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| | Key Requirement | |----------|----------------------| | Earthing & Bonding | Main earthing terminal, main protective bonding (gas, water, etc.), earth fault loop impedance within limits (Table 41.3 for ADS). | | Circuit Design | Current-carrying capacity (derating for grouping, ambient temperature, insulation) and voltage drop ≤ 3% (lighting) / 5% (other). | | RCD Protection | Mandatory for: socket outlets ≤32 A (except specific labelled circuits), mobile equipment, cables buried <50 mm in walls, locations with showers/baths, TT earthing systems. | | Special Locations | Bathrooms (zones 0,1,2), swimming pools, saunas, marinas, caravans, medical locations, EV charging (surge protection & PEN fault detection). | | Inspection & Testing | Pre-energisation checks (continuity, insulation resistance, polarity), live testing (Ze, Zs, RCD trip times, functional tests). Results recorded on an Electrical Installation Certificate (EIC) or Minor Works Certificate (MWC). | | Documentation | Single-line diagrams, schedules of circuits/equipment, risk assessments, and maximum demand calculations. |
Failure to provide the correct certification (Electrical Installation Certificate or Minor Works Certificate) means the work does not comply with BS 7671. Special Installations and Locations bs 7671 requirements for electrical installations
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