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J

jordanclarke

Hi Forum-ers,

I was hoping someone can help me, as I'm stepping out my normal line of work to help a friend.
I'm an electrical fault finder on the railway, but previously did some industrial work and so have BS 2391.
My friend is installing a small kitchen in a shop, the shop fitter has handed him some paper with the following circuits for the cookers, extractor fan and fridges, as follows:
A/ 3KW (Cooker/Grill)
B/ 3KW (Heating area)
C/ 5KW (Cooker/Grill)
D/ 13A Spur 1KW (extractor fan)

There is already a ring main for the fridges.

So my question is- I believe the A/B/C/ can run off a 45A breaker with 10mm cable (run of 5m), which feeds a double pole isolating switch, but is it ok to feed three items off of one isolating switch? I thought there might be a limit of two?
And does the fitter intend to take the spur for D/ off of this one isolator also?

While I am in the electrical field, I don't have much experience with thiese sorts of installations so couldn't really explain it to my friend, so really appreciate any help you can offer.
 
you could take D as a spur from the ring. as for A/B/C i would run a separate radial for each, each with it's own isolator.
you can then use 4mm or 6mm for each.
 
As Tel says mate, but you will need RCD protection. I would do as tel says, but fit a seperate consumer unit with RCBO's for each circuit, this is not the cheapest solution, but if you fitted a RCD protected CU you would loose all circuits if you had a fault, the RCBO route would just trip the offending circuit.

Cheers...........Howard
 
why RCDs, Howard, unless cable is buried in walls? it's fixed equipment.
 
touche.
 
cheers for your replies lads. I'll go with radials then. Though I might skip the RCD equipment as running the cables in surface mounted steel conduit.

appreciate your advice!!
 
one more thing please, if i use the 6mm cable i was gonna use 32A mcb for the 5KW and for the 3KW a 25A mcb. does this sound right to you??
 
The 3 KW heating radial could be run in 2.5mm with a 20 amp mcb if prefered and a double pole switch if its a fixed load

Another method of wiring this area is as found in ready made chip shop ranges
A seperate consumer unit fed by a sub main with circuits local to the loads
It may be more adaptable for any alterations to the cooking area,adding display lighting etc
 

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