Discuss earth sizes for SWA run in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

J

jellen

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hi

Wonder if anyone can help, I dont have my regs or OSG on me and need to answer this question today.

We need to install a 35mm swa 4 core (3 Phase and N) The length of run is 110m and the earthing arrangment is TN-C-S.

My question is, do we need to run a separte CPC and if so what size?? worried abut Volt Drop.:confused:

Thanks

James :D
 
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G

Guest123

  • Thread Starter Thread Starter
  • #2
Hi James.

As a matter of course I would be installing an additional CPC of 25mm regardless.

Cheers.
 

ian.settle1

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Mentor
Arms
Surely who ever did the cable calcs to decide what sized cable to use should have worked out what size earth was required?
 

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