MCB rating for electric cooker

mahargwa

1. What rating MCB should I use for a standard electric cooker with ceramic hob and 2 ovens (one with fan, one with grill)

2. Should a radial circuit of 2.5mm2 be protected with a 16A or 20A MCB.

M cebee

there's a section on cookers in back of rules -i think it's 10kw total connected load on a 32amp circuit

you need to add up the cooking load and see if you need an extra circuit

for a 16/20amp radial circuit -if you divide the 16/20 by any correction factors that'll give you the current rating needed
http://www.tlc-direct.co.uk/Book/4.3.9.htm

if you're starting with the 2.5 you can prob multiply by correction factors to calculate the mcb size

beanie10

Ovens can normally wired off a fused spur 2.5 20amp clean line from board, check the wattage of oven first. For the hob you should use a 6sq cable from the board to cooker switch protected by a 32amp mcb.
If you are wiring the oven off the hob supply make sure to use proper fused protection on the flex to the oven.
A 2.5 and a 6 sq cable will cover all angels as diversity is taken into account

M cebee

sounds like he might have a single cooking appliance

-if so that'll be one circuit anyhow of the appropriate size

beanie10

Misread that thought he had 2 separate ovens

mahargwa

Its a free standing cooker rated at 10.8 kW so a 40A MCB should be ok. 10.8kW is 45A at 240 Volts - (The rating of the cooker was 240V as it's quite old) So a 40 A MCB should be ok as all of the plates and ovens won't be ON at the same time. The cable is ok 6mm2 I think and near to the consumer unit. Thanks for the advice.

Bruthal

I think a 32amp breaker will do you for that. And best if its a 6 square cable.

M cebee

it's prob only 10kw at 230v -same as the showers

http://www.tlc-direct.co.uk/Book/6.2.1.htm

32 amp breaker

short run prob 6sq

the rules says 10kw total anyhow last time i looked

Bruthal

Yea 9.9kw it would be.