Isolation 🇬🇧 UK
What is the safe isolation procedure?
Identify the circuit, switch off and lock off (keep the key), post a warning notice, prove your GS38 voltage indicator on a proving unit, test all combinations (L–N, L–E, N–E), then re-prove the indicator.
Prove → test → re-prove
Regulation: HSE GS38; Electricity at Work Regulations 1989; BS 7671 537.
Study aid in plain English, not the text of the standard. Always check the current BS 7671 and your local rules. Electrical work must be done by a licensed or registered electrician.
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