Voltage drop vs wire gauge

CBHunter

Guys, is there a way to figure out what will be the voltage drop for 100 ft of 14 awg wire? What difference a 10 awg would do?
Of course I can put a voltmeter to measure it, but is it predictible?

icarus

Re: Voltage drop vs wire gauge

Try here,,,http://forum.solar-electric.com/showthread.php?t=29

Tony

mike95490

Re: Voltage drop vs wire gauge

CBHunter wrote: »

Of course I can put a voltmeter to measure it, but is it predictible?

Very predictable & repeatable.

link:
http://www.uwgb.edu/nevermab/voltage_drop_calculator_.xls

Assuming 10A @ (for your 100ft (one-way) wire (@70F))
14 ga 2.54V or 2.54%
10 ga 1.00V 1.00%

RCinFLA

Re: Voltage drop vs wire gauge

Wire Dia. Cir Ohm/1000' Vdrop
Size Mils Inch^2 @20C I max. @ 100'
00 364.8 0.1045 0.080 350.0 2.8
0 324.9 0.0829 0.100 250.0 2.5
1 289.3 0.0657 0.125 180.0 2.3
2 257.6 0.0521 0.160 150.0 2.4
3 229.4 0.0413 0.200 130.0 2.6
4 204.3 0.0328 0.250 100.0 2.5
6 162.0 0.0206 0.400 63.0 2.5
8 128.5 0.0130 0.655 63.0 4.1
10 101.9 0.0082 1.000 30.0 3.0
12 80.81 0.0051 1.600 20.0 3.2
14 64.08 0.0032 2.500 15.0 3.8

Take resistance per 1000 feet, divide actual wire length by relation to 1000' (100' = 1/10 of 1000')

Vdrop = I actual x times resistance of length of wire.

For #14 with 15amps -> (2.5ohms for 1000') x (100'/1000') x 15 amps = 3.75v drop