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SWA cable on wooden fence and other options

Alan B

I am looking at how best to run a supply cable to a shed, all options with 4mm swa.

1) 20m run direct from main fuse board along brick wall that is bowing out and will have to be replaced due to structural issues, also small chance drilling will trigger cracks in the wall that must be strained by the bow.

2) Clipped to a brand new fence with some roses growing up it, not good practice, do water based wood treatments cause problems for insulation.

3) Bury it in a trench, trench likely to be disturbed when extension is built in a couple of years time.

So I don't have any really good options, partly because the cable route is much simpler option 2 seems best to me, but depends if water based wood treatments cause cables to break down. Also don't want to be responsible for a 6ft high brick wall collapsing on someone.

Interested in opinions of others and if anyone has data on the impact of water based wood treatment.

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    Alan B said:
    small chance drilling will trigger cracks in the wall

    Been there, done that! Drill a hole and next thing is that you need to re-lay a couple of courses of bricks (which were not laid well originally).

    I am sure that there are constraints which have not been mentioned, but one option is to rebuild the wall first. If that needs to wait, then the run of SWA could be regarded as temporary and accordingly, deterioration due to preservative, or rose fertiliser, or pesticides, etc. might be acceptable.

    Like Andy, I doubt that water-based agents will be a problem (save for ingress), but could you ask the manufacturer?

  • 0 in reply to Chris Pearson

    Thanks for your thought and concuring with my view that water based wood treatment is OK. I am considering this as a temporary isherwood install, but aware 2 year projects often turn in to 10 year projects.

    Looks like there is probably 100k in work planned, not sure how we'll customer is positioned to fund it.

    The wall I would be clipping to is 6ft high, 10m long. Something like a 4 or 5 inch bow in the bottom. No weight against it, the building next to it has had subsidence. If I clipped near the top there would be less stress on the brick joints. I was thinking of closer to the bottom, where I assume the joints are under tension from the warp.

    I think I will stick with going along the fence as it should be good for at least 5 years and about half the cost

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  • 0 in reply to Chris Pearson

    Thanks for your thought and concuring with my view that water based wood treatment is OK. I am considering this as a temporary isherwood install, but aware 2 year projects often turn in to 10 year projects.

    Looks like there is probably 100k in work planned, not sure how we'll customer is positioned to fund it.

    The wall I would be clipping to is 6ft high, 10m long. Something like a 4 or 5 inch bow in the bottom. No weight against it, the building next to it has had subsidence. If I clipped near the top there would be less stress on the brick joints. I was thinking of closer to the bottom, where I assume the joints are under tension from the warp.

    I think I will stick with going along the fence as it should be good for at least 5 years and about half the cost

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