Wiring for New Electric Hob - 4 wires

John White · Nov 21, 2018

Brought a new hob Russell Hobbs (RH60EH402B) because the old one was cracked. New one seems to have four wires, but the old one only had 3. I think I need to pull out the oven to get access to the box that the wires feed into. Do you think I will I be able to connect the new hobs wires easily into this box?

buzzlightyear · Nov 21, 2018

seek a spark .

John White · Nov 21, 2018

You are right of course that probably is the best idea but I really wanted to learn how to do it myself.

John White · Nov 21, 2018

You are right of course that probably is the best idea but I really wanted to learn how to do it myself.

buzzlightyear · Nov 21, 2018

Can you repeat that

Wilko · Nov 21, 2018

Hi John, you've mentioned it has 4 wires so it's possibly set up so the load could be put across 2 phases on low current installations (more common elsewhere in Europe). The instruction manual should have a diagram for you to study, looking a bit like this. But I don't recommend you try "learning by doing" for your first cooker. It's important for safety to get the earth set up correctly to the appliance and prove that it's connected back to your main earth terminal, for example

.

[ElectriciansForums.net] Wiring for New Electric Hob - 4 wires

littlespark · Nov 21, 2018

Wilko beat me to it. I just found that instruction manual.

Its common with electric hobs to have these extra cables for other electrical systems as suggested.
I've just refitted an existing Beko hob into a new kitchen worktop that has a 6 core flex. Luckily they are all crimped into pairs so I know which is which.

John White · Nov 21, 2018

After spending half a day making the hole bigger in the worktop for the new hob, the thought of unscrewing the oven as well and messing around with that was not appealing. So I thought I would try connecting the old wire that I had disconnected from the old hob into the new hob (silly me)

Switched off the electricity for the whole house,

The new hob has four ports for the wires, Earth, L1, L2 and N.

Connected earth/blue/yellow cable into earth socket, brown into L2 and blue into N as per instruction manual. Manual showed black going into L1 but of course this was the old cable so that one was missing.

Probably not a great idea I know. Anyway the hob powered on, but I could only get heat from the two front rings heated up.

Have I damaged the hob? Would wiring it up properly really be that difficult?

MDJ · Nov 21, 2018

Very likely to be 3 feeds to the hob and a neutral, but it isn't really good practice to attempt it if you are unsure to be honest.

littlespark · Nov 21, 2018

Unscrewing the oven shouldn't be a huge job. 4 screws in the front maybe, and then it slides out the cabinet. Also power off for this.

If it can be unplugged or disconnected, lift it completely out of the way so you can get in to the hob supply cable.

You will need to connect the 4th cable there to bring on the other 2 rings.
DO NOT just bridge across from the brown in L1 to L2. The size of the individual cores of the cable supplied and already connected to the appliance is critical.

Also, did you mean Earth/GREEN/ yellow? not blue

John White · Nov 21, 2018

Thanks littlespark, yes I meant Earth/GREEN/ yellow

Great so I will probably get the oven out tomorrow and have a look at least. If I have to call an electrician at least that part is done.

Good to confirm the hob isn't damaged, thank you.

telectrix · Nov 21, 2018

John White said:
After spending half a day making the hole bigger in the worktop for the new hob, the thought of unscrewing the oven as well and messing around with that was not appealing. So I thought I would try connecting the old wire that I had disconnected from the old hob into the new hob (silly me)

Switched off the electricity for the whole house,

The new hob has four ports for the wires, Earth, L1, L2 and N.

Connected earth/blue/yellow cable into earth socket, brown into L2 and blue into N as per instruction manual. Manual showed black going into L1 but of course this was the old cable so that one was missing.

Probably not a great idea I know. Anyway the hob powered on, but I could only get heat from the two front rings heated up.

Have I damaged the hob? Would wiring it up properly really be that difficult?

guess that as you have done it is almost right. with the connections as you have said,link L1 to L2, then try that. sounds like L1 feeds 2 rings and L2 feeds the other 2.

littlespark · Nov 21, 2018

Tel... I don't think he should just link L1 and L2 at the hob as the size of the cable may not be adequate to carry all 4 rings.

Replace the 4 core flex as that came supplied with the hob and connect both brown and black to L in the cooker point. (blue to neutral and G/Y to earth)

telectrix · Nov 21, 2018

i should have said, dependent on the ccc of whatever cable is there.

littlespark · Nov 21, 2018

It would probably be ok, Tel.... as the 3 core flex did supply the old hob, but we don't know without seeing it in the flesh.

Wiring for New Electric Hob - 4 wires

John White

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buzzlightyear

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John White

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John White

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buzzlightyear

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Wilko

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littlespark

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John White

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MDJ

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littlespark

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John White

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telectrix

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littlespark

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telectrix

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littlespark

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