Maybe, but that was not the case with the one I'd bought.
One doesn't need to be an electrician to 'know'/do that. The isolator I'd bought was the same make and model as the one the guy used, ws still sealed in it's original box, and had been bought through a 'proper channel' (documented by an invoice I could have shown him.
Maybe, but the problem seems to be that the suppliers presumably don't seem to feel they can trust their employees to judge whether or not a product they're offered is a brand new and legitimate one obtained from a reputable source.
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