Indeed, although the usual way would be to confirm polarity and cpc continuity live with a simple Zs test. (Although this would be done even if it was a Class II accessory, unless the lighting circuit had no cpc of course.) Where an RCD was installed, it would also be prudent to verify its operation. It could be recorded on the invoice or not, but the testing and verification should still take place regardless.
I don't think "not" is good, as it means charging for undocumented work.
As I said, I'm not necessarily talking about a 'certificate' - but I do expect any work done for me (in any field) in return for my money to be documented in some way, and if the work involves 'tests', I expect that documentation to include the test results. I would regard failure to provide any documentation to be very unprofessional, and potentially 'suspect'.
I bet you're popular at your local car wash.
I get an 'itemised' till receipt, which indicates the type of wash I have paid for, and on what date! If my car were damaged by the wash, you can be sure that that would be part of the 'evidence' I would present when seeking compensation.
If it's 6mm², then it is almost certainly fine. As has been said, there should be a certificate, but whether you 'push for it' is really up to you.
Indeed. I stated that it was difficult to see how this could not be considered a new circuit even though the wiring for it was existing.
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