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3 Phase Cooker
by KenT • Fri 01 Aug 2008 16:50

I have three phase power connected to my house. Having the cooker on with multiple rings trips the power. On investigation I have found that the cooker is only wired to one phase although it has the capability of being connected into three phase. I assume there would be no problem in getting it connected to a three phase socket. Can anyone confirm this please.

KenT
New Member
1
Aug 2008
Re: 3 Phase Cooker
by smilespwp • Fri 01 Aug 2008 18:11

Ken

Bit reluctant to give any advice on electrical systems, especially in France, where, judging by our place there have been plenty of botched jobs (Just found a live wire protruding from the wall in our first floor utility area. Still trying to trace where it's fed from). And removed some old and redundant three phase wiring for a storage radiator system that was installed at one time or another. We're now on a single phase system but still tidying up some of the previous occupiers efforts.

You don't say what make of cooker you've got but if it's an AGA then this link may be useful.

Problem with electricity, is that its not very forgiving. If in doubt leave it to an expert. But if you have a three phase supply and it is possible to run the cooker off a three phase supply then it shouldn't be too much of a problem getting an electrician to install a three phase socket.

Best regards

Brian
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smilespwp
315
Apr 2007
Re: 3 Phase Cooker
by tomdenne • Sun 03 Aug 2008 01:22

Why bother with three phases at all unless you have some machine that specifically needs it? Look at previous posts in this group.

To summarise: three phases = 400 volts in France = dangerous. EDF will change you to monophase & install a new meter FOC (at least they did so for me). Your monthly abonnement is nearly 44% more expensive with three phase. OK, this amounted to about only 50€ extra pa for us, but, as they say, every little helps.

Cheers, Tom

tomdenne
133
Jan 2008
Re: 3 Phase Cooker
by Annik • Sun 03 Aug 2008 10:26

We had three phase for years but had it changed for free when we realised that this could be done. It was very easy and we got a posh state of the art meter which can be read from outside - very handy for the meter reader when you are not at home. It is a very useful one because it provides you with all sorts of information. You are even alleged to be able to telephone it and find out this information (though we never have).

Annik

"Outside of a dog, a book is man's best friend. (Inside of a dog, it's too dark to read.)" Groucho Marx
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Annik
1246
Jun 2007
Re: 3 Phase Cooker
by RobertArthur • Sun 30 Oct 2011 22:47

Noticing elsewhere that cookers are still a hot topic, especially for those having a three-phase installation, some thoughts about connecting these cookers.

Let's take a run-of-the-mill diagram, this one is a Dutch Siemens cooker. Equipment side of the wiring in these pctures: left. Exactly the same diagram you'll see in multi language NEFF documentation for the international market. Wire colours, equipment side: 1. brown; 2. black; 3. blue; 4. white; 5. yellow/green. Installation side: one and two for phase L1 and L2. Or L1 + L3, or L2 + L3. You should find L3 in grey there, but please don't trust anything in a three-phase installation. You never know who did what in the past.

In the Netherlands - picture at the right - this type of equipment has to be connected in a three-phase installation, using the special Perilex power plug. But with only two of the three phase wires and two separate neutral wires as illustrated in the diagram. With 16 amps as the maximum for a fuse or MCB - Dutch electrical code NEN 1010 - there are two of them in this almost three-phase connection. For practical purposes to be considered as two times single-phase, not as a "real" three-phase Y or Delta configuration (US voltages of 120 volts in this educational effort). With two times 16 amps the Dutch have the same amount of power as the French for their plaque de cuisson in single-phase: 32 amps.

Let's go to France, triphasé, picture in the middle. This is also a " two-phase" model, and you need a disjoncteur tétrapolaire in your consumer unit of 20 amps (each phase). And a RCD (interrupteur différentiel tétrapolaire) of course. Have a look at this diagram how to do it. Where they show a cooker that needs all the three phases, and neutral of course.

The first picture is a monophasé connection. To conclude: one MCB of 32 amps and 6mm² wiring in single phase, and one disjoncteur tétrapolaire of 20 amps and 2,5 mm² wiring in three-phase. And of course 30 mA RCD's for your personal safety.

And to repeat a familiar message: only if you were to have special three-phase equipment, electric motors, airco equipment etc., you need it. If not: better change to single-phase. Crucial question: your abonnement in kVA. With for instance 12 kVA in three-phase you have three times 20 amps coming in. Not very difficult to overload one of them with such a power-hungry piece of kitchen equipment. Balancing the phases, since the start of this website and forum discussed more than once.

And don't forget that since the revision last year of the electrical code by the name of NFC 14-100 the maximum power you'll get from ERDF in single-phase is 12 kVA. More power: three-phase. And sometimes your local powergrid is a bit underpowered, and ERDF will say after a feasibility study: sorry, conversion from tri to mono not possible, too much voltage drop due to the higher currents in monophasé. Buying an electric cooker is one thing, but the raccordement in your French installation électrique is something else. To make life easier for those with only a low-power abonnement (6 kVA mono), some producers are marketing cooktops you can connect in single-phase, puissance de raccordement 4600 W (MCB 20 amps and 2,5mm² wiring).

But be careful, before doing anything take a multimeter to be 100% sure that the colours used conform to the regulations. Phase 1, 2, and 3 should be brown, black and grey, and blue for neutral. But sometimes electricians use what ever they've got available to finish the job. Leaving you with dangerous voltages in colours you thought were safe. Remember: it's 400 Volts between the three phase wires L1, L2 and L3, deadly. If you have no prior experience with l'installation électrique: please don't do it. Ask somebody else, don't take any risk. In most manuals of manufacturers for this equipment in France you'll find instructions for connection in single-phase or three-phase, sometimes also on the back of the cooker or hob.

Going to the French electrical code, NFC 15-100. They like the so called circuits specialisés here: nothing else to be connected except appliance x, y, or z. A cooker, a plaque de cuisson is such a circuit specialisé. A separate four indépendant is also such a circuit specialisé: MCB of max 20 amps and 2,5mm² wiring (monophasé).

Robert

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RobertArthur
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Mar 2009
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