I thought a fixed load was an immersion, and shower, a cooker. Any one appliance that has a maximum load.
The cooker and the shower, have a load that can be altered. But are still classed as a fixed load as you can't go over its kW rating?
Am I wrong?
I ask in relation to the BS3036 fuse.
I have always thought that the 0.725 Cf factor applied, to any circuit protected by a BS3036.
But looking at equation 5 in BS7671 the correction factor for the BS 3036 is not used.
As it can not be overloaded, the design current is used in any cable calculations.
But I thought the historical reason why immersions were generally on 2.5mm2 and cookers were 6mm2 cable, was down to the correction factor.
If condition allowed, 1.5mm2 and 4mm2 would be adequate. for a 15A and 30 A fuse
But if overload protection is not required, why the increased cable size.
Thanks .
The cooker and the shower, have a load that can be altered. But are still classed as a fixed load as you can't go over its kW rating?
Am I wrong?
I ask in relation to the BS3036 fuse.
I have always thought that the 0.725 Cf factor applied, to any circuit protected by a BS3036.
But looking at equation 5 in BS7671 the correction factor for the BS 3036 is not used.
As it can not be overloaded, the design current is used in any cable calculations.
But I thought the historical reason why immersions were generally on 2.5mm2 and cookers were 6mm2 cable, was down to the correction factor.
If condition allowed, 1.5mm2 and 4mm2 would be adequate. for a 15A and 30 A fuse
But if overload protection is not required, why the increased cable size.
Thanks .