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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  • Just to add to this, it's worth bearing in mind that H07RN-F has a maximum operating temp rating of 60 degrees Celsius when fixed or flexed.

    A few cabling manufacturers require a "fixed protected installation" to permit the higher operating temp of 70 degrees (assuming you'll need to achieve compliance with 512.1.5 of BS 7671).

    Yes, the cable is out of reach and it's likely that the cable temp will be low BUT I do think it's worth bearing in mind.