I read on another post here that the DNO only alows something daft like 16A per house when planning a housing estate network..
ColJack said:I read on another post here that the DNO only alows something daft like 16A per house when planning a housing estate network..
Eh? A non-faulty 9.5kW shower, even on full chat, will definitely trip a 32A breaker, even on 1mm² cable.John_D said:A 9k5 shower on stage 1 heating will probably not trip a 32A breaker on a 6mm cable
ColJack said:and why do we not apply diversity to showers like we do cookers.?
you only use it for 10-30 mins a day so even if it does get a little warm in use then it has plenty of time to cool down.. it's not like it's constantly overloaded for hours at a time...
normally I would recomend 10mm² for anything over 9kW anyway, i'm just curious..
In that case the cable could carry up to 46A, which isn't enough for a 10.8kW load.scotster said:I have followed the cable all the way back to the CU and it is in hollow spaces (clipped against joist or stud).
...which would de-rate the rable.Stud walls are currently empty although I was intending to inustlate the new shower stud walling where the cabling obvioulsy runs for a short way.
No, because the non-fusing/non-tripping current of the MCB is required to be 13% greater than the design current (i.e. > 1.13 x 45A). In any case, running an MCB at or near its limit for long periods will cause it to overheat, and eventually weaken.The shower CU has a swicth breaker of 45A but the fuse in the unit is only rated at 40A. Could I swap that out to 45A if needed?
Softus said:No, because the non-fusing/non-tripping current of the MCB is required to be 13% greater than the design current (i.e. > 1.13 x 45A). In any case, running an MCB at or near its limit for long periods will cause it to overheat, and eventually weaken.
Softus said:In the Wiki.
I believe that both parameters are given in BS EN 60898-1:2003, but I don't have access to a copy.ricicle said:I would like to know where that factor of 1.13 was taken from.
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I've used the 1.45 factor but never seen the 1.13
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