AEG ceramic hob wiring.

[Kenny29376]

Hi I have an AEG ceramic hob and it is 6.4kw nominal power can I use H05v2v2 ff heat resistant cable.

 

[Midwest]

I assume we are talking of the final connection, between the properties fixed wiring and the appliance?

Yes you can use heat resistant flex, but not necessarily just heat resistant. Any suitable sized cable may suffice.

What does the manufacturer instructions say?

 

[Kenny29376]

I assume we are talking of the final connection, between the properties fixed wiring and the appliance?

Yes you can use heat resistant flex, but not necessarily just heat resistant. Any suitable sized cable may suffice.

What does the manufacturer instructions say?

Hi it says to use H05BB-F or H03V2V2-F that withstands up to 70 degrees.

 

[Midwest]

Hi it says to use H05BB-F or H03V2V2-F that withstands up to 70 degrees.

Does it recommend a cable size?

 

[Kenny29376]

Does it recommend a cable size?

It doesn't give a size but the cable I have is 10mm outside diameter think it 2.5mm

 

[Taylortwocities]

Standard PVC twin&earth is rated at 70degs C.
[automerge]1585496237[/automerge]
6.4KW = 27A. That is the absolute max for 2.5mm cable. I’d be looking for 4 or 6mm.
how big is the MCB for the circuit?

 

[Kenny29376]

Standard PVC twin&earth is rated at 70degs C.
[automerge]1585496237[/automerge]
6.4KW = 27A. That is the absolute max for 2.5mm cable. I’d be looking for 4 or 6mm.
how big is the MCB for the circuit?

32amp for hob only

 

[Midwest]

Standard PVC twin&earth is rated at 70degs C.
[automerge]1585496237[/automerge]
6.4KW = 27A. That is the absolute max for 2.5mm cable. I’d be looking for 4 or 6mm.
how big is the MCB for the circuit?

what about applying some diversity. Bit of 2.5mm flex would be okay.

 

[Taylortwocities]

The hob is unlikely to pull the full 6.4KW. But I would still want to see a bigger cable than 2.5mm in there.

 

[Midwest]

The hob is unlikely to pull the full 6.4KW. But I would still want to see a bigger cable than 2.5mm in there.

Haven’t my old BYB on me, but TLC direct says 2.5mm butyl flex is good for 25A.

 

[Kenny29376]

Thanks for all the advice will double check cable specs and measure it.

 

[pc1966]

If you are talking about a short length from a cooker outlet to the hob then Toolstation sell short lengths of 6mm T&E that avoids a lot of unused wire being bought, for example 3m coil here:

Doncaster Cables Twin & Earth Cable (6242Y) Grey

This strong but flexible twin and earth cable is perfect for light industrial or domestic wiring jobs. It’s so easy to work with – easy to install, strip and terminate.Supplied in a 3m coil, it’s perfect for smaller jobs – the 6242Y cable can be installed in conduit, trunking or ducting...

www.toolstation.com

Otherwise if you really want to use round cable then you can buy the HO7RNF style of cable by the meter from CEF or Superlec. I would suggest at least 4mm for a 32A circuit, for example:

4mm² 3 Core HO7RNF Rubber Flexible Cable (Cut Length Sold By The Mtr)

Designed for flexibility, capacity to withstand weather, oils/greases, mechanical/thermal stresses

www.cef.co.uk

 

[Midwest]

I used to buy my short lengths of flex from my wholesalers or Screwfix. If they are open for trade at this time.

 

[Midwest]

I did have a chuckle to myself; we’ve had loads of threads on this subject.

OP’s are always told about fixed loads on radial cooker circuits, diversity etc. As been calculated, this hob would have a maximum load of 27A, less with diversity & cycling of each cooking zone.

IMO 2.5mm flexible cable will be fine, OP could probably get away with 1.5mm. He might also have difficulty terminating 6mm cable in the appliances termination box. And before anybody says anything, bootlace ferrules should be used with flexible cables in this scenario.

 

[pc1966]

Agreed that 6mm is overkill, only suggested it as you can buy it in short coils for jobs like that. I doubt most DIY folk would find much use for the 98m or so left over from buying a reel of 4mm T&E!

In the old days you could simply but whatever type of cable you needed by the meter, even from Woolworth in the 70s and 80s! At least for some like HO7RNF that is still the case for mail order.

Also have an up-vote for suggesting bootlace ferrules, again a professional touch and a significant advantage for screw fixing fine stranded wires, but very unlikely to be seen by DIY folk.

What worries me about fitting cable that is sized for the appliance & diversity assumptions (and not for the OCPD) is what happens down the line if it simply gets reused on a new appliance. We all know it should be checked and upgraded if necessary, but how many folk outside of professional sparks or the most diligent of DIYers ever does?

Recently a mate of mine was saying his new cooker kept tripping the breaker so they had a bigger one fitted. I suspect I visibly winced when he said that as my first thought was "did anyone check what the cables were rated at?" but I know I am in a minority.