- Follow the safe isolation procedure: isolate, lock off, prove dead
- Use an approved voltage indicator to confirm the circuit is dead
- Test the voltage indicator with a proving unit before and after use
- Apply lock-off devices and personal danger tags at every isolation point
- Identify all sources of supply — some circuits have multiple feeds
- Ensure only competent and authorised persons carry out isolation
- Obtain a permit to work where required by your site procedures
- Verify isolation at the point of work, not just at the distribution board
- Keep keys for lock-off devices under the personal control of the isolator
- Re-check isolation after any break or shift change before resuming work
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- DON'T work on any electrical circuit without confirming it is isolated
- DON'T rely on switching off alone — always lock off and prove dead
- DON'T use a multimeter as a substitute for an approved voltage indicator
- DON'T remove another person's lock or danger tag without authorisation
- DON'T assume a circuit is dead because equipment has stopped working
- DON'T bypass or defeat interlocks on switchgear or control panels
- DON'T allow unauthorised persons to re-energise isolated circuits
- DON'T forget to check for stored energy in capacitors or batteries
- DON'T skip the proving unit test — faulty indicators give false readings
- DON'T rush the isolation process even under time pressure
See also: Electrical Safety Awareness | RCD Protection and 110 Volt Use
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