Hob Wiring

[Ninanina]

I don't know if there are any electricians on here but thought I'd post this as it's totally flummoxed me...

I have purchased a new induction cooker hob to replace my previous hob which was tripping the house rcd's and it was about time I had a new one anyway

However I just don't understand how to wire it up... behind my cooker I have a 30a junction with the standard Live, Neutral and Earth feeds... the recommended cable to come from the 30a junction to the hob is a cable called: H05V2V2-F.... I have purchased a length of this cable but it has 4 x wires coloured: Brown, Black, Grey and Yellow/Green

Apparently you have to use the H05V2V2-F cable or the warranty of the hob is voided, something to do with fire retardancy

Can anyone help how I wire in the 4 x wires into the 3 x junction

Also the hob end connections are: 1, 2, 3, N (Neutral) and Earth so again how on earth can you make 4 x wires fit the 5 x connections?

Thanks for any help :doh:

[struth]

I would think you should be using the 3 core version for operation on 220-240V~: use an H05V2V2-F type three-core
cable (3 x 2.5 mm2).

[CageyH]

The make and model of the hob may help for someone to advise.

[Stratmangler]

If you don't know what you're doing get an electrician in to connect it up.
I found this with the cable type number you listed, and it's a massive fire risk if you use the wrong diameter cable http://www.doncastercables.com/cables/4/5/Flexibles/Heat-Resisting-PVC-Insulated-and-Sheathed-Flexible-Cords-90--C---Ordinary-Duty/

[Ninanina]

The hob is an AEG HK654200FB if that helps

It is rated at 7.4 kW

[struth]

4 and 5 core is for using on 3 phase. which it wont be if you are in a house ie 380/415 volts 2.5mm is 24 amp cable

[CageyH]

From the manual http://www.electrolux-ui.com//DocumentDownLoad.aspx?DocURL=2015\867\311502umEN.p df:


Use the correct mains cable of type H05BB-F Tmax 90°C (or higher) for a single phase or
two phase connection.

It sounds like you bought a two phase cable by mistake.

[Ninanina]

From the manual http://www.electrolux-ui.com//DocumentDownLoad.aspx?DocURL=2015\867\311502umEN.p df:



It sounds like you bought a two phase cable by mistake.

Hi Kevin the cable I have was purchased from AEG direct and it would seem that the HO5BB-F Tmax cable is just not available anywhere

I also think that the cable AEG supplied is for 2 phase....

[CageyH]

Do you have any copper links?

Does this help?

http://www.diynot.com/diy/threads/aeg-induction-hob-wiring.68347/

If you have any doubts, you need to get a qualified electrician to do this....

[struth]

if they say its the right cable then it must be continental 2 phase or something like that. but the spec of the hob is 30 amps usage which is so close to your breaker limits it will likely blow again. they must be using double into single to work it I imagine.

[struth]

Just read that link from Cagey. looks to solve it. they are using 2 split power lines into the hob and connecting both power +'s together at the wall. Very odd dual phase; dunno what country uses it. It still doesnt change the current draw is over 30 amps from the hob at 7.4 kw being divided b 235 volts will give 31 amps or thereabouts. if you breaker is a 30 amp then it will likely trip out a lot. My cooker outlet is rated 45 amps and only has a 45 amp fuse for it. Dont know what the max regs are now so this may be an issue in using this particular hob.

[CageyH]

My induction hob runs off at least a 40amp fuse, so I don't think it's going to be happy on a 30amp breaker!

[struth]

I'm gas so that line gets used for powering the shed via armoured cable

[Ninanina]

My induction hob runs off at least a 40amp fuse, so I don't think it's going to be happy on a 30amp breaker!

That's a bit worrying.... my breakers look like this:
http://s7.postimg.org/688jqpfiv/IMG_0784.jpg (http://postimg.org/image/688jqpfiv/)

It's the one on the right that is tripping with my current hob...but only when using one of the rings

[struth]

its a 32 amp... it might be tired and thats why its tripping or the ring could have a fault; or a bit of both but it is a tad too close for comfort. much will depent on the rating of the house wiring as to whether that can be increased bu an electrician would need to test

[Ninanina]

its a 32 amp... it might be tired and thats why its tripping or the ring could have a fault; or a bit of both but it is a tad too close for comfort. much will depent on the rating of the house wiring as to whether that can be increased bu an electrician would need to test

The wiring in the house, including all the junction boxes etc, are only a couple of years old. It is only one ring that is tripping the RCD, all others are fine.. I was going to repair the one faulty ring but the whole cooker is a bit past it so went the induction route instead and getting rid of the oven as I only use my combination, and where the cooker was I'm going to put in a freezer instead. The freezer will not be using the 30a junction box only the induction hob..

[struth]

It kinda depends if the figures are for the whole thing when all are on or if its for each ring. if its the former then it should be fine as long as you dont use all the rings and oven/grill at same time I would think. I dont like the sound of using 2 wires into 1 but I guess it must be legal if they are selling it. The house wiring may only be rated at that and wired with standard twin & earth. Cooker supplies are/ were usually run with a much thicker conductor and hande 45 amps, in my day. Mine is an old house. A case of suck it and see...if in doubt get a pro in to do it and play safe with your insurance etc(not to mention your life);)

[Oddball]

Good luck with the wiring Ninanina !!
I would concur about the sparky!!:)

Although I think Ali Tait would be the man for the job considering his avatar:eyebrows:

[Ali Tait]

:D

[Ninanina]

I've decided to get a better and bigger cable

The AEG recommended cable was 4 core, which is wrong to begin with, as that's for 2 phase and each conductor is only 2.5mm2

I have gone with a H07 RN-F cable of 4mm2 per conductor and a proper 3 core for single phase

I read lots before deciding what to go with.. I also read about one of AEG's full cookers, which is rated at over 12kw, and the recommended cable for that was the H07 RN-F so if it's good enough for >12kw I thought for my hob, rated at 7.4kw, it is over the top so must be ok ;)

I worked out that the 2.5mm2 cable suggested by AEG for my hob was ok for the hob but only using the 'Diversity Factor', which kind of suggests that you won't have all the hob rings on at the same time etc etc.... however if I did have all the rings on at the same time the recommended 2.5mm2 cable just isn't big enough

So 4mm2 cable is what I went for and it's much bigger and still has a heat retardancy of 85 deg C

My breaker at 32amps also seems to be fairly standard and up to the job. I calculated that at full power on all rings the amps would never go beyond 31.62 amps so all seems ok there

It's amazing what you learn in a very short time when needs must ;)

I could, of course, just got a sparky in to install the hob but I believe most of them would just of fitted a beefy twin & earth cable which would have invalidated the warranty due to not having the correct heat retardant rating.... well that's what I've read anyhow... and I like to do things for myself :doh:

[Firebottle]

Good result Bev, plus a bit more accumulated knowledge :)

[Ninanina]

Good result Bev, plus a bit more accumulated knowledge :)

Exactly Alan

Why pay for a sparky when I can do it myself and keep the warranty current as well :D

[Audio Advent]

I've recently fiddled around with cooker/oven wiring (the cooker was tripping out the RCD but was fixed after clearing away some spider webs from the element terminals inside the oven, strung to earth... think the RCD is very sensitive) and the switch and junction box is all 45A rated - I think that is standard isn't it? Depends on the rest of the wiring I guess to determine what the RCD rating should be.