Could you please let me know why electricians use RCD and RCD/MCB s at the same time on the switchboard?
RCD/MCB
- Thread starter Teddytod
- Start date
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MCBs ("fuses") provide overcurrent protection and protect the cable from overheating/setting fire
RCDs provide Earth leakage detection ie where power is going somewhere other than where it should (L->N) eg L>E, N>E
RCDs provide Earth leakage detection ie where power is going somewhere other than where it should (L->N) eg L>E, N>E
Actually I mean, RCD/MCB (RCBO) protects circuit against Earth leakage and over-current at the same time, so why between main switch and RCD/MCB, electricians again use RCD?
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You don't tend to use RCBOs and seperate RCDs together. RCBOs are more expensive than MCBs but provide earth leakage protection for the individual circuit they are on. 1 RCD plus MCBs are cheaper but all circuits on the same RCD will go down if it trips.
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