Help with Oven Circuit.

[makken]

Have an existing oven circuit 6mm2 twin & earth from the consumer protected by a 32a mcb goes to a cooker control switch, then 6mm2 from the switch was hardwired in to previous oven. Just bought a brand new oven (single oven that fits in cupboard under worktop) specifications are 2.3kW total electric consumption, max cable length 2m, it specifies for the cable type 3 x 1.5mm2 or equivalent.
Is it ok to wire this one the same 6mm2 straight in to the back of the oven?

 

[somersetsparks]

Well with 2.3kw total consumption, I would say yes. I seem to remember some lengthy discussion on a similar subject last week?

 

[tigerpaul]

Dont forget to derate the breaker!

 

[makken]

Thanks for the quick replies, what size breaker should i size down to?.

 

[somersetsparks]

16A. If the oven has a plugtop on it, you could just terminate the old 6mm to the cooker into a single socket, thus leaving the circuit and fuseboard intact, as well as the oven, as the 13a fuse in the plugtop will provide the protection.

 

[Richard Burns]

The breaker should be fine for that cable, 32A on 6mm is basically usual for cookers.
Your cooker is a low load since it is just an oven and so long as the connectors on the oven are big enough to take 6mm you should be fine.

 

[ACL]

Thanks for the quick replies, what size breaker should i size down to?.

For a total load of 2.3 kw, without diversity you could use a 10A MCB.
What does it say in the instruction manual?
If you leave too high a circuit breaker in place, then the oven won't be protected should a fault occur.

 

[cbw]

WHAT THE BLOODY HELL IS GOING ON HERE?????

Breakers are for protection of cables!!!

Stop giving such rubbish advice!!!!

 

[Richard Burns]

For a total load of 2.3 kw, without diversity you could use a 10A MCB.
What does it say in the instruction manual?
If you leave too high a circuit breaker in place, then the oven won't be protected should a fault occur.

Remember that the MCB protects the cable not the appliance.

 

[cbw]

RB....Perhaps that was put beter than my coment ....But what basic stuff!!!!!!!!!!!!!!!!!!

 

[somersetsparks]

BUT.... You could argue that if you hard wire a 1.5mm2 flex into a cooker switch/outlet, then this is part of the circuit so a lower rated MCb will be required to protect the Cable not the appliance

 

[ACL]

Remember that the MCB protects the cable not the appliance.

I agree except that he's been told to use 3x 1.5mm cable to connect the oven. If he can't get the 6mm into the oven connections, should we not also protect this bit of the cable too?

 

[Richard Burns]

@CBW
Good thing for people to know and a good if slightly OTT response, at least they know now!!

 

[Richard Burns]

BUT.... You could argue that if you hard wire a 1.5mm2 flex into a cooker switch/outlet, then this is part of the circuit so a lower rated MCb will be required to protect the Cable not the appliance

I agree except that he's been told to use 3x 1.5mm cable to connect the oven. If he can't get the 6mm into the oven connections, should we not also protect this bit of the cable too?

The OP asked if the 6mm could go directly into the oven, the 3x1.5mm is the recommended minimum cable size and was not in this case intended to be used.

 

[cbw]

The circuit terminates at the outlet plate.

Thereafter follow MFI and the appliance, its cables and components will be protected by its own fuses/trips etc