole ATS switches the neutral together with the phase conductors. A 3-pole ATS normally leaves the neutral unswitched. The correct choice depends on the grounding and neutral design of the complete system.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\">\r\n    <strong>Buyer meaning:<\/strong>\r\n    Do not choose 3P or 4P merely because both versions are available. Confirm the normal-source grounding arrangement, generator neutral, applicable electrical code and approved single-line diagram.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-changes-when-the-alternate-source-is-a-generator\"><\/span>What Changes When the Alternate Source Is a Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    When an emergency generator is the alternate source, the system has to do more than mechanically switch between two sets of terminals.\r\n  <\/p>\r\n\r\n  <p>\r\n    Fire-pump transfer systems can involve source sensing, generator-start signalling, alternate-source verification and controlled transfer\/retransfer functions. The exact sequence must follow the listed equipment documentation and the requirements adopted for the project. [1][4]\r\n  <\/p>\r\n\r\n  <p>\r\n    Do not copy timing values or source thresholds from a general compact ATS into a fire-pump specification unless the listed controller and transfer equipment documentation supports them.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-every-fire-pump-need-an-ats\"><\/span>Does Every Fire Pump Need an ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    No single answer applies to every installation. The need for an alternate source and automatic transfer depends on the governing fire code, reliability of the normal source, facility classification and approved fire-protection design.\r\n  <\/p>\r\n\r\n  <p>\r\n    Where transfer equipment is required under NFPA 20:2025, Section 10.8.2.3 requires each fire pump to have its own dedicated transfer switch or switches. [1]\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-every-fire-pump-ats-require-bypass-isolation\"><\/span>Does Every Fire Pump ATS Require Bypass Isolation?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    No. Bypass isolation should not be presented as a universal requirement worldwide.\r\n  <\/p>\r\n\r\n  <p>\r\n    California healthcare projects show why local requirements matter. HCAI PIN 78, effective February 6, 2025, discusses fire-pump ATS listing and bypass-isolation requirements for the applicable OSHPD healthcare applications. [2]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Do not export a local rule globally.<\/strong>\r\n    A requirement applying to a California healthcare facility should not automatically be applied to a commercial project in Europe, Asia, the Middle East or another jurisdiction.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-ul-1008-mean-for-fire-pump-ats-procurement\"><\/span>What Does UL 1008 Mean for Fire-Pump ATS Procurement?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    UL 1008 is an important transfer-switch standard, but a generic \u201cUL 1008\u201d statement does not by itself prove that a particular model is approved for the exact fire-pump application being specified.\r\n  <\/p>\r\n\r\n  <p>\r\n    Buyers should verify the exact manufacturer, model, certification category and application scope instead of relying only on a logo or marketing claim.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\">\r\n    <strong>Certification check:<\/strong>\r\n    UL Solutions identifies Product iQ as its official certification-information database. Buyers can use manufacturer, model, file number and product-category information to verify certification records. [3]\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-select-fire-pump-transfer-equipment\"><\/span>How to Select Fire-Pump Transfer Equipment<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/fire-pump-ats-selection-flow.webp\"\r\n      alt=\"Fire pump ATS selection flow showing code, motor data, controller, power sources, poles, certification and project approval\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Recommended review sequence: confirm requirements first, then motor duty, controller, power sources, electrical ratings, neutral arrangement, certification and project approval.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-steps\">\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Identify the governing requirements.<\/strong>\r\n      Confirm country, facility type, project specification, adopted fire standard, electrical code and AHJ requirements.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Collect complete motor data.<\/strong>\r\n      Record voltage, frequency, kW or HP, full-load current and locked-rotor information.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Confirm the fire-pump controller.<\/strong>\r\n      Identify manufacturer, exact model, starting method and intended transfer arrangement.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Identify both power sources.<\/strong>\r\n      Confirm the normal source and the generator or other approved alternate source.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Evaluate electrical duty.<\/strong>\r\n      Check continuous current, locked-rotor switching duty and available short-circuit current.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Confirm pole and neutral configuration.<\/strong>\r\n      Use the grounding design and approved single-line diagram rather than choosing 3P or 4P by habit.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Verify listing and certification scope.<\/strong>\r\n      Confirm the exact model rather than accepting a general certification statement.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>Obtain final project approval.<\/strong>\r\n      Review the transfer equipment, controller, sources, motor and project drawings as one complete system.\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-fire-pump-ats-selection-mistakes\"><\/span>Common Fire Pump ATS Selection Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Mistake<\/th>\r\n          <th>Why It Creates Risk<\/th>\r\n          <th>Better Action<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Selecting only by amperes<\/td>\r\n          <td>Ignores motor and project conditions<\/td>\r\n          <td>Review full motor and controller data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Assuming any automatic ATS is suitable<\/td>\r\n          <td>General ATS and fire-pump ATS are not automatically equivalent<\/td>\r\n          <td>Verify listing and application scope<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Using a compact ATS because it fits physically<\/td>\r\n          <td>Physical size does not prove compliance<\/td>\r\n          <td>Check listing, motor duty and fault rating<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Choosing 3P or 4P by habit<\/td>\r\n          <td>Neutral treatment depends on grounding design<\/td>\r\n          <td>Follow the approved one-line diagram<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Ignoring fault current<\/td>\r\n          <td>Equipment may not be suitable for the installation<\/td>\r\n          <td>Obtain project short-circuit data<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-a-buyer-send-before-requesting-an-ats-review\"><\/span>What Should a Buyer Send Before Requesting an ATS Review?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-checklist\">\r\n    <h3>Project Review Checklist<\/h3>\r\n    <ul>\r\n      <li>Project country and facility type<\/li>\r\n      <li>Applicable fire and electrical code<\/li>\r\n      <li>Required listing or certification<\/li>\r\n      <li>Motor kW \/ HP<\/li>\r\n      <li>Motor voltage and frequency<\/li>\r\n      <li>Motor full-load current<\/li>\r\n      <li>Locked-rotor current or starting data<\/li>\r\n      <li>Starting method<\/li>\r\n      <li>Fire-pump controller manufacturer and model<\/li>\r\n      <li>Normal power source<\/li>\r\n      <li>Generator or alternate source<\/li>\r\n      <li>Available short-circuit current<\/li>\r\n      <li>Grounding and neutral arrangement<\/li>\r\n      <li>Required pole configuration<\/li>\r\n      <li>Single-line diagram<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-cta\">\r\n    <h3>Need to Review an ATS Configuration Before Ordering?<\/h3>\r\n    <p>\r\n      Send the motor data, system voltage, normal and alternate source information, controller details, pole requirements and project certification requirements. LEEYEE can help determine whether the electrical requirements fit a standard compact ATS application or whether dedicated fire-pump transfer equipment is required.\r\n    <\/p>\r\n\r\n    <button type=\"button\"\r\n            class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n            aria-label=\"Send Your ATS Project Requirements\">\r\n      <span class=\"w-btn-label\">Send Your ATS Project Requirements<\/span>\r\n    <\/button>\r\n  <\/div>\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=\"leeyee-faq\">\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Can I use a normal ATS for a fire pump?<\/h3>\r\n      <p>\r\n        Do not assume so. For projects governed by NFPA 20:2025, Section 10.8.3.1 requires the power transfer switch to be specifically listed for fire-pump service. [1]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Is a compact LEEYEE ATS a fire-pump ATS?<\/h3>\r\n      <p>\r\n        LEEYEE's standard compact ATS products are intended for general low-voltage standby power transfer. They should not be represented as fire-pump-listed equipment unless the exact model and required certification scope have been verified.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>How do I size a fire pump automatic transfer switch?<\/h3>\r\n      <p>\r\n        For NFPA 20:2025 projects, Section 10.8.3.4 requires at least 115% of motor full-load current and suitability for switching locked-rotor current. Other listing, short-circuit and controller requirements must also be checked. [1]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Should a fire pump ATS be 3-pole or 4-pole?<\/h3>\r\n      <p>\r\n        The answer depends on system grounding and neutral treatment. Confirm the generator neutral, electrical code, controller requirements and approved one-line diagram before deciding.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Can one ATS serve several fire pumps?<\/h3>\r\n      <p>\r\n        For projects governed by NFPA 20:2025, Section 10.8.2.3 requires each fire pump to have its own dedicated transfer switch where transfer equipment is required. [1]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Does every fire pump ATS require bypass isolation?<\/h3>\r\n      <p>\r\n        No global rule should be assumed. Some jurisdictions and facility types impose additional requirements. HCAI PIN 78 is one specific California healthcare example. [2]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>How can I verify a UL certification claim?<\/h3>\r\n      <p>\r\n        Check the exact manufacturer, model, file number or product category in UL Product iQ rather than relying only on a UL logo or a general UL 1008 statement. [3]\r\n      <\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-sources\">\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ol>\r\n      <li>\r\n        National Fire Protection Association (NFPA), <em>NFPA 20: Standard for the Installation of Stationary Pumps for Fire Protection<\/em>, 2025 Edition. See Section 10.8.2.3 and Sections 10.8.3.1\u201310.8.3.4. Verify the edition legally adopted for the project.\r\n        <a href=\"https:\/\/link.nfpa.org\/all-publications\/33\/2007\" target=\"_blank\" rel=\"noopener noreferrer\">NFPA publication information<\/a>.\r\n      <\/li>\r\n      <li>\r\n        California Department of Health Care Access and Information (HCAI), <em>PIN 78 \u2014 Fire Pump Automatic Transfer Switches<\/em>, effective February 6, 2025.\r\n        <a href=\"https:\/\/hcai.ca.gov\/document\/pin-78-fire-pump-automatic-transfer-switches\/\" target=\"_blank\" rel=\"noopener noreferrer\">HCAI PIN 78<\/a>.\r\n      <\/li>\r\n      <li>\r\n        UL Solutions, <em>Product iQ<\/em> certification-information resources.\r\n        <a href=\"https:\/\/www.ul.com\/thecodeauthority\/knowledge\/ul-listed-certified-database-product-iq\" target=\"_blank\" rel=\"noopener noreferrer\">UL Product iQ guidance<\/a>.\r\n      <\/li>\r\n      <li>\r\n        Tornatech, <em>GPx Series \u2014 Electric Fire Pump Controllers<\/em>. Published information describes defined fire-pump controller and automatic transfer configurations referencing NFPA 20, UL 218 and UL 1008.\r\n        <a href=\"https:\/\/www.tornatech.com\/product\/gpx-series-electric-fire-pump-controllers-4\/\" target=\"_blank\" rel=\"noopener noreferrer\">Tornatech GPx Series<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\ndocument.addEventListener('DOMContentLoaded', function () {\r\n  var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n  aboutPopupButtons.forEach(function (button) {\r\n    button.addEventListener('click', function () {\r\n      var realPopupTrigger = document.querySelector(\r\n        '.w-popup.ush_popup_1 .w-popup-trigger'\r\n      );\r\n\r\n      if (realPopupTrigger) {\r\n        realPopupTrigger.click();\r\n      } else {\r\n        window.open(\r\n          'https:\/\/www.cnspd.com\/contact\/',\r\n          '_blank',\r\n          'noopener'\r\n        );\r\n      }\r\n    });\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>Engineering &amp; Procurement GuideA fire pump is not an ordinary standby load. When an installation uses automatic transfer between a normal power source and an alternate source, the transfer equipment must be reviewed as part of the complete fire-pump power system\u2014not selected only from the ampere rating printed on a standard ATS. This guide helps&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[490,1,422],"tags":[],"class_list":["post-31538","post","type-post","status-publish","format-standard","hentry","category-isolator-switching","category-news","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fire Pump Automatic Transfer Switch Guide | NFPA 20 ATS Requirements<\/title>\n<meta name=\"description\" content=\"Learn how to evaluate a fire pump automatic transfer switch, including NFPA 20 requirements, motor full-load and locked-rotor current, 3P vs 4P, UL 1008 verification, generator coordination and when a standard compact ATS is not suitable.\" \/>\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\/pt\/fire-pump-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fire Pump Automatic Transfer Switch Guide | NFPA 20 ATS Requirements\" \/>\n<meta property=\"og:description\" content=\"Learn how to evaluate a fire pump automatic transfer switch, including NFPA 20 requirements, motor full-load and locked-rotor current, 3P vs 4P, UL 1008 verification, generator coordination and when a standard compact ATS is not suitable.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/pt\/fire-pump-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-08T01:06:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-08T01:11:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/fire-pump-ats-power-system-diagram.webp\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/fire-pump-automatic-transfer-switch\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/fire-pump-automatic-transfer-switch\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Fire Pump Automatic Transfer Switch Guide: NFPA 20 Requirements, Sizing &#038; 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