UK Induction hob

[Bogart]

Have still not installed my Neff induction hob but is near. Was originally going to use 3phase but got battered on here so no. I have a 3 phase supply at home with 3 seperate Hager CUs. Red phase does the kitchen area, ring, lighting and a circuit marked cooker which fed a dual oven in 10mm2 via a 32 amp mcb. There is no RCD on the incomer just a 100 Amp switch. The sockets are via a 32amp RCBO, the lights via a 6amp MCB and the cooker via a 32 amp MCB. The original dual oven is to be replaced by 2 seperate ovens each of 13 amp max demand so total worse case is 26amp. The induction hob is limited to a maximum of 11kw approx 50 amp max. Easiest would be to run induction hob off the 10mm2 via an RCBO and run a 2.5mm2 from an RCBO to the ovens. Problem is I cannot find a 50 amp Hager RCBO. So could I run 2 of them in parallel? Alternatively change the 100amp switch for an RCD? Only problem I see here is Hager only do a 2 pole RCD with a 30mA trip at 63 amp max. If I want a bigger size 80 amp or 100 amp I need to go to a 100mA trip. Or should I just change the red phase cu?

 

[Bogart]

Is there any insulation though?

None, no insulation at all plasterboard below floorboards above.

 

[DPG]

None, no insulation at all plasterboard below floorboards above.

But method 100 is covered with insulation. I think I'm missing something here.

 

[telectrix]

as there's no insulation, 100 and 101 are not applicable by definition

 

[davesparks]

Have still not installed my Neff induction hob but is near. Was originally going to use 3phase but got battered on here so no. I have a 3 phase supply at home with 3 seperate Hager CUs. Red phase does the kitchen area, ring, lighting and a circuit marked cooker which fed a dual oven in 10mm2 via a 32 amp mcb. There is no RCD on the incomer just a 100 Amp switch. The sockets are via a 32amp RCBO, the lights via a 6amp MCB and the cooker via a 32 amp MCB. The original dual oven is to be replaced by 2 seperate ovens each of 13 amp max demand so total worse case is 26amp. The induction hob is limited to a maximum of 11kw approx 50 amp max. Easiest would be to run induction hob off the 10mm2 via an RCBO and run a 2.5mm2 from an RCBO to the ovens. Problem is I cannot find a 50 amp Hager RCBO. So could I run 2 of them in parallel? Alternatively change the 100amp switch for an RCD? Only problem I see here is Hager only do a 2 pole RCD with a 30mA trip at 63 amp max. If I want a bigger size 80 amp or 100 amp I need to go to a 100mA trip. Or should I just change the red phase cu?

No you can't take a phase from each seperate CU to feed the appliance.
No you can't connect two protective devices in parallel, especially not with residual current devices.
No you cannot use anything other than a 30mA residual current device to satisfy the requirements of additional protection. The regulations specify 30mA protection as this is the highest value at which most healthy people will probably survive an electric shock.

Unfortuantely your understanding of the electrical regulations and electrical safety seems to be lacking to the point that you could put yourself or others in serious danger so the best advice we can give you is to recommend that you engage an electrician to carry out the work.

 

[SparkyChick]

I'm going to close this thread.

@Bogart , whilst we don't approve of members giving this advice, there is a time and place for it to be given and that time is now.

It appears from having a read of this thread that you lack the knowledge and understanding to conduct this work safely, therefore the best advice any professional on these forums can give you is to seek out the services of a qualified local electrician. We have a directory section (Find an Electrician | Electricians Directory - https://www.electriciansforums.net/local-electricians/), you may be able to find one there. Failing that get a couple of recommendations from family, friends and colleagues.