Induction hob.

[Bogart]

And one more question . Is there anything to stop me running the hob in 3 phase even though I have 3 CU each on a different phase? I was intending having a 20 Amp MCB in each for the hob. The hob is split into 3 zones so I
assumed, rightly or wrongly , that this was permissible.

 

[Sintra]

No no and no again. You can not do that.

 

[Deleted account]

And one more question . Is there anything to stop me running the hob in 3 phase even though I have 3 CU each on a different phase? I was intending having a 20 Amp MCB in each for the hob. The hob is split into 3 zones so I
assumed, rightly or wrongly , that this was permissible.

Wrongly.

You need to be able to isolate or switch off instantly at the same time.
Even more important is disconnection in the event of a fault.

 

[DPG]

I think you would be wise to get a sparky in to be honest.

 

[James]

to summise,

Yes you do need to be able to isolate the supply
reg. 464 + 537

also, being a hob that could start a fire if it were to overheat,
reg 465 would apply.

just to make life simple and easy, get a spark in and they will do all the worrying about compliance with the regs (30 seconds thinking time)
then put in a supply that is both safe and functional.

 

[Bogart]

Okay how about a 4 pole RCD located to the side of the CUs and a 4 pole isolator located near the hob?

 

[Bobster]

Okay how about a 4 pole RCD located to the side of the CUs and a 4 pole isolator located near the hob?

Have you a copy of BS7671?

Still no, the circuit needs 1 overall point of isolation, which if you're taking it from 3 different CU's it obviously can't have.

 

[telectrix]

Okay how about a 4 pole RCD located to the side of the CUs and a 4 pole isolator located near the hob?

sledgehammer and nut comes to mind.

 

[DPG]

sledgehammer and nut comes to mind.

Something definitely comes to mind!

 

[Bogart]

I give up if you cannot give a sensible answer why bother at all!!!

 

[DPG]

I give up if you cannot give a sensible answer why bother at all!!!

I apologise for my post, but you have been given the most sensible answer a while ago - you need an electrician.

 

[telectrix]

IT'S A BLOODY HOB, ffs. NOT A DOCKSIDE CRANE. JUST INSTALL A SINGLE PHASE 32a CIRCUIT USING 6.0MM CABLE

 

[James]

IT'S A BLOODY HOB, ffs. NOT A DOCKSIDE CRANE. JUST INSTALL A SINGLE PHASE 32a CIRCUIT USING 6.0MM CABLE

11Kw on 32A?

 

[telectrix]

11Kw on 32A?

diversity applies here. average current will only be about 21A

 

[Bogart]

Diversity , you have never seen my missus cooking. The hob has a total of nearly 16kw of cooking area but the load is limited by the hob to 11kw so the total current could be around 50A so a 32A circuit not exactly ideal. Hence my wanting to spread it over 3 phases.