Discuss 10mm t&e submain cpc in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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JakeF

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I know there’s the adiabatic equation to work earth size but generally if you install a twin and earth cable for distribution, do you need to worry about the smaller cpc size

My situation is 20 metre 10mm t and e run and not using it to provide earth bonding. Will the 4mm cpc be adequate. 50A mcb not many circuits to feed.
 
So it's just being used as a cpc then?

Apply the adiabatic calculation to verify its adequacy then.
 
What's the Ze at source of circuit?

Type/rating of OCPD etc?

Installation method?
 
I know there’s the adiabatic equation to work earth size but generally if you install a twin and earth cable for distribution, do you need to worry about the smaller cpc size

Yes you do need to worry about it, whether it be a final or distribution circuit.
 

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