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7 STRAND TAILS V 19 STRAND

John Peckham
I changed a consumer unit  a week ago and for the first time used 19 strand tails instead of 7 strand tails. I have to say they are much easier to use and manipulate in tight spaces. I think they are a much better for terminating in a cage clamp as they fill the space under the cage making more contact than 7 strand.


I purchased them from Tool Station and found they were made by Doncaster cables. A bit more expensive than 7 strand but worth the extra money. 


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    I have no idea Andy. UKPN  will not allow Tri Rated if they are presented with them for connection to heads or transformers. I cannot see why they could not be terminated in a meter with tunnel terminals? Just  a different method of preparing the ends, for cage clamps take out the manufacturers 1/2 twist and flatten the copper to make a spade shape that touches all 4 sides of the cage clamp. For tunnel terminals consolidate the ends by putting an additional twist in to the manufacturers 1/2 twist. If you are really old school wrap a 1mm copper binding wire over the consolidated ends. 


    In my case my ends went in to single pole Henley blocks (AKA service connectors) and the cap screws tightened with my nice new Boddingtons T 3mm insulated key, my installation so nothing to do with the DNO or meter operator. Nice tight fit and plenty of contact area and 2 screws to secure the copper. The Boddingtons T key is the same one as the DNOs use for heads, Henleys and meters which I purchased at an Elex show last year. If you do not have one and terminate tails on a regular basis I would recommend you get one!
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  • 0
    I have no idea Andy. UKPN  will not allow Tri Rated if they are presented with them for connection to heads or transformers. I cannot see why they could not be terminated in a meter with tunnel terminals? Just  a different method of preparing the ends, for cage clamps take out the manufacturers 1/2 twist and flatten the copper to make a spade shape that touches all 4 sides of the cage clamp. For tunnel terminals consolidate the ends by putting an additional twist in to the manufacturers 1/2 twist. If you are really old school wrap a 1mm copper binding wire over the consolidated ends. 


    In my case my ends went in to single pole Henley blocks (AKA service connectors) and the cap screws tightened with my nice new Boddingtons T 3mm insulated key, my installation so nothing to do with the DNO or meter operator. Nice tight fit and plenty of contact area and 2 screws to secure the copper. The Boddingtons T key is the same one as the DNOs use for heads, Henleys and meters which I purchased at an Elex show last year. If you do not have one and terminate tails on a regular basis I would recommend you get one!
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