Cables

Allowable Ampacities of Conductors: Free Air

Size 60°C (140°F) 75°C (167°F) 90°C (194°F) 60°C (140°F) 75°C (167°F) 90°C (194°F) Size
AWG or kcmil Type TW, UF Types RHW, THHW, THW, THWN, XHHW, XHHW, USE, ZW Types TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 Type TW, UF Types RHW, THHW, THW, THWN, XHHW, USE Types TBS, SA, SIS, THHN, THHW, THW-2, THWN-2, THH, THW-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 AWG or kcmil
copper Copper Copper Copper Aluminum or Copper-Clad Aluminum Aluminum or Copper-Clad Aluminum Aluminum or Copper-Clad Aluminum Aluminum or Copper-Clad Aluminum
14** 15 20 25 --- --- --- ---
12** 20 25 30 15 20 25 12**
10** 30 35 40 25 30 35 10**
8 40 50 55 35 40 45 8
6 55 65 75 40 50 55 6
4 70 85 95 55 65 75 4
3 85 100 115 65 75 85 3
2 95 115 130 75 90 100 2
1 110 130 145 85 100 115 1
1/0 125 150 170 100 120 135 1/0
2/0 145 175 195 115 135 150 2/0
3/0 165 200 225 130 155 175 3/0
4/0 195 230 260 150 180 205 4/0
250 215 255 290 170 205 230 250
300 240 285 320 195 230 260 300

To get more information about cable sizing review the NEC standards or the NFPA 70 standards