I'm changing the case on the consumer unit - replacement for broken one guv, honest - and in replacing all the original internal bits it may coincidentally become a full 17th edition box.
Before I reconnect everything I want to do a sensible set of circuit tests, that I can record. I have a query or two re insulation testing.
For rings and single function radials (oven, immersion etc) I can be fairly confident that nothing sensitive is connected, and insulation test at 500V for L-E, N-E, L-N. For lighting circuits, which include electronic items like microprocessor dimmers and 12v halogen PSUs, disconnected only by single pole switches, I'm a bit wary about using 500V testing. Other options would seem to be to test just at 250V, or to temporarily connect line and neutral and test to earth at 500V. Any thoughts?
Finally, I have mains/battery smoke detectors on their own single 6A circuit. The mains feed in 1mm T&E goes to the first detector, and thence onward in 3&E. Should there be an isolator (FCU or similar) before the first detector, and if not what are the implications here for insulation testing?
Thanks for any advice,
Charles F