UK Kitchen grid switch help

[ibra123]

Hello everyone, I'd like to seek your input on a matter. I'm in the process of designing the electrical connections for the following kitchen appliances:

Hob
Oven (below 2kW)
Fridge/Freezer
Dishwasher
Washing machine
Extract Hood

For the hob, I intend to connect it to a cooker connection unit (located below the counter) and then to a 45A cooker unit (above the counter) on a dedicated circuit.

As for the remaining appliances, my plan is to wire them to unswitched 13A sockets (positioned below the counter) and then connect them to a 6-Gang grid switch, which will be part of a 32A ring circuit.

Now, I have concerns about the potential load being too high for a single circuit. Is it possible to establish two separate circuits for the grid switch without the need for an ugly warning notice?

Additionally, I've been pondering whether placing all these appliances on a 32A ring circuit might result in the 13A fuse in the appliance plug blowing first in case of an overcurrent issue. This would require users to remove the appliance and replace the fuse. Any thoughts on this matter?

 

[Dustydazzler]

Most appliances come with a melded on plug top which is recommended stays on as part of the warranty. I try not to cut any plug tops off unless I absolutely have to.
For a multi way grid you can take a couple 20amp radials to the grid to spread the load a bit. just make sure everything is labelled at the board and you can even put some stickers on the back of the grid

 

[ibra123]

Most appliances come with a melded on plug top which is recommended stays on as part of the warranty. I try not to cut any plug tops off unless I absolutely have to.
For a multi way grid you can take a couple 20amp radials to the grid to spread the load a bit. just make sure everything is labelled at the board and you can even put some stickers on the back of the grid

I won't be cutting the plug tops, I will be plugging them to 13A unswitched sockets.

As for the gird switch, BS7671 section 537.1.2 states "Where an installation or an item of equipment or enclosure contains live parts connected to more than one supply, a durable warning notice shall be placed in such a position that any person, before gaining access to live parts, will be warned of the need to isolate those parts from the various supplies unless an interlocking arrangement is provided to isolate all the circuits concerned." This tells me that the warning notice needs to go next to the grid switch.

 

[Dustydazzler]

I guess technically yes

But I put a sticker on the backside of the grid cover plate

 

[DPG]

20A isolator above worktop above each socket - can then have get them engraved with appliance type.

Also saves the congestion of a grid switch.

 

[littlespark]

“Congestion”

That’s a great word to describe what a PITA it is to work in them…. Especially one fitted under a wall unit.

 

[nicebutdim]

Additionally, I've been pondering whether placing all these appliances on a 32A ring circuit might result in the 13A fuse in the appliance plug blowing first in case of an overcurrent issue. This would require users to remove the appliance and replace the fuse. Any thoughts on this matter?

What makes you believe appliance fuses would be affected in these circumstances?

Protective devices at db tripping due to overloaded circuit or cumulative earth leakage would be a greater consideration.

It's not a circuit I'd be happy installing, with the possibility of one appliance fault taking everything else out.

 

[ibra123]

20A isolator above worktop above each socket - can then have get them engraved with appliance type.

Also saves the congestion of a grid switch.

The point is to not have sockets visible above the kitchen worktop.

 

[ibra123]

What makes you believe appliance fuses would be affected in these circumstances?

Protective devices at db tripping due to overloaded circuit or cumulative earth leakage would be a greater consideration.

It's not a circuit I'd be happy installing, with the possibility of one appliance fault taking everything else out.

If I am protecting several appliances that have plugs with 13A fuses and a 32A RCBO ring at the DB, wouldn't the 13A fuse blow first if there was an overload due to one of the appliances?

How would you circuit the above listed appliances?

 

[littlespark]

The point is to not have sockets visible above the kitchen worktop.

You wouldn’t.

The sockets are below the counter. The switches are above. Individual switches rather than a bank of 4 on one plate.