R1 and r2 values

[Hogshaw]

If I have an overall resistance can some help me figure out how I would work out just the r2 value??

e.g

a ring final circuit is installed with 4.mm live conductors and a 1.5mm c.p.c if the line loop measures 0.44 ohms, what is expected c.p.c value?

 

[Tiny Spark]

Am I missing something? Why not just measure it? Also why have you got a 1.5mm cpc on a 4mm ring? Shouldnt it be 2.5?

 

[Hogshaw]

Am I missing something? Why not just measure it? Also why have you got a 1.5mm cpc on a 4mm ring? Shouldnt it be 2.5?

This is a 2395 exam question, sorry should have said

 

[Tiny Spark]

Well you could use the resistance per meter table to work out the length of run for the 4mm cable, then use the same table to work out the resistance of the 1.5mm.

Of course that is purely hyperthetical and not taking into account anything other than the loop.

 

[Hogshaw]

They don't give any more resistances only the one I've already stated..

thanks

 

[Tiny Spark]

The table is in the OSG, Not framiliar with the 2395 but I assuem you are still allowed to use your books?

 

[Hogshaw]

The table is in the OSG, Not framiliar with the 2395 but I assuem you are still allowed to use your books?

No books allowed

 

[Tiny Spark]

Ohhh......

Just to check something here though as you are talking about a ring do you need to work out the R2 value or the CPC loop?

 

[Hogshaw]

I need to work out the r2 value of the circuit

 

[HappyHippyDad]

Are you saying that r1+r2=0.44Ω?

Also this is definitly a ring? and definitely 4mm?