Hob and oven single supply cable

[amlu]

fuse it down to whatever that 6mm cable can safely carry, inform the customers that it "may" trip when overloaded, and if it does and they not happy with it then is a bigger job to upgrade the circuit...

 

[Octopus]

Because we were refurbishing the house completely, I ran 10mm T&E from the board to the isolator!

 

[eggandspoon]

Thanks for all the input - on reading this thread and other forums I,ve come to some conclusions please correct me if I'm wrong

2 appliance can come from 1 supply - as long as within 2 m of isolator and diversity and cable factors allow it ?

If the manufacturer states a OCPD of x this should be done and therefore may require a separate supply or split with a local cu - but if not done it should be OK ?

If oven say 3kw comes with flex and a plugtop fitted - fit socket or spur to supply ?

If oven does not come with flex and/or plugtop say 3kw can be connected direct to supply ? Using appropriate flex say 1.5mm

Overriding factor is that cooking appliances are fixed loads and do not need ocp the MCB should be matched to the supply cable which will provide short circuit protection. ?

Diversity and the fact that loads cycle on and off should ensure that a B MCB would not trip even at full load for a short while ?


Please add your comments:smiley2:

 

[Midwest]

Can't do that multi quote thing, so; 1) Yes. 2) Amendment 3 says we should 'take account of manufacturers instructions', but you are designing the circuit for the load. 3) Never come across a 3kw appliance with a fitted plug top? 4) Appendix 15 (I think its 15) suggests appliances above 2kw, should be on their own radial circuit. 5) Not sure what you saying here? 6) Yes in essence.

 

[eggandspoon]

Can't do that multi quote thing, so; 1) Yes. 2) Amendment 3 says we should 'take account of manufacturers instructions', but you are designing the circuit for the load. 3) Never come across a 3kw appliance with a fitted plug top? 4) Appendix 15 (I think its 15) suggests appliances above 2kw, should be on their own radial circuit. 5) Not sure what you saying here? 6) Yes in essence.

Hi thanks for taking the time to reply.

3) some ovens ive have a pretty fitted moulded plug, some have flax some don't



4) seems to cancel out 2 appliances on same circuit !

5) cooking appliance are fixed loads and therefore should not be capable of overloading the correctly sized cable attached to them that matches the load The circuit MCB does not have to be designed to match the appliance cable - only the supply cable and will !provide overload protection for supply cable and short circuit protection for entire circuit.


Ultimately I was trying to get some definitive answers for most situations.

 

[Midwest]

3) I've never come across an 3kw appliance with a BS1363 plug, but if you have then I'm prepared to be convinced. And some ovens come with a connecting cable, some don't (mostly those requiring 4mm& above).
4) Appendix 15 refers to connecting 2kw appliances to ring final circuits (page 453 BYB). You can connect more than one appliance to one circuit, so long as it is designed correctly.
5) Yes

 

[davesparks]

3) I've never come across an 3kw appliance with a BS1363 plug, but if you have then I'm prepared to be convinced.

Not sure if they still do them but screwfix used to sell a 3kW Stanley industrial looking fan heater with a moulded 13A plug on it.
I've replaced a few sockets for a customer who bought a job lot of them.

 

[Midwest]

Blimey, plug a few of those into your ring will get the cables humming!

 

[davesparks]

Yes it did!
With everything else they had in the building they got L1 up to ~125A on a 100A service (L2 ~40A, L3 ~20A)