Cooker install - RCCB tripping

[DarrellA]

Morning all,

I'm Having an issue with a cooker install and wonder if anyone can help.
Every time the cooker is switched on there is a RCCB trip (Rated at 80a 30Ma). The circuit will take a supply but no load of any kind. I connected a DeWalt charger to the socket on the cooker plate (only drawing 0.85a) and it still trips. The rest of the ring main/lighting circuit has no issues and tests with no problems.

Testing path -
Tested appliances, all good.
New cable run, thought it may be a neg earth fault due to a rogue screw/nail so replaced the cable again.
Removed all other connections in the distribution board so only the cooker was connected, same problem.
Swapped out the 40a breaker.
Swapped out the cooker connection plate.
All polarity & resistance checks out.

Scratching my head here, any help would be appreciated.

Thanks,
D​

 

[telectrix]

N in wrong bar in CU ???

 

[Pete999]

Morning all,

I'm Having an issue with a cooker install and wonder if anyone can help.
Every time the cooker is switched on there is a RCCB trip (Rated at 80a 30Ma). The circuit will take a supply but no load of any kind. I connected a DeWalt charger to the socket on the cooker plate (only drawing 0.85a) and it still trips. The rest of the ring main/lighting circuit has no issues and tests with no problems.

Testing path -
Tested appliances, all good.
New cable run, thought it may be a neg earth fault due to a rogue screw/nail so replaced the cable again.
Removed all other connections in the distribution board so only the cooker was connected, same problem.
Swapped out the 40a breaker.
Swapped out the cooker connection plate.
All polarity & resistance checks out.

Scratching my head here, any help would be appreciated.

Thanks,
D​

When you say all Polarity and Resistance checks OK what where the IR readings? and was the cooker ON when you tested L to E and N to E, and at what voltage setting did you use on your MFT

 

[Taylortwocities]

I guess this is a new circuit? If so, your solution has been posted by Telectrix above #2

 

[Octopus]

So it's a new circuit and falls under part - have you consulted your CPS support line?

 

[buzzlightyear]

Morning all,

I'm Having an issue with a cooker install and wonder if anyone can help.
Every time the cooker is switched on there is a RCCB trip (Rated at 80a 30Ma). The circuit will take a supply but no load of any kind. I connected a DeWalt charger to the socket on the cooker plate (only drawing 0.85a) and it still trips. The rest of the ring main/lighting circuit has no issues and tests with no problems.

Testing path -
Tested appliances, all good.
New cable run, thought it may be a neg earth fault due to a rogue screw/nail so replaced the cable again.
Removed all other connections in the distribution board so only the cooker was connected, same problem.
Swapped out the 40a breaker.
Swapped out the cooker connection plate.
All polarity & resistance checks out.

Scratching my head here, any help would be appreciated.

Thanks,
D​

you have replaced the cable again .so did you not do ir on the circuit to see which leg was giving a fault .

 

[Nigel]

Sounds like a faulty RCCB.

 

[Taylortwocities]

Sounds like a wrong connection.

 

[buzzlightyear]

Go on op you can have another go .they say third time lucky.stick another cable in .

 

[Octopus]

Sounds like a faulty RCCB.

Not sure I agree with that ....

 

[Taylortwocities]

Sounds like a faulty RCCB.

Oh yes, lets change everything. RCCB, cable, cooker, isolation switch, etc
Probably there will be the same result.

What is needed is a change in the level of competence.

 

[telectrix]

could even be a N-E reversal in the cooker switch/socket.

 

[DPG]

Post up your test results for us to have a look at.
(stop sniggering Murdoch).

 

[Marvo]

Disconnect the circuit, do the usual dead tests and post results.

 

[Nigel]

Not sure I agree with that ....

What evidence do you have to make you not agree?

If the OP is to be taken of his word there is nothing left to be faulty.

 

[Nigel]

Oh yes, lets change everything. RCCB, cable, cooker, isolation switch, etc
Probably there will be the same result.

What is needed is a change in the level of competence.

What a boring forum it would be if everyone knew everything. There would not be much debate would there?

 

[Octopus]

What evidence do you have to make you not agree?

If the OP is to be taken of his word there is nothing left to be faulty.

I'm guessing but as this is a new circuit added, then we have to presume the RCD wasn't tripping before ............

In the absence of any meaningful test results we can only speculate.

 

[Pete999]

I'm guessing but as this is a new circuit added, then we have to presume the RCD wasn't tripping before ............

In the absence of any meaningful test results we can only speculate.

The OP has gone notably quite, at work maybe?

 

[telectrix]

probably gone to buy some cable and a RCD.

 

[Octopus]

OP did view the thread at lunchtime ............ no updates ........ as yet