5 Wires For Bosch Induction Hob??

[EFLImpudence]

Change the socket for a cooker connection plate.

However, 2.5mm² and the flex might be said by some to be a bit small - but it can be argued that overload protection may be omitted for cooking appliances and with diversity it might be acceptable.

What is the rating of the MCB covering the circuit?

 

[ReganAndCarter]

Just thought of another question. Friend who is fitting his own kitchen wants to hide the wall mounted cooker switch that is at head height (it's a cooker switch plus a single socket) in the telescopic metal cover that goes on top of hood to cover ducting. Except he's not having ducting as the Lamona hood also has the option for no ducting - just use with filters instead.

I'm thinking that when cooking, with or without hood running, there will be a lot of steam/moisture going up into hood. Will it be safe to have the cooker switch inside duct cover?

 

[ReganAndCarter]

View attachment 364658

Change the socket for a cooker connection plate.

However, 2.5mm² and the flex might be said by some to be a bit small - but it can be argued that overload protection may be omitted for cooking appliances and with diversity it might be acceptable.

What is the rating of the MCB covering the circuit?

Thanks for your reply, EFL. It's ye olde fuse - 30 amp I think, but would need to double check.

 

[EFLImpudence]

Just thought of another question. Friend who is fitting his own kitchen wants to hide the wall mounted cooker switch that is at head height (it's a cooker switch plus a single socket) in the telescopic metal cover that goes on top of hood to cover ducting. Except he's not having ducting as the Lamona hood also has the option for no ducting - just use with filters instead.

I'm thinking that when cooking, with or without hood running, there will be a lot of steam/moisture going up into hood. Will it be safe to have the cooker switch inside duct cover?

I wouldn't advise that - especially with the socket.

 

[EFLImpudence]

Thanks for your reply, EFL. It's ye olde fuse - 30 amp I think, but would need to double check.

Mmmmm. Even worse.

Can you replace the cable in the wall?

We really need the rating of the hob for a start.

 

[ReganAndCarter]

Mmmmm. Even worse.

Can you replace the cable in the wall?

We really need the rating of the hob for a start.

OK, bizarrely the rating isn't in the instruction book. Will have a look on plate on back of hob when next there and post back.

He's already got his quartz splashback behind hob up to hood, cable runs behind it. If the cable has to be replaced though, it has to be replaced.

 

[EFLImpudence]

Are you sure it is 2.5mm²?

That would be very unusual with a 30A rewireable fuse - although as it is half way up the wall presumably it has been altered before.


We need more details of the hob.

 

[ReganAndCarter]

Are you sure it is 2.5mm²?

That would be very unusual with a 30A rewireable fuse - although as it is half way up the wall presumably it has been altered before.


We need more details of the hob.

Yes, unfortunately. It is 6mm down from ceiling in wall to cooker plate at head height. Then 6mm in steel pipe conduit in wall down from plate to the old cooker. He ripped out the 6mm from plate down to old cooker and replaced it with 2.5mm with a single socket on the end behind the hob's base unit. The numpty thought he could just plug the hob in to standard socket.

He may be able to replace the 2.5mm with 6mm in the steel conduit, but he did say it was very tight to pull the old 6mm out of it. So I don't think some new 6mm will pull through easily. Otherwise may have to remove the large quartz splashback and hack his new plaster.

Still awaiting a photo of hob's spec plate. Thanks for the info.

 

[ReganAndCarter]

Are you sure it is 2.5mm²?

That would be very unusual with a 30A rewireable fuse - although as it is half way up the wall presumably it has been altered before.


We need more details of the hob.

Finally got the specs. Looks like it's 7.4 Kw. Does that make it approx 30 amps?

Bosch Hob Specs.jpg

• ReganAndCarter
• 1 Dec 2024

 

[flameport]

He may be able to replace the 2.5mm with 6mm in the steel conduit, but he did say it was very tight to pull the old 6mm out of it. So I don't think some new 6mm will pull through easily.

If it's steel conduit, it doesn't need to be T&E - you can use singles, or the inner cores from the T&E which will be much easier to pull through.

 

[FrodoOne]

Finally got the specs. Looks like it's 7.4 Kw. Does that make it approx 30 amps?

230 V / 7.4 W ≅ 31.08 A

 

[EFLImpudence]

16.3A after applying diversity.

So 2.5mm² T&E will be fine.

 

[Rodders53]

https://www.bosch-home.co.uk/en/product/00636260 appears to be 5 cores of 1.5 sq mm each from my reading of the description.

They sell a longer length and, if desired, one could get an equivalent to run through that conduit to the switch and avoid another connection point?

The plate ratings are
Cooking zone front left: 180 mm, 1.8 KW (max. power 3.1 KW)-
Cooking zone rear left: 180 mm, 1.8 KW (max. power 3.1 KW)-
Cooking zone rear right: 145 mm , 1.4 KW (max power 2.2 KW)-
Cooking zone front right: 210 mm, 2.2 KW (max. power 3.7 KW)

Bracketed number is when on 'Boost' and only one burner in each half zone is available at any one time. I rarely use the boost feature on my hob.

 

[ReganAndCarter]

Thanks again to all for your help. Relief that the splashback doesn't have to come out. My next questions -

Should we use a 30 amp standard junction box to connect the hob's 5 wires to the 2.5mm (currently terminates in a standard single socket) T&E behind the hob's base unit? Or something else?

Is my friend's plan to hide the cooker switch that isolates the hob within the cooker hood's duct cover a bad idea? As said before, the hood is likely to be used with just filters rather than connecting ducting to vent outside. I'm thinking steam/moisture may be an issue, but I don't know how much will acumulate in a hood.

May be back later to ask what diversity is.

 

[ReganAndCarter]

https://www.bosch-home.co.uk/en/product/00636260 appears to be 5 cores of 1.5 sq mm each from my reading of the description.

They sell a longer length and, if desired, one could get an equivalent to run through that conduit to the switch and avoid another connection point?

The plate ratings are
Cooking zone front left: 180 mm, 1.8 KW (max. power 3.1 KW)-
Cooking zone rear left: 180 mm, 1.8 KW (max. power 3.1 KW)-
Cooking zone rear right: 145 mm , 1.4 KW (max power 2.2 KW)-
Cooking zone front right: 210 mm, 2.2 KW (max. power 3.7 KW)

Bracketed number is when on 'Boost' and only one burner in each half zone is available at any one time. I rarely use the boost feature on my hob.

Thanks for looking up that info. Just in case, do you know what length they do of the longer cable? Is it available from Bosch, or maybe heat resistant cable from electrical suppliers?