This Q & A of the Day - about support for a 15m span of 6mm concentric cable, is answered by Prysmian (theme - Cables & Wiring):
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Question: I am proposing to supply a farm building with a 15m span of 6mm
concentric cable. Mechanical protection is not required. The supply in the farm building will be
TT, as I am not exporting the earth from the
PME farmhouse.
I would like advice on how the cable should be supported.
I have seen cables anchored at either end with a pre-formed steel wire helix, but I've been unable to find a supplier of this product. I've also seen a loop formed in the concentric cable by passing it around a ceramic bobbin, with the loop held together with cable ties.
I would welcome any advice on the mechanical limitations of concentric cable. If necessary, I could support the cable with a steel catenary wire, but the two methods outlined above seem neater and quicker.
Answer: Prysmian does not manufacture a 6mm˛ concentric cable and, therefore, having no data on this product, we are unable to comment on its mechanical strength or other limitations.
Can you ask the manufacturer of this cable for advice?
As a general rule we say that the maximum load for installation of a cable is 5kg/mm˛ of copper conductor present, provided that the load is applied to the conductors.
I imagine that the springs to which you refer take any load from the ends and allow the cable to move (in the wind) without fatigue. I have seen this on telephone cables. It may be more appropriate to refer your question to the ECA or the NICEIC, which you can do through this site.
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