DUAL APPLIANCE OUTLET PLATE

Ira Jag · Mar 19, 2021

telectrix said:
not to worry. as i said, both oven and hob will be fine on a 32A MCB, 6.0mm cable (if cable is not smothered in insulation) . this application of diversity has been in use for 60+ years and found to be compliant. only reason to install separate circuits for oven and hob would be to isolate either if faulty and still have use of the other.

(if cable is not smothered in insulation) - we have vaulted ceilings so cables runs between roof and 100mm celotex and in the walls between terminal bricks and plasterboards without conduits. Roof can get hot in the summer, but there is a air gap between roof and celotex to prevent condensation.

telectrix · Mar 19, 2021

cables warm up in use. this is normal. as long as the heat can dissipate, there's no problem. covering cables in insulation reduces their current capacity, the derating factor dependent on how thick the insulation over the cables is.e.g. 6mm cable with no insulation is rated at 47A continuous. derating due to insulation can be as much as 40%. a reasonable air gap around the cable is recommended where cable is heavily loaded.

Ira Jag · Mar 19, 2021

telectrix said:
cables warm up in use. this is normal. as long as the heat can dissipate, there's no problem. covering cables in insulation reduces their current capacity, the derating factor dependent on how thick the insulation over the cables is.e.g. 6mm cable with no insulation is rated at 47A continuous. derating due to insulation can be as much as 40%. a reasonable air gap around the cable is recommended where cable is heavily loaded.

Because of vaulted ceilings our cable runs in air gaps between insulation and roof, I don’t know building regs for air gap in roof but I believe it minimum 50mm or more. Maybe it is not same as no insulation, but there is good air gap.