If an external high level air-con unit has a rotary isolator positioned next to it, is it good practice to wire the isolator so that it disconnects both L. and N. of the supply?
Z.
(b) possibly will be maintained by someone who may be accessing from outside the building (i.e. outside the influence of the main bonding) - and the risk of a potential difference between N and Earth (rather than PE / MET) is greater. The risk is
So on TN, especially PME, systems, if we're isolating the N, should we be isolating the PE conductor too?
- Andy.
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