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Five mistakes that end a safe isolation assessmentWhich mistakes end it outright?
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These are not marks lost — treat them as the assessment stopping. The exact criteria can vary, so check the ones you will be assessed against.
| What you did | Why it ends it |
|---|---|
| Proved the AVI before, but not after | You have not proved anything. The commonest serious error there is |
| Used a voltage pen as proof of dead | A single-pole detector tells you voltage is present. It cannot tell you a conductor is dead |
| Left the key in the lock | It is not isolated if anyone can undo it. The key is on you |
| Tested before locking off | The order is lock, sign, prove, test, re-prove |
| Missed a second supply | Check for other sources and stored energy before you start |
EAWR · Regulation 4 EAWR · Regulation 12 EAWR · Regulation 13 EAWR · Regulation 14
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