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This is a simple table to provide you with all of the pertinent NEC code data for wires. If your looking for one place to see all conductor, properties Construction Monkey has it for you.

Conductor Material:

Insulation Type:

Conduit Material Type:

Size	Copper			Size		Impedance¹			Max Length²
	60°C	75°C	90°C	Diameter	Area	X_L	R_Cu	Z_eff	120V	208V	277V	480V
	60°C	75°C	90°C	Diameter	Area	Per 1000 feet			120V	208V	277V	480V
#14	20 A	20 A	25 A	0.11 in	0.01 in²	0.073 Ω	3.100 Ω	2.67 Ω	42 ft	73 ft	97 ft	168 ft
#12	25 A	25 A	30 A	0.13 in	0.01 in²	0.068 Ω	2.000 Ω	1.74 Ω	52 ft	90 ft	120 ft	207 ft
#10	30 A	35 A	40 A	0.16 in	0.02 in²	0.063 Ω	1.200 Ω	1.05 Ω	61 ft	106 ft	141 ft	244 ft
#8	40 A	50 A	55 A	0.22 in	0.04 in²	0.065 Ω	0.780 Ω	0.70 Ω	65 ft	112 ft	149 ft	258 ft
#6	55 A	65 A	75 A	0.25 in	0.05 in²	0.064 Ω	0.490 Ω	0.45 Ω	77 ft	133 ft	177 ft	308 ft
#4	70 A	85 A	95 A	0.32 in	0.08 in²	0.060 Ω	0.310 Ω	0.30 Ω	90 ft	155 ft	207 ft	359 ft
#3	85 A	100 A	110 A	0.35 in	0.10 in²	0.059 Ω	0.250 Ω	0.24 Ω	92 ft	160 ft	213 ft	369 ft
#2	95 A	115 A	130 A	0.38 in	0.12 in²	0.057 Ω	0.200 Ω	0.20 Ω	98 ft	170 ft	226 ft	391 ft
#1	110 A	130 A	150 A	0.45 in	0.16 in²	0.057 Ω	0.160 Ω	0.17 Ω	104 ft	181 ft	241 ft	417 ft
#1/0	125 A	150 A	170 A	0.49 in	0.19 in²	0.055 Ω	0.120 Ω	0.13 Ω	115 ft	199 ft	264 ft	458 ft
#2/0	145 A	175 A	195 A	0.53 in	0.22 in²	0.054 Ω	0.100 Ω	0.11 Ω	113 ft	196 ft	262 ft	453 ft
#3/0	165 A	200 A	225 A	0.58 in	0.27 in²	0.052 Ω	0.079 Ω	0.09 Ω	119 ft	206 ft	275 ft	476 ft
#4/0	195 A	230 A	260 A	0.64 in	0.32 in²	0.051 Ω	0.063 Ω	0.08 Ω	122 ft	211 ft	281 ft	487 ft
#250	215 A	255 A	290 A	0.71 in	0.40 in²	0.052 Ω	0.054 Ω	0.07 Ω	120 ft	209 ft	278 ft	482 ft
#300	240 A	285 A	320 A	0.77 in	0.46 in²	0.051 Ω	0.045 Ω	0.07 Ω	121 ft	210 ft	280 ft	485 ft
#350	260 A	310 A	350 A	0.82 in	0.52 in²	0.050 Ω	0.039 Ω	0.06 Ω	122 ft	211 ft	282 ft	488 ft
#400	280 A	335 A	380 A	0.86 in	0.59 in²	0.049 Ω	0.035 Ω	0.06 Ω	121 ft	210 ft	279 ft	484 ft
#500	320 A	380 A	430 A	0.95 in	0.71 in²	0.048 Ω	0.029 Ω	0.05 Ω	119 ft	206 ft	274 ft	474 ft
#600	355 A	420 A	475 A	1.05 in	0.87 in²	0.048 Ω	0.025 Ω	0.05 Ω	115 ft	200 ft	266 ft	460 ft
#700	385 A	460 A	520 A	1.12 in	0.99 in²	0.048 Ω	0.023 Ω	0.04 Ω	109 ft	189 ft	252 ft	436 ft
#750	400 A	475 A	535 A	1.16 in	1.05 in²	0.048 Ω	0.021 Ω	0.04 Ω	110 ft	190 ft	253 ft	439 ft
#800	410 A	490 A	555 A	1.19 in	1.11 in²	0.047 Ω	0.020 Ω	0.04 Ω	110 ft	191 ft	254 ft	440 ft
#900	435 A	520 A	585 A	1.25 in	1.23 in²	0.047 Ω	0.019 Ω	0.04 Ω	106 ft	183 ft	244 ft	423 ft
#1000	455 A	545 A	615 A	1.31 in	1.35 in²	0.046 Ω	0.018 Ω	0.04 Ω	104 ft	181 ft	241 ft	418 ft

Notes:

Impedance is calculated utilizing a 0.85 power factor.
Maximum Length is based on 3% of the voltage value given and a power load that is 80% of the 75°C allowable ampacity.

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No guarantees are made as to the accuracy of the calculation or compliance with local codes. Verify all calculations with a professional engineer. If you find an error, or have a suggestion, please send us an email.