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25A MCB on 2.5mm kitchen radial

Discuss 25A MCB on 2.5mm kitchen radial in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

J

joeyscurlock

Wired 2 new 2.5mm t&e radial circuits for a kitchen and utility room

Stupid of me not to check first but I've now tried to work out max load on the circuit and I've worked out if I was to put in a 25A MCB in place of the 20A I originally planned I should be okay. Looking at around 5500-5700W when everything is in use, roughly 23-24A.

Cables are ref method C, then run under plinths in free air

Bit worried on the loading on the cable. Can anyone clarify if I'm okay to be doing this?

Thanks
 
Before going any further with this can you clarify whether the 2 radial circuits are on separate MCBs or both connected into one MCB?
 
I can't imagine you will need 2 circuits with each needing 23-24 amps Joey? I can run my house off 40 amps, what is going to be connected to them Fella?
 
Dishwasher, fridge freezer, washing machine, coffee machine, kettle, toaster, microwave, gas hob, extractor hood and the one that is causing concern is the single oven just below 3Kw.
 
I still doubt you would pull 23 amps, that said you rightly admitted you dropped a Rollock when wiring. However 2.5mm2 will take 23-24 amps, Depending on length of run of course and Method.
 
Diversity is the key here.

How have you run these 2 circuits and divided the loads between them ? One circuit for appliances and one for sockets above counter height, or a mix of both ?

Why are you worried about the loading on the cable ? will the OCPD protect the cable ?
 
I've divided high level sockets eg counter sockets and low level appliances. I'm worried about loading on the cable, the cable deteriorating.
 
I would keep the circuits on a 20A each, try a clamp tester reading with everything on load to satisfy myself, and promise myself to stick to 32A 2.5mm rings or 32A 4mm radials next time.

I will be surprised if you get any calls for overload tripping.

You could run in a separate circuit for the oven if it helps you sleep.
 
if your calculated load of 28A is split between the 2 radials, leave trhem on 20A MCBs. sorted.
 
I had everything in my kitchen running off a 16A breaker for three years, including washer and tumble dryer, never once did it trip. And the wife is a chef so had loads of kitchen inventions on the go all at once. That said, this was not designed by me, and was 'temporary' until I got around to/could be arsed to rewire it. But I have to ask, what possessed you to run 2.5mm radials in the first place? Fine for living room, bedrooms etc., but I always have 32A circuit(s) in the kitchen and utility rooms!
 
BS 7671 radials for 13amp sockets are 20amp wired in 2.5mm2 or 32amp wired in 4mm2 why are you considering using a 25amp cb?
 
All this iffing and whatifing, if the circuit is for a specific piece of equipment, the design it properly taking into account all the variables. If the radial is for socket outlets then use a 32 amp RFC, 20amp radial or 32amp radial
 
Well credit to the OP he has admitted there mistake, now looking at ways of getting it correct with minimal inconvenience.

I am sure we would all usually install a 32 amp circuit for a kitchen, unless we knew other wise what was going to be used in it.

A 25amp MCB may just be the answer they need to sort out the problem.
 
Pete999 said:
BS 7671 radials for 13amp sockets are 20amp wired in 2.5mm2 or 32amp wired in 4mm2 why are you considering using a 25amp cb?
Click to expand...

I'm afraid i may be over 20A maybe 22-23A. I understand its not the best way around it, but I was checking if it is possible. For the cable to withstand the loading
 
I would seriously recommend the Guy stick in 2 20 amp circuits and forget all about it, well after testing certification and Part Peeing of course.
 

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