shower priority unit positioning

[toadman]

hi everyone, I'm in the process of converting an outbuilding into a granny annex which will have an electric shower installed I've been told I'll need a shower priority unit positioned in the main house next to the cu which will then feed the annex shower directly without need to involve the cu in the annex, what armoured cable will I need to supply both the annex cu for all the other circuits and shower independently , thanks

 

[James]

I have not got time to look in depth into it.
however my thoughts, right or possibly wrong as you have pointed out.

An isolator is a means of removing power from a circuit to allow amongst other things, work to be safely carried out on it.
a contactor by its very nature may bring power back to the circuit if it receives power to the coil, this may be from an automatic device like a thermostat or a remote switch.
I for one, would only rely on a contactor for isolation of a circuit i was working on under some very specific circumstances. and also, I have yet to see a contactor that has a means of locking off.

 

[nicebutdim]

Maybe not the wisest place for this discussion.

 

[James]

yes, @nicebutdim I hadn't considered that.
perhaps if anyone wants to discuss it further then a new thread would be better.