Battery cables

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Battery cables

Postby Shuvit-pinto » 23 May 2006, 20:56

Ok, can someone explain to me what this all means for battery cables please:-

Example - 266/0.30, 20mm2, 9.5mm, ( I know this bit ) 135A

I am looking for 10mm2 so it says in the book so how do I know if I have the correct stuff I already have? And what would the above read for 10mm2 cable:? :oops:
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Postby Harry Flatters » 23 May 2006, 21:28

266 strands of 0.30 mm dia each strand, total cross sectional area of conductor 20 mm square, cable OD 9.5 mm, 135 amp capacity continuous rating.
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Postby Shuvit-pinto » 23 May 2006, 22:00

Thanks Harry.

I think that will help.
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Postby Shuvit-pinto » 23 May 2006, 22:03

OK so how doeas it arrive at this then??

total cross sectional area of conductor 20 mm square if the OD is 9.5 :roll: Stick with me. I am trying to learn about lectriks as I know very very little. :?
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Postby Herbie_Flowers » 23 May 2006, 23:01

remember this equation in school Mark Pi × r2
well the radius is 0.15mm so we square it (0.15 x 0.15) which equals 0.0225mm
then multiply by Pi which is 3.142 so that's 0.0225 x 3.142 = 0.070695mm
now multiply it by the number of strands - 266
so it's 0.070695 x 266 = 18.8mm of copper and near as damn it 20mm with the insulator wrapped around it.
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Postby Shuvit-pinto » 23 May 2006, 23:24

Wow, thanks for that, nicley explained and understood, I think :? :wink:
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Postby chris(not) » 24 May 2006, 13:03

While we're at it... it's always safe to use a wire with a greater copper cross section than specified (if you can fit it) but not the other way 'cos it may overheat or drop the voltage too much. You may also find wire specified in AWG (American Wire Gauge) sizes (lower number, bigger cross section). they don't correspond exactly to european sizes but 6 AWG (about 13 sq mm) would be OK for a 10 sq mm application. Your 20 sq mm size sounds American (4AWG) 'cos 16 sq mm and 25 sq mm are standard euro sizes.

http://www.alphawire.com/PAGES/379.CFM

has lots of useful conversion info including resistance etc. Other pages in same site give info on current ratings too, but for car use generally volt drop becomes a problem before you exceed the max current rating for a cable.

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