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Terminating Twin and Earth

nicemark
I have been arguing about the methods of separating out the ends of twin and earth cable.


An old accepted trade method was to simply grip the earth wire and tear it out of the insulation to split the ends open.

However this puts considerable strain on the earth wire and in the case of 1mm wire it is very easy to stretch a significant amount. 


I was wondering if you there is data or evidence to demonstrate that this method is not acceptable. 

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  • 0
    Rob Eagle:

    "Something slightly wrong with your units there."


    12.6 Mega Newton force, 12.6 x 10^6.


    How much longer did the wire become after stretching it by hand, or did you just get out the kinks?  It broke at the pliers due to the edge of the pliers cutting into the soft copper, a significantly much lower force is required to do that.


    That's the force exerted by gravity on about 1000 tonnes, so your wee copper wire will lift a small ship will it?


    I tried again. The 1 mm² wire stretched by 30% before it broke in the stretched part, not at the pliers.


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  • 0
    Rob Eagle:

    "Something slightly wrong with your units there."


    12.6 Mega Newton force, 12.6 x 10^6.


    How much longer did the wire become after stretching it by hand, or did you just get out the kinks?  It broke at the pliers due to the edge of the pliers cutting into the soft copper, a significantly much lower force is required to do that.


    That's the force exerted by gravity on about 1000 tonnes, so your wee copper wire will lift a small ship will it?


    I tried again. The 1 mm² wire stretched by 30% before it broke in the stretched part, not at the pliers.


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