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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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RCD tripping
One of the RCDs in the split consumer unit tripped yesterday. It was the
side I'd previously had a problem with concerning the lighting wiring. Not a good time for a wiring check... However, a quick check turning off and then on each MCB in turn on that side showed it wasn't the lighting wiring. I'd got out a 10" desk fan which hadn't been used since last summer, and that had been on an hour when it tripped the RCD. Resetting the RCD and turning on the fan had it tripping again in a few minutes. I've just dismantled the fan (not easy - many hidden plastic catches and unreachable circlips) and put it on in free air. After an hour the outside of the windings were at 87 deg C, and the laminations furthest from them were at 67 dec C. I assume that if left on the enamel on the wires would have reached a high enough temperature to fail and rubbed against the laminations (which are earthed), so tripping the RCD. Fortunately, I've always got a couple of spare fans and the tip is now open for electrical goods. -- Jeff |
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