RCD Issue, Tripping at half Limit...

[PhilCumbria]

Hi All

I have just done a board change at a house that i'm sure is a TT System. (The House is supplied by overhead cable to the house with an earth rod net to where the external meter is fitted).

Once I had changed the board, I did a ZE Reading and GOt 5.63 Ohms. When testing the 30mA RCDs on the board it was tripping on half limit.

Has anyone experienced this with a TT System??

 

[Octopus]

Did you have ALL the loads disconnected? If not its quite likely you have an earth fault.

 

[PhilCumbria]

Did you have ALL the loads disconnected? If not its quite likely you have an earth fault.

No, That was a 3 lead live test for ZE and then testing the RCD From a Socket Circuit..

 

[paul291277]

Does RCD test at the board (RCD) yield same reults?

 

[buzzlightyear]

No, That was a 3 lead live test for ZE and then testing the RCD From a Socket Circuit..

did you test it from farthest point.
or at the c/u!

 

[Leesparkykent]

Disconnect loads and test again at the load side of the RCD terminals.

 

[Octopus]

No, That was a 3 lead live test for ZE and then testing the RCD From a Socket Circuit..

Always best to test the RCD or RCBO's at the CU with the loads disconnected.

I would say you have a fault somewhere too.

 

[buzzlightyear]

Had an RCD go down on a customer this morning. One ring final circuit with every thing on it kitchen, front room, hallway and backroom. I split the circuit in two and found the fault in the kitchen. Line to earth fault which took 3 hrs to find.

 

[Risteard]

Had an RCD go down on a customer this morning.

That's what happens if you purchase RCDs from the brothel.

 

[buzzlightyear]

what if I put a RCD when up a customer !

 

[buzzlightyear]

That's what happens if you purchase RCDs from the brothel.

you will not get much change from them.

 

[paul291277]

Still waiting for someone to --- up with a leakage pun

 

[static zap]

what if I put a RCD when up a customer !

Stop balancing raisins on the end of your JT.

 

[westward10]

I have just done a board change that I am sure is TT. Unbelievable.

 

[Toneyz]

I have just done a board change that I am sure is TT. Unbelievable.

I have got to say after reading the O.P. and seeing the O.P. profile I agree with you there westward it would be one of the first things you would investigate before starting.