Q & A of the Day - CPC sizes in twin & earth cable - is there a table?

Published: 22 April 2008 Category: Q&A

Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This first Question of the Day, concerning CPC sizes in twin and earth cable, is answered by BASEC:

Q & A of the Day - CPC sizes in twin & earth cable - is there a table?

Question: Is there a table that lists CPC cross-sectional area (CSA) within modern twin and earth cables? If not, how is the CSA calculated for filling in the installation certificate?

Answer: The nominal sizes for CPCs for flat twin and earth cable are listed in each of the relevant BS standards. The regular cable type you describe is to BS 6004 Table 8.

For two and three conductor cables:

1.5 sqmm cable has 1.0 sqmm CPC
2.5 sqmm cable has 1.5 sqmm CPC
4 sqmm cable has 1.5 sqmm CPC
6 sqmm cable has 2.5 sqmm CPC
10 sqmm cable has 4 sqmm CPC
16 sqmm cable has 6 sqmm CPC

Please note that these are nominal sizes.

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Q & A of the Day - CPC sizes in twin & earth cable - is there a table?

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