Key points you need to consider and write into your assignment IHMO are:-1/ Identify the circuit you need to isolate and where its isolation point is located.
2/ Verify with occupier / user / customer that it is convent to isolate, advise them what you are going to do.
3/ Advise the customer that it may be required to turn off all of the electric and they may want to put the kettle on now before you start work. Hint hint cup of tea with one sugar please
4/ Check the circuit is live by putting your "approved voltage tester" on the appropriate terminals.
5/ Turn off and isolate circuit.
6/ Lock off relevant switches / isolators to prevent accidental energising!.
7/ Verify that the circuit is now dead. i.e. No voltages on ANY conductor. (Test across all combinations L-N, L-E, N-E).
8/ Verify that your approved voltage detection instrument is still working with; preferably a proving unit, or a known live source. (such as incoming supply on domestic single phase is also consider acceptable).
9/ Do the work.
10/ Keep circuit fully locked off until ALL contractors have completed their work around the circuit, (e.g. has the plumber finished as well!)
11/ Preferably a multi padlock hasp should be used to allow each contractor to have his/her own padlock with unique key.
12/ When all contractors have finished, (and all electrical dead tests are ok), re-energise circuit and complete live tests relevant to changes carried out.
13/ Have another cup of tea while you write out your certificates
Job Done!
And this is Exactly how we ALWAYS do our jobs!
