Safe Isolation Procedure

City & Guilds 2365

Electrical Installation

Check the condition of the voltage indicator and use a proving unit to check that the voltage indicator is functioning correctly.

Locate the isolation device and lock off with a safety lockout. Keep the key with you.

Use the voltage indicator to check that there is now voltage between:


Phase and Neutral

Phase and Earth

Neutral and Earth

Use a proving unit to recheck that the voltage indicator is functioning correctly.

Position sign to indicate that the circuit is being worked on and should not be energised.

Phase and Neutral

Phase and Earth

Neutral and Earth