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11th October 2005, 11:45 AM  #1 
diyAudio Member
Join Date: Apr 2005
Location: NJ

Wire gauge calculator?
Does anyone know what the formula is to determine the resulting wire gauge of two or more combined wires?
ie: What gauge are two 24ga wires once combined? Tks, Paul 
11th October 2005, 12:30 PM  #2 
diyAudio Member
Join Date: Sep 2004
Location: Bungawalbyn, NSW

Two wires in parallel is equivalent to 3 guages larger.
2 x 24g = 1 x 21g you can calculate it also. 24g = 0.021" or 0.533mm diameter cross sectional area = Pi[(dia/2)^2] or Pi(r^2) Pi=3.14 (actually 3.1415927) and is always the same for any equation using Pi. therefor 0.021"/2 =0.0105 then 0.0105^2= 0.0001102 then area= 0.0001102x3.14=0.0003463"^2 2 wires=2x0.0003463=0.0006927"^2 working back: 0.0006927/3.14=0.0002205 then r= sq.rt 0.0002205=0.01485" then diameter=2x0.01485"= 0.0297" Actually 21g=0.02845", but it's close enough! It works in metric too. Looks long winded, but if you use it often, it's 20 seconds work with a calculator. 
11th October 2005, 05:13 PM  #3 
diyAudio Member
Join Date: Apr 2005
Location: NJ

That's perfect, thanks Bob!
Rgds, Paul 
11th October 2005, 05:18 PM  #4 
diyAudio Member
Join Date: May 2003
Location: San Diego, USA

If you would like more information on wire thicknesses and wire properties, note that the Krell Build Wiki has a link to Post #2677 of the Krell thread ... linking to a car audio (wire) website that has much useful information on wire and wire thicknesses, with useful calculators.

11th October 2005, 06:09 PM  #5  
diyAudio Member
Join Date: Apr 2005
Location: NJ

That's interesting. I actually paid this guy for the CD of his site two years ago...I wonder if I have it still. Thanks for the reminder.
Quote:


11th October 2005, 09:16 PM  #6  
diyAudio Member
Join Date: Jun 2003
Location: Chamblee, Ga.

Quote:
Even quicker : summed effective dia. = dia. of one wire*SQRT(number of wires) Since 24 ga is closer to ~0.0201" dia. according to the chart I used at work: ~0.0201*SQRT(2) = ~0.2843", or very close. Going to extremes with (32) wires it adds up though since we should get a 15 ga difference, or 9 ga = 0.1144, but it's still plenty close enough compared to 10 ga = 0.1019" : 0.0201*SQRT(32) = ~0.1137" GM
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12th October 2005, 09:39 AM  #7  
diyAudio Member
Join Date: Sep 2004
Location: Bungawalbyn, NSW

Quote:
Makes sense really doesn't it? Dims ^2= Area Sq.Rt.Area= Dims! Of course. 

12th October 2005, 11:36 AM  #8 
diyAudio Member
Join Date: Dec 2004
Location: Cincinnati, Ohio

10 wires will be the equivalent of 1 wire 10 gauges lower, and 3 gauges lower is a doubling, its a logarithmic scale based on the copper area.
Solid wire diameter increases/decreases by a factor of about: 2 every 6 gages, 3 every 10 gages, 4 every 12 gages, 5 every 14 gages, 10 every 20 gages, 100 every 40 gages, 
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