Re: RCD keeps tripping
Originally Posted by
Judd
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Not necessarily, the RCDs in consumer units tend to react quicker because if a faulty appliance is plugged into an plug-in RCD, the fault current has to travel through the plug-in in order for it to operate by which time the main RCD will have triggered.
We had that scenario play out at work. Something was tripping out the sub RCD unit in the kitchen area. The electrician who the company used to install all the electrics when we first moved in many years go, gave us plug in RCD's so we could see what kitchen appliance was causing the trouble.
Turned out it was a couple of things BUT with regards to the RCD, the plugin RCD tripped, the RCD on the sub unit tripped AND the RCD on the main consumer unit tripped. I was like, what the hell, shouldn't only the plugin RCD have tripped!!
We eventually found out that if the kettle was used, the amount of amps on the kitchen circuit exceeded the 20amp rating of the MCB. This MCB decided to go faulty and stay in the off position, the lever would not stay in the on position. Electrician came out, replaced the faulty MCB and put a 30amp rated one in it's place. Not had an RCD trip since.