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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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    I agree with this method. During my time as a college lecturer, I occasionally helped with Wiring and Regulations classes and this is the method we taught students. An alternative is to snip down both sides of the cable with the pliers and pull on the insulated conductors, but less easy. We discouraged the usage of knives for the reasons given.


    Another reason,  probably the main reason, for putting sleeving on the earthing conductor is to avoid a chance contact with another terminal. I once came across a case where this had happened on a socket outlet. The uninsulated earthing conductor had snagged the live terminal and was completely fractured in the ensuing flash, leaving the portion connected to the earth outlet welded to the live terminal - nasty!
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  • 0





    1928 Posts






     



     





    I agree with this method. During my time as a college lecturer, I occasionally helped with Wiring and Regulations classes and this is the method we taught students. An alternative is to snip down both sides of the cable with the pliers and pull on the insulated conductors, but less easy. We discouraged the usage of knives for the reasons given.


    Another reason,  probably the main reason, for putting sleeving on the earthing conductor is to avoid a chance contact with another terminal. I once came across a case where this had happened on a socket outlet. The uninsulated earthing conductor had snagged the live terminal and was completely fractured in the ensuing flash, leaving the portion connected to the earth outlet welded to the live terminal - nasty!
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