Hob and 2 single ovens on 6mm cable.

[Meggerman]

Hi Guys. Got a kitchen jobs coming up and there is only a 6mm out to hob oven at the mo. New oven specified is 7.4kw and there is 2 single ovens at 3.4Kw each. Total Plate load is 14.2Kw. When I looked at job I thought I would run in another supply. But working it out with diversity all 3 will be 28.52A. I will be putting them on separate isolation switches. Seems close, but ok with regs. Have any of you done similar, Must say I have never heard of an overload issue on 32A cooker circuits before but......./

 

[shanky887614]

Hi Guys. Got a kitchen jobs coming up and there is only a 6mm out to hob oven at the mo. New oven specified is 7.4kw and there is 2 single ovens at 3.4Kw each. Total Plate load is 14.2Kw. When I looked at job I thought I would run in another supply. But working it out with diversity all 3 will be 28.52A. I will be putting them on separate isolation switches. Seems close, but ok with regs. Have any of you done similar, Must say I have never heard of an overload issue on 32A cooker circuits before but......./

New oven alone is rated at 30a.

I wouldn't do it.

 

[Meggerman]

Why not? You are not applying any diversity at all?

 

[MDJ]

Why not? You are not applying any diversity at all?

Up to 15 kW is fine IMO allowing for diversity, never had 3 myself on a single supply but it looks okay, well I think so lol

 

[shanky887614]

Why not? You are not applying any diversity at all?

On one cable I mean

 

[Octopus]

The only problem I can foresee is the client changing one of the cookers or the hob later for a higher rating and then frying the cable!

 

[shanky887614]

The only problem I can foresee is the client changing one of the cookers or the hob later for a higher rating and then frying the cable!

Especially if they go for induction

 

[Meggerman]

Murdoch, there is a 32A MCB fitted, cable is protected against overload. Besides, If they do that that is not my responsibility. I will note on EIC what appliances are connected. Xmas day could be an issue I guess but I will have been paid by then and am not in breach of regs.

 

[Meggerman]

It is an induction hob. Do different diversity calcs apply to induction hobs then?

 

[Octopus]

Murdoch, there is a 32A MCB fitted, cable is protected against overload. Besides, If they do that that is not my responsibility. I will note on EIC what appliances are connected. Xmas day could be an issue I guess but I will have been paid by then and am not in breach of regs.

Good luck daisy chaining the 3 outlets!

 

[Octopus]

It is an induction hob. Do different diversity calcs apply to induction hobs then?

That's an incredibly interesting point!!

Sure you wouldn't be using all the rings at the same time, BUT judging by the noises ours makes, they are not on/off like normal hobs!

 

[Paul.M]

I would play this one safe and put in another 6mm for the 2 x 3.4Kw single ovens. You said it yourself "Christmas day will be interesting". Nothing wrong with the regs or what everyone has said, but we all know that you will be getting a call the first time the customer has a big family get together to show off their new kitchen for a Sunday dinner when the Yorkshire puddings are flat because the fuse "thingy" keeps tripping.

 

[GLENNSPARK]

Hi Guys. Got a kitchen jobs coming up and there is only a 6mm out to hob oven at the mo. New oven specified is 7.4kw and there is 2 single ovens at 3.4Kw each. Total Plate load is 14.2Kw. When I looked at job I thought I would run in another supply. But working it out with diversity all 3 will be 28.52A. I will be putting them on separate isolation switches. Seems close, but ok with regs. Have any of you done similar, Must say I have never heard of an overload issue on 32A cooker circuits before but......./

whats the length of run & the cable installation method please...

 

[Paul.M]

whats the length of run & the cable installation method please...

Good point, its a kitchen so should not be that far away BUT???

"The local fuse box is in the double garage just next door to the horse stables some 50m away! Its also a PME, is that a problem?" LOL


For a customer with this amount of ovens and hobs, I dont think I'm too far from my above tongue in check post.

 

[GLENNSPARK]

I would play this one safe and put in another 6mm for the 2 x 3.4Kw single ovens. You said it yourself "Christmas day will be interesting". Nothing wrong with the regs or what everyone has said, but we all know that you will be getting a call the first time the customer has a big family get together to show off their new kitchen for a Sunday dinner when the Yorkshire puddings are flat because the fuse "thingy" keeps tripping.

and if method C would you stay at 32A?