A domestic electrical installer in any IEC 60364 jurisdiction — France (NF C 15-100), Germany (DIN VDE 0100), the United Kingdom (BS 7671), Italy (CEI 64-8), Australia / New Zealand (AS/NZS 3000), and most of the rest of the world outside the NEC — files this single-line as part of the *Certificat de Conformité* / *Elektroinstallationsattest* / *Electrical Installation Condition Report* required after a new installation or major alteration. EN 61439-3 is the European harmonized standard for *Distribution Boards intended to be operated by Ordinary persons* (DBO), and IEC 60364-4-41 governs the protection-against-shock chain (isolation → 30 mA RCD → branch protection). Unlike NEC residential practice where the *panel* lives as a leaf on the SLD with internals on a separate panel schedule, the IEC 60364 single-line is expected to expand the consumer unit's internal protection chain.