Changing hob from gas to electric

[Glyn1959]

Currently I have a gas hob and want to change to electric.
The electric oven is hard wired (6mm & 32A mcb) and a dedicated cooker switch.
Can I run 6mm cable from existing switch to the hob
or
should I replace with double cooker switch
or
do I need a dedicated cable and bcc separate from the oven?
Advice appreciated. Thx

 

[flameport]

You can connect to the existing switch.

 

[blup]

6mm is plenty for hob and oven

 

[securespark]

Historically, 6mm² has been used for cooker circuits because back when cable was imperial, the size used was 7/0.036" and when cable sizes went metric, the nearest was 6mm².

Also, back then, BS3036 rewireable fuses were very common, & had a higher fusing factor. Because of this, a 0.725 correction factor had to be applied in the current-carrying capacity calc.

Taking this into account meant that 4 milli was too small to carry a 30A load on a rewireable, so 6 milli became the default and it stuck.

In a similar vein, it was later (15th Edition) discovered that 2.5/1.0 T&E was undersized where protected by BS3036, so to rectify this, the circuit was either downgraded by replacing the fuse with a 20A BS3036 or a 30A BS3871 MCB.

By January 1985, it was mandatory to use 2.5/1.5 cable.