Help! Wiring for 4.3Kw cooker

[nickblake]

Nick,

There are two 32A MCBs on the consumer unit so I guess that one of those would be used for the oven. Looks like he was right when he said 2.5mm2 cable was ok! Sadly his workmanship has undermined my faith in his electrical knowledge.

Once again Nick, thanks.

you cant use a 32 amp mcb on a 2.5mm cable ,as ezziekiel has mentioned look at the manufacturer installation instruction if they do say 32 then you will need a 6 mm cable for this , what might be an idea would to contact another electrician to have a look at whats been done

 

[BluSparx]

Hi Candid where about are you if your local I can pop and have a look for you, is the guy listed on the NIC list of installers?

 

[telectrix]

Rewirable fuses look like dominos 2 coloured dots ,either white ,blue ,yellow or red , if they are MCB's the will have a number 6 a ,16 a ,20a or 32 a if they are BSEN60989 or BS3871 they will be 5a 15a 20a or 30a

and they switch on and off, not like fuses which blow and have to be replaced ( sorry nick, but i added this as the op has no electrical knowledge, as he said). personally, in my humble view, i would suggest he gets a good electrician in and has him install a 6mm dedicated cooker circuit. future proof. also. have said good electrician inspect the work so far and asvise him how to get redress via NICEIC. if we have his location,maybe he's close to one of us.

 

[Smugley]

Wouldn't 4mm be sufficiant for a 32A MCB? Haven't got my book handy so happy to be corrected.

 

[nickblake]

and they switch on and off, not like fuses which blow and have to be replaced ( sorry nick, but i added this as the op has no electrical knowledge, as he said). personally, in my humble view, i would suggest he gets a good electrician in and has him install a 6mm dedicated cooker circuit. future proof. also. have said good electrician inspect the work so far and asvise him how to get redress via NICEIC. if we have his location,maybe he's close to one of us.

dont appologies mate its a good point i have suggested he contacts another electrician

 

[telectrix]

Wouldn't 4mm be sufficiant for a 32A MCB? Haven't got my book handy so happy to be corrected.

4mmm may be ok, but why reun 4mmm when it's no more trouble and virtually negligible extra cost to run 6mm. better overkill than warm cable

 

[telectrix]

how about it, candid, what's your location?

 

[nickblake]

Wouldn't 4mm be sufficiant for a 32A MCB? Haven't got my book handy so happy to be corrected.

yes it would you are correct but im a bit old school prefer to over rate and for the length he 's doing the cost wouldnt be much differance

 

[candidcamel]

how about it, candid, what's your location?

I'm in Newcastle upon Tyne

 

[brucelee]

Hi mate

when you say you have 2.5mm T/E running round the kitchen from point to point this sounds like a ring for the sockets and if it is then the cooker should not be connected to this as it will increase the load excessively

if the cooker is over 2.3 kw then run a seperate supply 32A CB to a 45a double pole cooker switch with then to cooker outlet for the cooker using 6mm T/E

and yes the metal backboxes should have grommets fixed to prevent damage to the sheathing of the cable

 

[Smugley]

yes it would you are correct but im a bit old school prefer to over rate and for the length he 's doing the cost wouldnt be much differance

Yes I agree and always use 6mm myself too

 

[BluSparx]

For cooker circuits I always overate to 6mm to reason being is that I want to ensure my work will be ok for any changes that might potentially happen with any equipment being installed in the kitchen

 

[telectrix]

I'm in Newcastle upon Tyne

looks like a job for durham sparky!

 

[BluSparx]

Yes it a little far for me as about 50mile was thinking if was local I would have just called in whilst out and about

 

[telectrix]

And if I take the manufacturers recommendations, what size wiring do I need? 6mm2 or 10mm2?

Also, whilst I'm on...

Under regulation 522.8.1 - 'A wiring system shall be selected and erected to avoid during installation, use or maintenance,
damage to the sheath or insulation of cables and their terminations' - are rubber grommets required for steel back boxes. There is comment on this subject on these forums but there is arguement for and against. Does anyone have a definitive answer, or this just a judgement call? At the moment the sockets aren't plastered in so I can clearly see that the grommets aren't in situ.

Thanks you all for your guidance

you wouldn't leave the screws out of a socket, so why omit the grommets. they are essential, same as you say. to protect the cable.