Appendix 4, section 6.1 equation 6

Sorry -I was a bit quick with the typing when I wrote that, its not the clearest.

Yes these are not percentage changes, but absolute multipliers /dividers, depending  what you are calculating and you need to keep your wits about you.

The book value for  voltage drop assumes fully loaded, so 30C ambient and 70C in the copper core or r 90C for some cables. 

Here your ambient is raised, but you will see less than the 40C rise, a lot less than a 40C rise actually (that is the thing with squared currents are really powers - I squared R and all that) The assumption is that temp rise is linearly proportional to power dissipated in the cable, so all the correction factors that are linear scaling factors for current consumption become squared for heating and power loss..

mike

Sorry -I was a bit quick with the typing when I wrote that, its not the clearest.

Yes these are not percentage changes, but absolute multipliers /dividers, depending  what you are calculating and you need to keep your wits about you.

The book value for  voltage drop assumes fully loaded, so 30C ambient and 70C in the copper core or r 90C for some cables. 

Here your ambient is raised, but you will see less than the 40C rise, a lot less than a 40C rise actually (that is the thing with squared currents are really powers - I squared R and all that) The assumption is that temp rise is linearly proportional to power dissipated in the cable, so all the correction factors that are linear scaling factors for current consumption become squared for heating and power loss..

mike