I installed an extra socket in a shop in East gate shopping center, could be a good 5 years work testing the rest of the mall now to confirm its reasonably safe.
Seriously, i put in section 3 what i am taking responsibility for. When the client signs their part of the COC they accept that is the case. That's why it is important for the client to sign it. They accept the limitation of what you can reasonably do. What I do take responsibility for it is tested to the letter of the SANS book.
We do a lot of shop rewires. Is a shopping centre going to let you switch of the whole mall so you can do a no load voltage test, er..no. If they won't let us switch it of at the source we put in the COC (usually on a separate attachment) that this was the case and it the responsibility of the shopping centre to ensure the suitability of the supply. They sign it, I keep a copy. They accept the limitation of what can be done, I feel you are covered.
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