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H07 for overhead supply cable

Looking at replacing an overhead supply cable, support by catenary wire 6m above ground on a farm now renting buildings out to small businesses.

Cable is supplying a small barn that will be used by a family to store and work on stock cars 

Current cable is T+E supported by catenary wire, it's been cut at both ends, unsuitable for outside use, therefore replacing it.

First thought was armoured cable, but then thinking that something like HO7-rn-f might be better. 

        No armoured and surface clipped, so no need for RCD protection on this submain

        Less weight and more flexible, 

Any reason not to use HO7-rn-f ?


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  • Is 6m heigh enough on a farm.  There was a recent story in the news of a tipper lorry hitting an over head power line on a farm.  The driver was electricuted when the tipper with the hydraulic arm of the tipper lorry extended came into contact with an 11kV overhead power line.

  • Indeed - cable routes along hedge lines and similar where nothing will drive under are preferred to going across the yard, but of course that is not always possible.
    However, it is not the most dangerous thing on most farms by a long way - that is seems is currently cows.  https://www.hse.gov.uk/agriculture/resources/fatal.htm  farms are 21times more fatalities per person than the UK industry average apparently.

    It used to be worse, hence the old public safety films to scare us from playing about there
    https://www.youtube.com/watch?v=_we-3Uqu5sw   This is the short version.
    Junior school me recalls this and this other one about railway safety (The Finishing Line) as being indelible memories.
    https://www.youtube.com/watch?v=SXGqwCbeFD8

    Mike.

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