I own the company, I personally do the testing with the assistance of one of my electricians, I sign the COC, its done to the best of my ability. I sleep well at night.
I have only done CoC's on extisting installation 3 times in the last 12 years. I only generally do CoC's on my own work.
Currently doing a CoC now as a pay back for a client who gave me enough work to get through lock down (the job sucks). It passes now we corrected a few things, but I don't like it but I also can't fail it - it complies with SANS 10142 but not to own fussy standard. I am getting a letter from the AIA inspector that says he is happy with my CoC (he has inspected the whole building). I am covered.
Just do it right and cover your own arse.
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