Cooker Diversity

[peterduckett]

I have a cooker install currently protected buy a 30amp rewire-able fuse, The max rating of the cooker is 5.5kw

To me this does not seem quite right!

Yes i know 5500/230 = 23.9 amps but if you apply cooker diversity
10 + 30% of remainder (4.1) = 14amp +- 5 for extra plug socket

But what do you people think is it better to use Diversity on a cooker circuit or not?

EDIT(Ok should say Oven)

 

[Steve]

5.5kw sounds like an oven or a hob.

If it is an oven, do not use diversity, as full load could be pulled for a while.

I would only install an oven on its own circuit. No socket.

The diversity rules for cooker circuits, IMO are too generous. A 40A appliance should be on a 40A circuit.

Cooker control units with sockets should be outlawed.

 

[Taylortwocities]

In the real world it is necessary to use diversity.
Otherwise you'll have a consumer unit full up with 40amp CBs and need a 600amp supply to each house!

Just add up the values of the CPDs at your house. Do they come to more than the suppy fuse value?

 

[Steve]

In the real world it is necessary to use diversity.
Otherwise you'll have a consumer unit full up with 40amp CBs and need a 600amp supply to each house!

Just add up the values of the CPDs at your house. Do they come to more than the suppy fuse value?

Yes, but I was talking about cooker diversity. I'm not suggesting we have 260A ring finals because I have 20 sockets!

 

[peterduckett]

As i put in my edit i ment to put oven though i didn't think i mattered as i though Cooker was a general term.

According to the book their should be a 20 amp double pole switch installed for oven and 45amp for oven +hob BTW i have non

That would suggest 20amp fuse would have been ok but i just wanted some opinions

 

[PrenticeBoyofDerry]

I'd try to steer away from using diversity on a cooker circuit and give it as much current as allowable.
Of course if you are trying to make the sums work for your maxmium demand, fair play, it's a tool that can be used.

 

[Taylortwocities]

Yes, but I was talking about cooker diversity. I'm not suggesting we have 260A ring finals because I have 20 sockets!

My comment was to Peter's OP. You have faster fingers than me and got your post in while I got too wordy, again!

 

[peterduckett]

Of course if you are trying to make the sums work for your maxmium demand, fair play, it's a tool that can be used.

It not a case of that I'm curious to the use of a 30 amp fuse and if this was correct. Im no spark but understand more than the general Joe Bloggs

 

[EdwardCurrent]

Hello.
As PBT says d&d can be 'used' I agree, but I wouldn't want my precious 2 hrs in the pub on X- mas day ruined by customers calling me to telling me the "electrics gone" for the sake of using a larger cable/mcb than I should have in the first place.
Only my humblest of opinions.
Ed

 

[davelx]

Remember that the purpose of the fuse is to protect the installed cable, NOT the appliance. Providing the cable between the cooker and the connection unit is also rated >=30A as installed then the installation is safe. You don't need to reduce the fuse rating just because cooker does not need the full 30A.

 

[mikhailfaradayski]

wheres coljack?

Diversity can be applied, its down to the designer of the circuit to assess the level of diversity appropriate. The 10A+30% jobby is a decent guidline to work with, but not an absolute rule.

There is a suggestion that a 32A circuit is usually sufficient to supply cooking appliances upto 15kW.