Grid Switches :: Spur

[DaveyD]

Hi
Installing a grid switch off the ring final circuit - supplying: fridge, dishwasher, gas hob ignition and cooker hood. I was thinking of spuring off the ring into a fuse grid module and then into each switch of the grid? Would you do this?

Thanks in advance.

Regards, David

 

[chiplard]

In a word, No.

The load you have at the minute might be within the limit of the cable ( between the ring and grid ) but what happens if someone later decides to swap the kitchen round and have a dishwasher, tumble dryer and washing machine running off the grid. In theory you have 4 points being supplied of which 3 could quite easily have a 13A appliance running off them

The Fuse/MCB isn't going to protect the spur before it starts to get very warm!

 

[DaveyD]

Thank you for your comment. It's a gallery kitchen so you could not get anything else in. The washing machine is traditionally in the utility if a house has one. The freezer is there too.
Due to restrictions on the work surface (distance to sink) I'm very limited.

What if I dispence with the fuse and loop the supply of each isolator in the ring final circuit and then down to each appliance plug top?

Regards, David

 

[chiplard]

That would be a better idea, that way you are sharing the load across the rfc.

Don't forget that an under counter appliance must have an accessible means of isolation.

 

[DaveyD]

That would be a better idea, that way you are sharing the load across the rfc.

Don't forget that an under counter appliance must have an accessible means of isolation.

Thank you CL. The isolation will be the grid switch and the intergrated appliances will be on plug tops behind appliances.

Kind Regards, David

 

[Deleted member 26818]

You would not normally use a single fuse for multiple switches. The usual practice is to provide each switch with an individual fuse.
Remember, that such a system will probably overload one leg of the ring, unless the grid is placed at the mid point of the ring.
You may want to consider increasing the conductor size for the feed to the grid to compensate.

 

[DaveyD]

Thanks for your reply Spin.

You would not normally use a single fuse for multiple switches. The usual practice is to provide each switch with an individual fuse.

Yes I realise, thank you. It's just the grid would be huge then.

Remember, that such a system will probably overload one leg of the ring, unless the grid is placed at the mid point of the ring.
You may want to consider increasing the conductor size for the feed to the grid to compensate.

So even though this ring final circuit is dedicated for the kitchen and utility are you suggesting that with grid switcheed its better to fit a radial?

 

[Deleted member 26818]

Thanks for your reply Spin. Yes I realise, thank you. It's just the grid would be huge then.

So even though this ring final circuit is dedicated for the kitchen and utility are you suggesting that with grid switcheed its better to fit a radial?

Yes, they can be quite large. However, your initial suggestion would I beleive have entailed using an 8 way grid with 3 blanks. No larger than an 8 way grid with 4 fuses and 4 switches.
I wouldn't necessarilly say a radial is better, just an option that you could consider.

 

[DaveyD]

Thanks again.

Yes, they can be quite large. However, your initial suggestion would I beleive have entailed using an 8 way grid with 3 blanks.

It was a five grid, one fuse and four switches.

 

[Deleted member 26818]

Oh right. I'm used to the ones that are only 4 ways across.
What make are the 5 way grids, and do they fit a normal double back box?

 

[DaveyD]

Oh right. I'm used to the ones that are only 4 ways across.
What make are the 5 way grids, and do they fit a normal double back box?

Thanks for your patience! That's because I'm an idiot and can't count! Sorry mate. So, basically because of the position of the sink, cooker etc on this side (where these appliances are) I have limited space (600mm) so usually I fit switched FCU but thought the grid would work if I keep in the ring (looping between switches) and then each 20a rated switch would isolate the fused plug top appliances. What do you think?

 

[malcolmsanford]

Have you looked at something like this .

Modules at Gil-Lec.co.uk

Look really good

 

[Deleted member 26818]

Yes that should work.
Looking at the list of appliances, there shouldn't be any real overloading of one leg of the ring.