House DB main switch

[Justloadit]

Personally I would prefer that the Neutral be isolated as well.

I remember a case many many years ago, in which a cable to a 3 phase training bench was wired incorrectly, they used one of these trailing cables which did not use standard colours, and the bench had a 3 pole isolator, the Neutral was incorrectly connected to a live line, one of the students was horsing around, and had make a connection to the training bench with a cable, and had got himself in a situation in which he was being shocked. The other students switch off the isolator, but because the Neutral was not switched off, it did not help. Fortunately they managed to disconnect the supply cable and were able to prevent the electrocution.

This was an invaluable lesson to me, and I always insist that any 3 phase connection/installation done for me, must have either an isolator of ELCB that switches off Neutral. I just feel a bit more comfortable with this knowledge of complete isolation, in the case of a fault.

[ians]

This would confuse the local sparkies. I assume this is a pic of a DB used in the USA not in SA by the colour code. Black live and blue neutral with an exposed bussbar at the bottom. My kind of DB nice and neat.