I was just about to install a sub panel in my 3 unit apt bldg. I wanted to check another panel on a different floor and noticed the neutral bus bar was bonded to the panel box.
I can understand the reason why this was done but thought it was a definite NO NO in sub panels???
My main panel the neutrals and ground are connected, the ENTIRE building is 2 wire bx cable, no legit copper ground anywhere just the metal armor.
So now what? Do i install my other sub panel (which contains a ground bus but I have no wires to put in it) and bond my neutral bus to the box again? I get it needs a path to the main but other than doing it wrong really what option is there when I have 14-2 and 12-2 bx cable everywhere? Or just remove the neutral bus bonds and rely on the bx alone originating from the main to keep a ground connection - basically any advice on the best of 2 evils Thanks!
I can understand the reason why this was done but thought it was a definite NO NO in sub panels???
My main panel the neutrals and ground are connected, the ENTIRE building is 2 wire bx cable, no legit copper ground anywhere just the metal armor.
So now what? Do i install my other sub panel (which contains a ground bus but I have no wires to put in it) and bond my neutral bus to the box again? I get it needs a path to the main but other than doing it wrong really what option is there when I have 14-2 and 12-2 bx cable everywhere? Or just remove the neutral bus bonds and rely on the bx alone originating from the main to keep a ground connection - basically any advice on the best of 2 evils Thanks!