I have a question that I would like to get some feed back on.

Here in New Zealand, it is standard practice, and endorsed by the regulations, to wire up domestic switchboards using a main isolating switch as opposed to using a circuit breaker, relying on the presence of pole fuses to protect the switchboard. I am inclined to the view that, for the very modest extra cost, using a main MCB instead of an isolator would be quite a sensible practice. Admittedly, switchboard faults are rare, but the thought of a whole switchboard being destroyed because of a fault that a main breaker could have interrupted concerns me just a bit. Also, it is not totally unheard of for pole fuses to be either overrated or to have been mistakenly replaced with solid links and at least a main breaker would provide insurance against this.

Comments, anyone?

Last edited by Paulusgnome; 06/18/07 04:59 PM.

Mark aka Paulus