Determine the resistance of a conductor and the volt
drop per ampere metre at 70°C for a 95 mm2 pvc/swa/pvc copper cable.
The temperature coefficient of resistance is 0.004 per °C.
R70 ( resistance at 70 degrees ) = R20 [ 1+( temperature coefficient of resistance of copper X's temperature difference ) ]
The Attempt at a Solution
Hi there folks!
I have the above question as part of work I'm doing on a course that I'm studying.
I've found what the resistance/meter is by using the following equation:
R70 ( resistance at 70 degrees ) = R20 [ 1+( temperature coefficient of resistance of copper X temperature difference ) ]
I was provided with a table which showed the resistance/meter for cables at 20 degrees.
My notes have in all examples given the volt drop per ampere per meter so I'm not 100% sure on how to obtain it myself. I'm thinking that this resistance is the same value as volt drop per ampere per meter as using ohms law V = I x's R and therefore 1 amp multiplied by R70 from above equation should give a volt drop per ampere per meter.
Is my thinking correct?
Any thoughts would be much appreciated!