63amp rcd

[StopTapBob]

63 amp Rcd protecting 3 circuits 2 x 32 amp breakers and one 16 amp. Is it ok to add a 50 amp mcb for shower also. How do you calculate the maximum load on the Rcd ?

 

[gamblor6]

63a is what its rated at, hence your worry, it really depends on the actual loading on these circuits, also, why 50a for a shower?

 

[telectrix]

if possible, to save uprating the 63A RCD to 100A, fit RCBO for the shower. that is if you have a CU capable of this.

 

[StopTapBob]

Its a 10.5 kw shower (45.65 amp) so need a 50amp breaker.

 

[pushrod]

If those breakers are all going on the same rcd then there is a very good chance that they are going to "cook" it, depending on what the real load of those other circuits is. A cooker and kitchen ring, along with that shower will be curtains for that rcd.

80A ones will give you more leeway and are a fairly common size depending on make eg WYLEX but larger ones in some makes can be a real pig to find, or they don't fit .


Edit : looks like we are not able to link to TLC now - that link should have taken you to an 80A 30mA rcd for £23 ex vat.