Kitchen Appliance circuit

[Snapester]

Designing a kitchen appliance circuit, i plan to feed a bank of grid switches with a 6mm T&E fed via a 32A MCB, then each switch will have a 2.5mm cable to a fcu supplying an under counter appliance.
My main question is, is it ok to change down to 2.5mm and then feeding the FCU? As the cable cannot be overloaded as the main load is connected to the FCU at position?

Regards

 

[Snapester]

It seems a little strange running two ring legs from the CU straight to the grid plate? Surely 1x 6mm will be exactly the same? I fail to see the difference apart from conductor size?

 

[J&M Electrical]

run a ring to a grid switch?

Yes, its 1 switch but the switch is effectively 6/9/12 points or however many Appliances your switching.

 

[Snapester]

I gather the whole idea that the switch supplies x amount of points but why run 2x 2.5mm 20m to the grid whereas 1x 6mm will be more than adequate?

 

[Des 56]

It seems a little strange running two ring legs from the CU straight to the grid plate? Surely 1x 6mm will be exactly the same? I fail to see the difference apart from conductor size?

Do 2 installations,one with a 6,0mm radial supply and another with 2,5mm ring.fit the grids then decide which was the easiest and better quality arrangement

 

[Snapester]

Yes i may do this.

 

[DaveyD]

It seems a little strange running two ring legs from the CU straight to the grid plate? Surely 1x 6mm will be exactly the same? I fail to see the difference apart from conductor size?

Would you even get two 6mm conductors in? If its MK, crabtree or GET I could'nt do it.

 

[Snapester]

Well according to Mk Data sheet 2x6mm is possible! Although i think looping with 4mm will be a better option and just having main feed as 6mm.

 

[Des 56]

You have had many opinions, so all I can now say is, everyone to their own ways, hope it works out for you

I will think of this thread the next time I'm putting those little loops across the grid switches

 

[Snapester]

Could always use a 6mm wago connector in the backbox and loop off with 2.5 to each switch!

 

[DaveyD]

What about in the event of a short circuit at the FCU?

Edit: Or a fault at the FCU that somehow results in 32A and no more being drawn through the 2.5mm cable?

Fire hazard me thinks

OK - I'm not tring to be contentious here - I'm sure you are more experienced than me; but are you saying that my reply is incorrect? I was thinking say for example on a 32a radial in 4mm T&E. You are permitted to spur off to one double socket in just 2.5mm T&E. We are not suggesting that 2.5mm will be ok at 32a.
Happy to be corrected so long as it's constructive.

 

[Snapester]

Ha thanks Des56 i do take onboard everyones opinions and am also very grateful for everyones input.

 

[DaveyD]

Well according to Mk Data sheet 2x6mm is possible! Although i think looping with 4mm will be a better option and just having main feed as 6mm.

Wow, if I had a hat I would doff it to you now Im in near tears working on a 4 way grid in a 2.5mm RFC. What a spoon I am.

 

[Snapester]

Looking at Fig 15B Page.426 in BGB, on a 4mm radial protected by 30/32A OPD you can have an unfused spur run in 2.5mm.

 

[DaveyD]

Looking at Fig 15B Page.426 in BGB, on a 4mm radial protected by 30/32A OPD you can have an unfused spur run in 2.5mm.

Yes, thats what I refering to.

 

[Snapester]

DaveyD just read your other post to which i have just also stated the same opinion as yourself!