RCD not tripping on test.

[mattpolhill]

Hi all.
Changed a board the other day and the RCD's not tripping on test.Changed the RCD and still not tripping.Did a ramp test and still no luck.Tested the RCBO's and they don't trip either. There's no MET at the incoming supply just a 10mm earth bond going down into the wall, so has to be a TT system .Ze was 56 ohms. Any ideas?

 

[MDJ]

have you checked your tester?

 

[telectrix]

disconnect loads and test rcd's at the device itself.

 

[Octopus]

Biting my lip.

Is there any bonding to the water and gas?

 

[dim_bulb]

Do they trip when you push the functional button?

 

[bigbaddave]

The last time i had this problem i had my tester set on time delayed RCD.

 

[dim_bulb]

If you have rcd board at home try you're tester again there, it is set on 30ma?
mine does 10,30,100etc

 

[mattpolhill]

Yeah.Bonded it myself.

- - - Updated - - -

Tried that.

 

[Octopus]

Are you sure you had ALL the loads off when testing the RCD and RCBO's?

 

[dim_bulb]

And....does it trip you're rcd at home then?

 

[mattpolhill]

Only on my own board.No problem. Took the RCD from my board too.

 

[mattpolhill]

Yeah.I put a spur from the board and tested just that.No luck!!

 

[Octopus]

Got a photo of the board, cover off, you can post?

 

[mattpolhill]

Yeah. no problem

 

[mattpolhill]

No i haven't

 

[DNS1]

Tell me you actually had the supply switched on when you tested...

 

[mattpolhill]

Ha! Ha! yeah i did!!!