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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> RCD tripping in shed https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1366465138 Message started by graham on Apr 20^th, 2013, 2:38pm

Title: RCD tripping in shed
Post by graham on Apr 20^th, 2013, 2:38pm

i have an RCD with a 6A and 16A trip in my shed, its been in less than a year.i went to use my bandsaw yesterday and it tripped out.
it was quite stiff from lack of use so i put it down to that.
it still tripped out when i disconnected the drive belt.
i also have 2 lathes, one tripps but tho other doesnt.
if i connect the units to my garage unit with an extension lead they work fine.
just wanted to know if anything else could cause this before i get a new RCD unit fitted.

Title: Re: RCD tripping in shed
Post by Lectrician on Apr 20^th, 2013, 5:14pm

Is it the RCD that is tripping, or the B16 MCB?

Title: Re: RCD tripping in shed
Post by graham on Apr 20^th, 2013, 6:16pm

its the RCD thats tripping, lights work fine but its seems to be hit and miss with electric motors,some work some trip out the RCD.
could it be effected by condensation,i have noticed mould spots on the ceiling board,the shed has no air vents in it.

Title: Re: RCD tripping in shed
Post by Lectrician on Apr 21^st, 2013, 8:04am

If it is the RCD tripping, and it only happens when gumfy equipment is used, it suggests a N to E fault of high-ish impedance on the load side of the RCD.

You would need an insulation resistance tester and a sparky who knows how to correctly use it :)

Is the RCD in the shed consumer unit?

Title: Re: RCD tripping in shed
Post by graham on Apr 21^st, 2013, 3:01pm

picked up a new RCD and fitted it, same thing.
tested the sockets with a plug in tester and it said they were ok.
i disconnected a couple of sockets and everything was fine.
left one socket off and just connected the wires with block connectors and it all works.
it was either a faulty single socket (which i have not refitted ) or the wires to a double socket which i reconnected after .