sham
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- Reaction score
- 72
MCBS are for short circuits. There has been cases of Live and Neutral touching and it just trips the MCB and not the RCD. It seems that the regs are saying we can't rely on the zs being low enough to help trip the MCB in time which may cause the cable to be permanently damaged or appliance, but we still have protection of persons and livestock by the use of RCDs. This is my thoughts at the moment.