MCB tripping - why?

nafuk · 2009-12-29T10:41:08+00:00

Hi, the MCB on my split circuit consumer unit is trippingsporadically, sometimes when nothing is connected to the downstairssocket circuit. The MCB protects the RCD protected circuits (upstairsand downstairs sockets, cooker, hot tank, kitchen sockets). The hottank and cooker circuits are turned off at the rcd and are notconnected used/connected light (non-RCD'd) circuits stay onwhen the RCD trips.Please can someone tell me what causes an MCB to trip, other thanovercurrent, and not trip an RCD, and hopefully some possible thingsto check in order to locate the fault.This 'may be' heating associated but does happen when the heating isoff and the boiler is off i.e. could it be associated with hot pipesnear a cable?Many thanks.

Dec 29, 2009 20 Replies

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tabbypurr 9 years ago

Ah. I wouldn't expect a 6A mcb to be powering a 16A capable cable, so no, doing that would be unwise. What power is this water heater?

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MCB tripping - why?

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