17kw range one requires 32amp fuse, the other 45amp?

[GarethW]

I just made the table in Excel whilst refering to the BGB CCC tables !!! (My Christmas evening is very boring !!)

I don't want to prove ANYONE wrong, I just want to know if I've been doing things wrong for years.

Why can't you use a cooker switch with an integral socket and does that only apply to a circuit with an OPD over 32a ??

Gareth

 

[RF Lighting]

The OSG says you should allow an additional 5A into the diversity calclations to allow for a socket outlet on the cooker isolator.

 

[EFLImpudence]

Why can't you use a cooker switch with an integral socket and does that only apply to a circuit with an OPD over 32a ??

Not as such but deducting 5A from 32A leaves 27A.
Working diversity backwards 27A gives you 15kW.

You may have 6mm² installed in a method which would allow a 40A OPD so then the socket would be alright.

 

[Taylortwocities]

The process of applying diversity is a guide and can be applied as part of the design process.


Personally, I would not be happy installing a circuit for a 17KW cooker on a 32A CPD over 4mm² cable. Especially where the manufacturer's instruction specify a 45amp CPD.

 

[EFLImpudence]

Personally, I would not be happy installing a circuit for a 17KW cooker on a 32A CPD over 4mm² cable.

You either apply diversity or you don't.
The cable will be alright with a 32A OPD.
Do you think it will trip?

The larger the appliance, i.e. the more elements there are the better diversity works.

Especially where the manufacturer's instruction specify a 45amp CPD.

Agreed, but OP has two similar appliances and the manufacturers' instructions vary - one 32, the other 45.
Would you be unhappy installing the first to the MIs?