Wire gage ?

[Jerry]

I have 24ga,22ga, 21ga,20ga and 18ga.

Is there any 2 in this group that are 1/2 size. ? is 24ga. half the ga of 18ga.

Or any inthis group that are half?

                       Thanks.

                          JK TAS Jerry

[johnlm]

Jerry,

The rule of thumb (very close approximation) is this.  Go up 3 guage sizes and you have 1/2 the circular mills; go down 3 guage sizes and you have 2X the circular mills.  So awg 21 is double awg 24. and awg 18 is double awg 21 etc.

Johnlm

[zubbly]

hi jerry!

if you think this way, you will not need a wire chart to find equivalents in other sizes.

take any wire gauge size (example #18) count up 3 sizes= using 2 #21 gauge

1. #17 would be equal to 2#20
   
1. #15 would be equal to 2#18
   
1. # 20 would be equal to 2#23
   
2. #15 would be equal to 4#18
   
   

to find equivalent in 1/2 size gauge wire (example #181/2) count up 3 sizes and 4 sizes.

so 1#181/2 would be equal to 1#21 and 1#22

1. #151/2 would be equal to 1#18 and 1#19
   
1. #171/2 would be equal to 1#20 and 1#21
   
1. #221/2 would be equal to 1#25 and 1#26
   
   

hope this helps  

zubbly

[zubbly]

hi again jerry!

forgot to answer your main question.  #21 would be 1/2 the size of #18

zubbly

[SparWeb]

First hit on a Google search:

http://www.powerstream.com/Wire_Size.htm

[richhagen]

If the rule of thumb that increasing the size by 3 guages isn't sufficient for you, here is a wire resistance calculator I wrote a while back, you can enter a guage and length and calculate the resistance, and then blank out the guage and change the units to square millimeters and recalculate, comparing for different guages.  Or you can just use it as it is designed to calculate the resistance in a wire of certain cross sectional area and length.  Rich Hagen

http://www.otherpower.com/images/scimages/742/WIRECALC.exe

[Jerry]

Thanks a bunch guys. Sounds like I have the wire I need for the next project.

                   JK TAS Jerry