thermal effects for cooker cables

[tornadoarnold]

hi everyone, got a quick question about thermal effect/ambient temp factors for cooker cables.

i have been doing some work to a friend of the families house as a favour and to get some experience at house bashing and was asked to wire in the guys new combi oven. he had already had the kitchen tiled before i got there and was quite insistant that he didn't want tiles taking off so i could chop the wall out . so i told him i could change the switch and put it on legth of cable that runs in free air down the back of the oven instead.

the cooker only drew a max of 17.5A, and i worked out i could use 2.5mm cable and it would allow a ambient temp on the cable of something like 60degrees.

just wanted to know if you guys think allowing for 60 degrees is high enough or is it worth upping the cable to 4mm

 

[Notsosmart]

What is the circuit protection, the cable needs to be rated at more than the breaker.

 

[SirKit Breaker]

I normally shove 4 or 6mm cable in for cookers, just in case someone at a later date goes and buys some great big electric eating monstrosity, bang in a breaker to suit depending on rating of the cooker. 16a usually does the trick.

 

[tornadoarnold]

cheers guys,

i put it on a 20A