{"id":20537,"date":"2026-11-01T10:42:18","date_gmt":"2026-11-01T02:42:18","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/rsp320-it-distribution-voltage-earth\/"},"modified":"2026-11-01T10:42:18","modified_gmt":"2026-11-01T02:42:18","slug":"rsp320-it-distribution-voltage-earth","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/","title":{"rendered":"Using a Power Supply on an IT Distribution System: Check the Voltage-to-Earth Evidence"},"content":{"rendered":"<div class=\"weho-blog-content\">\n<p><strong>For an IT distribution system, verify both the voltage across the supply input and the voltage each input conductor can reach relative to earth, including the defined fault conditions.<\/strong> A wide AC input range alone cannot establish compatibility.<\/p>\n<p>An OEM panel engineer should obtain the installation\u2019s earthing-system description and the supply manufacturer\u2019s permitted conditions before approving the pairing. The <a href=\"https:\/\/www.wehopower.com\/de\/product\/rsp-320-ac-to-dc-power-supply-with-pfc\/\">WEHO RSP-320-12 family<\/a> is used to show the document questions. The public information reviewed here does not establish RSP-320-12 approval for IT distribution.<\/p>\n<nav class=\"toc\" aria-label=\"Article contents\">\n<p>In this article<\/p>\n<ol>\n<li><a href=\"#system\">Define the IT system at the equipment connection<\/a><\/li>\n<li><a href=\"#two-voltages\">Separate operating input range from voltage-to-earth suitability<\/a><\/li>\n<li><a href=\"#matrix\">Build a normal-and-fault envelope with the installation designer<\/a><\/li>\n<li><a href=\"#example\">A correct voltage across the input can leave a separate gap<\/a><\/li>\n<li><a href=\"#verification\">Agree the assessment scope before testing<\/a><\/li>\n<li><a href=\"#handoff\">Record the scope of the actual decision<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"system\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Inhaltsverzeichnis<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Umschalten<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/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=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Define_the_IT_system_at_the_equipment_connection\" >Define the IT system at the equipment connection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Separate_operating_input_range_from_voltage-to-earth_suitability\" >Separate operating input range from voltage-to-earth suitability<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Build_a_normal-and-fault_envelope_with_the_installation_designer\" >Build a normal-and-fault envelope with the installation designer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#A_correct_voltage_across_the_input_can_leave_a_separate_gap\" >A correct voltage across the input can leave a separate gap<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Agree_the_assessment_scope_before_testing\" >Agree the assessment scope before testing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Record_the_scope_of_the_actual_decision\" >Record the scope of the actual decision<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Use_the_project_record\" >Use the project record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Request_an_assessment_against_your_actual_network\" >Request an assessment against your actual network<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/de\/news\/rsp320-it-distribution-voltage-earth\/#Sources_and_further_reading\" >Sources and further reading<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Define_the_IT_system_at_the_equipment_connection\"><\/span>Define the IT system at the equipment connection<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>IT describes an earthing arrangement, not an information-technology load. <a href=\"https:\/\/productinfo.se.com\/easyups3s_pro_iec\/5cc9c4a1d6593c0001bb356a\/English\/990-91278%20Easy%20UPS%203S%20and%203M%20Earthing%20Principles_0000270863.xml\/%24\/ITSystemsREF_0000005374\" target=\"_blank\" rel=\"noopener\">Schneider Electric\u2019s IT-system guidance<\/a> describes an installation insulated from earth or connected through sufficiently high impedance, with exposed conductive parts earthed. It also describes insulation monitoring where an IT system is used for continuity of supply. That explanation provides system context; it does not approve any WEHO supply.<\/p>\n<p>Obtain the actual source drawing from the installation designer. Record whether a neutral is distributed, which two conductors feed the equipment, and how protective earthing and fault monitoring are arranged. \u201c230 V IT\u201d is not enough information to settle the input insulation question.<\/p>\n<p>Keep the installation\u2019s protective strategy under the responsible designer\u2019s control. Changing a power supply must not silently change the earth connection or defeat a monitoring arrangement.<\/p>\n<\/section>\n<section id=\"two-voltages\">\n<h2><span class=\"ez-toc-section\" id=\"Separate_operating_input_range_from_voltage-to-earth_suitability\"><\/span>Separate operating input range from voltage-to-earth suitability<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The RSP-320-12 page lists an AC input range of 90\u2013264 V. That describes a stated operating input window. The same page includes input-to-frame dielectric-test information, but a test voltage is not an automatic declaration of allowable continuous working voltage to earth, network type or fault-state operation.<\/p>\n<p>Request the manufacturer\u2019s permitted earthing systems and maximum input-conductor-to-earth conditions for the exact supplied construction. Include the intended first-fault conditions and their duration in the request. Do not convert a one-minute insulation test into an unlimited service rating.<\/p>\n<figure class=\"figure\" id=\"figure-diagram\"><picture><source media=\"(max-width: 600px)\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/decision-map-mobile-6.svg\" width=\"480\" height=\"1070\" type=\"image\/svg+xml\"><img loading=\"lazy\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/decision-map-6.svg\" alt=\"Using a Power Supply on an IT Distribution System: Check the Voltage-to-Earth Evidence  title=\" width=\"1200\" height=\"740\" decoding=\"async\" using power supply on an it distribution system: check the voltage-to-earth evidence title =\"\"><\/picture><figcaption>Check operating voltage and voltage-to-earth separately. Decision sequence. No wiring diagram, dimensions, test results or product approval. <a class=\"original-link\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/decision-map-6.svg\">View original image<\/a><\/figcaption><\/figure>\n<\/section>\n<section id=\"matrix\">\n<h2><span class=\"ez-toc-section\" id=\"Build_a_normal-and-fault_envelope_with_the_installation_designer\"><\/span>Build a normal-and-fault envelope with the installation designer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Condition<\/th>\n<th scope=\"col\">System information required<\/th>\n<th scope=\"col\">Supply evidence required<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Normal operation<\/th>\n<td>Voltage between connected conductors and each conductor to earth; expected variation.<\/td>\n<td>Permitted working conditions for exact model\/revision.<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Specified first earth fault<\/th>\n<td>Which conductor faults, resulting voltage-to-earth envelope and permitted duration.<\/td>\n<td>Suitability for that network and stress envelope.<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Monitoring operation<\/th>\n<td>Monitoring method, connected network and relevant installed capacitance\/leakage limits.<\/td>\n<td>Relevant input\/filter characteristics and manufacturer restrictions.<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Protection and disconnection<\/th>\n<td>Project rules and the responsible designer\u2019s fault-response requirements.<\/td>\n<td>Installation instructions and any required external protection.<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Source change or bypass<\/th>\n<td>Every source that can feed the input and its earthing arrangement.<\/td>\n<td>Coverage of each allowed source configuration.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Attach the source document to each numerical entry. Where the installation design has not established a value or state, ask for it; do not let an unfilled cell become an assumed pass.<\/p>\n<\/section>\n<section id=\"example\">\n<h2><span class=\"ez-toc-section\" id=\"A_correct_voltage_across_the_input_can_leave_a_separate_gap\"><\/span>A correct voltage across the input can leave a separate gap<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Illustrative review case:<\/strong> a panel proposal shows the expected AC voltage between its two supply conductors inside the published RSP-320-12 operating range. The equipment drawing labels one conductor N because that is the terminal name on the supply. The site drawing, however, does not establish that the conductor is an earth-referenced neutral under every allowed condition.<\/p>\n<p>The terminal name does not resolve the system topology. Return the proposal for the normal and specified fault-state voltage-to-earth values, then request exact-model confirmation against that envelope. The result may be further documentation, a different approved supply or a system-design change; the input-range comparison alone cannot choose the answer.<\/p>\n<p>Do not use a favorable no-load demonstration as a substitute for this evidence. A supply can appear to operate while questions about insulation stress, monitoring interaction or required protection remain unanswered.<\/p>\n<\/section>\n<section id=\"verification\">\n<h2><span class=\"ez-toc-section\" id=\"Agree_the_assessment_scope_before_testing\"><\/span>Agree the assessment scope before testing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Have the equipment designer, supply manufacturer and installation designer agree which claims are supported by documents and which need evaluation. A test plan should identify the permitted states, representative sample, monitoring observations and acceptance basis. The test method and fault simulation belong to qualified personnel using the applicable procedures.<\/p>\n<p>Avoid changing internal filter parts, removing protective earth or adding a new bonding link to make a sample appear compatible. Those changes create a different construction and can undermine the installation\u2019s protective design. If a manufacturer specifies a configuration option, retain the exact instructions and its scope.<\/p>\n<p>Include all allowed operating sources in the review. A panel that can also be fed through a UPS or generator needs the relevant source and earthing information for those states. One accepted source configuration does not approve another.<\/p>\n<\/section>\n<section id=\"handoff\">\n<h2><span class=\"ez-toc-section\" id=\"Record_the_scope_of_the_actual_decision\"><\/span>Record the scope of the actual decision<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use the <a href=\"\/de\/acceptance-record.html\/\">blank IT-system supply evidence matrix<\/a> to identify the connection, applicable documents and unresolved requests. Record whether the exact pairing is supported, requires further evidence or must be changed. State the approved operating states and revisions rather than writing only \u201cIT compatible.\u201d<\/p>\n<p>For RSP-320-12, keep the public-page reference separate from a project approval. It identifies the family to discuss with WEHO; it does not establish a network qualification absent from the model\u2019s confirmed installation documentation.<\/p>\n<\/section>\n<section id=\"project-record\">\n<h2><span class=\"ez-toc-section\" id=\"Use_the_project_record\"><\/span>Use the project record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"\/de\/acceptance-record.html\/\">Open the blank IT distribution system and power-supply evidence matrix<\/a> to record your conditions, evidence and decisions. The worksheet contains no pre-approved result.<\/p>\n<\/section>\n<section class=\"cta\" id=\"project-review\">\n<h2><span class=\"ez-toc-section\" id=\"Request_an_assessment_against_your_actual_network\"><\/span>Request an assessment against your actual network<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Send WEHO the RSP-320-12 variant, site earthing-system drawing, connected input conductors, normal and fault-state voltage-to-earth envelope, monitoring arrangement and intended operating sources. Request exact-model installation suitability and any limits for that configuration.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/de\/contact\/\">Discuss the supply and distribution-system evidence<\/a><\/p>\n<\/section>\n<section class=\"sources\" id=\"sources\">\n<h2><span class=\"ez-toc-section\" id=\"Sources_and_further_reading\"><\/span>Sources and further reading<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><a href=\"https:\/\/www.wehopower.com\/de\/product\/rsp-320-ac-to-dc-power-supply-with-pfc\/\">WEHO RSP-320 product information<\/a><\/li>\n<li><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2025\/07\/RSP-320W.pdf\">WEHO RSP-320W specification sheet<\/a><\/li>\n<li><a href=\"https:\/\/productinfo.se.com\/easyups3s_pro_iec\/5cc9c4a1d6593c0001bb356a\/English\/990-91278%20Easy%20UPS%203S%20and%203M%20Earthing%20Principles_0000270863.xml\/%24\/ITSystemsREF_0000005374\" target=\"_blank\" rel=\"noopener\">Schneider Electric \u2014 IT Systems, Earthing Principles 990-91278C-001<\/a><\/li>\n<\/ol>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>An acceptable input voltage between conductors does not establish suitability for the conductors\u2019 possible voltage to earth.<\/p>","protected":false},"author":2,"featured_media":20519,"parent":0,"menu_order":67,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[284],"class_list":["post-20537","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/news\/20537","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/comments?post=20537"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/news\/20537\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/media\/20519"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/media?parent=20537"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/de\/wp-json\/wp\/v2\/news_category?post=20537"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}