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Topic Title: electronic earth leakage trips
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Created On: 15 July 2017 06:27 PM
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 15 July 2017 06:27 PM
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kellyselectric

Posts: 137
Joined: 22 July 2016

One of my little hobby's is collecting old plugs and adaptors(yes I know I'm sad/need to get out more) anyway my mate brought be a couple of 5 amp 2 and3 pin adaptors and decided to try them out I have a suitable plug board which is protected by a plug in electronic RCD. Unfortunately 2 of them had some internal arcing going on I tried to wiggle the plug to see if I cud stop it and the breaker tripped this happened several times the load used to test was a frequency counter of similar vintage its got a mains filter built in why did it trip there's no oviouse path to earth other than the caps to earth in the counter
 15 July 2017 07:59 PM
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geoffsd

Posts: 1660
Joined: 15 June 2010

Just to be sure - you mean the RCD tripped.

You say there is arcing in the adaptor - L to E ? , or

N and E touching ?


Try wiggling a plug with no load connected.
 15 July 2017 08:52 PM
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kellyselectric

Posts: 137
Joined: 22 July 2016

Yes I mean the RCD tripped sorry shud of made that clearer. I think the arcing is in both lines in series with the load. There is no arcing between lines both adaptors are totally dry inside and reasonably clean a little corrosion in one but that's all
 15 July 2017 09:32 PM
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geoffsd

Posts: 1660
Joined: 15 June 2010

Ok. I see now.

I think you will just have to put it down as one of those things that just happens - like sometimes RCDs trip when something is switched OFF - cured by fitting a new switch.
 16 July 2017 06:59 PM
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kellyselectric

Posts: 137
Joined: 22 July 2016

I did some more testing today I fitted a 5amp plug to a bit of flex and a 15watt pygmy bulb plugged it into the troublesome adaptor and no matter what I did the RCD didn't trip also the arcing didn't seem so loud. Next I took the earth off of the plug of the frequency counter and again no tripping as soon as I touched the earth wire to its terminal I could provoke a trip.also the arcing noise on a nearby radio was really intensified by touching the earth on its terminal.
 17 July 2017 12:01 AM
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geoffsd

Posts: 1660
Joined: 15 June 2010

That would seem to indicate a faulty counter.

Can you not pinch together the contacts in the adaptors to eliminate them?
 17 July 2017 01:05 AM
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kellyselectric

Posts: 137
Joined: 22 July 2016

Its possible the counter is faulty it must be around 50 years old by now rather than risking breaking an old adaptor I just swapped it out with a other one which is much better behaved
 17 July 2017 09:41 AM
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Zoomup

Posts: 3209
Joined: 20 February 2014

Originally posted by: kellyselectric

Its possible the counter is faulty it must be around 50 years old by now rather than risking breaking an old adaptor I just swapped it out with a other one which is much better behaved


Yes, internal electronic components may be leaky after so much time. Capacitors are notorious for breaking down when old.

Bye,

Z.
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