This Question of the Day, concerning 3 X 70mm SWA cable through 80m of 100mm ducting, is answered by Prysmian (Theme – Cables and Wiring):
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| What bend radius when in ducting? |
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This Q & A is one of thousands posted in our Technical Expertise area, and answered on a daily basis by our Voltimum Experts.
Question: We have to pull a 3 X 70mm SWA cable through 80m of 100mm ducting. There will be a bend at each end up to the electrical switch room. The cable run between is more or less straight. Can you tell me what a reasonable bend radius would be to allow satisfactory pulling of the cable?
Answer: Our recommended installation minimum bend radius for SWA cable with shaped cores is eight times the overall cable diameter. So, for your cable, this is 8 X 34 = 270 mm. This is acceptable for a 600/1000V cable. For higher voltages the recommendation is 12 X the OD. If you can go for a bigger bend, obviously this is always better.
Also take care...ensure that the pull is even etc. This is referred to in the Wiring Regulations BS7671:2008, and also in the cable standard.
You can find this, and other information, on the data sheets on our website: www.prysmian.co.uk
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: www.voltimum.co.uk/consult.php?universe=consult.index.questions
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