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

JakeF

New EF Member
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.
 

telectrix

Scouser and Proud of It
Respected Member
what's the earthing arrangement?
 

Risteard

Respected Member
So it's just being used as a cpc then?

Apply the adiabatic calculation to verify its adequacy then.
 

Strima

Electrician's Arms
What's the Ze at source of circuit?

Type/rating of OCPD etc?

Installation method?
 

davesparks

Forum Mentor
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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