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310.60 ARTICLE 310 — CONDUCTORS FOR GENERAL WIRING

Table 310.15(B)(16) (formerly Table 310.16) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts,
60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth
(Directly Buried), Based on Ambient Temperature of 30°C (86°F)*

Temperature Rating of Conductor [See Table 310.104(A).]

60°C (140°F) 75°C (167°F) 90°C (194°F) 60°C (140°F) 75°C (167°F) 90°C (194°F)
Types TBS, SA,
SIS, FEP,
FEPB, MI, Types TBS, SA,
RHH, RHW-2, SIS, THHN,
THHN, THHW,
THHW, THW-2,
Types RHW, THW-2, THWN-2,
THHW, THW, THWN-2, Types RHW, RHH, RHW-2,
THWN, USE-2, XHH, THHW, THW, USE-2, XHH,
XHHW, USE, XHHW, THWN, XHHW,
Types TW, UF ZW XHHW-2, ZW-2 Types TW, UF XHHW, USE XHHW-2, ZW-2
Size AWG or
kcmil COPPER ALUMINUM OR COPPER-CLAD ALUMINUM Size AWG or kcmil
18** — — 14 — — — —
16** — — 18 — — — —
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
{A067D6C0-618F-43F9-9558-D4454551A64F}
3/0
4/0
165
195
200
230
225
260
130
150
155
180
175
205
3/0
4/0
250 215 255 290 170 205 230 250
300 240 285 320 195 230 260 300
350 260 310 350 210 250 280 350
400 280 335 380 225 270 305 400
500 320 380 430 260 310 350 500
600 350 420 475 285 340 385 600
700 385 460 520 315 375 425 700
750 400 475 535 320 385 435 750
800 410 490 555 330 395 445 800
900 435 520 585 355 425 480 900
1000 455 545 615 375 445 500 1000
1250 495 590 665 405 485 545 1250
1500 525 625 705 435 520 585 1500
1750 545 650 735 455 545 615 1750
2000 555 665 750 470 560 630 2000
*Refer to 310.15(B)(2) for the ampacity correction factors where the ambient temperature is other than 30°C (86°F). Refer to 310.15(B)(3)(a) for
more than three current-carrying conductors.
**Refer to 240.4(D) for conductor overcurrent protection limitations.

70 –150 NATIONAL ELECTRICAL CODE 2017 Edition