MCB Tripped

[MrMannering]

The MCB supplying my cooker has tripped, if I try to switch it on the RCCB Trippe's.

As the isolator to the cooker is dead, I removed the faceplate and did a continuity test (sons tester) between Live and neutral, live and earth and earth and neutral. Got a light and a buzzer from the meter every time. Is this a problem?

Cheers.

 

[PrenticeBoyofDerry]

Depends!
How did you conduct the test?

 

[oharaf]

Which tripped first RCCB or MCB? is the cooker on its own dedicated circuit?

performing a continuity test is good, however you need to disconnect the switch (if it has a neon in) and ideally remove the live, neutral and earth for the circuit at the consumer unit.

This will allow you to test the cable without any loads in circuit.

If you now do continuity beween LN LE NE and you get a reading then that piece of cable has failed.

There is still the cable on the load side of the switch which is connected to the cooker, this will need disconnecting from the cooker and continuity tested again.

The cable will also need an Insulation Resistance test, you will need specialist test equipment for this


There is a good chance it is an appliance failure.

Really you need an electrician in for this.

 

[ColJack]

switch the cooker isolator off and then try to reset the mcb and rccb..
if it stays in then your cooker is faulty and you need it repaired or replaced..

if it doesn't stay on even with the cooker isolator off then it's a wiring fault and you need to get a sparky in to take a look at it for you..

 

[MrMannering]

I disconnected the wires from the isolator, put the feed wires in a 30 amp chocblock to keep them apart, then switched on the MCB which caused the RCCB to trip.

Have not disconnected anything from the CU yet. But given the above result it would appear not to be the oven that is at fault I am thinking.

I am still getting continuity between the live and neutral coming from the CU.

Thanks for help thus fare

 

[MrMannering]

Had to nip out and visit the wife in hospital Any suggestions of what to do next?

 

[flameport]

Either the cable from the consumer unit to the isolator is damaged

or

something else is attached to the cable between the consumer unit and the isolator (there shouldn't be, but anything is possible). Have any other appliances, sockets or lights stopped working?

 

[MrMannering]

Either the cable from the consumer unit to the isolator is damaged

or

something else is attached to the cable between the consumer unit and the isolator (there shouldn't be, but anything is possible). Have any other appliances, sockets or lights stopped working?

Nothing else is off, the cooker is the only thing in this circuit. The hob is gas and the ignition is not effected.

Thanks for all the help so far from everyone.

 

[ColJack]

time to call in the men with the test equipment then...

 

[MrMannering]

time to call in the men with the test equipment then...

Thought that might be the case. But am not going to do it for a few days, am enjoying the home delivery (don't tell the wife) Chinese meals too much.

 

[ban-all-sheds]

You can't eat that stuff for days on end - you need a proper balanced diet.

Curry & pizza as well.