New oven - with conflicting connection information.

[endecotp]

is there an assumption that both appliances will never be working at full power?

Right. It’s called “diversity”. The elements are controlled by thermostats and cycle on and off; the average load is well below the max.

Note that a 40A circuit can supply substantially more than that, safely, for a while.

 

[icarusbop]

I believe the theory is that that cannot happen, but this is not my “specialist subject”; maybe someone else will comment.

Another poster above mentioned - internal overload protection, but in the same sentence effectively advised it can't be trusted...

, if the appliance has internal overload protection it is not required, but often they don't, so we look at tradition,

 

[icarusbop]

Right. It’s called “diversity”. The elements are controlled by thermostats and cycle on and off; the average load is well below the max.

Note that a 40A circuit can supply substantially more than that, safely, for a while.

This good news for me then (I've never heard of diversity in this area, so thanks for the education) - I already have a cooker connection unit that has two feeds out of it, but was concerned about the capacity of the feed.

 

[morqthana]

But the spec page states "maximum power 3000W" (12.5A @ 240v) - (I wonder if they get the 16A from a 220V supply?? =13.6A)

At 220V it would be a 2.52kW appliance, 11.5A.

The living space has recently all been replastered and re-decorated, plus the CU has no spare ways in it, and there is no space for a new CU, so adding a new feed specifically for this oven is not an option.

Presumably the hob is connected to a cooker outlet behind, or in, a cupboard? Would putting an FCU alongside that be an option?

 

[icarusbop]

Presumably the hob is connected to a cooker outlet behind, or in, a cupboard? Would putting an FCU alongside that be an option?

There is an isolator in the cupboard, I could fit an FCU there and that was one of my plans, but other posters here have advised an FCU is not needed if I connect to the cooker feed.

 

[icarusbop]

Hello All, I did some investigating last night.
There is an isolator and 6mm cable from it pinned to the wall behind the cupboards so access is not an issue.
There is space behind the oven for a Twin appliance connection unit (which I already have), so my current plan is to fit the connection unit behind the oven, feed the cable from the isolator into it, then run both of the appliances from the connection unit:

I did some checks with an online diversity calc, which advised the diversified load would be around 27A
Hopefully this plan is all OK.