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Topic Title: CU/XLPE/SWA cable sizing - Volt drop
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Created On: 06 March 2013 12:35 PM
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 06 March 2013 12:35 PM
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Mattysmith1983

Posts: 81
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
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Avatar for OMS.
OMS

Posts: 19857
Joined: 23 March 2004

Have you looked at Appendix 4, section 6 et seq yet ?

Regards

OMS

-------------------------
Failure is always an option
 06 March 2013 02:05 PM
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Mattysmith1983

Posts: 81
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
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Avatar for OMS.
OMS

Posts: 19857
Joined: 23 March 2004

Cos angle theta = 0.9

angle theta = Cos^-1 = 25.85 degrees

Sin angle theta = 0.435

Regards

OMS

-------------------------
Failure is always an option
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