Safe Isolation Procedure

Safe Isolation Procedure

Purpose

To ensure electrical circuits are safely isolated and proven dead before any work is carried out.

Required Equipment

• Approved Voltage Indicator
• Proving Unit
• Lock Off Device
• Warning Tag

Procedure

1. Identify The Correct Circuit

Confirm the circuit or equipment to be worked on and identify the correct means of isolation.

2. Inform Relevant Persons

Advise the customer, occupier or any affected persons that the supply will be isolated.

3. Isolate The Supply

Switch off the appropriate protective device or isolator.

4. Secure The Isolation

Apply a suitable lock off device and warning tag to prevent inadvertent re-energisation.

5. Prove The Tester

Verify the voltage indicator is functioning correctly using a proving unit.

6. Test For Dead

Test between:

• Line and Neutral
• Line and Earth
• Neutral and Earth

Confirm no voltage is present.

7. Re-Prove The Tester

Immediately re-test the voltage indicator on the proving unit to confirm it remains operational.

8. Commence Work

Only once the circuit has been safely isolated, locked off and proven dead may work begin.

Important Notes

• Never rely solely on switching off.
• Never assume a circuit is dead.
• Always use an approved voltage indicator.
• Always prove, test and re-prove.
• Maintain control of the key for any lock off device used.

JME Standard

No electrical work shall commence until the circuit has been isolated, secured, proven dead and verified in accordance with this procedure.