Single or DP RCBO (Debate continued, split from "old fuseboard" thread)

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mainline

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Andy™ said:
at least with an RCBO board, and fault will only take out the affected circuit and not half the circuits
Click to expand...
That would only be true when using DP Rcbos

I have split these posts (From "Need help, old fuseboard changed...........") so the debate can continue. They will only serve to confuse the OP
 
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It's quite easy to talk at cross purposes here. The point about RCBO boards is the N's are joined upstream of the RCBO test coils that look for the imbalance.
Whether SP or SP with switched N this doesn't change.

That said, SPSN (DP) RCBOs are much more convenient for testing and fault finding and all new boards I fit use them.
 
Tim Howard said:
It's quite easy to talk at cross purposes here. The point about RCBO boards is the N's are joined upstream of the RCBO test coils that look for the imbalance.
Whether SP or SP with switched N this doesn't change.
Click to expand...
That’s true but a DP rcbo will isolate the circuit that causing the trip where as an SP one won’t.
 
I used to think that DP RCBOs were more essential than they in fact are.
Detection is the same.
A L-E fault is isolated.
An N-E fault that isn't isolate by a SP RCBO will on many installations just be duplicating a TN link in the head. (There are exceptions of course!)
I'm more recently thinking that the main people who like them and benefit from them are us electricians!
 

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