electric oven

[mumbley]

hi everyone.

connecting a fan-oven to a cooker radial circuit : 32A MCB in the consumer unit, 6mm cable running to a 45A cooker control switch and then another 6mm cable continuing to a 'cooker outlet plate'.

now i've trawled through a lot of posts to see what cable size to run to the oven itself... the oven is rated at 2.5kW so i would assume a 2.5mm should be sufficient, but i read somewhere that it's better to continue with 6mm...?

 

[Steve]

You need to fuse the supply down to 13A, in order to protect that oven. Best done with an FCU in place of that cooker outlet plate, provided it doesn't feed any other appliances (hob top?)
this is an FCU, by the way

EDIT: and by the way, once the supply is fused down, you can use 1.5mm² heat resistant flex. This would be unsafe if it were only on the 32A breaker - it can only carry 15-20A or so, which is why they say to continue with 6mm²

 

[Adam_151]

EDIT: and by the way, once the supply is fused down, you can use 1.5mm² heat resistant flex. This would be unsafe if it were only on the 32A breaker - it can only carry 15-20A or so, which is why they say to continue with 6mm²

Pendant: not necessaally, its most likely that overload protection is not required because a fixed load is incapable of overloading, which leaves the breaker providing short circuit protection (its no different to a 32A breaker protecting the CPC on a spur off a ring final on a TNC-S system) to check it though you would need the loop impedances, the I²t graphs from the breaker makers and the adiabatic equation

 

[mumbley]

thanks for that, crafty 1289, adam_151...

in the end, i changed the cooker outlet plate for a fcu and ran 2.5mm flex to the cooker.