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Cable size calculation

Mark Craig

I'm looking for the calculation to figure out the minimum cable size. Normally I just use some type of design software but I'd like to know the calculation. As an example I am supplying a 160A 3 phase load with 10m of 4 core swa cable installed on cable tray. This has been calculated at 35mm sq but I would like to know the formula to figure this out myself

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    It's not a single formula, but rather a list of quite a few criteria that that cable has to satisfy - some of which do need calculation. Things like voltage drop, Zs, current carrying capacity (which is influenced by a number of factors from ambient temperature to grouping to installation method), conductor operating temperature and so on.

       - Andy.

    (edit: Mike types quicker than me!)

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  • 0

    It's not a single formula, but rather a list of quite a few criteria that that cable has to satisfy - some of which do need calculation. Things like voltage drop, Zs, current carrying capacity (which is influenced by a number of factors from ambient temperature to grouping to installation method), conductor operating temperature and so on.

       - Andy.

    (edit: Mike types quicker than me!)

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