Cooker circuit

[Morty]

Alright guys, I did a kitchen where they asked for a cooker supply to which I intstalled for them. But when I went back for the 2nd fix the cooker they had bought was only a small one which came with it's own kind of kettle lead that you plug straight into the back of it.

So with the 6mm tail coming from the isolator I just put a socket on it and wired the lead into a 3 pin plug and plugged it straight in. But the customer questioned it because he came across a note in the manual that said: Uk and Australia only - Do not use 13 amp socket to wire in cooker.

The cooker was rated at 3250kW and the isolator was fed from a 32A fuse, so once diversity is applied it comes in at less than 13 amps. I can't see the problem with it so I just assured him it would be ok.

What do you guy's think about it?

 

[Spudnik]

Sounds ok to me.

You could always hard wire the cooker and swap out the 32 for a 16 MCB.

 

[Mac]

Alright guys, I did a kitchen where they asked for a cooker supply to which I intstalled for them. But when I went back for the 2nd fix the cooker they had bought was only a small one which came with it's own kind of kettle lead that you plug straight into the back of it.

So with the 6mm tail coming from the isolator I just put a socket on it and wired the lead into a 3 pin plug and plugged it straight in. But the customer questioned it because he came across a note in the manual that said: Uk and Australia only - Do not use 13 amp socket to wire in cooker.

The cooker was rated at 3250kW and the isolator was fed from a 32A fuse, so once diversity is applied it comes in at less than 13 amps. I can't see the problem with it so I just assured him it would be ok.

What do you guy's think about it?

Can't see a problem mate.The maximum draw on it would be under 15A.May need to change the breaker thou to 16A or 20A.

 

[Morty]

I knew that was an option but it was fed from a BS 3036 fuse and i had no fuse wire or carriers of the like so plug and socket was my desired choice. I knew what I did was fine to my mind but I didn't know why the manual would say that. Plus I didn't like the way the customer looked at me as if I was blagging him!

 

[Darkwood]

I dont thnk you should be applying diversity when choosing cable size etc as its possible for the end user to use all the hobs and oven together and if this happens then the flex and plug maybe underated in england, diversity is more for estimating demand not cable calc's

 

[Morty]

I dont thnk you should be applying diversity when choosing cable size etc as its possible for the end user to use all the hobs and oven together and if this happens then the flex and plug maybe underated in england, diversity is more for estimating demand not cable calc's

Fair comment, but i've assured the customer it will be okay now so if it blows then I will just go back and hard wire it in and down rate the fuse.. quite obviously for free. But it's very unlikely that the cooker will be on complete full wack, I don't think anyone ever needs to do that and plus the worst that could happen is that it will blow the 13A fuse so it's certainly not un-safe.

 

[scotsparky]

I dont thnk you should be applying diversity when choosing cable size etc as its possible for the end user to use all the hobs and oven together and if this happens then the flex and plug maybe underated in england, diversity is more for estimating demand not cable calc's

you do use diversity before working out the cable size have a read at the Electrical design guide. If you didnt apply diversity then you could get some huge cables about.

as long as Ib>In> Iz is covered then your nearly there.

 

[KFORDHUNTER]

The easiest option is to swap the cooker switch for a fcu, then connect the oven into a flex outlet plate, if the fuse blows you don't have to get the cooker out to replace it.

No mention of RCD protection, which i presume is an oversight on your explanation and not an oversight on the job itself.

 

[Darkwood]

you do use diversity before working out the cable size have a read at the Electrical design guide. If you didnt apply diversity then you could get some huge cables about.

as long as Ib>In> Iz is covered then your nearly there.

I agree i do use it all the time but was just relating to the single circuit in the above question and over the years ive found some families do regulary use all points of a cooker at once as ive rectified problems before, diversity gives more noticable cable reduction when used on supply cables to dist' boards etc where it feeds numerous circuits.
I will happily stand corrected though as im in industry and i have to give a value to diversity first before using it as i build machinery lines in the industrial scene so may have lost track regarding the above.

 

[saveloy]

I knew that was an option but it was fed from a BS 3036 fuse and i had no fuse wire or carriers of the like so plug and socket was my desired choice. I knew what I did was fine to my mind but I didn't know why the manual would say that. Plus I didn't like the way the customer looked at me as if I was blagging him!

Could it have been the manufacturers clumsy way of saying not to connect the cooker to a ring circuit. Ie any cooker over 2kw has to be on its own dedicated circuit. Just a thought.

 

[Morty]

Could it have been the manufacturers clumsy way of saying not to connect the cooker to a ring circuit. Ie any cooker over 2kw has to be on its own dedicated circuit. Just a thought.

Yes I did wonder that also, which is what I said the manual was trying to get at to the customer in actual fact. Cheers for the feedback lads... I'l let you know if I go back with my tail between my legs!

 

[Mark_Burgess]

It sounds like if you do go back, it will only be on christmas day, just before you sit for lunch!!!