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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
    wallywombat:
    Zoomup:

     Anyway, the 1.5mm2 C.P.C. and above of larger cables make good cheese cutters once the end of the cable has been cut slightly and the cut started. No problem.

    .




    But the issue isn't whether the cpc is effective as a cheese cutter; it's whether the act of bending then straightening each bit of the cpc under pressure in some way damages it - e.g by work-hardening it and/or stretching it etc.




    Yes I understand your concerns. The C.P.C. is strong enough to be used as a cheese cutter  in my experience and does not work harden. Any copper conductor can be bent several times during termination. I have not noticed any work hardening during these types of operation. The biggest danger is nicking a copper conductor, where then afterwards , it is likely to easily break clean through, especially 1.0mm2 sized copper conductors.


    Z.


Reply
  • 0
    wallywombat:
    Zoomup:

     Anyway, the 1.5mm2 C.P.C. and above of larger cables make good cheese cutters once the end of the cable has been cut slightly and the cut started. No problem.

    .




    But the issue isn't whether the cpc is effective as a cheese cutter; it's whether the act of bending then straightening each bit of the cpc under pressure in some way damages it - e.g by work-hardening it and/or stretching it etc.




    Yes I understand your concerns. The C.P.C. is strong enough to be used as a cheese cutter  in my experience and does not work harden. Any copper conductor can be bent several times during termination. I have not noticed any work hardening during these types of operation. The biggest danger is nicking a copper conductor, where then afterwards , it is likely to easily break clean through, especially 1.0mm2 sized copper conductors.


    Z.


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