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Overhead cable suitability for cat wire

Dave Thomas

Looked at a job for a customer and the cable supplying the shed in their garden is a pvc T&E about 5 m up spanning about 5 metres. There's some sort of catenary wire (looks like a bit of old fencing wire) and its snapped so the cable is holding the wire up. I'm going to replace it but wondered whether NYY-J cable would be considered suitable rather than SWA? it's lighter and seems to be widely considered fine for outdoor use, and is obviously quicker to joint. SWA is obviously stronger but if the cat wire does its job properly would the cable itself require mechanical protection? I cant find a reg?

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    5m span is probably OK even in copper more than ~ 2.5mm2 without catenary wire.

    Cat wire is not that expensive.

    If lifespan/corrosion  is likely an issue then s/steel  wire is possible,  look at yaught/boat type places.

    Almost any cable can be used overhead, -even arctic flex or T and E is OK, but needs regular inspections- especially in location is where sunlight is strong and can embrittle plastic, but it takes several years. NYY is nice in that it has a definite UV spec, but that is not essential. 

    Like any non armoured cable, when buried in a wall it needs to follow lines of least surprise, or be protected against discovery by drills etc, much the same as T and E. When on view, no routing restrictions apply.

    Mike.

      

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  • 0

    5m span is probably OK even in copper more than ~ 2.5mm2 without catenary wire.

    Cat wire is not that expensive.

    If lifespan/corrosion  is likely an issue then s/steel  wire is possible,  look at yaught/boat type places.

    Almost any cable can be used overhead, -even arctic flex or T and E is OK, but needs regular inspections- especially in location is where sunlight is strong and can embrittle plastic, but it takes several years. NYY is nice in that it has a definite UV spec, but that is not essential. 

    Like any non armoured cable, when buried in a wall it needs to follow lines of least surprise, or be protected against discovery by drills etc, much the same as T and E. When on view, no routing restrictions apply.

    Mike.

      

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