Dodgy RCD?

[mcs.serv]

hi, I'm a forum virgin ,so, be gentle

Just changing board, ( supplied by customer, B&Q special). Performed all testing prior to removing old board, everything spot on!
Fit & connect new board, test RCD 1 side ok

RCD 2 Side: Trips on non trip loop Zs & .5 RCD test

Shower, upstairs ring & immersion heater on rcd 2

TT earth

I'm thinking dodgy RCD. Looking for guidance & reassurance

Many Thanks

 

[Hawk81]

Did you do ramp test on rcd?

 

[mcs.serv]

Yes ramp tested. tripped with no time reading

 

[Electro-tech]

A misplaced neutral , I take it you have tried RCD with individual or all circuits isolated,although IR tests would have found if there was a wiring imballance.Are you testing RCD at the board.? Swap the RCDs with each other.!

 

[Electricalserv]

If it gave no reading on a ramp test its a faulty RCD. Ramp test the other RCD aswell.

 

[telectrix]

try swopping the RCDs round and see if the fault moves to the other side. if it does, suspect RCD.

 

[mcs.serv]

Ok thanks for help. Will double check everything & see how it goes

Cheers

 

[Dunc]

Disconnect all loads and try testing it. If it still trips on half test then it's likely to be faulty and require replacement. Seems to be a lot of dicky RCDs out there at the moment especially from the cheap brands. Had a spark mate of mine phone me yesterday with a story about a brand new CED one that went bang when he did the functional test. Had a sore finger afterwards apparently.

 

[Engineer54]

Nah Never!!! RCDs/RCBOs hardly ever fail!! Very reliable bits of kit they are,

...Well according to some on here anyway!! lol!!!

 

[VoltzElectrical]

anyone got any thoughts on compensation for time fault finding and replacing faulty brand new kit?

 

[telectrix]

only if it was made by electrium.