2: ISOLATE (DISCONNECT ELECTRICITY FROM) THE CIRCUIT YOU WILL BE WORKING ON
The safest approach is to switch off the ‘Main Switch’ of your Consumer Unit (CU) or fuse board, thereby switching off all electricity in your house.
There isn't always a main switch, its fairly common, particularly in older places, to have several fuseboards that need turning off before everythings isolated.
Interesting point - it's so long since I saw such an installation (even though I was 'brought up' on them!) that I had overlooked that possibility. I'll think about how the wording could be adjusted to accommodate such situations.. Thanks.
PLEASE NOTE: I have now posted the second draft in a separate thread, so would be grateful if any further comments could be made in that thread. Thanks.
Kind Regards, John
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