My incoming supply fuse has been uprated to 100A. As well as one CU with a 100A RCD, there is also two separate 63A RCDs each with their own fused switch for outside services. These RCDs are connected in parallel with the CU, directly to the output side of the meter. Is their rating OK, given that their only protection from the power station is the supplier's 100A fuse?
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RCB v.s. Main fuse rating.
- Thread starter beano1939
- Start date
what mcb's are powered from them?
That's fine then as both 40A and 60A are less than the rating of each 63A RCD.
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