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 Topic Title: CU/XLPE/SWA cable sizing - Volt drop Topic Summary: Created On: 06 March 2013 12:35 PM Status: Read Only Linear : Threading : Single : Branch
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 06 March 2013 12:35 PM Matt01 Posts: 216 Joined: 25 July 2008 Hi there I'm currently looking at using a 35mm² 4-core CU/XLPE/SWA. using table 4E4A from BS7671 this is acceptable as the max current capacity in the book is 115A. Currently i have the following loads on each phase L1 = 50A L2 = 50A L3 = 70A Now the cable length is to be 110m buried in the ground via duct. I've looked into the volt drop, but what i'm after is to determine the volt drop taking into account operating temperature, and PF @0.9. Can anyone help me? 06 March 2013 12:46 PM OMS Posts: 22388 Joined: 23 March 2004 Have you looked at Appendix 4, section 6 et seq yet ? Regards OMS ------------------------- Let the wind blow you, across a big floor. 06 March 2013 02:05 PM Matt01 Posts: 216 Joined: 25 July 2008 Hi there I worked out everything except sin ø. I know my PF is 0.9 which is my cos ø, can you remind me how this is calculated? 06 March 2013 02:40 PM OMS Posts: 22388 Joined: 23 March 2004 Cos angle theta = 0.9 angle theta = Cos^-1 = 25.85 degrees Sin angle theta = 0.435 Regards OMS ------------------------- Let the wind blow you, across a big floor.
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