{"id":17291,"date":"2026-09-06T02:18:12","date_gmt":"2026-09-05T18:18:12","guid":{"rendered":"https:\/\/www.wehopower.com\/?post_type=news&#038;p=17291"},"modified":"2026-09-06T02:42:15","modified_gmt":"2026-09-05T18:42:15","slug":"multiple-smps-rcd-leakage-current-budget","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/","title":{"rendered":"Why Multiple Switching Power Supplies Trip an RCD: Build a Leakage-Current Budget"},"content":{"rendered":"<div class=\"weho-seo-geo-article\" data-weho-package=\"weho-cycle90-tg-001\">\n<header style=\"border-bottom:3px solid #28526d;padding-bottom:24px;margin-bottom:32px\">\n<div class=\"eyebrow\">Branch evidence workbook<\/div>\n<p class=\"dek\" style=\"margin:0 0 20px\">Count the equipment. Keep the observed branch separate.<\/p>\n<\/header>\n<div class=\"answer\" style=\"font-size:20px;line-height:1.7;background:#eef3f7;padding:24px;border-left:4px solid #28526d;margin:26px 0\">\n<p style=\"margin:0 0 20px\">Several switching power supplies may contribute to an RCD trip, but unit count does not establish the cause. Build a budget for the complete monitored branch and each relevant operating state. Keep the sum of comparable equipment-current magnitudes separate from the whole-branch observation. Use both records to support a qualified person&#39;s investigation of the actual installation, not to choose a universal trip threshold.<\/p>\n<figure data-role=\"hero\" style=\"margin:30px 0;\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho-multiple-smps-rcd-leakage-current-budget-hero-6a1808836e.webp?quality=85&strip=all\" alt=\"Why Multiple Switching Power Supplies Trip an RCD: Build a Leakage-Current Budget  title=\" width=\"1536\" height=\"1024\" loading=\"eager\" style=\"display:block;width:100%;max-width:100%;height:auto;object-fit:contain\" Why Multiple Switching Power Supplies Trip an RCD: Build Leakage-Current Budget title=\"\"><figcaption style=\"font-size:13px;line-height:1.6;color:#526774;margin-top:12px\">Concept illustration generated with AI; not a depiction of a specific WEHO model or customer installation.<\/figcaption><\/figure>\n<\/div>\n<div class=\"story\">\n<section id=\"branch\" class=\"\">\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\">Table of Contents<\/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;\">Toggle<\/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\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Name_the_branch_before_blaming_a_model\" >Name the branch before blaming a model<\/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\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Open_the_two-record_workbook\" >Open the two-record workbook<\/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\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Calculate_the_screen_preserve_the_observation\" >Calculate the screen; preserve the observation<\/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\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Why_can_several_power_supplies_be_associated_with_one_RCD_trip\" >Why can several power supplies be associated with one RCD trip?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Can_this_worksheet_tell_me_which_RCD_rating_to_choose\" >Can this worksheet tell me which RCD rating to choose?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Does_this_article_publish_a_leakage-current_value_for_the_WEHO_RSP-200\" >Does this article publish a leakage-current value for the WEHO RSP-200?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Is_the_arithmetic_total_enough_to_approve_the_installation\" >Is the arithmetic total enough to approve the installation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#What_if_the_trip_occurs_only_during_startup_or_another_transition\" >What if the trip occurs only during startup or another transition?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#What_should_I_send_WEHO_when_asking_about_the_RSP-200\" >What should I send WEHO when asking about the RSP-200?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Request_the_RSP-200_evidence_that_fills_a_row\" >Request the RSP-200 evidence that fills a row<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Send_a_question_packet_not_a_request_for_reassurance\" >Send a question packet, not a request for reassurance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Close_the_review_without_double_counting\" >Close the review without double counting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Sources_and_evidence_boundary\" >Sources and evidence boundary<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.wehopower.com\/fr\/news\/multiple-smps-rcd-leakage-current-budget\/#Reference_URLs\" >Reference URLs<\/a><\/li><\/ul><\/nav><\/div>\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"Name_the_branch_before_blaming_a_model\"><\/span>Name the branch before blaming a model<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin:0 0 20px\">Give the RCD and monitored branch a unique identifier, then list every AC-DC supply and connected device inside that boundary. Record state changes because the active equipment population can differ between observations.<\/p>\n<p style=\"margin:0 0 20px\">Schneider Electric&#39;s UPS example describes input leakage as the sum of UPS leakage and leakage from all connected load devices.  It is not a WEHO specification or a universal RCD rule; it supports only the conservative practice of accounting for all equipment behind the same RCD.<\/p>\n<p style=\"margin:0 0 20px\">XP Power likewise states that, when multiple power supplies are implemented in one application, the overall system earth-leakage current must be considered for safety-standards compliance.  Both sources support the accounting boundary; neither selects the RCD or supplies a WEHO leakage value.<\/p>\n<p style=\"margin:0 0 20px\">Use one row per physical unit. Units with the same model name can serve different loads or states, so preserve unit tags and conditions.<\/p>\n<\/section>\n<section id=\"evidence\" class=\"\">\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"Open_the_two-record_workbook\"><\/span>Open the two-record workbook<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<blockquote style=\"padding:20px 24px;border-left:4px solid #28526d;background:#eef3f7;margin:26px 0\">\n<p style=\"margin:0 0 20px\">Review boundary: the worksheet organizes evidence; it does not prescribe energized testing, probe placement, grounding changes or protective-device selection. Those decisions belong to qualified personnel using the exact installation and controlled requirements.<\/p>\n<\/blockquote>\n<p style=\"margin:0 0 20px\">Show which values are documented, observed, unknown, and assigned to an owner; do not fill gaps with guesses.<\/p>\n<p style=\"margin:0 0 20px\">Use four labels. A <strong>per-equipment entry<\/strong> is a nonnegative magnitude for one identified unit with its conditions. The <strong>equipment-budget upper bound<\/strong> is the scalar sum of comparable entries. A <strong>whole-branch residual-current observation<\/strong> is a separate record for one boundary and state. <strong>Fault or insulation-event evidence<\/strong> remains an incident record, never an ordinary budget input.<\/p>\n<div class=\"table-wrap\" style=\"overflow-x:auto;margin:26px 0\">\n<table style=\"width:100%;border-collapse:collapse;font-size:15px;line-height:1.6\">\n<thead>\n<tr>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Worksheet field<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">What to record<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Evidence status<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Decision owner<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Monitored boundary<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">RCD identifier and the equipment included behind it<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Drawing or verified equipment list<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">System engineer<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Unit identity<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Manufacturer, exact model, revision, and unit tag<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Controlled page, datasheet, or unit label<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Engineering and purchasing<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Operating state<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Normal state, standby state, and relevant transition under review<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Authorized test plan<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Test owner<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Source condition<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">The input and environmental conditions defined for the observation<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Measurement record<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Qualified test person<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Per-equipment entry<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Nonnegative magnitude with identity and stated conditions, from controlled evidence or an authorized per-unit method<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Documented or observed<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Technical reviewer<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Equipment-budget upper bound<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Conservative scalar sum for one clearly named state<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Derived from comparable per-equipment rows<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">System engineer<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Whole-branch observation<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">One separately preserved residual-current observation for the defined boundary and state<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Authorized observation record<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Qualified test person<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">RCD decision basis<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Project-specific acceptance criterion and applicable requirements<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Controlled project record<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Qualified RCD reviewer<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Disposition<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Accept, investigate, separate for analysis, or hold pending evidence<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Signed decision<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Design authority<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin:0 0 20px\">Keep different conditions in separate records. Mark unavailable values \u201cnot yet verified,\u201d name an owner, and request the missing evidence.<\/p>\n<p style=\"margin:0 0 20px\">For each observation, retain the authorized method, instrument, time, operating state and responsible person.<\/p>\n<\/section>\n<section id=\"calculation\" class=\"\">\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"Calculate_the_screen_preserve_the_observation\"><\/span>Calculate the screen; preserve the observation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin:0 0 20px\">For each state, choose the evidence path first. In a documentation-led screen, let each comparable per-equipment magnitude be <code>|I_device,i|<\/code>, with identity, conditions, and source attached. The conservative bound is:<\/p>\n<p style=\"margin:0 0 20px\"><code>I_budget,max = \u03a3 |I_device,i|<\/code> <\/p>\n<figure data-role=\"diagram\" style=\"margin:30px 0;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho-multiple-smps-rcd-leakage-current-budget-diagram-a6c1a3be9d.png?quality=85&strip=all\" alt=\"Why Multiple Switching Power Supplies Trip an RCD: Build a Leakage-Current Budget  title=\" width=\"1200\" height=\"675\" loading=\"lazy\" style=\"display:block;width:100%;max-width:100%;height:auto;object-fit:contain\" Why Multiple Switching Power Supplies Trip an RCD: Build Leakage-Current Budget title=\"\"><figcaption style=\"font-size:13px;line-height:1.6;color:#526774;margin-top:12px\">Source-bounded screening method only; the magnitude sum is not a predicted residual current, universal trip threshold, protective-device rating, or compliance result.<\/figcaption><\/figure>\n<p style=\"margin:0 0 20px\">The worksheet has two records with different meanings. The calculated bound shows the equipment counted; the branch observation records the actual boundary and state.<\/p>\n<p style=\"margin:0 0 20px\">Preserve a whole-branch observation as its own record for the exact boundary, state, method, and instrument. Never add it to the per-equipment bound or add device entries to it. A difference between the paths is an investigation prompt, not permission to alter RCD coordination or grounding.<\/p>\n<p style=\"margin:0 0 20px\">Use a compact worksheet:<\/p>\n<div class=\"table-wrap\" style=\"overflow-x:auto;margin:26px 0\">\n<table style=\"width:100%;border-collapse:collapse;font-size:15px;line-height:1.6\">\n<thead>\n<tr>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Unit tag<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Exact model<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">State<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Evidence type<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Recorded value<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Conditions<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Source or record ID<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Included in total?<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Open question<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Each unit<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Exact identity<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Defined state<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Published or observed<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Verified value only<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Source conditions<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Evidence reference<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Yes \/ No with reason<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Owner and due date<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">BUDGET-A<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Equipment set<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Defined state A<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Derived screen<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Scalar sum of included device-current magnitudes<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Comparable stated basis<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Worksheet revision<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Review required<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Acceptance owner<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">BRANCH-MEAS-A<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">RCD-monitored branch<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Defined state A<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Whole-branch observation<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Preserve separately<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Authorized method conditions<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Measurement record<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Never add to BUDGET-A<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Acceptance owner<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin:0 0 20px\">Repeat the table for each relevant state. Give a transition its own event record, and distinguish a missing value from an observed zero.<\/p>\n<\/section>\n<section id=\"questions\" class=\"\">\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 id=\"faq-1\" style=\"font-size:21px;line-height:1.4;margin:24px 0 14px;scroll-margin-top:80px\"><span class=\"ez-toc-section\" id=\"Why_can_several_power_supplies_be_associated_with_one_RCD_trip\"><\/span>Why can several power supplies be associated with one RCD trip?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:0 0 20px\">Do not infer cause from unit count. Account for the complete monitored branch, then review the actual installation evidence; the cited UPS example supplies only that conservative accounting principle.<\/p>\n<div class=\"subsections\">\n<div class=\"subsection\">\n<h3 id=\"faq-2\" style=\"font-size:21px;line-height:1.4;margin:24px 0 14px;scroll-margin-top:80px\"><span class=\"ez-toc-section\" id=\"Can_this_worksheet_tell_me_which_RCD_rating_to_choose\"><\/span>Can this worksheet tell me which RCD rating to choose?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:0 0 20px\">No. It provides no universal threshold, type, or rating. A qualified person must use the exact installation, requirements, and equipment documentation.<\/p>\n<\/div>\n<div class=\"subsection\">\n<h3 id=\"faq-3\" style=\"font-size:21px;line-height:1.4;margin:24px 0 14px;scroll-margin-top:80px\"><span class=\"ez-toc-section\" id=\"Does_this_article_publish_a_leakage-current_value_for_the_WEHO_RSP-200\"><\/span>Does this article publish a leakage-current value for the WEHO RSP-200?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:0 0 20px\">No. The validated context supports identity and URL only. Obtain controlled model-specific evidence and conditions before entering a value.<\/p>\n<\/div>\n<div class=\"subsection\">\n<h3 id=\"faq-4\" style=\"font-size:21px;line-height:1.4;margin:24px 0 14px;scroll-margin-top:80px\"><span class=\"ez-toc-section\" id=\"Is_the_arithmetic_total_enough_to_approve_the_installation\"><\/span>Is the arithmetic total enough to approve the installation?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:0 0 20px\">No. The scalar sum is a screening upper bound, not the RCD signal. Review evidence quality, states, boundary, any separate branch observation, project requirements, and uncertainty.<\/p>\n<\/div>\n<div class=\"subsection\">\n<h3 id=\"faq-5\" style=\"font-size:21px;line-height:1.4;margin:24px 0 14px;scroll-margin-top:80px\"><span class=\"ez-toc-section\" id=\"What_if_the_trip_occurs_only_during_startup_or_another_transition\"><\/span>What if the trip occurs only during startup or another transition?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:0 0 20px\">Create a separate event record with the equipment population, timing, authorized method, and result. Do not blend it into a steady-state row or declare an unsupported cause.<\/p>\n<\/div>\n<div class=\"subsection\">\n<h3 id=\"faq-6\" style=\"font-size:21px;line-height:1.4;margin:24px 0 14px;scroll-margin-top:80px\"><span class=\"ez-toc-section\" id=\"What_should_I_send_WEHO_when_asking_about_the_RSP-200\"><\/span>What should I send WEHO when asking about the RSP-200?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:0 0 20px\">Send the model identity, unit count, input context, states, installation description, and exact document or value needed. State that it will enter a branch-screening worksheet, not act as a standalone release decision.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"product\" class=\"\">\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"Request_the_RSP-200_evidence_that_fills_a_row\"><\/span>Request the RSP-200 evidence that fills a row<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin:0 0 20px\">The validated WEHO catalog identifies product 8680 as <strong>RSP-200 AC To DC Power Supply With PFC<\/strong> at the <a href=\"https:\/\/www.wehopower.com\/product\/rsp-200-ac-to-dc-power-supply-with-pfc\/\">current RSP-200 product page<\/a>.  This establishes identity and the inquiry link only.<\/p>\n<figure data-role=\"product\" style=\"margin:30px 0;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho-multiple-smps-rcd-leakage-current-budget-product-858eecc007.webp?quality=85&strip=all\" alt=\"Why Multiple Switching Power Supplies Trip an RCD: Build a Leakage-Current Budget  title=\" width=\"800\" height=\"800\" loading=\"lazy\" style=\"display:block;width:100%;max-width:100%;height:auto;object-fit:contain\" Why Multiple Switching Power Supplies Trip an RCD: Build Leakage-Current Budget title=\"\"><figcaption style=\"font-size:13px;line-height:1.6;color:#526774;margin-top:12px\">Real WEHO catalog asset; the visible label identifies the product only and supplies no installation-suitability evidence.<\/figcaption><\/figure>\n<p style=\"margin:0 0 20px\">It does <strong>not<\/strong> establish a leakage-current value, authorize multiple units behind one RCD, or select that RCD. Request the controlled model-specific evidence and its conditions, then keep the response revision and unit identity with the worksheet.<\/p>\n<p style=\"margin:0 0 20px\">For readers who need background before building the worksheet, WEHO also publishes <a href=\"https:\/\/www.wehopower.com\/news\/what-is-a-switching-power-supply-how-smps-works\/\">What Is a Switching Power Supply? How SMPS Works<\/a> and a separate discussion of <a href=\"https:\/\/www.wehopower.com\/news\/should-a-power-supply-be-grounded\/\">whether a power supply should be grounded<\/a>. These are context links; they do not replace installation-specific leakage evidence or qualified RCD review.<\/p>\n<\/section>\n<section id=\"inquiry\" class=\"\">\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"Send_a_question_packet_not_a_request_for_reassurance\"><\/span>Send a question packet, not a request for reassurance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin:0 0 20px\">Ask for reproducible evidence instead of whether a model is \u201csafe with an RCD.\u201d Include:<\/p>\n<ul>\n<li style=\"margin:8px 0\">the exact product model and revision under consideration;<\/li>\n<li style=\"margin:8px 0\">the number of units and the other equipment inside the RCD-monitored boundary;<\/li>\n<li style=\"margin:8px 0\">the input and operating states that must be assessed;<\/li>\n<li style=\"margin:8px 0\">the project environment and installation context;<\/li>\n<li style=\"margin:8px 0\">the requested model-specific document and the conditions that must accompany any value;<\/li>\n<li style=\"margin:8px 0\">the current worksheet, with unknown cells and decision owners visible; and<\/li>\n<li style=\"margin:8px 0\">the project reviewer who will decide whether the returned evidence is sufficient.<\/li>\n<\/ul>\n<p style=\"margin:0 0 20px\">When evidence arrives, preserve the new source revision, identify affected rows, recalculate relevant states, and repeat technical review.<\/p>\n<\/section>\n<section id=\"decision\" class=\"\">\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"Close_the_review_without_double_counting\"><\/span>Close the review without double counting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin:0 0 20px\">Use controlled project criteria; do not insert a generic threshold or rating.<\/p>\n<div class=\"table-wrap\" style=\"overflow-x:auto;margin:26px 0\">\n<table style=\"width:100%;border-collapse:collapse;font-size:15px;line-height:1.6\">\n<thead>\n<tr>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Evidence outcome<\/th>\n<th style=\"text-align:left;vertical-align:top;padding:14px;background:#28526d;color:#fff;border:1px solid #d9e2e5\">Safe next decision<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Equipment list, states, or evidence conditions are incomplete<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Hold the RCD decision and assign the missing evidence<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Recorded entries are not comparable<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Separate the records by condition and repeat the authorized review<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">One state differs materially from the others<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Investigate that state without declaring a cause from correlation alone<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">The screening bound and any whole-branch observation have been reviewed without double counting<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Route the evidence to the qualified RCD reviewer for acceptance, investigation, or redesign<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">The installation changes after review<\/td>\n<td style=\"text-align:left;vertical-align:top;padding:14px;border:1px solid #d9e2e5\">Reopen the worksheet and repeat the affected checks<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin:0 0 20px\">Keep the RCD, branch population, worksheet revision and evidence references in the qualified review record. Neither the screening bound nor one branch observation establishes product fit, trip cause, coordination, conformity or wiring safety. Never bypass the RCD, alter protective-earth (PE) connections or energize equipment outside an authorized procedure.<\/p>\n<\/section>\n<section id=\"sources\" class=\"\">\n<h2 style=\"font-size:clamp(23px,3vw,30px);line-height:1.3;color:#28526d;margin:34px 0 20px\"><span class=\"ez-toc-section\" id=\"Sources_and_evidence_boundary\"><\/span>Sources and evidence boundary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li style=\"margin:8px 0\">Schneider Electric, <span class=\"source-attribution\">RCD (Residual Current Device) on input side of the UPS<\/span> <a href=\"#source-reference-1\" aria-label=\"Source 1\">[1]<\/a> \u2014 source basis for the conservative accumulation screen. This is a UPS example; no threshold, RCD prescription, or WEHO conclusion is transferred. <\/li>\n<li style=\"margin:8px 0\">XP Power, <span class=\"source-attribution\">Your Essential Guide to Power Supplies<\/span> <a href=\"#source-reference-2\" aria-label=\"Source 2\">[2]<\/a> \u2014 source basis for considering aggregate system earth leakage when multiple supplies are used; no WEHO value or RCD decision is transferred. <\/li>\n<li style=\"margin:8px 0\">WEHO Power, <a href=\"https:\/\/www.wehopower.com\/product\/rsp-200-ac-to-dc-power-supply-with-pfc\/\">RSP-200 AC To DC Power Supply With PFC<\/a> \u2014 product identity and inquiry URL only. The page is not used here to assert a leakage-current value or RCD suitability.<\/li>\n<\/ul>\n<\/section>\n<\/div>\n<section class=\"source-url-record\" style=\"margin:32px 0;padding:20px;border:1px solid #d9e3e7\">\n<h2 style=\"font-size:23px;line-height:1.4\"><span class=\"ez-toc-section\" id=\"Reference_URLs\"><\/span>Reference URLs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"font-size:14px\">Exact source addresses for the attributed statements above:<\/p>\n<ol>\n<li id=\"source-reference-1\" style=\"margin:12px 0;font-size:13px;overflow-wrap:anywhere\"><span>https:\/\/www.se.com\/us\/en\/faqs\/FA157373\/<\/span><\/li>\n<li id=\"source-reference-2\" style=\"margin:12px 0;font-size:13px;overflow-wrap:anywhere\"><span>https:\/\/www.xppower.com\/storage\/portals\/0\/brochures\/Essential_Guide_to_Power_Supplies.pdf<\/span><\/li>\n<\/ol>\n<\/section>\n<footer style=\"border-top:1px solid #dae3e7;padding-top:22px;margin-top:36px;font-size:13px;color:#526774\">Prepared for WEHO with AI-assisted editorial and technical review. Product suitability and installation decisions require project-specific engineering approval.<\/footer>\n<p><script type=\"application\/ld+json\" class=\"weho-package-schema\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.wehopower.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"News\",\"item\":\"https:\/\/www.wehopower.com\/news\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Why Multiple Switching Power Supplies Trip an RCD: Build a Leakage-Current Budget\",\"item\":\"https:\/\/www.wehopower.com\/news\/multiple-smps-rcd-leakage-current-budget\/\"}]}]}<\/script>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Investigate switching power supply leakage current RCD tripping with a traceable branch budget, comparable evidence, event records, and qualified review.<\/p>","protected":false},"author":1,"featured_media":17286,"parent":0,"menu_order":49,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,148],"class_list":["post-17291","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-industry-news","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/comments?post=17291"}],"version-history":[{"count":1,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17291\/revisions"}],"predecessor-version":[{"id":17294,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17291\/revisions\/17294"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media\/17286"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media?parent=17291"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news_category?post=17291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}