63A Cooker on 45 A wylex rewireable fuse board

[paul_griff]

My brother asked me to wire in his new cooker which sounded straightforward till I found the existing gas oven/electric hob cooker was just plugged in and found his new cooker took 63 A before applying diversity. No spare circuits on old 6 way wylex re-wire able fuse consumer unit, with a 45A fuse on the incomer. Told him that he needs a new consumer unit fitting.
Anyone got any other thoughts on this?

 

[paul_griff]

Just a thought, is there an existing cooker circuit in the board? Seen a socket slapped on the existing 6mm for a plug in cooker. Apply diversity and you will get it on a 32A breaker

No afraid there is not. Even then with the 45A fuse on the incomer in the board I think it is still too borderline if any power is used in the rest of the house, for example 3000 W instant boiling water kettle will bang an extra 13A on each time it is used, add that to the cooker and you at 40A

 

[SPARTYKUS]

Go for the whole she-bang, RCBO every circuit. Make it a beauty.

 

[paul_griff]

Go for the whole she-bang, RCBO every circuit. Make it a beauty.

Glad you agree, didn't know if I was just being a bit over cautious about the crappy old board. Think I would go for split RCD board to keep the cost down (and raise the inconvenience)

 

[Engineer54]

Your first action is to get the DNO to up-grade your service supply!! That cooker by the way, will never see 63A, double oven or not!! lol!! Yes do a CU up-grade, it sounds like this house is due an up-grade, i take it that all the existing circuits are in good condition??

The Wylex 3036 CU's were and never have been ''crappy'', they may have passed their usefulness as such, compared with modern CUts, but have given good service to literary millions upon millions of electrical installations in the UK (and overseas) over the last 50+ years or so!!
With the conversion to HRC fuse carriers, the fault level protection is far greater than any modern MBC protected CU.... As far as i remember the domestic Wylex CU were generally rated at 60A not 45A, but i think you may have been referring to the service cut-out fuse in your thread title!! ...lol!!!

 

[Knobhead]

They were definitely 60A E54.
They were the best we had available at the time and as you say once upgraded to HRC’s just about bomb proof.

 

[Deleted member 9648]

If I recall..some wylex CU's had a separate 45a way for a heating supply....it was used for installations with the then popular ceiling heating systems. It was not a incoming supply fuse but a fuse way separate from the main bank.....check it out,if so it may do your cooker.

 

[paul_griff]

Your first action is to get the DNO to up-grade your service supply!! That cooker by the way, will never see 63A, double oven or not!! lol!! Yes do a CU up-grade, it sounds like this house is due an up-grade, i take it that all the existing circuits are in good condition??

The Wylex 3036 CU's were and never have been ''crappy'', they may have passed their usefulness as such, compared with modern CUts, but have given good service to literary millions upon millions of electrical installations in the UK (and overseas) over the last 50+ years or so!!
With the conversion to HRC fuse carriers, the fault level protection is far greater than any modern MBC protected CU.... As far as i remember the domestic Wylex CU were generally rated at 60A not 45A, but i think you may have been referring to the service cut-out fuse in your thread title!! ...lol!!!

The 45 A fuse is not a DNO fuse, it is part of the wylex board so no need for DNO upgrade. I realise the cooker will never pull 63a but it may pull around 27a which is still a big load on a board fused at 27a

I agree that the wylex CU's were a great product for millions, every property I have lived in has had one at some point. I have been told that the rated fault current of these is roughly half of modern CU's don't know if this is true?

 

[Deleted member 9648]

]The 45 A fuse is not a DNO fuse, it is part of the wylex board [/B]so no need for DNO upgrade. I realise the cooker will never pull 63a but it may pull around 27a which is still a big load on a board fused at 27a

I agree that the wylex CU's were a great product for millions, every property I have lived in has had one at some point. I have been told that the rated fault current of these is roughly half of modern CU's don't know if this is true?

I've never seen a wylex CU with an incoming fuse.....see my post no 21.

 

[paul_griff]

I've never seen a wylex CU with an incoming fuse.....see my post no 21.

Aah, thank you, that makes more sense. I had never seen this arrangement before and just had a quick look when I took the cover off and thought it was on the incomer due to its position in the board. ( I was visiting my brother for the weekend and did not want to spend too much time on it)
your reply seems to explain it and hopefully give a solution, I am back there next week so will have another look.