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support of overhead lines

Alan B

Just want to check my interpretation of guidance

Just thinking about how to get a cable across to a single level garage. Personally I would prefer to take it underground but suspect the customer won't got for that.

From my interpretation according to table D2 in the onsite guide I can run any PVC cable for a span of 3m without any additional support, but it needs to be 3.5m above the ground. Sounds like the customer has already purchased some 16mm SWA cable, which is way over the tope for what he needs.

The obvious choice is to use a pole on the garage side, personally never liked the look of that. I am considering using something like a 4 * 2 or 3* 2 beam across the roughly 2m gap at about 2.4m, any reason why it wouldn't be acceptable?

If I go for the pole it doesn't look like I need a catenary wire, but it may be the easiest way of supporting it to avoid chafing anyway.

I welcome suggestions,

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  • 0

    Thanks all for the responses.

    Its over a passage way between garage and house, having seen it today only about 1m wide.

    House is constructed with concreate slabs hung on the outside, which is going to make life interesting with drilling,

    I think I am going to stick with a strong support between the buildings at about 2.7 meters (height of the garage, with the support just below the holes to create a drip loop.

    The scaffold bar gave me an idea that galvanised hand rail would provide a good support and would be relatively easy to secure on to the walls. 

  • 0 in reply to Alan B

    16mm SWA is going to be quite weighty, even over a short span, so yes, something like a scaffold pipe or handrail pipe would be good if it can be secured sturdily at each end.

    I think the regs book dimensions stemmed originally from the risk of contact with bare live overhead conductors back in the day.

  • 0 in reply to whjohnson

    Yes, but they need to be at no less than 5.2 m. The table is nonsense. As I have said earlier, what is the difference between a passageway and a doorway?

  • 0 in reply to Chris Pearson
    Chris Pearson said:
    As I have said earlier, what is the difference between a passageway and a doorway?

    Most people woldn't try to carry a 10 foot ladder through a 6'6" doorway without lowering it first.

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  • 0 in reply to Chris Pearson
    Chris Pearson said:
    As I have said earlier, what is the difference between a passageway and a doorway?

    Most people woldn't try to carry a 10 foot ladder through a 6'6" doorway without lowering it first.

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