{"id":20748,"date":"2026-07-10T10:38:51","date_gmt":"2026-07-10T08:38:51","guid":{"rendered":"https:\/\/icce.com\/?p=20748"},"modified":"2026-07-10T12:32:40","modified_gmt":"2026-07-10T10:32:40","slug":"forms-of-internal-separation-in-low-voltage-switchgear","status":"publish","type":"post","link":"https:\/\/icce.com\/de\/2026\/07\/10\/forms-of-internal-separation-in-low-voltage-switchgear\/","title":{"rendered":"Forms of Internal Separation in Low-Voltage Switchgear"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"20748\" class=\"elementor elementor-20748\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5314cbf8 ct-section-stretched elementor-section-full_width elementor-section-height-min-height elementor-section-items-top elementor-section-height-default\" data-id=\"5314cbf8\" data-element_type=\"section\" data-e-type=\"section\" 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class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Blog<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-d3876ef\" data-id=\"d3876ef\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-97d95c5 elementor-widget elementor-widget-spacer\" data-id=\"97d95c5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-027ca92 e-flex e-con-boxed e-con e-parent\" data-id=\"027ca92\" 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-fb53fcd elementor-flip-box--effect-fade elementor-widget elementor-widget-flip-box\" data-id=\"fb53fcd\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;none&quot;}\" data-widget_type=\"flip-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-flip-box\" tabindex=\"0\">\n\t\t\t<div class=\"elementor-flip-box__layer elementor-flip-box__front\">\n\t\t\t\t<div class=\"elementor-flip-box__layer__overlay\">\n\t\t\t\t\t<div class=\"elementor-flip-box__layer__inner\">\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t<h3 class=\"elementor-flip-box__layer__title\">\n\t\t\t\t\t\t\t\tForms of Internal Separation in Low-Voltage Switchgear\t\t\t\t\t\t\t<\/h3>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"elementor-flip-box__layer elementor-flip-box__back\">\n\t\t\t<div class=\"elementor-flip-box__layer__overlay\">\n\t\t\t\t<div class=\"elementor-flip-box__layer__inner\">\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-65b103b elementor-widget elementor-widget-post-info\" data-id=\"65b103b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-ca5c9d0 elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t<a href=\"https:\/\/icce.com\/de\/2026\/07\/10\/\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-calendar\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M12 192h424c6.6 0 12 5.4 12 12v260c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V204c0-6.6 5.4-12 12-12zm436-44v-36c0-26.5-21.5-48-48-48h-48V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H160V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H48C21.5 64 0 85.5 0 112v36c0 6.6 5.4 12 12 12h424c6.6 0 12-5.4 12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>Juli 10, 2026<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-8956b2d elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-clock\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm0 448c-110.5 0-200-89.5-200-200S145.5 56 256 56s200 89.5 200 200-89.5 200-200 200zm61.8-104.4l-84.9-61.7c-3.1-2.3-4.9-5.9-4.9-9.7V116c0-6.6 5.4-12 12-12h32c6.6 0 12 5.4 12 12v141.7l66.8 48.6c5.4 3.9 6.5 11.4 2.6 16.8L334.6 349c-3.9 5.3-11.4 6.5-16.8 2.6z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-time\">\n\t\t\t\t\t\t\t\t\t\t<time>10:38 a.m.<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\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<div class=\"elementor-element elementor-element-d81cc01 e-flex e-con-boxed e-con e-parent\" data-id=\"d81cc01\" 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-8274414 elementor-widget elementor-widget-heading\" data-id=\"8274414\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Practical Guide<\/h2>\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<div class=\"elementor-element elementor-element-10b20e0 e-flex e-con-boxed e-con e-parent\" data-id=\"10b20e0\" 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-4ee39cf elementor-widget elementor-widget-text-editor\" data-id=\"4ee39cf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>The form of internal separation you specify controls who can safely work on your switchboard while it stays energized. Choose wrong, and you are either overspending or creating risk.<\/em><\/p><p>When specifying a low-voltage switchgear assembly, most attention goes to rated current, short-circuit withstand, and protection degree. But there is another parameter that directly affects both operational safety and maintenance flexibility, which is the form of internal separation.<\/p><p>IEC 61439-2 defines four forms of internal separation: Form 1 through and Form 4, each with further subdivisions. These forms describe how the busbars, functional units, and cable termination compartments inside a switchboard are physically separated from each other.<\/p><p>It\u2019s not purely a technical choice. The choice determines what maintenance work can be performed. At the same time, adjacent circuits remain alive; how faults propagate within the assembly ultimately determines the operational downtime the installation will require over its lifetime.<\/p><p>This article explains each form, when to specify which, and the practical trade-offs involved..<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d2510a2 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"d2510a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&quot;],&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__d2510a2\" aria-expanded=\"true\" aria-label=\"Inhaltsverzeichnis \u00f6ffnen\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__d2510a2\" aria-expanded=\"true\" aria-label=\"Inhaltsverzeichnis schlie\u00dfen\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__d2510a2\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\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<div class=\"elementor-element elementor-element-91e4c8d e-flex e-con-boxed e-con e-parent\" data-id=\"91e4c8d\" 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-96402eb elementor-widget elementor-widget-html\" data-id=\"96402eb\" 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<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\">\n<title>SIVACON S8: Interactive System Overview<\/title>\n<style>\n  :root {\n    --orange: #E37B00;\n    --dark: #2B2D42;\n    --grey-bg: #F4F4F4;\n    --grey-text: #5A5A5A;\n  }\n  * { box-sizing: border-box; }\n  body {\n    margin: 0;\n    font-family: 'Open Sans', Helvetica, sans-serif;\n    background: var(--grey-bg);\n    color: var(--dark);\n    padding: 24px;\n  }\n  .wrap {\n    max-width: 1400px;\n    margin: 0 auto;\n  }\n  .header {\n    margin-bottom: 18px;\n  }\n  .eyebrow {\n    color: var(--orange);\n    font-weight: 700;\n    font-size: 12px;\n    letter-spacing: 1.5px;\n    text-transform: uppercase;\n    margin-bottom: 4px;\n  }\n  h1 {\n    font-size: 24px;\n    margin: 0 0 6px 0;\n    color: var(--dark);\n  }\n  .sub {\n    color: var(--grey-text);\n    font-size: 14px;\n    max-width: 720px;\n    line-height: 1.5;\n  }\n  .stage {\n    position: relative;\n    width: 100%;\n    border-radius: 6px;\n    overflow: hidden;\n    box-shadow: 0 4px 24px rgba(0,0,0,0.12);\n    background: #000;\n    margin-top: 20px;\n  }\n  .stage img {\n    display: block;\n    width: 100%;\n    height: auto;\n  }\n  .hotspot {\n    position: absolute;\n    top: 4%;\n    height: 92%;\n    border: 2px solid transparent;\n    cursor: pointer;\n    transition: background 0.15s ease, border-color 0.15s ease;\n  }\n  .hotspot:hover, .hotspot.active {\n    background: rgba(232, 119, 34, 0.22);\n    border-color: var(--orange);\n  }\n  .hotspot .marker {\n    position: absolute;\n    top: 8px;\n    left: 50%;\n    transform: translateX(-50%);\n    width: 26px;\n    height: 26px;\n    border-radius: 50%;\n    background: var(--orange);\n    color: white;\n    font-weight: 700;\n    font-size: 13px;\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    box-shadow: 0 2px 8px rgba(0,0,0,0.35);\n    opacity: 0.92;\n    pointer-events: none;\n  }\n  .hotspot.separation .marker {\n    background: var(--dark);\n  }\n\n  \/* Tooltip panel (fixed, shown below image) *\/\n  .info-panel {\n    margin-top: 18px;\n    background: white;\n    border-radius: 6px;\n    border-left: 4px solid var(--orange);\n    padding: 20px 24px;\n    min-height: 92px;\n    box-shadow: 0 2px 12px rgba(0,0,0,0.06);\n  }\n  .info-panel .tag {\n    display: inline-block;\n    font-size: 11px;\n    font-weight: 700;\n    letter-spacing: 1px;\n    text-transform: uppercase;\n    color: var(--orange);\n    background: rgba(232,119,34,0.1);\n    padding: 3px 9px;\n    border-radius: 3px;\n    margin-bottom: 8px;\n  }\n  .info-panel .tag.separation-tag {\n    color: var(--dark);\n    background: rgba(43,45,66,0.08);\n  }\n  .info-panel h3 {\n    margin: 0 0 8px 0;\n    font-size: 18px;\n    color: var(--dark);\n  }\n  .info-panel p {\n    margin: 0;\n    font-size: 14px;\n    line-height: 1.6;\n    color: var(--grey-text);\n  }\n  .info-panel .placeholder {\n    color: #B0B0B0;\n    font-style: italic;\n    font-size: 14px;\n  }\n\n  .legend {\n    display: flex;\n    gap: 24px;\n    margin-top: 14px;\n    font-size: 12px;\n    color: var(--grey-text);\n    flex-wrap: wrap;\n  }\n  .legend span {\n    display: inline-flex;\n    align-items: center;\n    gap: 6px;\n  }\n  .dot {\n    width: 12px; height: 12px; border-radius: 50%;\n  }\n  .dot.orange { background: var(--orange); }\n  .dot.dark { background: var(--dark); }\n\n  .footer-note {\n    margin-top: 22px;\n    font-size: 12px;\n    color: #999;\n    text-align: center;\n  }\n<\/style>\n<\/head>\n<body>\n<div class=\"wrap\">\n\n  <div class=\"header\">\n    <div class=\"eyebrow\">ICCE: Interactive Diagram<\/div>\n    <h1>SIVACON S8: Inside a Type-Tested System<\/h1>\n    <div class=\"sub\">\n      Hover over any section of the switchgear to see what it does. Orange markers indicate functional\n      compartments; dark markers indicate busbar\/riser sections that separate them. The physical basis\n      of internal separation forms defined in IEC 61439-2.\n    <\/div>\n  <\/div>\n\n  <div class=\"stage\" id=\"stage\">\n    <img decoding=\"async\" src=\"https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/sivacon-scaled.jpg\" alt=\"SIVACON S8 open system\" id=\"sivaconImg\">\n    <!-- Hotspots positioned by percentage over the image -->\n    <div class=\"hotspot\" data-id=\"incoming\" style=\"left:0%; width:9%;\"><div class=\"marker\">1<\/div><\/div>\n    <div class=\"hotspot\" data-id=\"protection\" style=\"left:9%; width:11%;\"><div class=\"marker\">2<\/div><\/div>\n    <div class=\"hotspot separation\" data-id=\"riser1\" style=\"left:20%; width:10%;\"><div class=\"marker\">\u00b7<\/div><\/div>\n    <div class=\"hotspot\" data-id=\"distribution\" style=\"left:30%; width:11%;\"><div class=\"marker\">3<\/div><\/div>\n    <div class=\"hotspot separation\" data-id=\"spare1\" style=\"left:41%; width:10%;\"><div class=\"marker\">\u00b7<\/div><\/div>\n    <div class=\"hotspot\" data-id=\"withdrawable\" style=\"left:51%; width:10.5%;\"><div class=\"marker\">4<\/div><\/div>\n    <div class=\"hotspot separation\" data-id=\"riser2\" style=\"left:61.5%; width:10%;\"><div class=\"marker\">\u00b7<\/div><\/div>\n    <div class=\"hotspot\" data-id=\"contactors\" style=\"left:71.5%; width:10.5%;\"><div class=\"marker\">5<\/div><\/div>\n    <div class=\"hotspot\" data-id=\"capacitor\" style=\"left:82%; width:18%;\"><div class=\"marker\">6<\/div><\/div>\n  <\/div>\n\n  <div class=\"legend\">\n    <span><span class=\"dot orange\"><\/span> Functional compartment (equipment)<\/span>\n    <span><span class=\"dot dark\"><\/span> Busbar \/ riser compartment (separation zone)<\/span>\n  <\/div>\n\n  <div class=\"info-panel\" id=\"infoPanel\">\n    <p class=\"placeholder\">Hover over a section above to see what it does.<\/p>\n  <\/div>\n\n  <div class=\"footer-note\">ICCE | Driven by experience. Inspired to excel. \u00b7 www.icce.com<\/div>\n\n<\/div>\n\n<script>\n  const data = {\n    incoming: {\n      tag: \"Functional Unit\",\n      title: \"Incoming Feeder \/ Main Protection\",\n      text: \"Main air circuit breaker (ACB) with digital protection relay and local control panel (CubicleBUS interface). This is the entry point for incoming power, where the main protective device monitors and, if needed, interrupts the full system current.\"\n    },\n    protection: {\n      tag: \"Functional Unit\",\n      title: \"Protection Relays & Withdrawable Feeders\",\n      text: \"Digital protection relays (top) monitor current, voltage, and fault conditions for downstream circuits. Below, withdrawable feeder units allow individual circuits to be isolated and pulled out for maintenance without shutting down adjacent units, a key benefit of Form 3\/4 separation.\"\n    },\n    riser1: {\n      tag: \"Separation Zone\",\n      title: \"Vertical Busbar Compartment\",\n      text: \"This section carries the vertical distribution busbars connecting cubicles. Keeping it physically separated from functional units is what allows technicians to work on one feeder without exposure to the main power path. The essence of internal separation under IEC 61439-2.\"\n    },\n    distribution: {\n      tag: \"Functional Unit\",\n      title: \"Fixed-Mounted Distribution & Terminals\",\n      text: \"Molded-case circuit breakers, terminal blocks, and relay racks in a fixed-mounted configuration. Used for circuits where frequent replacement is not required, balancing cost efficiency with reliable protection.\"\n    },\n    spare1: {\n      tag: \"Separation Zone\",\n      title: \"Cable \/ Spare Compartment\",\n      text: \"Reserved space for cable routing and future expansion. Keeping cable runs in a dedicated compartment, separate from live functional units, is part of what allows higher separation forms like Form 4b.\"\n    },\n    withdrawable: {\n      tag: \"Functional Unit\",\n      title: \"Withdrawable Motor Feeder Units\",\n      text: \"A stack of withdrawable drawer units, each housing a motor starter or feeder. Withdrawable design allows a unit to be disconnected and removed for service in minutes, without de-energizing neighboring feeders. It is critical for continuous industrial operations.\"\n    },\n    riser2: {\n      tag: \"Separation Zone\",\n      title: \"Busbar Riser Compartment\",\n      text: \"A second vertical riser, isolating the busbar run between the withdrawable feeder section and the motor contactor section. Each riser like this is a physical fault barrier, containing an arc event to its own compartment.\"\n    },\n    contactors: {\n      tag: \"Functional Unit\",\n      title: \"Motor Contactor Section (SIRIUS)\",\n      text: \"A row of Siemens SIRIUS contactors, used for direct motor control and switching. Positioned in its own compartment, isolated from adjacent sections, and consistent with Form 4 separation, where every functional unit is independently accessible.\"\n    },\n    capacitor: {\n      tag: \"Functional Unit\",\n      title: \"Power Factor Correction \/ Capacitor Bank\",\n      text: \"Capacitor bank with associated switching contactors, used to correct power factor and reduce reactive power drawn from the grid. Isolated in its own compartment due to the distinct electrical characteristics and maintenance needs of capacitor equipment.\"\n    }\n  };\n\n  const panel = document.getElementById('infoPanel');\n  const hotspots = document.querySelectorAll('.hotspot');\n\n  hotspots.forEach(h => {\n    h.addEventListener('mouseenter', () => {\n      hotspots.forEach(x => x.classList.remove('active'));\n      h.classList.add('active');\n      const d = data[h.dataset.id];\n      const tagClass = h.classList.contains('separation') ? 'tag separation-tag' : 'tag';\n      panel.innerHTML = `<div class=\"${tagClass}\">${d.tag}<\/div><h3>${d.title}<\/h3><p>${d.text}<\/p>`;\n    });\n  });\n\n  document.getElementById('stage').addEventListener('mouseleave', () => {\n    hotspots.forEach(x => x.classList.remove('active'));\n  });\n<\/script>\n\n<\/body>\n<\/html>\n\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<div class=\"elementor-element elementor-element-e7d32ad e-flex e-con-boxed e-con e-parent\" data-id=\"e7d32ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-566d619 e-flex e-con-boxed e-con e-child\" data-id=\"566d619\" 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-9a14513 elementor-widget elementor-widget-heading\" data-id=\"9a14513\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is internal separation?<\/h2>\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\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-09da772 e-flex e-con-boxed e-con e-parent\" data-id=\"09da772\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-e9953f4 e-con-full e-flex e-con e-child\" data-id=\"e9953f4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9d6f424 elementor-widget elementor-widget-text-editor\" data-id=\"9d6f424\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Internal separation refers to the physical subdivision of a switchgear assembly into distinct zones using metallic or non-metallic barriers and partitions. The goal is threefold: to protect personnel from contact with live parts during maintenance, to limit the propagation of internal faults (including arc faults) between functional units, and to allow intervention on one part of the switchboard without de-energizing the entire assembly.<\/p><p><a href=\"https:\/\/icce.com\/2025\/12\/02\/iec-61439-from-compliance-to-performance\/\">IEC 61439-2<\/a> defines the rules for internal separation. According to the standard, three elements can be separated from each other:<\/p><p><strong>Busbars<\/strong>: The main power distribution conductors running through the assembly.<\/p><p><strong>Functional units<\/strong>: The individual circuit modules (breakers, contactors, starters, fuse switches) that connect to the busbars.<\/p><p><strong>Terminals for external conductors<\/strong>: The cable connection points where incoming and outgoing cables are terminated.<\/p><p>The form is defined by the decision on how these three elements are separated.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9e9e65e e-con-full e-flex e-con e-child\" data-id=\"9e9e65e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8d3c4c9 elementor-widget elementor-widget-image\" data-id=\"8d3c4c9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1920\" src=\"https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-scaled.jpg\" class=\"attachment-full size-full wp-image-20752\" alt=\"\" srcset=\"https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-scaled.jpg 2560w, https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-300x225.jpg 300w, https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-1024x768.jpg 1024w, https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-768x576.jpg 768w, https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-1536x1152.jpg 1536w, https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-2048x1536.jpg 2048w, https:\/\/icce.com\/wp-content\/uploads\/2026\/07\/IMG_8252-16x12.jpg 16w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\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<div class=\"elementor-element elementor-element-3bac9bd e-flex e-con-boxed e-con e-parent\" data-id=\"3bac9bd\" 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-4cde2ca elementor-widget elementor-widget-heading\" data-id=\"4cde2ca\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The four forms of separation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e4a24d1 elementor-widget elementor-widget-text-editor\" data-id=\"e4a24d1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4>Form 1: There is no internal separation<\/h4>\n<p>This is the simplest arrangement. There are no barriers or partitions inside the assembly. Busbars, functional units, and terminals all share the same space. Any work inside the switchboard requires complete de-energization.<\/p>\n<p>Form 1 is appropriate for small distribution boards and applications with sporadic maintenance, where a complete shutdown is acceptable. This is the most economical option with the most compact footprint.<\/p>\n<h4>Form 2: Separation of busbars from functional units<\/h4>\n<p>Form 2 introduces the first level of separation, where the busbars are physically separated from the functional units.<\/p>\n<p><strong>Form 2a: <\/strong>Busbars are separated from functional units, but the terminals for external conductors are not separated from the busbars. Separation is typically achieved by insulated coverings.<\/p>\n<p><strong>Form 2b: <\/strong>Busbars are separated from functional units, and terminals for external conductors are also separated from the busbars. This is achieved using rigid metallic or non-metallic barriers.<\/p>\n<p>Form 2 allows basic maintenance on functional units without direct exposure to live busbars. However, functional units are not separated. They are working on one unit that still presents a risk to adjacent units.<\/p>\n<h4>Form 3: Separation of functional units from each other<\/h4>\n<p>Form 3 adds a critical capability: individual functional units are separated from each other, in addition to the busbar separation already present in Form 2.<\/p>\n<p><strong>Form 3a: <\/strong>Busbars are separated from functional units. Functional units are separated from each other. But terminals for external conductors are not separated from the busbars. They share a common cable compartment.<\/p>\n<p><strong>Form 3b: <\/strong>Busbars are separated from functional units. Functional units are separated from each other. Terminals are separated from the busbars. However, terminals are in the same compartment as their associated functional unit.<\/p>\n<p>Form 3 is the standard choice for industrial main distribution boards, power control centers, and motor control centers where individual feeders need to be maintained while adjacent feeders remain in service. Form 3b is widely considered the minimum specification for any installation with significant downtime costs.<\/p>\n<h4>Form 4: Complete compartmentalization<\/h4>\n<p>Form 4 provides the highest level of internal separation. Every functional unit, every terminal compartment, and the busbars are all physically isolated from each other.<\/p>\n<p><strong>Form 4a: <\/strong>Busbars are separated from functional units. Functional units are separated from each other. Terminals for external conductors are in their own compartments. However, these compartments are integrated with the functional unit they serve (typically sharing a door or access panel).<\/p>\n<p><strong>Form 4b: <\/strong>Busbars are separated from functional units. Functional units are separated from each other. Terminals for external conductors are completely separate in individual compartments. Each has its own access point, physically independent from the functional unit compartment.<\/p>\n<p>Form 4b has the maximum achievable separation. A maintenance technician can access and work on any individual functional unit or cable termination while every other part of the switchboard remains fully energized and protected. This is essential for critical installations where any downtime is unacceptable. These applications could be data centers, hospitals, process plants, and critical port infrastructure.<\/p>\t\t\t\t\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<div class=\"elementor-element elementor-element-ac7e118 e-flex e-con-boxed e-con e-parent\" data-id=\"ac7e118\" 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-f229223 elementor-widget elementor-widget-html\" data-id=\"f229223\" 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<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\">\n<title>Forms of Internal Separation according to IEC 61439-2<\/title>\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Open+Sans:wght@400;600;700&display=swap\" rel=\"stylesheet\">\n<style>\n  :root {\n    --orange: #E37B00;\n    --dark: #2B2D42;\n    --grey-bg: #F4F4F4;\n    --grey-text: #5A5A5A;\n    --busbar: #2B2D42;\n    --unit: #E37B00;\n    --terminal: #4A90A4;\n    --panel-line: #999999;\n  }\n  * { box-sizing: border-box; }\n  body {\n    margin: 0;\n    font-family: 'Open Sans', Arial, Helvetica, sans-serif;\n    background: var(--grey-bg);\n    color: var(--dark);\n    padding: 24px;\n  }\n  .wrap { max-width: 1100px; margin: 0 auto; }\n  .eyebrow {\n    color: var(--orange); font-weight: 700; font-size: 12px;\n    letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 4px;\n  }\n  h1 { font-size: 24px; margin: 0 0 6px 0; }\n  .sub { color: var(--grey-text); font-size: 14px; max-width: 720px; line-height: 1.5; margin-bottom: 20px; }\n\n  .selector {\n    display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px;\n  }\n  .form-btn {\n    padding: 10px 16px; border-radius: 5px; border: 1.5px solid #D8D8D8;\n    background: white; color: var(--dark); font-weight: 700; font-size: 13px;\n    cursor: pointer; transition: all 0.15s ease;\n  }\n  .form-btn:hover { border-color: var(--orange); }\n  .form-btn.active {\n    background: var(--orange); border-color: var(--orange); color: white;\n  }\n\n  .main-grid {\n    display: grid; grid-template-columns: 1.15fr 1fr; gap: 28px;\n  }\n  @media (max-width: 800px) { .main-grid { grid-template-columns: 1fr; } }\n\n  .diagram-card {\n    background: white; border-radius: 6px; padding: 20px;\n    box-shadow: 0 2px 12px rgba(0,0,0,0.06);\n  }\n\n  .legend { display: flex; gap: 18px; margin-top: 14px; font-size: 12px; color: var(--grey-text); flex-wrap: wrap; }\n  .legend span { display: inline-flex; align-items: center; gap: 6px; }\n  .sw { width: 14px; height: 14px; border-radius: 2px; }\n\n  .info-card {\n    background: white; border-radius: 6px; padding: 22px 24px;\n    box-shadow: 0 2px 12px rgba(0,0,0,0.06);\n    border-left: 4px solid var(--orange);\n  }\n  .info-card .form-name { font-size: 20px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }\n  .info-card .form-sub { font-size: 12px; color: var(--orange); font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase; margin-bottom: 14px; }\n  .checklist { list-style: none; padding: 0; margin: 0 0 14px 0; }\n  .checklist li {\n    display: flex; align-items: flex-start; gap: 10px; font-size: 13.5px; color: var(--dark);\n    padding: 7px 0; border-bottom: 1px solid #F0F0F0; line-height: 1.4;\n  }\n  .checklist li:last-child { border-bottom: none; }\n  .checkmark { flex-shrink: 0; width: 18px; height: 18px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; margin-top: 1px; }\n  .checkmark.yes { background: rgba(76,175,80,0.15); color: #2E7D32; }\n  .checkmark.no { background: rgba(150,150,150,0.15); color: #888; }\n  .use-case { font-size: 13px; color: var(--grey-text); line-height: 1.6; padding-top: 6px; }\n  .use-case b { color: var(--dark); }\n\n  .footer-note { margin-top: 22px; font-size: 12px; color: #999; text-align: center; }\n<\/style>\n<\/head>\n<body>\n<div class=\"wrap\">\n\n  <div class=\"eyebrow\">ICCE: Technical Reference<\/div>\n  <h1>Forms of Internal Separation<\/h1>\n  <div class=\"sub\">\n    IEC 61439-2 defines seven configurations for separating busbars, functional units, and cable terminals\n    inside a switchgear assembly. Select a form to see what is separated from what.\n  <\/div>\n\n  <div class=\"selector\" id=\"selector\"><\/div>\n\n  <div class=\"main-grid\">\n    <div class=\"diagram-card\">\n      <svg id=\"diagram\" viewBox=\"0 0 480 400\" style=\"width:100%; height:auto;\"><\/svg>\n      <div class=\"legend\">\n        <span><span class=\"sw\" style=\"background:var(--busbar)\"><\/span> Busbars<\/span>\n        <span><span class=\"sw\" style=\"background:var(--unit)\"><\/span> Functional units<\/span>\n        <span><span class=\"sw\" style=\"background:var(--terminal)\"><\/span> Terminals<\/span>\n      <\/div>\n    <\/div>\n\n    <div class=\"info-card\" id=\"infoCard\"><\/div>\n  <\/div>\n\n  <div class=\"footer-note\">Based on IEC 61439-2 | Original ICCE schematic, not a reproduction of manufacturer material.<\/div>\n<\/div>\n\n<script>\nconst forms = {\n  \"1\": {\n    label: \"Form 1\",\n    sub: \"No internal separation\",\n    busbarSep: false, unitsSep: false, terminalsSepFromBus: false, terminalsSepFromUnits: false,\n    checklist: [\n      [\"Busbars separated from functional units\", false],\n      [\"Functional units separated from each other\", false],\n      [\"Terminals separated from busbars\", false],\n      [\"Terminals separated from other units' terminals\", false],\n    ],\n    use: \"Small distribution boards and low-complexity applications where infrequent maintenance and full shutdown are acceptable. Lowest cost, most compact.\"\n  },\n  \"2a\": {\n    label: \"Form 2a\",\n    sub: \"Busbars separated from functional units\",\n    busbarSep: true, unitsSep: false, terminalsSepFromBus: false, terminalsSepFromUnits: false,\n    checklist: [\n      [\"Busbars separated from functional units\", true],\n      [\"Functional units separated from each other\", false],\n      [\"Terminals separated from busbars\", false],\n      [\"Terminals separated from other units' terminals\", false],\n    ],\n    use: \"Basic maintenance access to functional units without direct busbar exposure. Terminals share space with busbars.\"\n  },\n  \"2b\": {\n    label: \"Form 2b\",\n    sub: \"Busbars and terminals separated from functional units\",\n    busbarSep: true, unitsSep: false, terminalsSepFromBus: true, terminalsSepFromUnits: false,\n    checklist: [\n      [\"Busbars separated from functional units\", true],\n      [\"Functional units separated from each other\", false],\n      [\"Terminals separated from busbars\", true],\n      [\"Terminals separated from other units' terminals\", false],\n    ],\n    use: \"Same as Form 2a, with terminals also isolated from busbars via rigid barriers. Functional units still share space with each other.\"\n  },\n  \"3a\": {\n    label: \"Form 3a\",\n    sub: \"Busbars and functional units fully separated\",\n    busbarSep: true, unitsSep: true, terminalsSepFromBus: false, terminalsSepFromUnits: false,\n    checklist: [\n      [\"Busbars separated from functional units\", true],\n      [\"Functional units separated from each other\", true],\n      [\"Terminals separated from busbars\", false],\n      [\"Terminals separated from other units' terminals\", false],\n    ],\n    use: \"Individual feeders can be serviced independently. Terminals share a common cable compartment across units.\"\n  },\n  \"3b\": {\n    label: \"Form 3b\",\n    sub: \"Industry standard minimum for critical installations\",\n    busbarSep: true, unitsSep: true, terminalsSepFromBus: true, terminalsSepFromUnits: false,\n    checklist: [\n      [\"Busbars separated from functional units\", true],\n      [\"Functional units separated from each other\", true],\n      [\"Terminals separated from busbars\", true],\n      [\"Terminals separated from other units' terminals\", false],\n    ],\n    use: \"Widely considered the minimum specification where downtime costs are significant. Terminals stay grouped with their own functional unit.\"\n  },\n  \"4a\": {\n    label: \"Form 4a\",\n    sub: \"Full separation, terminals share unit compartment\",\n    busbarSep: true, unitsSep: true, terminalsSepFromBus: true, terminalsSepFromUnits: true, sharedDoor: true,\n    checklist: [\n      [\"Busbars separated from functional units\", true],\n      [\"Functional units separated from each other\", true],\n      [\"Terminals separated from busbars\", true],\n      [\"Terminals separated from other units' terminals\", true],\n    ],\n    use: \"Terminal compartments are separated but integrated with their functional unit, typically behind a shared access door.\"\n  },\n  \"4b\": {\n    label: \"Form 4b\",\n    sub: \"Maximum separation - every element independently isolated\",\n    busbarSep: true, unitsSep: true, terminalsSepFromBus: true, terminalsSepFromUnits: true, sharedDoor: false,\n    checklist: [\n      [\"Busbars separated from functional units\", true],\n      [\"Functional units separated from each other\", true],\n      [\"Terminals separated from busbars\", true],\n      [\"Terminals separated from other units' terminals\", true],\n    ],\n    use: \"Maximum achievable separation. Any functional unit or termination can be accessed while the rest of the switchboard stays energized. Standard for data centers, hospitals, and critical infrastructure. SIVACON S8 supports separation up to Form 4b.\"\n  },\n};\n\nconst order = [\"1\",\"2a\",\"2b\",\"3a\",\"3b\",\"4a\",\"4b\"];\nconst selector = document.getElementById('selector');\norder.forEach(key => {\n  const btn = document.createElement('button');\n  btn.className = 'form-btn';\n  btn.textContent = 'Form ' + key;\n  btn.dataset.key = key;\n  btn.addEventListener('click', () => render(key));\n  selector.appendChild(btn);\n});\n\nfunction drawDiagram(f) {\n  const W = 480, H = 400;\n  const encX = 30, encY = 30, encW = 420, encH = 340;\n  const busY = encY, busH = 55;\n  const bodyY = busY + busH, bodyH = 210;\n  const termY = bodyY + bodyH, termH = 75;\n\n  let svg = '';\n  svg += `<rect x=\"${encX}\" y=\"${encY}\" width=\"${encW}\" height=\"${encH}\" fill=\"none\" stroke=\"#333\" stroke-width=\"3\" rx=\"2\"\/>`;\n\n  svg += `<rect x=\"${encX+4}\" y=\"${busY+4}\" width=\"${encW-8}\" height=\"${busH-8}\" fill=\"var(--busbar)\" opacity=\"0.85\" rx=\"1\"\/>`;\n  svg += `<text x=\"${encX+encW\/2}\" y=\"${busY+busH\/2+5}\" text-anchor=\"middle\" fill=\"white\" font-size=\"14\" font-weight=\"700\">BUSBARS<\/text>`;\n\n  if (f.busbarSep) {\n    svg += `<rect x=\"${encX+4}\" y=\"${bodyY}\" width=\"${encW-8}\" height=\"6\" fill=\"#333\"\/>`;\n  } else {\n    svg += `<line x1=\"${encX+4}\" y1=\"${bodyY}\" x2=\"${encX+encW-4}\" y2=\"${bodyY}\" stroke=\"#CCC\" stroke-width=\"2\" stroke-dasharray=\"6,4\"\/>`;\n  }\n\n  const nUnits = 3;\n  const unitGap = f.unitsSep ? 8 : 0;\n  const totalGap = unitGap * (nUnits - 1);\n  const unitW = (encW - 8 - totalGap) \/ nUnits;\n  for (let i = 0; i < nUnits; i++) {\n    const ux = encX + 4 + i * (unitW + unitGap);\n    svg += `<rect x=\"${ux}\" y=\"${bodyY+6}\" width=\"${unitW}\" height=\"${bodyH-12}\" fill=\"var(--unit)\" opacity=\"0.85\" rx=\"1\"\/>`;\n    if (i === 1) {\n      svg += `<text x=\"${ux+unitW\/2}\" y=\"${bodyY+bodyH\/2}\" text-anchor=\"middle\" fill=\"white\" font-size=\"12\" font-weight=\"700\">UNIT ${i+1}<\/text>`;\n    } else {\n      svg += `<text x=\"${ux+unitW\/2}\" y=\"${bodyY+bodyH\/2}\" text-anchor=\"middle\" fill=\"white\" font-size=\"12\" font-weight=\"700\">UNIT ${i+1}<\/text>`;\n    }\n    if (!f.unitsSep && i < nUnits - 1) {\n      svg += `<line x1=\"${ux+unitW}\" y1=\"${bodyY+10}\" x2=\"${ux+unitW}\" y2=\"${bodyY+bodyH-10}\" stroke=\"white\" stroke-width=\"1\" stroke-dasharray=\"4,3\" opacity=\"0.6\"\/>`;\n    }\n  }\n\n  if (f.terminalsSepFromBus) {\n    svg += `<rect x=\"${encX+4}\" y=\"${termY}\" width=\"${encW-8}\" height=\"6\" fill=\"#333\"\/>`;\n  } else {\n    svg += `<line x1=\"${encX+4}\" y1=\"${termY}\" x2=\"${encX+encW-4}\" y2=\"${termY}\" stroke=\"#CCC\" stroke-width=\"2\" stroke-dasharray=\"6,4\"\/>`;\n  }\n\n  const termGap = f.terminalsSepFromUnits ? 8 : 0;\n  const termTotalGap = termGap * (nUnits - 1);\n  const termW = (encW - 8 - termTotalGap) \/ nUnits;\n  for (let i = 0; i < nUnits; i++) {\n    const tx = encX + 4 + i * (termW + termGap);\n    svg += `<rect x=\"${tx}\" y=\"${termY+6}\" width=\"${termW}\" height=\"${termH-12}\" fill=\"var(--terminal)\" opacity=\"0.85\" rx=\"1\"\/>`;\n    svg += `<text x=\"${tx+termW\/2}\" y=\"${termY+termH\/2+4}\" text-anchor=\"middle\" fill=\"white\" font-size=\"10.5\" font-weight=\"700\">TERM ${i+1}<\/text>`;\n    if (!f.terminalsSepFromUnits && i < nUnits - 1) {\n      svg += `<line x1=\"${tx+termW}\" y1=\"${termY+10}\" x2=\"${tx+termW}\" y2=\"${termY+termH-10}\" stroke=\"white\" stroke-width=\"1\" stroke-dasharray=\"4,3\" opacity=\"0.6\"\/>`;\n    }\n  }\n\n  if (f.sharedDoor) {\n    svg += `<rect x=\"${encX+4}\" y=\"${bodyY+bodyH-2}\" width=\"${encW-8}\" height=\"4\" fill=\"none\" stroke=\"#333\" stroke-width=\"1.5\" stroke-dasharray=\"3,3\"\/>`;\n  }\n\n  return `<svg id=\"diagram\" viewBox=\"0 0 ${W} ${H}\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:100%;height:auto;\">${svg}<\/svg>`;\n}\n\nfunction render(key) {\n  const f = forms[key];\n  document.querySelectorAll('.form-btn').forEach(b => b.classList.toggle('active', b.dataset.key === key));\n\n  document.getElementById('diagram').outerHTML = drawDiagram(f);\n\n  const checklistHTML = f.checklist.map(([label, val]) => `\n    <li>\n      <span class=\"checkmark ${val ? 'yes':'no'}\">${val ? '&#10003;' : '&#8211;'}<\/span>\n      <span>${label}<\/span>\n    <\/li>\n  `).join('');\n\n  document.getElementById('infoCard').innerHTML = `\n    <div class=\"form-name\">${f.label}<\/div>\n    <div class=\"form-sub\">${f.sub}<\/div>\n    <ul class=\"checklist\">${checklistHTML}<\/ul>\n    <div class=\"use-case\"><b>Typical use:<\/b> ${f.use}<\/div>\n  `;\n}\n\nrender(\"1\");\n<\/script>\n<\/body>\n<\/html>\n\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<div class=\"elementor-element elementor-element-47efd18 e-flex e-con-boxed e-con e-parent\" data-id=\"47efd18\" 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-3cb5ec2 elementor-widget elementor-widget-heading\" data-id=\"3cb5ec2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">How to choose the right form<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-90b1e92 elementor-widget elementor-widget-text-editor\" data-id=\"90b1e92\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The form specification should be driven by the operational requirements of the installation, not by habit or default.<\/p>\n<p>Several key factors need to be considered:<\/p>\n<p><strong>Will maintenance be performed while the switchboard is energized? <\/strong>If the answer is positive, Form 3 minimum. If individual feeders need to be serviced independently, Form 3b or Form 4.<\/p>\n<p><strong>Is there a sector-specific requirement? <\/strong>Some industries effectively mandate higher forms. Medical facilities (IEC 60364-7-710), data centers (Tier III and Tier IV), and critical infrastructure often require Form 4 on the main distribution.<\/p>\n<p><strong>What is the cost of downtime? <\/strong>For installations where an unplanned shutdown costs tens of thousands of euros per hour, the additional cost of Form 4 pays for itself quickly. For non-critical applications where scheduled shutdowns are acceptable, Form 2 or Form 3a may be sufficient.<\/p>\n<p><strong>What are the available space constraints? <\/strong>Higher forms of separation increase the switchboard&#8217;s physical depth and width. A Form 4b panel can be significantly deeper than a Form 1 panel of the same electrical capacity. Confirm that the electrical room or E-House can accommodate the footprint before specifying.<\/p>\n<p><strong>Is arc fault containment a separate requirement? <\/strong>Forms of separation and arc fault ratings are independent properties. A Form 4b switchboard is not automatically arc-fault rated. Arc-fault containment is addressed in IEC\/TR 61641 and requires separate testing and verification. Both parameters should be specified independently.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-881ce22 elementor-widget elementor-widget-text-editor\" data-id=\"881ce22\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The compact footprint of an E-House is also an advantage in constrained spaces. All equipment is arranged in an optimized layout within a defined steel frame, with everything from busbar support to cable entry points engineered for that specific configuration.\u00a0<\/p><p><strong>Where conventional wins on space:<\/strong> If you are designing a new facility from scratch with ample floor area, an integrated electrical room gives you more freedom on dimensions. E-Houses can be constrained by transport logistics. Road-transportable units are typically limited to widths of around 3-4 meters (depending on the region), though multi-module configurations can extend this.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fa83918 elementor-widget elementor-widget-heading\" data-id=\"fa83918\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Common specification mistakes<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7345a81 elementor-widget elementor-widget-text-editor\" data-id=\"7345a81\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Specifying Form 4b on every project regardless of need. <\/strong>Form 4b can significantly increase the cost of a panel, footprint, and lead time compared to Form 1. This is over-engineering for the installations where a complete shutdown for maintenance is acceptable.<\/p>\n<p><strong>Specifying \u201cForm 4\u201d without the suffix. <\/strong>The difference between Form 4a and Form 4b has real cost and construction implications. Always specify the complete designation.<\/p>\n<p><strong>Confusing the form of separation with IP rating. <\/strong>Internal separation (Form) and external ingress protection (IP) are independent parameters. A switchboard can be IP54 externally while being Form 1 internally. Both must be specified.<\/p>\n<p><strong>Confusing the form of separation with arc fault containment. <\/strong>A Form 4b switchboard provides excellent compartmentalization, but this does not mean it will contain an internal arc fault. Arc fault withstand capability per IEC\/TR 61641 is a separate verification that must be specified and tested independently.<\/p>\n<p><strong>Specifying Form 1 and then requesting live maintenance access. <\/strong>The construction does not support it. Either change the form specification or change the maintenance strategy.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f5fafd elementor-widget elementor-widget-heading\" data-id=\"6f5fafd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/icce.com\/sivacon-s8-ensure-future-ready-power\/\">SIVACON S8: internal separation up to Form 4b<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-94110d7 elementor-widget elementor-widget-text-editor\" data-id=\"94110d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>SIVACON S8 is a type-tested switchgear system that supports internal separation up to Form 4b across all mounting designs. These designs include options such as withdrawable, fixed-mounted compartment doors, and plug-in in-line configurations.<\/p>\n<p>The system achieves Form 4b through a combination of type-tested standard modules, add-on compartmentalization modules, and a patented connection terminal design that places cable terminations in a physically separate cable connection compartment. The vertical distribution busbars are covered to IP2X (test finger-proof), and phase separation is available as an option.<\/p>\n<p>Because every SIVACON S8 configuration has been type-tested under IEC 61439-2, the form of separation is not just a design intent. The form of separation is a verified, documented property of the assembly. This is the major difference between a type-tested system, where separation has been physically validated, and a custom-built panel, where separation relies on the builder&#8217;s interpretation of the standard.<\/p>\n<p>For installations that also require arc fault protection, SIVACON S8 has been tested according to IEC\/TR 61641 with arc-resistant design, pressure relief systems, and metal-clad compartmentalization, providing both Form 4b separation and arc fault containment in a single system.<\/p>\n<p>A recent example from our own production: a SIVACON S8 system for an industrial compressor station, configured with Form 4b internal separation, Extended Arc Fault Protection (Class C), and 50 kA short-circuit withstand. The dual MCC configuration (400 A normal load \/ 200 A essential load) combines withdrawable design for main drives and incoming feeders with fixed-mounted sections for smaller loads, demonstrating how the form of separation integrates with the broader system design rather than existing as an isolated specification.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-feb040d elementor-widget elementor-widget-heading\" data-id=\"feb040d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">You might find interesting:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4981b2e elementor-widget elementor-widget-ucaddon_post_list\" data-id=\"4981b2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"ucaddon_post_list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n<!-- start Post List -->\n\t\t<link id='font-awesome-css' href='https:\/\/icce.com\/wp-content\/plugins\/unlimited-elements-for-elementor-premium\/assets_libraries\/font-awesome6\/fontawesome-all.min.css' type='text\/css' rel='stylesheet' >\n\t\t<link id='font-awesome-4-shim-css' href='https:\/\/icce.com\/wp-content\/plugins\/unlimited-elements-for-elementor-premium\/assets_libraries\/font-awesome6\/fontawesome-v4-shims.min.css' type='text\/css' rel='stylesheet' >\n\n<style>\/* widget: Post List *\/\n\n\r\n@keyframes uc_post_list_elementor_4981b2e__item-animation {\r\n  0% {\r\n            transform:scale(0.7);\r\n        \t        \tfilter: blur(10px);\r\n\t\t\t\r\n    \t    opacity: 0;\r\n  }\r\n  100% {\r\n            transform:scale(1);\r\n        \t            filter: blur(0px);\r\n            \r\n    \t\topacity: 1;\r\n  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12px;\n}\n\n#uc_post_list_elementor_4981b2e .uc_post_list_content\n{\n  display:flex;\n  flex-direction:column;\n  flex:1;\n}\n\n#uc_post_list_elementor_4981b2e .uc_more_btn{\n\n  text-align:center;\n  text-decoration:none;\n  transition:0.3s;\n}\n\n#uc_post_list_elementor_4981b2e .button-on-side\n{\n  display:flex;\n  align-items:center;\n}\n\n\n.ue-grid-item-category a\n{\n  display:inline-block;\n  font-size:10px;\n  text-transform:uppercase;\n}\n\n#uc_post_list_elementor_4981b2e .ue-meta-data\n{\n  \n  display:flex;\n\n  flex-wrap: wrap;\n  line-height:1em;\n}\n\n#uc_post_list_elementor_4981b2e .ue-grid-item-meta-data\n{\n      display:inline-flex;\n      align-items:center;\n}\n\n.ue-grid-item-meta-data\n{\n  font-size:12px;\n}\n\n#uc_post_list_elementor_4981b2e .ue-grid-item-meta-data-icon\n{\n  line-height:1em;\n}\n\n#uc_post_list_elementor_4981b2e .ue-grid-item-meta-data-icon svg\n{\n  width:1em;\n  height:1em;\n}\n\n\n\n#uc_post_list_elementor_4981b2e .ue-debug-meta\n{\n  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Switchgear according to IEC\" width=\"300\" height=\"300\">\n        \t\n        \n      <\/a>\n    <\/div>\n  \t\t\n  \n    <div class=\"uc_post_list_content\">\n      <div class=\"uc_post_list_content_inside\">\n        \n                        \n         <div class=\"uc_post_list_title\"><a target=\"_self\" href=\"https:\/\/icce.com\/de\/2026\/07\/10\/forms-of-internal-separation-in-low-voltage-switchgear\/\" title=\"Forms of Internal Separation in Low-Voltage Switchgear\">Forms of Internal Separation in Low-Voltage Switchgear<\/a><\/div>\t\n         \n        <div class=\"ue-meta-data\">\n                                               \n            \n          \n                        \n            \n                        \n                        \n            \n              \n          <\/div>         \n                \n         <div class=\"uc_post_content\">The form of internal separation you specify controls who can safely work on your switchboard while it...<\/div>      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CONVENTIONAL ELECTRICAL ROOMS<\/a><\/div>\t\n         \n        <div class=\"ue-meta-data\">\n                                               \n            \n          \n                        \n            \n                        \n                        \n            \n              \n          <\/div>         \n                \n         <div class=\"uc_post_content\">Which structure offers more benefits, E-House or a traditional electrical room? 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What is IEC 61439 compliance, and...<\/div>        \n                 \n      <\/div>\n    <\/div>\n     \n       \n  \n   <\/div>\n\n<\/div>\n\n\n  <div id=\"uc_post_list_elementor_4981b2e_empty_message\" class=\"ue-no-posts-found\"  style=\"display:none\" >No posts found<\/div>\n\n\n<!-- end Post List -->\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<div class=\"elementor-element elementor-element-fc88d24 e-flex e-con-boxed e-con e-parent\" data-id=\"fc88d24\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;motion_fx_motion_fx_scrolling&quot;:&quot;yes&quot;,&quot;motion_fx_devices&quot;:[&quot;desktop&quot;,&quot;tablet&quot;,&quot;mobile&quot;]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-117ef26 elementor-widget elementor-widget-spacer\" data-id=\"117ef26\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3435295 elementor-widget elementor-widget-heading\" data-id=\"3435295\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">Specifying switchgear for a project where the form of internal separation matters? 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