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Cable current carrying capacities

Andy Crawford

Morning all, I have a property wired in old twin cable with no earth. the cable is tinned copper (or so I believe) and I am struggling to find a table in the regs book stating its current carrying capacity. Would it just be classed as copper conductors?

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    You will very likely be in imperial sizes…

    www.daenotes.com/.../comparison-of-imperial-and-metric-conductor-sizes


    Does this help?

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    Is a re-wire overdue?

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    Would it just be classed as copper conductors?

    If tinned copper, yes. Be careful though, there was a fashion in about the same era for plain aluminium conductors which can look similar - and which have significantly higher resistance (usually necessitating going up a standard size or two for an equivalent capacity) and can have all sorts of problems especially at terminations.

       - Andy.

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    Worth checking if you have wooden back boxes as well?  Might be worth putting up a picture of the cable in question?

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