Technical Bulletin 118a (continued)

Appendix 3

Below is a useful checklist to help you ensure that all steps have been completed:

Step Action required Pass

1 Check with responsible person that it is acceptable to isolate the circuit/equipment

2 Select an approved no-contact voltage detector. Check for damage and verify voltage detector on a known live source

3 Carry out sweep check on appliance/gas meter and any associated pipework as per no-contact voltage detector manufacturer’s instructions. If no voltage is indicated, re-check the no-contact voltage detector on known live source

4 Identify the point of electrical isolation for gas appliance that is to be worked on

5 Select an approved two-pole voltage indicator. Check for damage and verify on known live source or proving unit

6 Verify that the gas appliance is functional

7 Identify suitable means of isolation for the gas appliance

8 Isolate the gas appliance

9 Fit appropriate lock-off device and locks to isolation point. Fit warning label for isolation and identified work

10 Verify the gas appliance is isolated using two-pole voltage indictor

11 Re-check the two-pole voltage indicator is functional as per Step 5

12 Gas appliance should now be safe to work on

After completing the work, inspect and test to ensure that no damage has occurred. Remove the locking-off devices, locks and labels, and restore the electrical supply. Once the supply has be re-energised, test the gas appliance for correct and safe operation (eg 26/9 checks as per GSIUR). Complete and issue any appropriate documentation.