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Default Resistance per Meter for copper cable (R1+R2)

Hi

Can someone help out with this Electrical problem.
(I'm doing a CG2330 course)

Table 9A of the IEE On site guide only goes upto 50mm csa cable for the
values (R1+R2)

Eg
50mm Phase+CPC = 0.774 mOhms/m

What would you do if the conductor was say 70mm ???

Is there a formula I could use ?


Thanks

Leigh