help with a little electrical maths problem

[HumptyDumpty]

I'm trying to calculate the length of a ring in 4mm twin, but I'm unsure if my approach is correct given the resistance values I have, should I be dividing R1R2 by the conductor resistance per meter directly, or is there another step I'm missing? looking for clarification on the correct method.

 

[zen'heist'dj]

If you check the resistance specs for 4 mm twin cable it's clear that dividing r1r2 by the conductor resistance per meter gives the total length of the ring. Don't forget to account for both legs of the ring circuit when calculating. Does your resistance value include both conductors or are you working with just one?

 

[circleofdown]

I'm trying to calculate the length of a ring in 4mm twin, but I'm unsure if my approach is correct given the resistance values I have, should I be dividing R1R2 by the conductor resistance per meter directly, or is there another step I'm missing? looking for clarification on the correct method.

I don't really like math... Anyway, I'm pretty sure it's r1+r2 x 100 divided by the resistance per meter of the conductor pair. Don't misunderstand @zen'heist'dj looks like he's making a product of r1 and r2.