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Wire resistances

Old 10-28-2016, 10:06 PM
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Default Wire resistances

Was checking some splices I soldered to make sure connections were good and found this.

http://hyperphysics.phy-astr.gsu.edu...es/wirega.html
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Old 10-28-2016, 10:16 PM
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And I know the chart says solid wire. I looked at some with stranded wire and they were the same or close. Here's some more useful info for wiring.
Attached Thumbnails Wire resistances-image.png  
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Old 10-29-2016, 11:11 AM
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Nice chart, thanks for posting!


On a side note if your not certain of the exact draw always error to the larger size you will never go wrong with a larger wire.
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Old 11-01-2016, 09:21 PM
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What you posted is called an "ampacity chart" for 12 volts. The biggest problem with using a random one is that you have no idea what voltage loss percentage or temperature the person who made the chart used to arrive at the result. Kind of a crapshoot with most of them.

As wire temperature increases, so does the resistance, meaning it will carry fewer amps before meltdown. It also translates to higher voltage loss at the receiving end of the cable.
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Old 11-05-2016, 09:37 PM
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Originally Posted by machinisttx View Post
What you posted is called an "ampacity chart" for 12 volts. The biggest problem with using a random one is that you have no idea what voltage loss percentage or temperature the person who made the chart used to arrive at the result. Kind of a crapshoot with most of them.

As wire temperature increases, so does the resistance, meaning it will carry fewer amps before meltdown. It also translates to higher voltage loss at the receiving end of the cable.
I figured it was an average at like room temp or something. Just a base to go by under average conditions. Just more reason to go with the larger wire if the smaller gauge is close to the limit.
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