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Resistance per metre value for 25mm meter tails?

whjohnson

what is the resistance per metre value for 25mm meter tails? I have 2 rolls of old colour meter tails and would like to work out how many meteres there are on each roll without physically unrolling and measuring with a tape! A simple end to end measurement with a ohm meter would be much quicker.

many thanks in advance

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  • 0

    Perhaps you could weigh the cable and subtract the reel, divide that answer by the weight of 1 metre of cable 

  • 0 in reply to Newfutile

    I would also use weight, its how I usually estimate cable left on a real.

  • 0 in reply to Newfutile

    Thanks for the replies thius far.

    Cart and horse - to subtract weight of the wooden reel I would have to unwind the whole drum so no shortcut there. These were 100 metre rolls, one of red and one of black. I bought them back before the cable colours changed for £40 the pair and I reckon I have used roughly around 30 metres from each roll. The reels are heavy wooden affairs so would account for some of the weight. Been trying to decide upon the most profitable method of disposal - either sell both as is as a job lot, or strip the lot and weigh it in for scrap. I could cut 1 x metre and weigh it, then strip it and weigh the copper alone to get a figure for both. I saw the eland cable weight table which gives weight per kilometre, so 1000th of that figure would give me weight of one metre unstripped. I'm sure a chap called Roger Bryant, who used to post on here, has actually posted some figures for different types/sizes of cable but the forum has changed a few times since then.

  • 0 in reply to whjohnson
    Newfutile said:
    Perhaps you could weigh the cable and subtract the reel, divide that answer by the weight of 1 metre of cable 

    There seems to be an echo in here. ;-)

    whjohnson said:
    Cart and horse - to subtract weight of the wooden reel I would have to unwind the whole drum so no shortcut there.

    It ought to be possible to measure the drum, calculate its volume, and making a reasonable assumption about its density, obtain an estimate of its weight.

    whjohnson said:
    I could cut 1 x metre and weigh it, then strip it and weigh the copper alone to get a figure for both.

    No need for that. 1 m of cable has a volume of 25 x 10-6 m3. The density of copper is 8960 kg m-3 = 8.96 x 106 g m-3. So the mass of copper in 1 m is (25 x 10-6 m3) x (8.96 x 106 g m-3) = 224g.

  • 0 in reply to whjohnson



    one of red and one of black.
    <sarc>
    Probably could raise a fair amount more on Ebay sold in 1m lengths to folk doing battery work or who wish to restore their mains installations in period colours and confuse people about exactly when various non compliant things were installed. 

    </sarc>
    Mike

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  • 0 in reply to whjohnson



    one of red and one of black.
    <sarc>
    Probably could raise a fair amount more on Ebay sold in 1m lengths to folk doing battery work or who wish to restore their mains installations in period colours and confuse people about exactly when various non compliant things were installed. 

    </sarc>
    Mike

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