That the sort of domestic installation I was brought up on. I'm not sure when CUs, as we now know them, first came into being, but I suspect that it was late 60s or early 70s - but very many installations without them persisted for a long time after that.Just been asked to look into doing some work in this flat.
I'm not aware of any regulation which actually compels one to have a CU or DB, in the normal sense. Indeed, in some situations it might still possibly make more sense to have multiple enclosures containing single protective devices!Hey, who needs a Consumer Unit anyway…..???!!!
So all those cables from the cut out, meter, to the henleys, feeding the switch fuses should be capable of pulling 100amps
So all those cables from the cut out, meter, to the henleys, feeding the switch fuses should be capable of pulling 100amps
They should be of a size that will carry enough fault current to operate a 100A fuse should a short circuit occur at the end remote from the fuse!
Which is a whole different thing!
Sounds like the same thing to me..!
Ie the fuse should go before the cable melts.
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CU are optional [/img]
Did you mean to write that? If that really were 'automatically deemed', we presumably wouldn't 'waste our time' measuring Zs or circuits with OPDs (i.e. virtually all circuits), would we? Or am I misunderstanding you?If we protect a cable against overloads its automatically deemed to be protected against faults....
But that installation hasn't only got single-device units.Take the point about seperate protective devices, I guess no reason why not when you think about it !
Sounds like the same thing to me..!
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