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EF: Steel conduit maximum capacity for 90 degree thermosetting cables

  • Thread starter Charlie_Don't_Surf
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EF: Steel conduit maximum capacity for 90 degree thermosetting cables

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Charlie_Don't_Surf

Steel conduit maximum capacity for 90 degree thermosetting cables

Hi, as part of a project for my level 3 C&G 2365 course, we need to provide power to a number of 230v single phase socket outlets on a ring final circuit for a workshop area within a building designed for light industrial work.

The considerations about current carrying capacity and other aspects are dealt with elsewhere in the project, the specific part this question relates to is conduit selection.

I am needing to calculate what diameter of conduit I would need to use to provide power to a number of metal clad socket outlets to be used in that area. Basically, I need to prove that the diameter of conduit I select would be adequate, given that, if possible, I will be looking to run 2 x 2.5mm 90 degree thermosetting cables (line and neutral) and one CPC (probably 1.5mm CSA I'm not 100% sure yet, but for the sake of getting some guidance here let's just say it's a 1.5mm CPC), and then if necessary I will run another piece of conduit back up to the trunking with the same number and type of cables, for the continuation of the ring.. OR if I could get away with it I would prefer to run both sets of 3 cables in the same piece of conduit, so 4 x 2.5mm and 2 x 1.5mm 90 degree thermosetting singles.

We are told in the brief that we must use 90 degree thermosetting non sheathed cables (i.e. singles, I'm told these are called 'tri-rated' if they are the 90 degree thermosetting type) and that the conduit must be steel. The runs would not have any bends, they would drop straight out of a steel trunking section directly down into the metal socket outlets, and would be less than 3 metres in length.

I note that the OSG appendix E gives details about how to calculate maximum number/combinations of 70 degree thermoplastic cables which can be safely run in conduit of various sizes, but I can't find any details there about thermosetting cables of 90 degree. Nor anything definitive online which contains any suggestions about conduit size limitations with regard to 90 degree...

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