ARTICLE 310: Conductors for General Wiring

NEC Table 310.19

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Table 310.19 Allowable Ampacities of Single-Insulated Conductors, Rated 0 Through 2000 Volts, 150°C Through 250°C (302°F Through 482°F), in Free Air, Based on Ambient Air Temperature of 40°C (104°F)

  Temperature Rating of Conductor  
Size AWG or kcmil 150°C (302°F) 200°C (392°F) 250°C (482°F) 150°C (302°F) Size AWG or kcmil
Type Z Types FEP, FEPB, PFA Types PFAH, TFE Type Z
COPPER NICKEL OR NICKEL-COATED COPPER ALUMINUM OR COPPER-CLAD ALUMINUM
14 34 36 39 14
12 43 45 54 30 12
10 55 60 73 44 10
8 76 83 93 57 8
6 96 110 117 75 6
4 120 125 148 94 4
3 143 152 166 109 3
2 160 171 191 124 2
1 186 197 215 145 1
1/0 215 229 244 169 1/0
2/0 251 260 273 198 2/0
3/0 288 297 308 227 3/0
4/0 332 346 361 260 4/0
CORRECTION FACTORS
Ambient Temp. (°C) For ambient temperatures other than 40°C (104°F), multiply the allowable ampacities shown above by the appropriate factor shown below. Ambient Temp. (°F)
41-50 0.95 0.97 0.98 0.95 105-122
51-60 0.90 0.94 0.95 0.90 123-140
61-70 0.85 0.90 0.93 0.85 141-158
71-80 0.80 0.87 0.90 0.80 159-176
81-90 0.74 0.83 0.87 0.74 177-194
91-100 0.67 0.79 0.85 0.67 195-212
101-120 0.52 0.71 0.79 0.52 213-248
121-140 0.30 0.61 0.72 0.30 249-284
141-160 0.50 0.65 285-320
161-180 0.35 0.58 321-356
181-200 0.49 357-392
201-225 0.35 393-43

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