Induction hob on two phase.

[Engineer54]

I am not trying to isolate both from one isolator, I have two isolators, one each for the hob and oven, I want to isolate the two phase hob from one switch, the three phase's are controlled from the fuse box from a three combined 20amp (20amp/phase) cartridge breaker the wires are single sheathed in a conduit that runs to a three phase socket near the hob, I have plugged into this with the correct three phase plug and run this to an isolation switch on on to a cable outlet, thence onto the hob in heat proof 6mm cable, my problem prior to Lenny pointing it out was that I did not know there was a three pole switch available.

Now I just have to find a three pole cable outlet and 6mm four core cable.

Mike

Ah, cartridge fuses, not exactly the best arrangement when protecting multi phase circuits....

So what your saying is, you have an isolation switch already for the oven, your just referring to the hob's means of isolation. So yes, a 3 pole switch would work, but then so would a DP switch, by making safe the unused phase (even removing fuse at th DB) and switching just the 2 phases at the DP switch. A DP switch is going to look far less industrial than a triple pole switch in the kitchen. Then you would only need a 2 pole socket outlet and 3 core cable. Do the French use a specific outlet and plug top for 2 phase +E ?? You may find that they do! It'll have to be a big-un to connect 6mm 3 core cable in the plug tops ....But it's your choice!! I really think it might be a good idea to have a talk with the local electrician!!

Personally, i would seriously think about getting your local electrician to upgrade your DB to a MCB distribution board too. At least then, if fault on one phase of a multi phase breaker appears the whole breaker trips not just one of the breakers, which is very bad news for any multi phase motors you may have.

 

[Mike Johnson]

Please read my post carfully there is not an unused phase, yes the French use a specific outlet and plug for a three phase kitchen connection and yes it is big and I know that they do, a DP switch would not work as it will not isolate the neutral, the main board is already an MCB.

Thank you for your contribution I now have enough information to be able to change my hob connection to a switched 3P isolator.

Mike

 

[Engineer54]

Am i loosing the plot here or what??

You say you have a 2 phase+E hob fed from a 3 phase + N/E (5 conductors) socket outlet. So why on gods earth are you switching the neutral when it's not required?? Oh, and a 3 pole switch will also not switch the neutral either, you need a 4 pole switch to do that!!!! So, what's the other phase and the neutral at this socket outlet going to be doing then??

In my world, when someone states ''Fuse Board'' and ''Cartridge'' that would imply cartridge HRC fuse carriers. If you have MCBs, RCD'S etc then it's a Distribution Board, or Consumer Unit, ...Not a Fuse board!

I'm pretty sure you don't really know what your doing to be honest, your playing around with 3 phase stuff that you don't understand. So i'll tell you again, for your own sake and your families sake, ...get your local French electrician in to do this work for you!!!

 

[Mike Johnson]

I am switching the N because its required under the French Regulations.

Two phase and neutral to the hob switched for isolation, three poles switch will work, only three leads, E passes straight through.

Other phase and neutral connected to oven through a seperate isolator.

Sorry for the incorrect teminoligy I will throw myself on my sword the next time I get it out to clean it.

Mike

 

[Engineer54]

You really do need to make your mind up about this hob, You have clearly stated this hob to be 2 phase + E, now your saying it's 2 phase + N + E???

You have told us you have 2 supplies one for the hob and one for the oven, Now your talking about both being supplied from this single point 3 phase socket outlet????

Yes your terminology, will get you into a lot of trouble, especially when you don't really know what the hell your doing playing around with 3 phase stuff in a kitchen...

 

[Mike Johnson]

Read the first post it clearly states oven on third phase, you have made a lot of assumptions without reading the posts.

I hope you don't break anything when you fall off your high horse.

Mike

 

[Engineer54]

And i hope you don't KILL yourself or any of your family, with your DIY electrics, that you clearly have no understanding of!!!

 

[Mike Johnson]

Thank you for your concern, I will be sure to post on here if I die so you can have the last word.

Regards
Mike

 

[Engineer54]

Trying to be clever, don't wash!!! The same as THINKING that you know what you doing but DON'T!!

Your just another DIYer that's playing around with something you DON'T understand. Well 3 phase stuff has a habit of not taking prisoners when you get it wrong, so get a professional in that DOES know what he's doing!!

Your a typical DIYer, spend literary hundreds if not thousands on top of the range appliances, but doesn't want to spend anything on installing them correctly and safely. That's all done on a shoestring and a wish...

 

[Mike Johnson]

Why do you think I came on this forum in the first place? to get advice, hopfully without having some condecending electrician treating me with contempt.

Again another assumption on your part about my background, belive it or not some people have an understanding of things if its explained correctly, even when the person giving the explanation belive their subject matter is beyond a normal persons comprehention.

And you are a typical premadona electrician.

Mike

 

[Engineer54]

Listen blockhead, there are plenty of domestic electricians out there, that doesn't understand 3 phase and therefore will not work on 3 phase installations, and for GOOD reason!! However you seem to THINK that you do, after gaining a snippet of advise on a forum!!!! What do they say ...A little knowledge is more dangerous than none!!


I'm actually a Qualified Engineer and one that's been around a bit, ...but if being a premadona electrician suit's your description of someone trying to advise you to get professional help in, that's fine with me!!!

 

[Mike Johnson]

Just an update, nothing has blown up and the installation is balanced and passed it's statutory inspection in July 2012, so been in use for a few years without problems.

 

[Taylortwocities]

Thanks, We can sleep at night now!

 

[DPG]

Just an update, nothing has blown up and the installation is balanced and passed it's statutory inspection in July 2012, so been in use for a few years without problems.

Well done.

I miss Eng54.

 

[Midwest]

Ouch. That wouldn't of passsed the recent changes in prerequisites for members conduct and forum mantra.