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Why isn't twin and earth cables used in commercial?

Former Community Member
Former Community Member

I was always taught that twin and earth cables should be used in domestic only and singles/multicore in commercial? 

Why is that ? I mean there isn't anything wrong with using 1.5mm2 twin and earth with 1.0mm2 CPC for lighting circuits.

Regards,

J

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    There is a potential issue about the prospective fault currents and reduced c.p.c. (especially where MCBs are used as the energy-let though tends to increases with increasing fault current) - as some larger commercial and industrial premises tend to have beefier supplies and hence higher fault currents.

    Using generic data (e.g. from BS EN 60898) you'd have a hard time proving that a 1.0mm2 c.p.c. was good above 3kA. 

       - Andy.

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    There is a potential issue about the prospective fault currents and reduced c.p.c. (especially where MCBs are used as the energy-let though tends to increases with increasing fault current) - as some larger commercial and industrial premises tend to have beefier supplies and hence higher fault currents.

    Using generic data (e.g. from BS EN 60898) you'd have a hard time proving that a 1.0mm2 c.p.c. was good above 3kA. 

       - Andy.

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