Cooker tripping

RichHol · Sunday at 9:45 PM

Jock from the north said:
If its an older house or flat is it the same colour of cable at cooker switch to that of consumer unit ie red black ,blue brown

Jock from the north said:
Loose connection maybe .continuity could confirm this

Blue brown. Thanks for your help. I'll has the electrician

Jock from the north said:
Loose connection maybe .continuity could confirm this

RichHol · Sunday at 9:48 PM

RichHol said:
Blue brown. Thanks for your help. I'll has the electrician

Thankyou

RichHol · Sunday at 9:50 PM

Jock from the north said:
Simply increasing size of mcb to 40 may make things worse.if it's say a 8 kw cooker then a 32 amp mcb would not trip the circuit .you can allow diversity to cookers .

I gave him the make and model of cooker. He said the total amps was 35. That's why he changed from 32 to 40.

Jock from the north · Sunday at 9:52 PM

RichHol said:
Thanks Jock. Hadn't heard of continuity test. I wondered if it might be the wire being nipped by screws on new kitchen Units. The house also had a rat in it during covid. It had an electric safety check and the electrician tested the cooker circuit with high voltage meter. He says that woukd show any weakness in the cable. If it's not the cooker, the cable or the breaker, could it be anything else?

It would show weakness in the insulation ,the neutral or live could be hanging by a thread if something has damaged it

Jock from the north · Sunday at 9:58 PM

RichHol said:
I gave him the make and model of cooker. He said the total amps was 35. That's why he changed from 32 to 40.

Total amps is 35 but you would normally allow for diversity .10 amps of total load plus 30 percent of remaining load.a 32 amp would normally work fine with that unless the cooker is being used to heat the room or being used all at once every time being used which is highly unlikely.is there a socket on cooker switch if so add another 5 amps on to calculation

RichHol · Sunday at 10:02 PM

Jock from the north said:
Total amps is 35 but you would normally allow for diversity .10 amps of total load plus 30 percent of remaining load.a 32 amp would normally work fine with that unless the cooker is being used to heat the room or being used all at once every time being used which is highly unlikely.is there a socket on cooker switch if so add another 5 amps on to calculation

It might be being used all at once. I have seen the tenants cooking and all hobs and both ovens were on.

Jock from the north · Sunday at 10:08 PM

RichHol said:
It might be being used all at once. I have seen the tenants cooking and all hobs and both ovens were on.

Even then cookers work in a way that thermostatically all the rings and oven are never on at same time ,maybe for 1 minute or so .plus a 32 amp mcb wouldn't overload at 35 amps .plus most cookers nowadays will give you total load but for instance you can't have grill and oven on at same time.i really don't think that's your problem.see what your electrician comes back with when he does his continuity tests
Assuming 35 amps hasn't been flowing thru mcb for a considerable amount of time

RichHol · Sunday at 10:11 PM

Jock from the north said:
Even then cookers work in a way that thermostatically all the rings and oven are never on at same time ,maybe for 1 minute or so .plus a 32 amp mcb wouldn't overload at 35 amps .plus most cookers nowadays will give you total load but for instance you can't have grill and oven on at same time.i really don't think that's your problem.see what your electrician comes back with when he does his continuity tests

Thanks Jock. Appreciate your help

Jock from the north · Sunday at 10:18 PM

RichHol said:
Thanks Jock. Appreciate your help

No worries. Hope you get it sorted

RichHol · Monday at 8:01 PM

Jock from the north said:
No worries. Hope you get it sorted

Hi Jock. These are images of the breaker. The cooker is the smudged writing. It seems that it will trip with just 1 hob on for a period. Thanks

Jock from the north · Monday at 8:55 PM

RichHol said:
Hi Jock. These are images of the breaker. The cooker is the smudged writing. It seems that it will trip with just 1 hob on for a period. Thanks

Thanks.because it's a combined mcb and rcd [rcbo] it could be tripping due to a neutral fault .if the cookers new then each part of the circuit would need to be tested and tested with cooker cable removed from rcbo ,switch would need to be disconnected as well as cooker outlets.check for plate screws incase it's nipped a neutral or live ,it's easy done.also if it's metal boxes check for grommets in back boxes ,make sure no basic insulation is touching or even close to metal knockouts . At furthest point in circuit check for any voltage on neutral wire this should be close to zero , .it should be easy to identify using a low reading ohm metre [a multi function tester] connect the live and earth together at consumer unit and then test between live and earth at cooker switch ,take note of result.repeat the process with the neutral, the results should be exactly the same say 0.12 ohms.do this with every part of circuit ,switch down to cooker out let [if there is one ] is it a free standing cooker or is there a separate hob and oven on same circuit/switch maybe the oven is the problem ..when your happy with readings then you can do a insulation resistance test on each part of circuit .be carefull that your cables are removed from rcbo ,switch neon if there is one and most important cooker oven . Then test between live to earth ,live to neutral and neutral to earth .you can do this at 250 volts .it could also be an issue with another circuit possibly.make sure your electrician does this as he will have the proper tester and safety equipment

RichHol said:
Hi Jock. These are images of the breaker. The cooker is the smudged writing. It seems that it will trip with just 1 hob on for a period. Thanks

Jock from the north · Monday at 9:12 PM

RichHol said:
Hi Jock. These are images of the breaker. The cooker is the smudged writing. It seems that it will trip with just 1 hob on for a period. Thanks

Sorry when your sparky tests for voltage on neutral this should be from neutral to earth

RichHol · Monday at 10:37 PM

Jock from the north said:
Thanks.because it's a combined mcb and rcd [rcbo] it could be tripping due to a neutral fault .if the cookers new then each part of the circuit would need to be tested and tested with cooker cable removed from rcbo ,switch would need to be disconnected as well as cooker outlets.check for plate screws incase it's nipped a neutral or live ,it's easy done.also if it's metal boxes check for grommets in back boxes ,make sure no basic insulation is touching or even close to metal knockouts . At furthest point in circuit check for any voltage on neutral wire this should be close to zero , .it should be easy to identify using a low reading ohm metre [a multi function tester] connect the live and earth together at consumer unit and then test between live and earth at cooker switch ,take note of result.repeat the process with the neutral, the results should be exactly the same say 0.12 ohms.do this with every part of circuit ,switch down to cooker out let [if there is one ] is it a free standing cooker or is there a separate hob and oven on same circuit/switch maybe the oven is the problem ..when your happy with readings then you can do a insulation resistance test on each part of circuit .be carefull that your cables are removed from rcbo ,switch neon if there is one and most important cooker oven . Then test between live to earth ,live to neutral and neutral to earth .you can do this at 250 volts .it could also be an issue with another circuit possibly.make sure your electrician does this as he will have the proper tester and safety equipment

Fantastic Jock. Thankyou

HappyHippyDad · Tuesday at 6:45 AM

RichHol said:
Hi Jock. These are images of the breaker. The cooker is the smudged writing. It seems that it will trip with just 1 hob on for a period. Thanks

The picture on the left shows a blank missing on the far left.
This is very dangerous.
Do not put your fingers in that hole.
You need to get an electrician to put a blank there immediately.