New shed circuit tripping RCD at house consumer unit

[Octopus]

If the RCD in the summer house is tripping its more than likely one of the circuits from the summer house CU is faulty.............

EDIT : Old thread alert.

 

[Pauldicker]

If the RCD in the summer house is tripping its more than likely one of the circuits from the summer house CU is faulty.............

I took them all out and put one circuit in at a time then took it out and tried the next one. each one tripped. Its possible that theres water intrusion somewhere but not on every circuit, but it does mean ripping out the garden and decking.

 

[Octopus]

I took them all out and put one circuit in at a time then took it out and tried the next one. each one tripped.

That's not the way to go about fault finding..... when you say "took them out" - what did you take out?

 

[Pauldicker]

That's not the way to go about fault finding..... when you say "took them out" - what did you take out?

I removed each mcb after isolating the supply then reconnected one mcb at a time. Trying to narrow it down.

 

[Octopus]

I took them all out and put one circuit in at a time then took it out and tried the next one. each one tripped. Its possible that theres water intrusion somewhere but not on every circuit, but it does mean ripping out the garden and decking.

The only thing you should be getting out is your MFT, a pad and a pen....

 

[Octopus]

I removed each mcb after isolating the supply then reconnected one mcb at a time. Trying to narrow it down.

What do you mean by took out MCB? Did you just disconnect the live from the MCB?

 

[Pauldicker]

What do you mean by took out MCB? Did you just disconnect the live from the MCB?

Now the whole circuit L,N,E and tried each circuit on its own.(there are 4) water feature, disconnected pond, decking lights & summer house sockets.

 

[Octopus]

Hum ......... did you test the RCD?

You should always leave the CPC connected to the CU...

 

[Pauldicker]

Hum ......... did you test the RCD?

No i will probably do a ramp test when they get back from their hols in a few weeks. And an ir test on the swa feed in

 

[Pauldicker]

Hum ......... did you test the RCD?

You should always leave the CPC connected to the CU...

Its got to have been there 10-15 years. And working fine up until a month ago. So im thinking water somewhere.