Not so fast
The only criticism I have of JF is that he didn't properly scope out the ability of the electricians - even that is assuming he was the one who employed them. Most ordinary electricians I have had to deal with are quite frankly numpties.
Also, it is the management's job to assess possible impact on the company not his. Especially when they went directly against his advice on replacing the kit. It seems they didn't even want to know what the risks were, let alone how to manage them.