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Crimping of flexible cord conductors

PG
Like most of us, I often crimp flne strand conductors, especially for screw terminals but do not do this for domestic lamp holders and roses etc.

I thought that I would check Section 526 (Electrical Connections) of the Regs but did't find a clear statement of requirements for crimped ends. 

I was particularly unsure of what 526.9.1 was specifying for fine wire conductors "conductor ends shall be suitably treated".


Any guidance or comment would be appreciated.


Regards
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    I replaced a consumer unit, the guy who had installed the previous consumer unit had used insulated boot lace ferrules on the 25 mm meter tails inside the 35 mm cage terminals of the main switch.


    I just pulled the ferrules off with my fingers and threw them away, they had not been crimped with a tool and even if they had I don’t think it would have made much difference. 


    Now we can buy nineteen strand meter tails they will splay out more in the cage terminals and presumably fit better, so with either type of meter tail in a cage clamp it would appear that a ferrule would be detrimental.


    However with fine strands under a screw some strands will be torn and severed, hence the benefit of the protection from the ferrule improves the termination.
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  • 0
    I replaced a consumer unit, the guy who had installed the previous consumer unit had used insulated boot lace ferrules on the 25 mm meter tails inside the 35 mm cage terminals of the main switch.


    I just pulled the ferrules off with my fingers and threw them away, they had not been crimped with a tool and even if they had I don’t think it would have made much difference. 


    Now we can buy nineteen strand meter tails they will splay out more in the cage terminals and presumably fit better, so with either type of meter tail in a cage clamp it would appear that a ferrule would be detrimental.


    However with fine strands under a screw some strands will be torn and severed, hence the benefit of the protection from the ferrule improves the termination.
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