{"id":31375,"date":"2026-09-29T09:09:39","date_gmt":"2026-09-29T01:09:39","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31375"},"modified":"2026-09-29T10:01:05","modified_gmt":"2026-09-29T02:01:05","slug":"hospital-automatic-transfer-switch-guide-for-backup-power","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/hospital-automatic-transfer-switch\/","title":{"rendered":"Hospital Automatic Transfer Switch Guide for Backup Power"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31375\" class=\"elementor elementor-31375\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-78fdb47 e-flex e-con-boxed e-con e-parent\" data-id=\"78fdb47\" 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-2cd563f elementor-widget elementor-widget-html\" data-id=\"2cd563f\" data-element_type=\"widget\" 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}\r\n}\r\n<\/style>\r\n\r\n<div id=\"leeyee-hospital-ats-guide\">\r\n\r\n  <p class=\"ly-intro\">\r\n    A <strong>hospital automatic transfer switch<\/strong> should be selected according to the circuit it supplies, not simply because the installation is a hospital. For a generator-backed system, the main engineering question is whether the connected load can tolerate the interruption of an open-transition transfer. Medical locations have specific electrical-installation requirements, so the final transfer arrangement must follow the approved project design and applicable local rules.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-quick\">\r\n    <span class=\"ly-label\">Quick Answer<\/span>\r\n    <p>\r\n      <strong>A compact open-transition ATS may be suitable for hospital general backup distribution, auxiliary equipment or other circuits where a break-before-make transfer is acceptable.<\/strong>\r\n    <\/p>\r\n    <p>\r\n      It should not be assumed suitable for every critical medical or life-safety circuit. If a load cannot tolerate the interruption between normal and generator power, the project may require UPS support or another continuity solution. Open transition is a break-before-make transfer method.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n    <\/p>\r\n    <p>\r\n      Before selecting an ATS, confirm the <strong>load function, allowable interruption, source voltage, rated current, 2P or 4P configuration, neutral treatment, generator interface, fault conditions and applicable project requirements<\/strong>.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-summary-grid\">\r\n    <div class=\"ly-summary-item\">\r\n      <strong>Primary decision<\/strong>\r\n      <span>Can the connected hospital circuit tolerate open-transition transfer?<\/span>\r\n    <\/div>\r\n    <div class=\"ly-summary-item\">\r\n      <strong>LEEYEE product form<\/strong>\r\n      <span>Compact integrated 2P and 4P automatic transfer switches.<\/span>\r\n    <\/div>\r\n    <div class=\"ly-summary-item\">\r\n      <strong>Typical source arrangement<\/strong>\r\n      <span>Normal supply and generator or other approved backup source.<\/span>\r\n    <\/div>\r\n    <div class=\"ly-summary-item\">\r\n      <strong>Important boundary<\/strong>\r\n      <span>Critical medical applications require project-specific engineering confirmation.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n\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\/fr\/hospital-automatic-transfer-switch\/#where-does-an-ats-fit-in-a-hospital-backup-power-system\" >Where Does an ATS Fit in a Hospital Backup Power System?<\/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\/fr\/hospital-automatic-transfer-switch\/#which-hospital-circuits-can-use-a-compact-open-transition-ats\" >Which Hospital Circuits Can Use a Compact Open-Transition 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\/fr\/hospital-automatic-transfer-switch\/#ats-vs-ups-why-a-hospital-may-need-both\" >ATS vs UPS: Why a Hospital May Need Both<\/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\/fr\/hospital-automatic-transfer-switch\/#where-is-the-limit-of-a-standard-open-transition-ats\" >Where Is the Limit of a Standard Open-Transition ATS?<\/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\/fr\/hospital-automatic-transfer-switch\/#start-ats-selection-with-the-load-not-the-ampere-rating\" >Start ATS Selection with the Load, Not the Ampere Rating<\/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\/fr\/hospital-automatic-transfer-switch\/#2p-or-4p-which-leeyee-ats-configuration-fits\" >2P or 4P: Which LEEYEE ATS Configuration Fits?<\/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\/fr\/hospital-automatic-transfer-switch\/#how-generator-start-and-transfer-sequence-affect-selection\" >How Generator Start and Transfer Sequence Affect Selection<\/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\/fr\/hospital-automatic-transfer-switch\/#the-actual-leeyee-ats-product-covered-by-this-guide\" >The Actual LEEYEE ATS Product Covered by This Guide<\/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\/fr\/hospital-automatic-transfer-switch\/#what-must-be-verified-before-ordering\" >What Must Be Verified Before Ordering?<\/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\/fr\/hospital-automatic-transfer-switch\/#which-standards-should-a-hospital-ats-buyer-check\" >Which Standards Should a Hospital ATS Buyer Check?<\/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\/fr\/hospital-automatic-transfer-switch\/#hospital-ats-enquiry-checklist\" >Hospital ATS Enquiry Checklist<\/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\/fr\/hospital-automatic-transfer-switch\/#hospital-automatic-transfer-switch-faq\" >Hospital Automatic Transfer Switch FAQ<\/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\/fr\/hospital-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"where-does-an-ats-fit-in-a-hospital-backup-power-system\"><\/span>Where Does an ATS Fit in a Hospital Backup Power System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A hospital backup-power system can include a normal utility supply, generator sets, transfer equipment, distribution boards, UPS systems and other continuity measures. The ATS has one defined role within that architecture: it transfers its connected load between available power sources.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 applies to transfer switching equipment used to transfer a load between power supply sources. The current edition covers automatic transfer switching equipment and separately addresses bypass\/isolation transfer switching equipment and ATSE with closed-transition capability.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/hospital-backup-power-ats-system-diagram.webp\"\r\n      alt=\"Hospital backup power system diagram showing utility supply, generator, ATS, UPS, general loads and critical loads\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      Conceptual hospital backup-power architecture. The diagram explains the functional relationship between the normal source, generator, ATS, UPS and downstream loads; it is not a project wiring drawing.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>\r\n    In a generator-backed arrangement, the normal source supplies the designated circuit during normal operation. When the normal source becomes unavailable or unacceptable, an ATS control sequence can initiate or respond to the alternate source and transfer the connected load when the required source conditions are satisfied. A typical ATS sequence includes transfer to a stable alternate source and later retransfer after the normal source returns.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <p>\r\n      <strong>Buyer meaning:<\/strong> the ATS changes which source feeds the circuit. It does not automatically make the downstream load uninterrupted.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-hospital-circuits-can-use-a-compact-open-transition-ats\"><\/span>Which Hospital Circuits Can Use a Compact Open-Transition ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The phrase <strong>hospital ATS<\/strong> does not identify one universal switch configuration. The useful selection question is: <strong>what does this circuit supply, and what happens if power is interrupted during transfer?<\/strong>\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 60364-7-710:2021 applies specifically to electrical installations in medical locations, including hospitals and clinics, with the objective of providing safety for patients and medical staff.<sup><a href=\"#ref-1\">[1]<\/a><\/sup> The formal classification and supply requirements therefore have to come from the actual hospital project rather than from a generic product article.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-responsive-table\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:24%;\">Circuit Situation<\/th>\r\n          <th style=\"width:27%;\">Selection Question<\/th>\r\n          <th style=\"width:24%;\">Open-Transition ATS<\/th>\r\n          <th style=\"width:25%;\">Required Action<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Circuit Situation\"><strong>General backup distribution<\/strong><\/td>\r\n          <td data-label=\"Selection Question\">Can the circuit accept an interruption during source transfer?<\/td>\r\n          <td data-label=\"Open-Transition ATS\">Potentially suitable<\/td>\r\n          <td data-label=\"Required Action\">Confirm electrical ratings and approved drawings<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Circuit Situation\"><strong>Auxiliary equipment<\/strong><\/td>\r\n          <td data-label=\"Selection Question\">Can the equipment stop briefly and restart correctly?<\/td>\r\n          <td data-label=\"Open-Transition ATS\">May be suitable<\/td>\r\n          <td data-label=\"Required Action\">Confirm equipment behaviour and sequence of operation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Circuit Situation\"><strong>Sensitive electronic loads<\/strong><\/td>\r\n          <td data-label=\"Selection Question\">Would the transfer interruption stop the required function?<\/td>\r\n          <td data-label=\"Open-Transition ATS\">ATS alone may not be enough<\/td>\r\n          <td data-label=\"Required Action\">Evaluate UPS or other continuity measures<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Circuit Situation\"><strong>Critical or life-safety-related circuits<\/strong><\/td>\r\n          <td data-label=\"Selection Question\">What continuity and regulatory requirements apply?<\/td>\r\n          <td data-label=\"Open-Transition ATS\">Do not assume suitability<\/td>\r\n          <td data-label=\"Required Action\">Follow the approved hospital electrical design<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    This table is a procurement decision aid, not a medical-load classification standard. The actual circuit category and supply requirements must be confirmed from the applicable project documents.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Do not select the transfer method from a room name alone.<\/strong> Terms such as ICU, operating room, laboratory or hospital lighting do not by themselves define the correct ATS architecture. Medical use, circuit function, continuity requirement and local rules must all be considered.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-vs-ups-why-a-hospital-may-need-both\"><\/span>ATS vs UPS: Why a Hospital May Need Both<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    An ATS and a UPS solve different problems. An ATS selects between power sources. A UPS supports the downstream load when power continuity is required through an upstream interruption.\r\n  <\/p>\r\n\r\n  <p>\r\n    Open-transition ATS operation is break-before-make: the first source is disconnected before the second source is connected.<sup><a href=\"#ref-4\">[4]<\/a><\/sup> Therefore, a standard open-transition ATS should not be described as providing zero-interruption power.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/hospital-ats-vs-ups-function-comparison.webp\"\r\n      alt=\"Hospital ATS versus UPS comparison showing source transfer and power continuity functions\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      ATS changes the connected power source; UPS supports power continuity. The correct combination depends on the downstream load and project design.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-responsive-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Decision Point<\/th>\r\n          <th>ATS<\/th>\r\n          <th>UPS<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Main function<\/strong><\/td>\r\n          <td data-label=\"ATS\">Transfer a load between sources<\/td>\r\n          <td data-label=\"UPS\">Support continuity of the connected load<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Generator relationship<\/strong><\/td>\r\n          <td data-label=\"ATS\">Participates in source-transfer logic<\/td>\r\n          <td data-label=\"UPS\">Can support the load while upstream power changes<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Open-transition interruption<\/strong><\/td>\r\n          <td data-label=\"ATS\">A break exists between sources<\/td>\r\n          <td data-label=\"UPS\">May bridge an interruption when correctly designed<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Main selection inputs<\/strong><\/td>\r\n          <td data-label=\"ATS\">Source system, current, poles, load duty and fault conditions<\/td>\r\n          <td data-label=\"UPS\">Load power, runtime, topology and redundancy requirements<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-is-the-limit-of-a-standard-open-transition-ats\"><\/span>Where Is the Limit of a Standard Open-Transition ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 treats several transfer-switching functions separately. Its scope includes ATSE, bypass\/isolation transfer switching equipment and ATSE having closed-transition capability.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    This distinction matters for hospital procurement. A specification that requests closed transition, bypass isolation or another specialist transfer arrangement should not be matched automatically to a standard compact open-transition ATS.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <p>\r\n      <strong>Engineering meaning:<\/strong> if the specification says \u201cclosed transition,\u201d \u201cbypass isolation,\u201d \u201cstatic transfer,\u201d \u201cno-break transfer\u201d or gives another special continuity requirement, the requirement should be reviewed separately instead of being treated as a normal compact ATS application.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"start-ats-selection-with-the-load-not-the-ampere-rating\"><\/span>Start ATS Selection with the Load, Not the Ampere Rating<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Current rating matters, but it should not be the first hospital ATS decision. A better procurement sequence starts with the downstream circuit and its acceptable interruption.\r\n  <\/p>\r\n\r\n  <div class=\"ly-flow\">\r\n    <div class=\"ly-flow-step\">\r\n      <span class=\"ly-step-no\">1<\/span>\r\n      <strong>Identify the circuit and load<\/strong>\r\n      <p>Define exactly what distribution board, auxiliary equipment or other load will be supplied by the ATS.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-flow-step\">\r\n      <span class=\"ly-step-no\">2<\/span>\r\n      <strong>Confirm the allowable interruption<\/strong>\r\n      <p>Determine whether break-before-make transfer is acceptable or whether the circuit needs additional continuity support.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-flow-step\">\r\n      <span class=\"ly-step-no\">3<\/span>\r\n      <strong>Confirm both power sources<\/strong>\r\n      <p>Check the normal and backup source voltage, frequency, phase arrangement and generator control interface.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-flow-step\">\r\n      <span class=\"ly-step-no\">4<\/span>\r\n      <strong>Confirm the 2P or 4P configuration<\/strong>\r\n      <p>Match the product configuration to the actual single-phase or three-phase circuit and the project's neutral-switching requirement.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-flow-step\">\r\n      <span class=\"ly-step-no\">5<\/span>\r\n      <strong>Check electrical and fault conditions<\/strong>\r\n      <p>Confirm rated current, upstream protection and prospective short-circuit conditions against the applicable ATS documentation.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-flow-step\">\r\n      <span class=\"ly-step-no\">6<\/span>\r\n      <strong>Complete project verification<\/strong>\r\n      <p>Check the proposed ATS against the single-line diagram, consultant specification, required standards and project approval documents.<\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"2p-or-4p-which-leeyee-ats-configuration-fits\"><\/span>2P or 4P: Which LEEYEE ATS Configuration Fits?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The LEEYEE compact ATS product form relevant to this guide is offered in <strong>2P and 4P configurations<\/strong>. The choice should follow the actual electrical system rather than the hospital application name.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-responsive-table\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:21%;\">Configuration<\/th>\r\n          <th style=\"width:30%;\">Typical Context<\/th>\r\n          <th style=\"width:49%;\">What Must Be Confirmed<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Configuration\"><strong>2P<\/strong><\/td>\r\n          <td data-label=\"Typical Context\">Relevant single-phase transfer applications<\/td>\r\n          <td data-label=\"What Must Be Confirmed\">System voltage, current, conductor arrangement, load type and project requirements<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Configuration\"><strong>4P<\/strong><\/td>\r\n          <td data-label=\"Typical Context\">Relevant three-phase applications where the project requires four-pole transfer<\/td>\r\n          <td data-label=\"What Must Be Confirmed\">Phase arrangement, neutral treatment, generator connection, earthing\/protection design and approved single-line diagram<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Buyer conclusion: do not specify 4P merely because the building is a hospital. The neutral and source arrangement must be confirmed from the electrical design.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Neutral switching requires project confirmation.<\/strong> The correct arrangement depends on the source and earthing design, generator connection, protection strategy and applicable project requirements. A general article should not override the approved single-line diagram.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-generator-start-and-transfer-sequence-affect-selection\"><\/span>How Generator Start and Transfer Sequence Affect Selection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A generator-backed ATS is part of a sequence rather than an isolated switch. A typical ATS sequence detects loss of the normal source, transfers after the alternate source is stable within the required electrical conditions, and later retransfers when the normal source is restored.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    NFPA 110:2025 addresses emergency and standby power systems, including power sources, transfer equipment, controls and supervisory equipment.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    The exact generator-start delay, transfer delay, retransfer delay and cooldown logic should therefore come from the approved sequence of operation, generator characteristics, connected load and applicable project requirements. A universal hospital delay value should not be copied from a generic article.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <p>\r\n      <strong>Procurement tip:<\/strong> if the generator integrator or consultant has already issued a sequence of operation, start-signal requirement or timing requirement, send that document together with the ATS enquiry.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"the-actual-leeyee-ats-product-covered-by-this-guide\"><\/span>The Actual LEEYEE ATS Product Covered by This Guide<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The image below shows the <strong>actual LEEYEE compact ATS product form<\/strong> discussed in this article. It includes 2P and 4P versions and an integrated front interface with Auto\/Manual operation and source-status indication.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure ly-product-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE compact 2P and 4P automatic transfer switches with Auto Manual operation and source status indication\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      Actual LEEYEE compact ATS product image showing the 2P and 4P product form. Hospital-project suitability must still be confirmed against the connected load, electrical system, project drawings and required technical documents.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-scope\">\r\n    <p><strong>Relevant application boundary:<\/strong><\/p>\r\n    <p>\r\n      This compact ATS can be evaluated for general backup distribution, auxiliary equipment, equipment panels and other low-voltage circuits where an open-transition source transfer is acceptable. It is not presented here as a universal solution for all critical medical or life-safety circuits.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    The product should also not be described as a closed-transition ATS, bypass-isolation ATS, static transfer switch or zero-interruption power system. IEC 60947-6-1:2026 distinguishes those transfer functions from standard ATSE arrangements.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-must-be-verified-before-ordering\"><\/span>What Must Be Verified Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A hospital ATS enquiry should contain enough information to determine whether the actual circuit matches the product. This reduces the risk of choosing a switch that has the correct current rating but the wrong system configuration or transfer behaviour.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-responsive-table\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:28%;\">Item<\/th>\r\n          <th style=\"width:32%;\">Why It Matters<\/th>\r\n          <th style=\"width:40%;\">What to Provide<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Load function<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">Determines the required continuity and whether open transition is acceptable<\/td>\r\n          <td data-label=\"What to Provide\">Equipment or distribution circuit served by the ATS<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Allowed interruption<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">Separates ordinary source-transfer applications from continuity-sensitive loads<\/td>\r\n          <td data-label=\"What to Provide\">Project or equipment requirement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Source voltage and frequency<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">Must match both normal and backup sources<\/td>\r\n          <td data-label=\"What to Provide\">Utility and generator source data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Rated current<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">Defines the required continuous current capability<\/td>\r\n          <td data-label=\"What to Provide\">Design load current and panel rating<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>2P or 4P<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">Must match the intended conductor-transfer arrangement<\/td>\r\n          <td data-label=\"What to Provide\">Single-phase\/three-phase system and neutral requirement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Generator interface<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">Affects the automatic source-transfer sequence<\/td>\r\n          <td data-label=\"What to Provide\">Generator start\/contact and control requirements<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Fault conditions<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">The ATS and protective devices must be coordinated for the actual system<\/td>\r\n          <td data-label=\"What to Provide\">Prospective fault current and upstream protection data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Standards and documents<\/strong><\/td>\r\n          <td data-label=\"Why It Matters\">Hospital requirements differ between jurisdictions and projects<\/td>\r\n          <td data-label=\"What to Provide\">Applicable standards, certificate requirements and consultant specifications<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Procurement conclusion: current rating is only one part of ATS selection. The transfer method, poles, system arrangement, fault conditions and project requirements must also match.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-standards-should-a-hospital-ats-buyer-check\"><\/span>Which Standards Should a Hospital ATS Buyer Check?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Product requirements and medical-installation requirements should be checked separately. One standard does not automatically prove compliance with every requirement of the complete hospital power system.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-responsive-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Reference<\/th>\r\n          <th>Main Scope<\/th>\r\n          <th>Buyer Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Reference\"><strong>IEC 60947-6-1:2026<\/strong><\/td>\r\n          <td data-label=\"Main Scope\">Transfer switching equipment<\/td>\r\n          <td data-label=\"Buyer Meaning\">Verify the transfer-switch product and declared technical scope<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Reference\"><strong>IEC 60364-7-710:2021<\/strong><\/td>\r\n          <td data-label=\"Main Scope\">Electrical installations in medical locations<\/td>\r\n          <td data-label=\"Buyer Meaning\">Verify medical-location installation requirements<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Reference\"><strong>NFPA 110:2025<\/strong><\/td>\r\n          <td data-label=\"Main Scope\">Emergency and standby power systems<\/td>\r\n          <td data-label=\"Buyer Meaning\">Relevant where the project uses the NFPA emergency-power framework<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 applies to transfer switching equipment with rated voltage not exceeding 1,000 V AC or 1,500 V DC and covers several transfer-switching categories, including ATSE, bypass\/isolation equipment and ATSE with closed-transition capability.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 60364-7-710:2021 addresses electrical installations in medical locations, including hospitals and clinics.<sup><a href=\"#ref-1\">[1]<\/a><\/sup> NFPA 110:2025 provides requirements for emergency and standby power systems where that framework applies.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Project confirmation is mandatory.<\/strong> The applicable standards, editions, healthcare rules and approval process depend on the project country and electrical design. Request the actual consultant specification and required document list before confirming the ATS.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"hospital-ats-enquiry-checklist\"><\/span>Hospital ATS Enquiry Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Before requesting a model recommendation, prepare the information below. This turns the enquiry from \u201cI need a hospital ATS\u201d into an engineering selection request that can actually be reviewed.\r\n  <\/p>\r\n\r\n  <ul class=\"ly-checklist\">\r\n    <li>Project country and applicable standards<\/li>\r\n    <li>What load or distribution circuit the ATS will supply<\/li>\r\n    <li>Maximum acceptable transfer interruption<\/li>\r\n    <li>Normal-source voltage and frequency<\/li>\r\n    <li>Generator or backup-source voltage and frequency<\/li>\r\n    <li>Single-phase or three-phase system<\/li>\r\n    <li>Required rated current<\/li>\r\n    <li>Required 2P or 4P configuration<\/li>\r\n    <li>Neutral-switching requirement<\/li>\r\n    <li>Generator start\/contact requirement<\/li>\r\n    <li>Transfer and retransfer sequence requirements<\/li>\r\n    <li>Prospective short-circuit current<\/li>\r\n    <li>Upstream protective-device information<\/li>\r\n    <li>Required certificates or technical documents<\/li>\r\n    <li>Single-line diagram and consultant specification where available<\/li>\r\n  <\/ul>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Need to confirm whether a compact LEEYEE ATS fits your hospital project?<\/h3>\r\n    <p>\r\n      Send the source details, load function, current, 2P or 4P requirement, generator arrangement and relevant project documents. LEEYEE can review the application against the actual compact open-transition ATS scope and identify items that still require project confirmation.\r\n    <\/p>\r\n    <div class=\"ly-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Send Your Hospital ATS Requirement\">\r\n        <span class=\"w-btn-label\">Send Your Hospital ATS Requirement<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"hospital-automatic-transfer-switch-faq\"><\/span>Hospital Automatic Transfer Switch FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Can a compact automatic transfer switch be used in a hospital?<\/h3>\r\n    <p>\r\n      It may be used for circuits where open-transition transfer is acceptable and the electrical ratings and project requirements are satisfied. It should not be assumed suitable for every critical medical or life-safety circuit.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Is the LEEYEE ATS a hospital-grade ATS?<\/h3>\r\n    <p>\r\n      This guide does not make that claim. The product shown is a compact low-voltage automatic transfer switch. Suitability for a hospital project must be verified from the actual circuit, product documentation, required standards and approval requirements.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Does an open-transition ATS provide uninterrupted power?<\/h3>\r\n    <p>\r\n      No. Open transition is break-before-make: one source is disconnected before the other source is connected.<sup><a href=\"#ref-4\">[4]<\/a><\/sup> Loads that cannot tolerate that interruption may need UPS support or another continuity solution.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Is an ATS the same as a UPS?<\/h3>\r\n    <p>\r\n      No. An ATS transfers a circuit between sources. A UPS supports power continuity for its connected load. A hospital backup-power design may use both.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Should I choose a 2P or 4P ATS for a hospital project?<\/h3>\r\n    <p>\r\n      Choose according to the real electrical system. Confirm whether the circuit is single-phase or three-phase and whether the project requires the neutral to be switched. The approved single-line diagram should control the final selection.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Can the ATS work between utility power and a generator?<\/h3>\r\n    <p>\r\n      That is a common ATS architecture. A typical ATS transfers a connected load to an available alternate source and retransfers after the normal source is restored.<sup><a href=\"#ref-4\">[4]<\/a><\/sup> The actual generator interface and timing must still match the project.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>What information matters most before ordering?<\/h3>\r\n    <p>\r\n      Start with the load function and allowable interruption. Then confirm source voltage, current, 2P or 4P configuration, neutral treatment, generator interface, fault conditions and applicable project standards.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Which standards are relevant to hospital ATS selection?<\/h3>\r\n    <p>\r\n      IEC-based projects may reference IEC 60947-6-1 for transfer switching equipment and IEC 60364-7-710 for electrical installations in medical locations. NFPA 110 can also be relevant to projects using the NFPA emergency and standby power framework. The final list must be confirmed for the project location and specification.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-2\">[2]<\/a><\/sup><sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Confirm the application before fixing the ATS model<\/h3>\r\n    <p>\r\n      For a useful technical review, provide the single-line diagram, source details, load function, current, 2P or 4P requirement and applicable project standards.\r\n    <\/p>\r\n    <div class=\"ly-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Request Hospital ATS Application Review\">\r\n        <span class=\"w-btn-label\">Request Hospital ATS Application Review<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"ly-references\">\r\n    <li id=\"ref-1\">\r\n      International Electrotechnical Commission. <em>IEC 60364-7-710:2021 \u2014 Low-voltage electrical installations \u2014 Part 7-710: Requirements for special installations or locations \u2014 Medical locations.<\/em>\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29393\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-2\">\r\n      International Electrotechnical Commission. <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment.<\/em>\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-3\">\r\n      National Fire Protection Association. <em>NFPA 110 \u2014 Standard for Emergency and Standby Power Systems, 2025 Edition.<\/em>\r\n      <a href=\"https:\/\/www.nfpa.org\/product\/nfpa-110-standard-for-emergency-and-standby-power-systems\/p0110code\/nfpa-110-standard-for-emergency-and-standby-power-systems-2025\/11025code\" target=\"_blank\" rel=\"noopener noreferrer\">NFPA official publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-4\">\r\n      Eaton. <em>Fundamentals of Automatic Transfer Switches (ATS).<\/em> Technical explanation of normal and alternate source transfer, typical transfer sequence and open-transition break-before-make operation.\r\n      <a href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton technical resource<\/a>.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n<\/div>\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>A hospital automatic transfer switch should be selected according to the circuit it supplies, not simply because the installation is a hospital. For a generator-backed system, the main engineering question is whether the connected load can tolerate the interruption of an open-transition transfer. Medical locations have specific electrical-installation requirements, so the final transfer arrangement must&#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-31375","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>Hospital Automatic Transfer Switch Guide | Generator Backup ATS<\/title>\n<meta name=\"description\" content=\"Learn where a compact LEEYEE 2P or 4P open-transition ATS can fit in hospital backup power systems, including generator transfer, ATS vs UPS, application limits and project selection requirements.\" \/>\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\/fr\/hospital-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hospital Automatic Transfer Switch Guide | Generator Backup ATS\" \/>\n<meta property=\"og:description\" content=\"Learn where a compact LEEYEE 2P or 4P open-transition ATS can fit in hospital backup power systems, including generator transfer, ATS vs UPS, application limits and project selection requirements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/fr\/hospital-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-29T01:09:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-29T02:01:05+00:00\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/hospital-automatic-transfer-switch\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/hospital-automatic-transfer-switch\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Hospital Automatic Transfer Switch Guide for Backup Power\",\"datePublished\":\"2026-09-29T01:09:39+00:00\",\"dateModified\":\"2026-09-29T02:01:05+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/hospital-automatic-transfer-switch\\\/\"},\"wordCount\":2486,\"articleSection\":[\"Isolator &amp; 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