{"id":31586,"date":"2026-10-10T09:36:55","date_gmt":"2026-10-10T01:36:55","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31586"},"modified":"2026-10-10T09:48:24","modified_gmt":"2026-10-10T01:48:24","slug":"automatic-transfer-switch-for-airport-lighting-backup-power","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/airport-lighting-automatic-transfer-switch\/","title":{"rendered":"Automatic Transfer Switch for Airport Lighting &#038; Backup Power"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31586\" class=\"elementor elementor-31586\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2768d87 e-flex e-con-boxed e-con e-parent\" data-id=\"2768d87\" 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-c6e51ac elementor-widget elementor-widget-html\" data-id=\"c6e51ac\" 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#e5ebf0;\r\n    font-size: 14.5px;\r\n  }\r\n\r\n  .leeyee-airport-ats td::before {\r\n    content: attr(data-label);\r\n    color: var(--blue);\r\n    font-weight: 700;\r\n  }\r\n\r\n  .leeyee-airport-ats tbody tr td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .leeyee-airport-ats .leeyee-figure {\r\n    margin: 23px 0 29px;\r\n  }\r\n\r\n  .leeyee-airport-ats .leeyee-product-figure {\r\n    max-width: 100%;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  .leeyee-airport-ats h2 {\r\n    font-size: 23px;\r\n  }\r\n\r\n  .leeyee-airport-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  .leeyee-airport-ats td {\r\n    grid-template-columns: 108px minmax(0, 1fr);\r\n    gap: 8px;\r\n  }\r\n}\r\n\r\n@media (max-width: 360px) {\r\n  .leeyee-airport-ats .leeyee-quick,\r\n  .leeyee-airport-ats .leeyee-note,\r\n  .leeyee-airport-ats .leeyee-warning,\r\n  .leeyee-airport-ats .leeyee-critical,\r\n  .leeyee-airport-ats .leeyee-checklist,\r\n  .leeyee-airport-ats .leeyee-scope,\r\n  .leeyee-airport-ats .leeyee-cta {\r\n    padding-left: 15px;\r\n    padding-right: 15px;\r\n  }\r\n\r\n  .leeyee-airport-ats td {\r\n    grid-template-columns: 1fr;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-airport-ats\">\r\n\r\n  <span class=\"leeyee-topic-label\">Airport Backup Power \u00b7 ATS Engineering Selection<\/span>\r\n\r\n  <p class=\"leeyee-intro\">\r\n    An automatic transfer switch can be part of an airport backup-power system, but\r\n    <strong>airport auxiliary power and aviation-critical power are not the same application<\/strong>.\r\n    A compact open-transition ATS may be evaluated for suitable low-voltage auxiliary circuits, while\r\n    airfield lighting and other aviation-critical systems can have much stricter requirements for transfer time,\r\n    redundancy, control logic, equipment construction and project approval.\r\n  <\/p>\r\n\r\n  <p>\r\n    For airport electrical contractors, switchboard manufacturers, generator integrators and project procurement\r\n    teams, the first question should therefore not be simply \u201cWhich airport ATS should I buy?\u201d It should be:\r\n    <strong>what load is being transferred, how long may that load lose power, and what does the approved project\r\n    specification require?<\/strong>\r\n  <\/p>\r\n\r\n  <section class=\"leeyee-quick\">\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\/airport-lighting-automatic-transfer-switch\/#quick-answer-can-a-standard-ats-be-used-in-an-airport\" >Quick Answer: Can a Standard ATS Be Used in an Airport?<\/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\/airport-lighting-automatic-transfer-switch\/#where-can-an-automatic-transfer-switch-fit-in-an-airport\" >Where Can an Automatic Transfer Switch Fit in an Airport?<\/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\/airport-lighting-automatic-transfer-switch\/#how-does-an-ats-work-with-an-airport-standby-generator\" >How Does an ATS Work With an Airport Standby Generator?<\/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\/airport-lighting-automatic-transfer-switch\/#ats-switching-time-is-not-the-same-as-total-backup-power-restoration-time\" >ATS Switching Time Is Not the Same as Total Backup-Power Restoration Time<\/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\/airport-lighting-automatic-transfer-switch\/#why-airfield-lighting-requires-a-different-level-of-review\" >Why Airfield Lighting Requires a Different Level of Review<\/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\/airport-lighting-automatic-transfer-switch\/#why-an-airport-lighting-tender-ats-may-be-very-different-from-a-compact-ats\" >Why an Airport Lighting Tender ATS May Be Very Different From a Compact ATS<\/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\/airport-lighting-automatic-transfer-switch\/#what-does-open-transition-mean-for-airport-ats-selection\" >What Does Open Transition Mean for Airport ATS 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\/airport-lighting-automatic-transfer-switch\/#which-transfer-switch-standard-should-the-buyer-check\" >Which Transfer-Switch Standard Should the Buyer Check?<\/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\/airport-lighting-automatic-transfer-switch\/#what-should-be-confirmed-before-selecting-an-airport-ats\" >What Should Be Confirmed Before Selecting an Airport ATS?<\/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\/airport-lighting-automatic-transfer-switch\/#remote-status-and-alarm-signals-should-be-defined-early\" >Remote Status and Alarm Signals Should Be Defined Early<\/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\/airport-lighting-automatic-transfer-switch\/#where-does-the-standard-leeyee-ats-fit\" >Where Does the Standard LEEYEE ATS Fit?<\/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\/airport-lighting-automatic-transfer-switch\/#a-practical-four-step-airport-ats-decision\" >A Practical Four-Step Airport ATS Decision<\/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\/airport-lighting-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-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/airport-lighting-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-can-a-standard-ats-be-used-in-an-airport\"><\/span>Quick Answer: Can a Standard ATS Be Used in an Airport?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      <strong>Yes, for some circuits\u2014but never by assumption.<\/strong>\r\n      A conventional open-transition automatic transfer switch may be considered for airport auxiliary loads when\r\n      the load can tolerate the transfer interruption and the exact ATS satisfies the electrical ratings,\r\n      source arrangement, short-circuit coordination, control requirements and project specification.\r\n    <\/p>\r\n\r\n    <p>\r\n      Airfield visual aids, CAT II\/CAT III-related systems, navigation-related equipment and other\r\n      aviation-critical loads require application-specific engineering confirmation. FAA guidance, for example,\r\n      establishes particular secondary-power performance for defined airport visual-aid applications; those\r\n      requirements should not be generalized to every electrical circuit in an airport.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n    <\/p>\r\n\r\n    <div class=\"leeyee-answer-grid\">\r\n      <div class=\"leeyee-answer-item\">\r\n        <strong>Conventional auxiliary circuit?<\/strong><br>\r\n        A standard ATS may enter the selection process after electrical and project review.\r\n      <\/div>\r\n\r\n      <div class=\"leeyee-answer-item\">\r\n        <strong>Aviation-critical circuit?<\/strong><br>\r\n        Verify the complete approved power architecture before selecting the transfer equipment.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <div class=\"leeyee-keyline\">\r\n    Buyer meaning: classify the airport load first. ATS current rating alone cannot tell you whether the transfer solution is suitable.\r\n  <\/div>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/airport-automatic-transfer-switch-backup-power-system-diagram.webp\"\r\n      alt=\"Airport automatic transfer switch backup power system diagram showing utility, generator, ATS and auxiliary load\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Simplified utility-generator backup architecture. The ATS is one part of the complete restoration sequence;\r\n      generator starting, source validation and project control logic must also be considered.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-can-an-automatic-transfer-switch-fit-in-an-airport\"><\/span>Where Can an Automatic Transfer Switch Fit in an Airport?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Airports contain many types of electrical loads. A terminal auxiliary distribution board, a control cabinet\r\n    and an airfield visual-aid system have different consequences when power is interrupted, so they should not\r\n    be treated as one generic \u201cairport critical power\u201d application.\r\n  <\/p>\r\n\r\n  <p class=\"leeyee-table-intro\">\r\n    Focus first on the \u201cSelection Position\u201d column. It indicates whether a conventional ATS can reasonably enter the project evaluation.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Airport Circuit<\/th>\r\n          <th>Typical Decision<\/th>\r\n          <th>Selection Position<\/th>\r\n          <th>What Must Be Confirmed<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Circuit\">Auxiliary distribution<\/td>\r\n          <td data-label=\"Decision\">Automatic backup may be required<\/td>\r\n          <td data-label=\"Position\">Standard ATS may be evaluated<\/td>\r\n          <td data-label=\"Confirm\">Load, poles, fault level and interruption tolerance<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Circuit\">Equipment-room loads<\/td>\r\n          <td data-label=\"Decision\">Depends on equipment function<\/td>\r\n          <td data-label=\"Position\">Standard ATS may be evaluated<\/td>\r\n          <td data-label=\"Confirm\">Load type and acceptable outage duration<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Circuit\">Monitoring or control cabinets<\/td>\r\n          <td data-label=\"Decision\">Continuity requirement may vary<\/td>\r\n          <td data-label=\"Position\">ATS or another solution may be needed<\/td>\r\n          <td data-label=\"Confirm\">ATS versus UPS requirement and control interface<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Circuit\">Emergency or safety-related systems<\/td>\r\n          <td data-label=\"Decision\">Project-specific<\/td>\r\n          <td data-label=\"Position\">Engineering approval required<\/td>\r\n          <td data-label=\"Confirm\">Local rules, consultant design and continuity requirement<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Circuit\">Airfield visual aids<\/td>\r\n          <td data-label=\"Decision\">Special secondary-power requirements may apply<\/td>\r\n          <td data-label=\"Position\">Do not assume a compact ATS is suitable<\/td>\r\n          <td data-label=\"Confirm\">Aviation guidance, transfer time and approved architecture<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Circuit\">Navigation or aviation-critical equipment<\/td>\r\n          <td data-label=\"Decision\">System-specific<\/td>\r\n          <td data-label=\"Position\">Specialist design required<\/td>\r\n          <td data-label=\"Confirm\">Applicable rules, redundancy and equipment approval<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"leeyee-table-conclusion\">\r\n    Procurement conclusion: \u201cairport application\u201d is not enough information for ATS selection. The actual circuit function and permitted interruption must be identified first.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/airport-ats-load-classification-selection-guide.webp\"\r\n      alt=\"Airport ATS load classification guide for auxiliary, critical and aviation safety power systems\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Airport loads should be separated into conventional auxiliary, project-critical and aviation safety-critical\r\n      categories before deciding whether a standard open-transition ATS is appropriate.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-critical\">\r\n    <strong>Important application boundary<\/strong>\r\n    The fact that an ATS is used somewhere in an airport does not prove that the same type of ATS is suitable for\r\n    runway lighting, taxiway lighting, navigation equipment or another aviation-critical circuit. Final equipment\r\n    selection must follow the applicable project documents and authority requirements.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-an-ats-work-with-an-airport-standby-generator\"><\/span>How Does an ATS Work With an Airport Standby Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    In a generator-backed system, the ATS does not create emergency power. Its role is to evaluate source\r\n    conditions and transfer the connected load between acceptable power sources according to the approved control sequence.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-steps\">\r\n    <div class=\"leeyee-step\">\r\n      <strong>Normal source becomes unacceptable<\/strong>\r\n      The control system detects that the normal source no longer satisfies its configured acceptance conditions.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>The standby source is called<\/strong>\r\n      Where a standby generator is used, the required generator-start command is issued.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>The alternate source becomes acceptable<\/strong>\r\n      The generator must start and reach the voltage and frequency conditions required by the project control sequence.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <strong>The load transfers<\/strong>\r\n      The ATS transfers when the alternate source and programmed control conditions permit the operation.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>\r\n    When normal power returns, retransfer may also include source-stability and timing logic. Exact thresholds,\r\n    delays, generator controls and retransfer behaviour must be confirmed from the selected ATS\/controller and\r\n    project control philosophy rather than assumed from a generic sequence.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-switching-time-is-not-the-same-as-total-backup-power-restoration-time\"><\/span>ATS Switching Time Is Not the Same as Total Backup-Power Restoration Time<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    This distinction is especially important in airport projects.\r\n    <strong>ATS switching time describes the transfer action under defined source conditions.<\/strong>\r\n    Total restoration time can also include source-failure detection, generator starting, generator acceleration,\r\n    voltage and frequency stabilization, programmed delays and then the transfer operation.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-switching-time-vs-airport-backup-restoration-time.webp\"\r\n      alt=\"ATS switching time versus total airport generator backup power restoration time diagram\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      A short ATS transfer action does not by itself prove that a complete generator-backed airport system meets a specified restoration or changeover time.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Do not compare one ATS switching-time value directly with an airport system requirement.<\/strong>\r\n    If the project limits the time from loss of normal power to restoration of the load, the complete\r\n    secondary-power system must be evaluated.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-airfield-lighting-requires-a-different-level-of-review\"><\/span>Why Airfield Lighting Requires a Different Level of Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    FAA Advisory Circular AC 150\/5340-30J is currently listed by the FAA as active guidance for the design and\r\n    installation of airport visual aids.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For the two-source arrangements addressed by that guidance, the FAA states that the second source should\r\n    generally be available within 15 seconds after interruption of the prime source. For essential visual aids\r\n    associated with Category II operations, the guidance establishes a one-second changeover requirement.\r\n    <sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    These figures demonstrate why an airport lighting automatic transfer switch cannot be selected only from a\r\n    conventional ATS datasheet. Source availability, generator operating strategy, control logic and the complete\r\n    airfield-lighting architecture can determine whether the required system performance is achieved.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-note\">\r\n    <strong>Engineering meaning<\/strong>\r\n    A one-second changeover requirement does not simply mean \u201cchoose an ATS that operates in less than one second.\u201d\r\n    The complete power-system arrangement must achieve the required result.\r\n  <\/div>\r\n\r\n  <p>\r\n    Singapore Changi Airport provides a real published example. The Singapore AIP states that automatic standby\r\n    generator power is available for airfield lighting and identifies a one-second switch-over time during\r\n    Category II low-visibility operations.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    That is an airport-specific published operating condition. It should not be interpreted as a universal\r\n    requirement for every airport, every lighting circuit or every jurisdiction.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-an-airport-lighting-tender-ats-may-be-very-different-from-a-compact-ats\"><\/span>Why an Airport Lighting Tender ATS May Be Very Different From a Compact ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Another important procurement distinction appears in real airport tender specifications. A tender that uses\r\n    the words \u201cautomatic transfer switch\u201d may actually describe an integrated power panel or powerhouse system,\r\n    not a small stand-alone transfer device.\r\n  <\/p>\r\n\r\n  <p>\r\n    A published Airfield Ground Lighting technical specification for Clark International Airport, for example,\r\n    contains a dedicated section for a <strong>Dual Automatic Transfer Switch<\/strong> and describes an integrated\r\n    system involving generator-source priority, automatic generator control, transfer and retransfer timing,\r\n    voltage monitoring, indication, metering and associated panel functions.<sup><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-feature-grid\">\r\n    <div class=\"leeyee-feature-item\">\r\n      <strong>Multiple source logic<\/strong>\r\n      The project may define normal, standby and generator priority behaviour rather than a simple two-source transfer.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-feature-item\">\r\n      <strong>Generator control<\/strong>\r\n      Automatic start, stop, source availability and failure conditions may form part of the complete control scheme.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-feature-item\">\r\n      <strong>Adjustable timing<\/strong>\r\n      Transfer and retransfer delays may be specified as part of the project control philosophy.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-feature-item\">\r\n      <strong>Monitoring and indication<\/strong>\r\n      Voltage monitoring, metering, status indication and alarms may be required at panel level.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-feature-item\">\r\n      <strong>Panel construction<\/strong>\r\n      The ATS may be only one component inside a larger project-specific switchboard or power-house assembly.\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-feature-item\">\r\n      <strong>Documentation<\/strong>\r\n      Schematics, control logic, equipment schedules and approval documentation can be part of the deliverable.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>This does not mean every airport requires the same large dual-ATS system.<\/strong>\r\n    The Clark specification is useful because it demonstrates a broader principle: \u201cairport ATS\u201d is often a\r\n    project-defined electrical system, not one universal product category.\r\n  <\/div>\r\n\r\n  <p>\r\n    For procurement teams, this means an airfield-lighting tender should be compared line by line with the proposed\r\n    equipment. A compact automatic transfer switch should not be presented as a direct substitute for a dedicated\r\n    airfield-lighting transfer panel simply because both documents use the term \u201cATS.\u201d\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-open-transition-mean-for-airport-ats-selection\"><\/span>What Does Open Transition Mean for Airport ATS Selection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Open transition is a <strong>break-before-make<\/strong> transfer method: the connected load is disconnected\r\n    from one source before it is connected to the other source. The load therefore experiences an interruption\r\n    during transfer.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    Whether this interruption is acceptable depends on the load and the approved power-system design. A conventional\r\n    auxiliary circuit may accept open transition, while a more interruption-sensitive system may require another continuity strategy.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-note\">\r\n    <strong>Do not treat ATS, UPS and specialised transfer architectures as interchangeable.<\/strong>\r\n    If a connected load cannot tolerate the interruption associated with open transition, the engineering team\r\n    must select a continuity architecture appropriate to that requirement.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-transfer-switch-standard-should-the-buyer-check\"><\/span>Which Transfer-Switch Standard Should the Buyer Check?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 is the current IEC international standard for transfer switching equipment within its\r\n    defined scope. It applies to transfer switching equipment used to transfer a load between power sources where\r\n    rated voltage does not exceed 1,000 V AC or 1,500 V DC.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    The 2026 edition covers automatic transfer switching equipment and also contains specific provisions for\r\n    bypass\/isolation transfer equipment, ATSE with closed-transition capability and stand-alone ATS controllers.\r\n    <sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Product-standard compliance is not the same as airport application approval.<\/strong>\r\n    Compliance with a transfer-switch product standard does not by itself prove that a particular ATS is suitable\r\n    for a particular runway-lighting, navigation, emergency or other aviation-critical circuit. Project requirements\r\n    still have to be verified separately.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-be-confirmed-before-selecting-an-airport-ats\"><\/span>What Should Be Confirmed Before Selecting an Airport ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-checklist\">\r\n    <h3>Before sending an ATS enquiry, prepare these project details:<\/h3>\r\n\r\n    <ul>\r\n      <li><strong>Exact load function:<\/strong> identify what the circuit actually supplies.<\/li>\r\n      <li><strong>Load classification:<\/strong> conventional auxiliary, project-critical or aviation-critical.<\/li>\r\n      <li><strong>System voltage and frequency:<\/strong> use the actual project values.<\/li>\r\n      <li><strong>Phase and pole requirement:<\/strong> including whether the neutral needs to be switched.<\/li>\r\n      <li><strong>Continuous design current:<\/strong> together with relevant load characteristics.<\/li>\r\n      <li><strong>Normal source:<\/strong> utility, transformer or another approved source.<\/li>\r\n      <li><strong>Alternate source:<\/strong> generator, second utility source or another approved supply.<\/li>\r\n      <li><strong>Maximum permitted interruption:<\/strong> state the required system performance.<\/li>\r\n      <li><strong>Available fault current and upstream protection:<\/strong> needed for coordination review.<\/li>\r\n      <li><strong>Generator interface:<\/strong> start command, source-available feedback and required control logic.<\/li>\r\n      <li><strong>Transfer \/ retransfer logic:<\/strong> provide any project-defined timers or source priorities.<\/li>\r\n      <li><strong>Remote status requirements:<\/strong> define the required dry contacts or communication points.<\/li>\r\n      <li><strong>Applicable standards and approvals:<\/strong> provide consultant, airport or local project requirements.<\/li>\r\n      <li><strong>Single-line diagram and control schematic:<\/strong> these are often more useful than the phrase \u201cairport ATS.\u201d<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"remote-status-and-alarm-signals-should-be-defined-early\"><\/span>Remote Status and Alarm Signals Should Be Defined Early<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Airport projects may require transfer equipment to exchange status information with a generator controller,\r\n    PLC, BMS or another supervisory system. The required interface must be defined by the project rather than assumed.\r\n  <\/p>\r\n\r\n  <p>\r\n    Typical project enquiries may request signals such as\r\n    <strong>Normal Available, Emergency Available, Load to Normal, Load to Emergency, Auto\/Manual status and Fault Alarm<\/strong>.\r\n    Whether those signals are available, how they are wired and whether additional communication functions are\r\n    required must be confirmed against the exact ATS\/controller configuration.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-note\">\r\n    <strong>Buyer meaning<\/strong>\r\n    Send the required I\/O schedule or control schematic with the enquiry. It gives the supplier a much clearer\r\n    basis for model confirmation than a general request for \u201cATS with remote monitoring.\u201d\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-does-the-standard-leeyee-ats-fit\"><\/span>Where Does the Standard LEEYEE ATS Fit?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The product below shows the actual compact ATS form supplied by LEEYEE. This matters because many airport\r\n    tender documents use the term \u201cATS\u201d for much larger integrated transfer panels. Those are not automatically\r\n    the same product category.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure leeyee-product-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/3.png\"\r\n      alt=\"LEEYEE compact 2P and 4P automatic transfer switches for low-voltage backup power applications\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Actual LEEYEE compact automatic transfer switch. For airport projects, this type of ATS should be evaluated\r\n      for suitable low-voltage auxiliary and conventional backup circuits only after the project requirements are confirmed.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-scope\">\r\n    <h3>LEEYEE standard supply is positioned for conventional low-voltage open-transition applications.<\/h3>\r\n\r\n    <p>\r\n      For an airport project, the standard compact LEEYEE ATS should be evaluated only where the circuit's\r\n      electrical ratings, pole configuration, transfer method, permitted interruption, generator interface,\r\n      control requirements and project approval conditions match the actual product configuration.\r\n    <\/p>\r\n\r\n    <p>\r\n      The standard product should <strong>not<\/strong> be presented as a dedicated runway-lighting,\r\n      navigation-system, CAT II\/CAT III, airfield-lighting powerhouse or other specialised aviation-safety\r\n      transfer solution without model-specific and project-specific verification.\r\n    <\/p>\r\n\r\n    <p>\r\n      Where a tender requires a larger integrated panel, dual-generator logic, bypass\/isolation equipment,\r\n      closed-transition operation, specialised redundancy or aviation-specific approvals, that requirement should\r\n      be treated as a separate engineered system rather than extending the claimed capability of the standard compact ATS.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"a-practical-four-step-airport-ats-decision\"><\/span>A Practical Four-Step Airport ATS Decision<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"leeyee-decision-list\">\r\n    <li>\r\n      <strong>Identify the exact load.<\/strong><br>\r\n      \u201cAirport lighting\u201d is too broad. State whether the circuit serves auxiliary lighting, equipment rooms,\r\n      emergency systems, airfield visual aids or another defined load.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Define the maximum acceptable interruption.<\/strong><br>\r\n      Determine the required system-level continuity before choosing the transfer method.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Check whether open transition is acceptable.<\/strong><br>\r\n      If the load cannot tolerate the interruption, a conventional open-transition ATS may not be the correct architecture.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Verify the proposed equipment against the full project specification.<\/strong><br>\r\n      Confirm ratings, poles, short-circuit coordination, generator logic, controls, monitoring, documentation,\r\n      standards and approval requirements before the equipment is approved.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <div class=\"leeyee-keyline\">\r\n    The correct airport transfer solution is not simply the ATS with the fastest switching number.\r\n    It is the power-transfer architecture that satisfies the load classification, source arrangement,\r\n    permitted interruption and approved project design.\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-cta\">\r\n    <h3>Need to Check Whether a Standard LEEYEE ATS Fits Your Airport Auxiliary Circuit?<\/h3>\r\n\r\n    <p>\r\n      Send the single-line diagram, load description, system voltage, current, pole requirement, normal and alternate\r\n      sources, permitted interruption, generator control requirements, required status signals and applicable project\r\n      specification. LEEYEE can use those details to determine whether the requirement is suitable for evaluation\r\n      within the standard compact open-transition ATS scope or should be treated as a specialised project solution.\r\n    <\/p>\r\n\r\n    <button\r\n      type=\"button\"\r\n      class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n      aria-label=\"Request ATS Selection Review\">\r\n      <span class=\"w-btn-label\">Request ATS Selection Review<\/span>\r\n    <\/button>\r\n  <\/section>\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 a normal automatic transfer switch be used for airport runway lighting?<\/h3>\r\n      <p>\r\n        It should not be assumed. FAA guidance demonstrates that defined airfield visual-aid systems can have\r\n        specific secondary-power and changeover requirements.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n        The applicable airport specification, aviation requirements and complete power architecture must be reviewed first.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Does a fast ATS automatically meet a one-second airport requirement?<\/h3>\r\n      <p>\r\n        No. A project may define performance for the complete secondary-power system rather than only the ATS\r\n        mechanism. Generator availability, source validation, programmed delays and transfer logic can all affect\r\n        the total result.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Is one second required for every airport ATS?<\/h3>\r\n      <p>\r\n        No. The one-second FAA provisions discussed here relate to defined Category II visual-aid applications,\r\n        and the Changi one-second figure is an airport-specific published condition during Category II low-visibility\r\n        operations.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n        Other airport systems and jurisdictions may use different requirements.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Is an airfield-lighting ATS the same as a compact ATS?<\/h3>\r\n      <p>\r\n        Not necessarily. Public airport technical specifications can describe complete ATS panels with generator\r\n        priority, timers, monitoring, metering and additional control functions.<sup><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n        A compact ATS should therefore be compared with the complete tender requirement rather than treated as a direct equivalent.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Can the LEEYEE compact ATS be considered for airport auxiliary power?<\/h3>\r\n      <p>\r\n        It may be considered where the actual low-voltage auxiliary circuit matches the ATS electrical ratings,\r\n        open-transition operating method, pole arrangement, control requirements and permitted interruption.\r\n        Final selection must still be confirmed from the project drawings and exact product documentation.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Can an ATS replace a UPS for an airport control load?<\/h3>\r\n      <p>\r\n        Not automatically. Open-transition transfer disconnects one source before connecting the other, so an\r\n        interruption occurs during transfer.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n        If the equipment cannot tolerate that interruption, the approved design may require another continuity solution.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Should an airport ATS use 3 poles or 4 poles?<\/h3>\r\n      <p>\r\n        Pole selection should not be based on the word \u201cairport\u201d or phase count alone. Neutral treatment, earthing\r\n        arrangement, generator configuration, protective scheme and the project single-line diagram must be reviewed.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Is IEC 60947-6-1 compliance enough for an airport project?<\/h3>\r\n      <p>\r\n        No. IEC 60947-6-1:2026 is the current IEC product standard for transfer switching equipment within its scope,\r\n        but project acceptance may also depend on aviation requirements, local electrical rules, consultant\r\n        specifications and model-specific documentation.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>What should I send when requesting an airport ATS quotation?<\/h3>\r\n      <p>\r\n        Send the circuit function, single-line diagram, voltage, frequency, phase and pole requirement, continuous\r\n        current, source arrangement, maximum permitted interruption, fault or upstream protection information,\r\n        generator-control requirements, remote signals, quantity and applicable approval documents.\r\n      <\/p>\r\n    <\/div>\r\n\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=\"leeyee-references\">\r\n    <li id=\"ref-1\">\r\n      <span class=\"leeyee-reference-label\">[1] Federal Aviation Administration (FAA).<\/span>\r\n      <a\r\n        href=\"https:\/\/www.faa.gov\/airports\/resources\/advisory_circulars\/index.cfm\/go\/document.current\/documentnumber\/150_5340-30\"\r\n        target=\"_blank\"\r\n        rel=\"noopener noreferrer\">\r\n        AC 150\/5340-30J \u2014 Design and Installation Details for Airport Visual Aids\r\n      <\/a>.\r\n      Active FAA advisory circular covering airport visual-aid installation, including secondary-power and\r\n      Category II changeover considerations for defined visual-aid systems.\r\n    <\/li>\r\n\r\n    <li id=\"ref-2\">\r\n      <span class=\"leeyee-reference-label\">[2] Civil Aviation Authority of Singapore (CAAS).<\/span>\r\n      <a\r\n        href=\"https:\/\/aim-sg.caas.gov.sg\/aim-content\/uploads\/aip\/2025-07-24\/final\/2024-03-21\/html\/eAIP\/AD-2.WSSS-en-GB.html\"\r\n        target=\"_blank\"\r\n        rel=\"noopener noreferrer\">\r\n        Singapore AIP \u2014 WSSS AD 2.15, Other Lighting, Secondary Power Supply\r\n      <\/a>.\r\n      Published Changi Airport information listing automatic standby generator power for airfield lighting and\r\n      a one-second switch-over during Category II low-visibility operations.\r\n    <\/li>\r\n\r\n    <li id=\"ref-3\">\r\n      <span class=\"leeyee-reference-label\">[3] International Electrotechnical Commission (IEC).<\/span>\r\n      <a\r\n        href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\"\r\n        target=\"_blank\"\r\n        rel=\"noopener noreferrer\">\r\n        IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment\r\n      <\/a>.\r\n      Edition 4.0, published 2 April 2026.\r\n    <\/li>\r\n\r\n    <li id=\"ref-4\">\r\n      <span class=\"leeyee-reference-label\">[4] Eaton.<\/span>\r\n      <a\r\n        href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\"\r\n        target=\"_blank\"\r\n        rel=\"noopener noreferrer\">\r\n        Automatic Transfer Switches (ATS) Fundamentals\r\n      <\/a>.\r\n      Technical overview explaining open-transition transfer as a break-before-make sequence.\r\n    <\/li>\r\n\r\n    <li id=\"ref-5\">\r\n      <span class=\"leeyee-reference-label\">[5] Clark International Airport Corporation.<\/span>\r\n      <a\r\n        href=\"https:\/\/ciac.gov.ph\/wp-content\/uploads\/2020\/09\/Technical-Specifications-AGLS-Upgrade-final-1-July-8-2020.pdf\"\r\n        target=\"_blank\"\r\n        rel=\"noopener noreferrer\">\r\n        Technical Specifications \u2014 Airfield Ground Lighting System Upgrade\r\n      <\/a>.\r\n      Public project specification containing a dedicated Dual Automatic Transfer Switch section and associated\r\n      generator, control, monitoring and panel requirements. This project example illustrates the need to verify\r\n      the complete airport tender specification rather than assuming one generic ATS configuration.\r\n    <\/li>\r\n  <\/ol>\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>Airport Backup Power \u00b7 ATS Engineering SelectionAn automatic transfer switch can be part of an airport backup-power system, but airport auxiliary power and aviation-critical power are not the same application. A compact open-transition ATS may be evaluated for suitable low-voltage auxiliary circuits, while airfield lighting and other aviation-critical systems can have much stricter requirements for&#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-31586","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>Airport Automatic Transfer Switch: Lighting &amp; Backup Power ATS Guide<\/title>\n<meta name=\"description\" content=\"Learn how to select an airport automatic transfer switch for auxiliary power, generator backup and lighting systems, including open-transition limits, transfer-time requirements, airfield lighting project considerations and LEEYEE compact ATS application boundaries.\" \/>\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\/airport-lighting-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Airport Automatic Transfer Switch: Lighting &amp; 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