A 1.00mm LED lighting circuit can use a 3A MCB, as the current draw will not get near to 3A. My LED lighting circuit draws 1.3 A max - I used an amp clamp with all lights on. Using a 6A mcb would reduce the possibility of a warmish MCB/RCBO and still protect the cable, one of its two prime functions. I always try to fit MCB/RCBO/fuses as low a value as possible, to give added protection in fault conditions on connected appliances.You should size your mcb to the correct one to protect the circuit, or am I missing your point?
Let’s say a standard new board with maybe 10 rcbo’s (not thinking AFDD yet) Nothing extreme load like a weed farm, but normal…. How much heat generated? How much power consumption? And would say a half module blank between each one would help?
The specs for MCB and RCBO energy consumption were posted by Aron B. Good idea, I did think of spacing out RCBOs to dissipate heat, if there is enough space in the CU. Unfortunately I have no surplus ways.
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