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Looking for information about wire size and current rating

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yoyo

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awg 28 ampacity

I am looking for info on the wire gauge vs current/voltage rating. Anyone knows a look-up table somewhere? Thanks in advance
yoyo
 

Element_115

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wire size vs current

Here's a general guide

Copper wire resistance table

Feet/Ohm Ohms/100ft Ampacity* mm^2 Meters/Ohm Ohms/100M
AWG
10 490.2 .204 30 2.588 149.5 .669
12 308.7 .324 20 2.053 94.1 1.06
14 193.8 .516 15 1.628 59.1 1.69
16 122.3 .818 10 1.291 37.3 2.68
18 76.8 1.30 5 1.024 23.4 4.27
20 48.1 2.08 3.3 0.812 14.7 6.82
22 30.3 3.30 2.1 0.644 9.24 10.8
24 19.1 5.24 1.3 0.511 5.82 17.2
26 12.0 8.32 0.8 0.405 3.66 27.3
28 7.55 13.2 0.5 0.321 2.30 43.4

I would use less current (~ 15% less) for AWG 20 -->AWG 28

Hope this helps
 

flatulent

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easy way to remember

Here is an easy way to remember. 10 Ga wire has 1 ohm per 1000 feet. The resistance changes as power dB. going 10 more gague numbers to 20 gaue gives you 10 ohms per 1000 feet.

The usual sizeing for long distances is a 2% voltage drop maximum

Fusing current is 333 A for the 10 Ga wire with again the power dB rule.

The general short length limits are 30 A for 10 Ga and scaling by a factor of 4 for 10 Ga number differences.
 

johnyaya

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Voltage and current are VERY dependent upon insulation type, not just the gauge of the wire. The insulation usually melts before the wire when put to the limits concerning current. The voltage rating is completely dependent upon insulation. I have a chart regarding this info but I can't upload info till Monday (it's at work). You can look to wire manufacturers tech info web pages for more info (check out www.belden.com ).
 

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