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H07 for overhead supply cable

Alan B

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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    What does the H07 manufacturer say about the sheath's UV resistance, etc.? All else being equal back should be better than other colours (which presumably the H07-RN is, as I'm never seen anything else) but I'm less sure about rubber vs PVC for permanent use outside. It's a slightly different situation to say outdoor extension leads that would typically be moved (and hence inspected) on a regular basis, may spend a lot of time in storage rather than outside, and general bashing about possibly means they don't have the expected service life of a permanent installation.

       - Andy.

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  • 0

    What does the H07 manufacturer say about the sheath's UV resistance, etc.? All else being equal back should be better than other colours (which presumably the H07-RN is, as I'm never seen anything else) but I'm less sure about rubber vs PVC for permanent use outside. It's a slightly different situation to say outdoor extension leads that would typically be moved (and hence inspected) on a regular basis, may spend a lot of time in storage rather than outside, and general bashing about possibly means they don't have the expected service life of a permanent installation.

       - Andy.

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