Cooker tripping?

[shadewakka]

Kitchen rewired via council contractor, two months ago.

Old cooker kept tripping due to them installing a 32amp breaker from 40amp.
this cooker only tripped when using the oven and 2 hob rings.

Client bought new cooker - god knows why but there we go - two months ago.
now today the oven is working and three hob rings, when the fourth is switched on it trips the 32amp circuit

cooker 7.5kw - 6mm cable.

Idea's ?

Cooker is new - working fine until today when same problem emerged as previosuly
New cabling - was fine when tested by the other contractor and myself previosuly

I will say that before the kitchen was rewired there was no problems with the electrics or appliances at all and was working perfectly, kitchen only rewired due to a new kitchen been fitted.

All idea's appreciated

 

[monjoor]

Faulty breaker?

 

[telectrix]

what installation method for the 6mm cable? MCB could have got tired if it's been overloaded and tripped a few times. clamp meter on the feed, see what the cooker draws?

 

[MDJ]

Could also be a problem with the supply, probably loose wires in a JB somewhere since barry the kitchen fitter got his hands on it, when the load starts on the cable it is shorting out to earth somehow, well maybe, who knows with these charleton kitchen fitters these days?

 

[Darkwood]

Check the mcb clamp is not on the wrong side of the busbar pin when it was fitted to the board this will give you similar characteristics of tripping under heavy loads that may not exceed the mcb rating ... if im correct you have some explaining to do for not checking it before signing the install off... it may not show up on testing as it may still have a pressured contact but not clamped.

 

[markc123]

Kitchen rewired via council contractor, two months ago.

Old cooker kept tripping due to them installing a 32amp breaker from 40amp.
this cooker only tripped when using the oven and 2 hob rings.

Client bought new cooker - god knows why but there we go - two months ago.
now today the oven is working and three hob rings, when the fourth is switched on it trips the 32amp circuit

cooker 7.5kw - 6mm cable.

Idea's ?

Cooker is new - working fine until today when same problem emerged as previosuly
New cabling - was fine when tested by the other contractor and myself previosuly

I will say that before the kitchen was rewired there was no problems with the electrics or appliances at all and was working perfectly, kitchen only rewired due to a new kitchen been fitted.

All idea's appreciated

................

 

[G1BBO]

It has a terrible power factor :banghead:

 

[GLENNSPARK]

Kitchen rewired via council contractor, two months ago.

Old cooker kept tripping due to them installing a 32amp breaker from 40amp.
this cooker only tripped when using the oven and 2 hob rings.

Client bought new cooker - god knows why but there we go - two months ago.
now today the oven is working and three hob rings, when the fourth is switched on it trips the 32amp circuit

cooker 7.5kw - 6mm cable.

Idea's ?

Cooker is new - working fine until today when same problem emerged as previosuly
New cabling - was fine when tested by the other contractor and myself previosuly

I will say that before the kitchen was rewired there was no problems with the electrics or appliances at all and was working perfectly, kitchen only rewired due to a new kitchen been fitted.

All idea's appreciated

and before it was rewired was it on 3036s?

 

[i=p/u]

Il diagnosis and fix it, it's what I do.

 

[markythesparky]

Stick a 40a MCB in.

 

[MDJ]

7.5 KW cooker? with Diversity I would say stick a 20 in lol

 

[Pete999]

The OP is saying with cooker on full load it trips 32 a cb 7500/230 = 32.6 a only just over but?????

 

[GLENNSPARK]

The OP is saying with cooker on full load it trips 32 a cb 7500/230 = 32.6 a only just over but?????

but what?...should hold for 1.45X its operating current for upto an hour before letting go....

 

[GLENNSPARK]

Kitchen rewired via council contractor, two months ago.

Old cooker kept tripping due to them installing a 32amp breaker from 40amp.
this cooker only tripped when using the oven and 2 hob rings.

Client bought new cooker - god knows why but there we go - two months ago.
now today the oven is working and three hob rings, when the fourth is switched on it trips the 32amp circuit

cooker 7.5kw - 6mm cable.

Idea's ?

Cooker is new - working fine until today when same problem emerged as previosuly
New cabling - was fine when tested by the other contractor and myself previosuly

I will say that before the kitchen was rewired there was no problems with the electrics or appliances at all and was working perfectly, kitchen only rewired due to a new kitchen been fitted.

All idea's appreciated

does it only do it when the fourth hob ring is turned on?

what i mean is it doesn`t do it with any other configuration of applied loads?

is the circuit on an RCD?