{"id":2839,"date":"2026-07-22T09:00:00","date_gmt":"2026-07-22T09:00:00","guid":{"rendered":"https:\/\/chac-electric.com\/?p=2839"},"modified":"2026-07-22T09:00:00","modified_gmt":"2026-07-22T09:00:00","slug":"type-1-vs-type-2-spd-selection-guide","status":"publish","type":"post","link":"https:\/\/chac-electric.com\/pt\/blog\/type-1-vs-type-2-spd-selection-guide\/","title":{"rendered":"How Should Distribution Panels Define Type 1 and Type 2 SPD Boundaries?"},"content":{"rendered":"<p style=\"margin:0 0 16px;line-height:1.7\"><strong>The right approach to type 1 vs type 2 surge protective device is to confirm the circuit role, project inputs, installation context, and model documentation before approving a device.<\/strong> This article gives B2B teams a structured way to prepare that review.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Type 1 vs Type 2 Surge Protective Devices: Selection Boundaries for Distribution Panels overview\" src=\"https:\/\/chac-electric.com\/wp-content\/uploads\/2026\/07\/CQM5L-5.webp\" \/><\/figure>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 style=\"margin:42px 0 14px\">Contents<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"#part-1-what-decision-does-this-guide-support\">Part 1. What decision does this guide support?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-2-which-project-inputs-should-be-confirmed-first\">Part 2. Which project inputs should be confirmed first?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-3-where-is-the-selection-boundary\">Part 3. Where is the selection boundary?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-4-how-should-the-control-and-assembly-context-be-reviewed\">Part 4. How should the control and assembly context be reviewed?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-5-what-should-the-rfq-contain\">Part 5. What should the RFQ contain?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-6-which-chac-route-should-buyers-use\">Part 6. Which CHAC route should buyers use?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-7-what-are-the-fit-boundaries\">Part 7. What are the fit boundaries?<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px\" id=\"part-1-what-decision-does-this-guide-support\">Part 1. What decision does this guide support?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Type 1 vs Type 2 Surge Protective Devices: Selection Boundaries for Distribution Panels is a pre-RFQ decision guide for panel builders, OEM teams, and distributors. It helps teams separate the equipment role, the installation context, and the information that must be confirmed before a model is selected.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Start with the published <a href=\"https:\/\/chac-electric.com\/pt\/terminal-electrical-appliances\/\">Terminal Electrical Appliances category<\/a> and treat model documentation as controlling. A product name, a generic feature list, or a similar-looking device is not sufficient evidence for a project decision.<\/p>\n<h2 style=\"margin:42px 0 14px\" id=\"part-2-which-project-inputs-should-be-confirmed-first\">Part 2. Which project inputs should be confirmed first?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Collect the circuit diagram, supply and load context, installation environment, required control functions, applicable project standard, and the desired documentation. Record the expected operating sequence as well as the physical assembly constraints.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Input<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Why it matters<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Do not assume<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Circuit role<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Defines the device function to review<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">A related device has the same duty<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Installation context<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Affects assembly and environmental review<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Bench conditions match the installed panel<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Control interface<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Defines command and feedback needs<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Every coil, signal, or accessory is interchangeable<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Project documentation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Supports the final selection<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">A category page is a model datasheet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Type 1 vs Type 2 Surge Protective Devices: Selection Boundaries for Distribution Panels selection review\" src=\"https:\/\/chac-electric.com\/wp-content\/uploads\/2026\/07\/813e8b7750404035b0e89421ac3741c2.webp\" \/><\/figure>\n<h2 style=\"margin:42px 0 14px\" id=\"part-3-where-is-the-selection-boundary\">Part 3. Where is the selection boundary?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">This topic is useful for scoping an RFQ, but it is not a substitute for protection coordination, installation instructions, or a model-specific data sheet. Engineers should confirm the final circuit values, wiring arrangement, required standards, and any safety function from the selected product documentation.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">A comparison can clarify the questions to ask; it cannot establish that a particular model is suitable for every installation.<\/p>\n<h2 style=\"margin:42px 0 14px\" id=\"part-4-how-should-the-control-and-assembly-context-be-reviewed\">Part 4. How should the control and assembly context be reviewed?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Review the single-line diagram and control diagram together. Identify what starts, stops, signals, isolates, protects, or monitors the circuit, then assign each function to the device that is documented for that role.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Ask the panel team to document terminals, auxiliary feedback, enclosure layout, service access, labeling, and commissioning checks. This avoids turning a generic component request into an unreviewable specification.<\/p>\n<h2 style=\"margin:42px 0 14px\" id=\"part-5-what-should-the-rfq-contain\">Part 5. What should the RFQ contain?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">A usable RFQ names the application, circuit role, installation conditions, required interfaces, target market, requested documentation, branding needs, and the drawing or bill-of-material reference. Where ratings or certifications are required, ask for the exact model evidence rather than inferring it from a category.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">For an OEM route, include packaging and labeling requirements with the engineering inputs at <a href=\"https:\/\/chac-electric.com\/pt\/terminal-electrical-products-customization\/\">CHAC Electric&#8217;s customization page<\/a>.<\/p>\n<h2 style=\"margin:42px 0 14px\" id=\"part-6-which-chac-route-should-buyers-use\">Part 6. Which CHAC route should buyers use?<\/h2>\n<h3 style=\"margin:28px 0 12px\">Product recommendation<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Use the published <a href=\"https:\/\/chac-electric.com\/pt\/product\/cqm5-series-molded-case-circuit-breakers-2\/\">Cqm5 Series Molded Case Circuit Breakers 2<\/a> as a product-route starting point after the RFQ inputs are confirmed. It is a route to review with CHAC Electric, not a claim that the product fits every system.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">The <a href=\"https:\/\/chac-electric.com\/pt\/terminal-electrical-appliances\/\">Terminal Electrical Appliances category<\/a> provides the broader product-family context. Buyers who need branding or packaging discussion can send their confirmed inputs through <a href=\"https:\/\/chac-electric.com\/pt\/terminal-electrical-products-customization\/\">CHAC Electric&#8217;s OEM\/ODM route<\/a>.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Why not recommend a generic substitute: the final selection depends on the project diagram and the exact model documentation.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Type 1 vs Type 2 Surge Protective Devices: Selection Boundaries for Distribution Panels product-route review\" src=\"https:\/\/chac-electric.com\/wp-content\/uploads\/2026\/07\/6c934ba54be0453e82c7bf6d831265e6.webp\" \/><\/figure>\n<h2 style=\"margin:42px 0 14px\" id=\"part-7-what-are-the-fit-boundaries\">Part 7. What are the fit boundaries?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Fit Boundary: this guide supports early specification and supplier communication for type 1 vs type 2 surge protective device. It is not suitable for live work instructions, final protection coordination, a safety assessment, or selection without verified project and model data.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">For a project review or product-route discussion, <a href=\"https:\/\/chac-electric.com\/pt\/contact-us\/\">contact CHAC Electric<\/a> with the drawings and required documentation.<\/p>\n<h2 style=\"margin:42px 0 14px\">FAQs<\/h2>\n<h3 style=\"margin:28px 0 12px\">What is the first step in a type 1 vs type 2 surge protective device review?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Start by defining the circuit role and collecting the drawing, operating sequence, and installation conditions.<\/p>\n<h3 style=\"margin:28px 0 12px\">Can a category page replace a model datasheet?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. A category page is a navigation aid; the selected model documentation governs the final review.<\/p>\n<h3 style=\"margin:28px 0 12px\">Which drawings should a panel builder provide?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Provide the single-line diagram, control diagram, assembly constraints, and the documentation requirements.<\/p>\n<h3 style=\"margin:28px 0 12px\">Why should buyers separate protection and control functions?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Each device must be reviewed for its documented role instead of being treated as an interchangeable substitute.<\/p>\n<h3 style=\"margin:28px 0 12px\">What belongs in an OEM electrical product RFQ?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Include the application, interfaces, conditions, drawings, requested documentation, branding, and packaging requirements.<\/p>\n<h3 style=\"margin:28px 0 12px\">When should an engineer review the final selected model?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Review it after the RFQ data is complete and before the design team approves the final specification.<\/p>\n<h2 style=\"margin:42px 0 14px\">References<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC Webstore<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">International Electrotechnical Commission<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>The right approach to type 1 vs type 2 surge protective device is to confirm the circuit role, project inputs, installation context, and model documentation before approving a device. This article gives B2B teams a structured way to prepare that review. Contents Part 1. What decision does this guide support? Part 2. Which project inputs [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":2821,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts\/2839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/comments?post=2839"}],"version-history":[{"count":1,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts\/2839\/revisions"}],"predecessor-version":[{"id":2992,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts\/2839\/revisions\/2992"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/media\/2821"}],"wp:attachment":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/media?parent=2839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/categories?post=2839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/tags?post=2839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}