{"id":27974,"date":"2026-11-09T17:34:12","date_gmt":"2026-11-09T17:34:12","guid":{"rendered":"https:\/\/tradefoxapp.com\/?page_id=27974"},"modified":"2026-11-09T23:01:48","modified_gmt":"2026-11-09T23:01:48","slug":"bs-7671","status":"publish","type":"page","link":"https:\/\/tradefoxapp.com\/fr\/bs-7671\/","title":{"rendered":"BS 7671 Guide"},"content":{"rendered":"\n<style>\n.tfg-page{--fg:#1d1d1f;--fg2:#6e6e73;--line:#d2d2d7;--soft:#f5f5f7;--brand:#F15927;--brand-ink:#C2410C;font-family:-apple-system,BlinkMacSystemFont,\"SF Pro Text\",\"SF Pro Display\",\"Helvetica Neue\",Helvetica,Arial,sans-serif!important;color:var(--fg);-webkit-font-smoothing:antialiased;font-size:19px;line-height:1.58;letter-spacing:-.012em;text-align:left;background:#fff}\n.tfg-page *,.tfg-page *::before,.tfg-page *::after{box-sizing:border-box}\n.tfg-page h1,.tfg-page h2,.tfg-page h3,.tfg-page p,.tfg-page li,.tfg-page td,.tfg-page th,.tfg-page a{font-family:inherit!important}\n.tfg-page 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.tfg-card:hover{text-decoration:none;transform:scale(1.015)}\n.tfg-card .n{font-size:13px;font-weight:600;color:var(--brand-ink)}\n.tfg-card .t{font-size:22px;font-weight:600;line-height:1.2}\n.tfg-card .d{font-size:15px;color:var(--fg2);margin-top:auto}\n@media (max-width:734px){.tfg-page{font-size:17px}.tfg-page .tfg h1{font-size:34px}.tfg-page .tfg-lede{font-size:20px}.tfg-page .tfg h2{font-size:26px;margin-top:44px}.tfg-page .tfg-hub h1{font-size:38px}\n.tfg-local-in{flex-direction:column;align-items:flex-start;gap:4px;padding:8px 16px}.tfg-page .tfg-local-title{font-size:17px}.tfg-local-links{width:100%;gap:16px}\n.tfg-pager{grid-template-columns:1fr 1fr}.tfg-pager .tfg-all{grid-column:1\/-1;grid-row:1;text-align:center}.tfg-page .tfg-brief{padding:22px 22px 8px}}\n\n<\/style>\n<div class=\"tfg-page\"><nav class=\"tfg-local\" aria-label=\"BS 7671 guide\"><div class=\"tfg-local-in\"><a class=\"tfg-local-title\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/\">BS 7671 Guide<\/a><div class=\"tfg-local-links\"><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/amendment-4\/\">What&#x27;s new in Amendment 4<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/before-you-start\/\">Before you start<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/protection-against-electric-shock\/\">Electric shock<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/fire-arc-fault-and-surge\/\">Fire, arc and surge<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/cable-selection-and-sizing\/\">Cable sizing<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/earthing-and-bonding\/\">Earthing and bonding<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/special-locations\/\">Special locations<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/ev-solar-batteries-and-heat-pumps\/\">EV, solar and batteries<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/inspection-and-testing\/\">Inspection and testing<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/certificates-and-eicr-codes\/\">Certificates and codes<\/a><a href=\"https:\/\/tradefoxapp.com\/bs-7671\/quick-reference\/\">Quick reference<\/a><\/div><\/div><\/nav><div class=\"tfg-hub\"><p class=\"tfg-eyebrow\">Tradefox<\/p><h1>BS 7671 Guide<\/h1><p class=\"tfg-lede\">The 18th Edition Wiring Regulations, Amendment 4, explained in plain English for working electricians. Practical, up to date and written by Tradefox.<\/p><div class=\"tfg-cards\"><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/amendment-4\/\"><span class=\"n\">Section 1<\/span><span class=\"t\">What&#x27;s new in BS 7671 Amendment 4 (2026)<\/span><span class=\"d\">BS 7671:2018+A4:2026 explained for UK electricians: key dates, what to cite on certificates, and the changes that affect everyday work on site.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/before-you-start\/\"><span class=\"n\">Section 2<\/span><span class=\"t\">Before you start: supply, earthing and demand<\/span><span class=\"d\">What to find out before you design or alter an installation: supply characteristics, Ze and PFC, earthing systems, PME limits, diversity and Part P.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/protection-against-electric-shock\/\"><span class=\"n\">Section 3<\/span><span class=\"t\">Protection Against Electric Shock: BS 7671 A4:2026 Guide<\/span><span class=\"d\">Basic and fault protection, ADS disconnection times, max Zs and the 80% check, 30 mA RCD rules, RCD types and blinding under BS 7671:2018+A4:2026.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/fire-arc-fault-and-surge\/\"><span class=\"n\">Section 4<\/span><span class=\"t\">Fire, arc fault and surge protection under BS 7671 A4:2026<\/span><span class=\"d\">AFDDs, cable supports in fire, escape routes, firefighter&#x27;s switches and SPDs under BS 7671:2018+A4:2026, explained for UK electricians working on site.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/cable-selection-and-sizing\/\"><span class=\"n\">Section 5<\/span><span class=\"t\">Choosing and sizing cables under BS 7671 A4:2026<\/span><span class=\"d\">Cable sizing under BS 7671:2018+A4:2026: Ib, In and Iz, correction factors, voltage drop, adiabatic CPC checks, concealed cables, terminations and buried runs.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/earthing-and-bonding\/\"><span class=\"n\">Section 6<\/span><span class=\"t\">Earthing and bonding under BS 7671:2018+A4:2026<\/span><span class=\"d\">Earthing vs bonding, main and supplementary bonding sizes, PME, TT electrodes, CPC sizing and the new A4 Section 545, explained for UK electricians.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/special-locations\/\"><span class=\"n\">Section 7<\/span><span class=\"t\">Special Locations in BS 7671 Part 7: Bathrooms, Pools, Sites and More<\/span><span class=\"d\">Part 7 of BS 7671:2018+A4:2026 for working electricians: bathrooms, hot tubs, construction sites, outdoor lighting, PoE and other special locations.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/ev-solar-batteries-and-heat-pumps\/\"><span class=\"n\">Section 8<\/span><span class=\"t\">EV charging, solar PV, batteries and heat pumps under BS 7671 A4<\/span><span class=\"d\">EV charge points, solar PV, home batteries and heat pumps under BS 7671:2018+A4:2026: PME options, RCD types, Chapter 57, multiple sources and DNO notification.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/inspection-and-testing\/\"><span class=\"n\">Section 9<\/span><span class=\"t\">Inspection and testing to BS 7671 A4:2026<\/span><span class=\"d\">A practical guide to Part 6 of BS 7671:2018+A4:2026: safe isolation, dead and live tests, RCD checks, correcting Zs and recording results.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/certificates-and-eicr-codes\/\"><span class=\"n\">Section 10<\/span><span class=\"t\">Certificates, reports and EICR codes<\/span><span class=\"d\">EIC, minor works and EICR paperwork under BS 7671:2018+A4:2026: which form to use, C1\/C2\/C3\/FI coding with examples, and landlord inspection deadlines.<\/span><\/a><a class=\"tfg-card\" href=\"https:\/\/tradefoxapp.com\/bs-7671\/quick-reference\/\"><span class=\"n\">Section 11<\/span><span class=\"t\">BS 7671 quick reference: key values and site checklists<\/span><span class=\"d\">BS 7671:2018+A4:2026 cheat sheet for electricians: key dates, disconnection times, RCD and AFDD rules, test values, bonding sizes and EICR codes.<\/span><\/a><\/div><\/div><div class=\"tfg-legal\"><p><strong>Important.<\/strong> This guide is written by Tradefox to help qualified electricians understand BS 7671:2018+A4:2026. It is a plain-English summary for learning and reference only. It is not the standard, it does not reproduce it, and it is not professional advice. Always work to the current edition of BS 7671, the IET guidance notes, manufacturers\u2019 instructions, Building Regulations and your scheme provider\u2019s requirements. Electrical work must be carried out by a competent person.<\/p><p>To the extent permitted by law, Tradefox accepts no liability for loss or damage arising from use of this guide. BS 7671 is published by the IET and BSI; Tradefox is not affiliated with or endorsed by either. See our <a href=\"https:\/\/tradefoxapp.com\/terms-of-use\/\">Terms of Use<\/a>. Spotted something out of date? Email <a href=\"mailto:info@tradefoxapp.com\">info@tradefoxapp.com<\/a>.<\/p><\/div><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"CollectionPage\", \"name\": \"Tradefox BS 7671 Guide\", \"url\": \"https:\/\/tradefoxapp.com\/bs-7671\/\", \"description\": \"A plain-English guide to BS 7671:2018+A4:2026 for UK electricians: A4 changes, RCDs, cable sizing, earthing, special locations, testing and EICR codes.\", \"publisher\": {\"@type\": \"Organization\", \"name\": \"Tradefox\", \"url\": \"https:\/\/tradefoxapp.com\/\"}, \"inLanguage\": \"en-GB\", \"mainEntity\": {\"@type\": \"ItemList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"What's new in BS 7671 Amendment 4 (2026)\", \"url\": \"https:\/\/tradefoxapp.com\/bs-7671\/amendment-4\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Before you start: supply, earthing and demand\", \"url\": \"https:\/\/tradefoxapp.com\/bs-7671\/before-you-start\/\"}, 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