Notes to Tables
(1) See Appendix C for the maximum number of conductors and fixture wires, all of the same size (total cross-sectional area including insulation) permitted in trade sizes of the applicable conduit or tubing.
(2) Table 1 applies only to complete conduit or tubing systems and is not intended to apply to sections of conduit or tubing used to protect exposed wiring from physical damage.
(3) Equipment grounding or bonding conductors, where installed, shall be included when calculating conduit or tubing fill. The actual dimensions of the equipment grounding or bonding conductor (insulated or bare) shall be used in the calculation.
(4) Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 inches) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and Section 310.15(B)(2)(a) need not apply to this condition.
(5) For conductors not included in Chapter 9, such as multi-conductor cables, the actual dimensions shall be used.
(6) For combinations of conductors of different sizes, use Tables 5 and 5A for dimensions of conductors and Table 4 for the applicable conduit or tubing dimensions.
Table 4. Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9)
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[*] Corresponds to 356.2(2)
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[*] Corresponds to 356.2(1)
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(7) When calculating the maximum number of conductors permitted in a conduit or tubing, all of the same size (total cross-sectional area including insulation), the next higher whole number shall be used to determine the maximum number of conductors permitted when the calculation results in a decimal of 0.8 or larger.
(8) Where bare conductors are permitted by other sections of this Code, the dimensions for bare conductors in Table 8 shall be permitted.
(9) A multiconductor cable of two or more conductors shall be treated as a single conductor for calculating percentage conduit fill area. For cables that have elliptical cross sections, the cross-sectional area calculation shall be based on using the major diameter of the ellipse as a circle diameter.
|
Conduit (Size) |
One Shot and Full Shoe Benders |
Other Bends |
|||
|---|---|---|---|---|---|
|
Metric Designator |
Trade Size |
mm |
in. |
mm |
in. |
|
16 |
½ |
101.6 |
4 |
101.6 |
4 |
|
21 |
¾ |
114.3 |
4½ |
127 |
5 |
|
27 |
1 |
146.05 |
5¾ |
152.4 |
6 |
|
35 |
1¼ |
184.15 |
7¼ |
203.2 |
8 |
|
41 |
1½ |
209.55 |
8¼ |
254 |
10 |
|
53 |
2 |
241.3 |
9½ |
304.8 |
12 |
|
63 |
2½ |
266.7 |
10½ |
381 |
15 |
|
78 |
3 |
330.2 |
13 |
457.2 |
18 |
|
91 |
3½ |
381 |
15 |
533.4 |
21 |
|
103 |
4 |
406.4 |
16 |
609.6 |
24 |
|
129 |
5 |
609.6 |
24 |
762 |
30 |
|
155 |
6 |
762 |
30 |
914.4 |
36 |
|
Type |
Size (AWG or kcmil) |
Approximate Diameter |
Approximate Area |
||
|---|---|---|---|---|---|
|
mm |
in. |
mm2 |
in.2 |
||
|
Type: FFH-2, RFH-1, RFH-2, RHH[*] , RHW[*], RHW-2[*], RHH, RHW, RHW-2, |
|||||
|
SF-1, SF-2, SFF-1, SFF-2, TF, TFF, THHW, THW, THW-2, TW, XF, XFF |
|||||
|
RFH-2, |
18 |
3.454 |
0.136 |
9.355 |
0.0145 |
|
FFH-2 |
16 |
3.759 |
0.148 |
11.10 |
0.0172 |
|
RHW-2, RHH, |
14 |
4.902 |
0.193 |
18.90 |
0.0293 |
|
RHW |
12 |
5.385 |
0.212 |
22.77 |
0.0353 |
|
10 |
5.994 |
0.236 |
28.19 |
0.0437 |
|
|
8 |
8.280 |
0.326 |
53.87 |
0.0835 |
|
|
6 |
9.246 |
0.364 |
67.16 |
0.1041 |
|
|
4 |
10.46 |
0.412 |
86.00 |
0.1333 |
|
|
3 |
11.18 |
0.440 |
98.13 |
0.1521 |
|
|
2 |
11.99 |
0.472 |
112.9 |
0.1750 |
|
|
1 |
14.78 |
0.582 |
171.6 |
0.2660 |
|
|
1/0 |
15.80 |
0.622 |
196.1 |
0.3039 |
|
|
2/0 |
16.97 |
0.668 |
226.1 |
0.3505 |
|
|
3/0 |
18.29 |
0.720 |
262.7 |
0.4072 |
|
|
4/0 |
19.76 |
0.778 |
306.7 |
0.4754 |
|
|
250 |
22.73 |
0.895 |
405.9 |
0.6291 |
|
|
300 |
24.13 |
0.950 |
457.3 |
0.7088 |
|
|
350 |
25.43 |
1.001 |
507.7 |
0.7870 |
|
|
400 |
26.62 |
1.048 |
556.5 |
0.8626 |
|
|
500 |
28.78 |
1.133 |
650.5 |
1.0082 |
|
|
600 |
31.57 |
1.243 |
782.9 |
1.2135 |
|
|
700 |
33.38 |
1.314 |
874.9 |
1.3561 |
|
|
750 |
34.24 |
1.348 |
920.8 |
1.4272 |
|
|
800 |
35.05 |
1.380 |
965.0 |
1.4957 |
|
|
900 |
36.68 |
1.444 |
1057 |
1.6377 |
|
|
1000 |
38.15 |
1.502 |
1143 |
1.7719 |
|
|
1250 |
43.92 |
1.729 |
1515 |
2.3479 |
|
|
1500 |
47.04 |
1.852 |
1738 |
2.6938 |
|
|
1750 |
49.94 |
1.966 |
1959 |
3.0357 |
|
|
2000 |
52.63 |
2.072 |
2175 |
3.3719 |
|
|
SF-2, SFF-2 |
18 |
3.073 |
0.121 |
7.419 |
0.0115 |
|
16 |
3.378 |
0.133 |
8.968 |
0.0139 |
|
|
14 |
3.759 |
0.148 |
11.10 |
0.0172 |
|
|
SF-1, SFF-1 |
18 |
2.311 |
0.091 |
4.194 |
0.0065 |
|
RFH-1, XF, XFF |
18 |
2.692 |
0.106 |
5.161 |
0.0080 |
|
TF, TFF, XF, XFF |
16 |
2.997 |
0.118 |
7.032 |
0.0109 |
|
TW, XF, XFF, THHW, THW, THW-2 |
14 |
3.378 |
0.133 |
8.968 |
0.0139 |
|
TW, THHW, THW, |
12 |
3.861 |
0.152 |
11.68 |
0.0181 |
|
THW-2 |
10 |
4.470 |
0.176 |
15.68 |
0.0243 |
|
8 |
5.994 |
0.236 |
28.19 |
0.0437 |
|
|
RHH[*], RHW[*], RHW-2[*] |
14 |
4.140 |
0.163 |
13.48 |
0.0209 |
|
RHH[*], RHW[*], RHW-2[*], XF, XFF |
12 |
4.623 |
0.182 |
16.77 |
0.0260 |
|
Type RRH[*], RHW[*], RHW-2[*], THHN, THHW, THW, THW-2, TFN, |
|||||
|
TFFN, THWN, THWN-2, XF, XFF |
|||||
|
RHH[*], RHW[*], RHW-2[*], XF, XFF |
10 |
5.232 |
0.206 |
21.48 |
0.0333 |
|
RHH[*], RHW[*], RHW-2 |
8 |
6.756 |
0.266 |
35.87 |
0.0556 |
|
TW, THW, |
6 |
7.722 |
0.304 |
46.84 |
0.0726 |
|
THHW, |
4 |
8.941 |
0.352 |
62.77 |
0.0973 |
|
THW-2 |
3 |
9.652 |
0.380 |
73.16 |
0.1134 |
|
RHH[*], |
2 |
10.46 |
0.412 |
86.00 |
0.1333 |
|
RHW[*] RHW-2[*] |
1 |
12.50 |
0.492 |
122.6 |
0.1901 |
|
1/0 |
13.51 |
0.532 |
143.4 |
0.2223 |
|
|
2/0 |
14.68 |
0.578 |
169.3 |
0.2624 |
|
|
3/0 |
16.00 |
0.630 |
201.1 |
0.3117 |
|
|
4/0 |
17.48 |
0.688 |
239.9 |
0.3718 |
|
|
250 |
19.43 |
0.765 |
296.5 |
0.4596 |
|
|
300 |
20.83 |
0.820 |
340.7 |
0.5281 |
|
|
350 |
22.12 |
0.871 |
384.4 |
0.5958 |
|
|
400 |
23.32 |
0.918 |
427.0 |
0.6619 |
|
|
500 |
25.48 |
1.003 |
509.7 |
0.7901 |
|
|
600 |
28.27 |
1.113 |
627.7 |
0.9729 |
|
|
700 |
30.07 |
1.184 |
710.3 |
1.1010 |
|
|
750 |
30.94 |
1.218 |
751.7 |
1.1652 |
|
|
800 |
31.75 |
1.250 |
791.7 |
1.2272 |
|
|
900 |
33.38 |
1.314 |
874.9 |
1.3561 |
|
|
1000 |
34.85 |
1.372 |
953.8 |
1.4784 |
|
|
1250 |
39.09 |
1.539 |
1200 |
1.8602 |
|
|
1500 |
42.21 |
1.662 |
1400 |
2.1695 |
|
|
1750 |
45.11 |
1.776 |
1598 |
2.4773 |
|
|
2000 |
47.80 |
1.882 |
1795 |
2.7818 |
|
|
TFN, |
18 |
2.134 |
0.084 |
3.548 |
0.0055 |
|
TFFN |
16 |
2.438 |
0.096 |
4.645 |
0.0072 |
|
THHN, |
14 |
2.819 |
0.111 |
6.258 |
0.0097 |
|
THWN, |
12 |
3.302 |
0.130 |
8.581 |
0.0133 |
|
THWN-2 |
10 |
4.166 |
0.164 |
13.61 |
0.0211 |
|
8 |
5.486 |
0.216 |
23.61 |
0.0366 |
|
|
6 |
6.452 |
0.254 |
32.71 |
0.0507 |
|
|
4 |
8.230 |
0.324 |
53.16 |
0.0824 |
|
|
3 |
8.941 |
0.352 |
62.77 |
0.0973 |
|
|
2 |
9.754 |
0.384 |
74.71 |
0.1158 |
|
|
1 |
11.33 |
0.446 |
100.8 |
0.1562 |
|
|
1/0 |
12.34 |
0.486 |
119.7 |
0.1855 |
|
|
2/0 |
13.51 |
0.532 |
143.4 |
0.2223 |
|
|
THHN, THWN, |
3/0 |
14.83 |
0.584 |
172.8 |
0.2679 |
|
THWN-2 |
4/0 |
16.31 |
0.642 |
208.8 |
0.3237 |
|
250 |
18.06 |
0.711 |
256.1 |
0.3970 |
|
|
300 |
19.46 |
0.766 |
297.3 |
0.4608 |
|
|
Type: FEP, FEPB, PAF, PAFF, PF, PFA, PFAH, PFF, PGF, PGFF, PTF, PTFF, |
|||||
|
TFE, THHN, THWN, THWN-2, Z, ZF, ZFF |
|||||
|
THHN, |
350 |
20.75 |
0.817 |
338.2 |
0.5242 |
|
THWN, |
400 |
21.95 |
0.864 |
378.3 |
0.5863 |
|
THWN-2 |
500 |
24.10 |
0.949 |
456.3 |
0.7073 |
|
600 |
26.70 |
1.051 |
559.7 |
0.8676 |
|
|
700 |
28.50 |
1.122 |
637.9 |
0.9887 |
|
|
750 |
29.36 |
1.156 |
677.2 |
1.0496 |
|
|
800 |
30.18 |
1.188 |
715.2 |
1.1085 |
|
|
900 |
31.80 |
1.252 |
794.3 |
1.2311 |
|
|
1000 |
33.27 |
1.310 |
869.5 |
1.3478 |
|
|
PF, PGFF, PGF, PFF, |
18 |
2.184 |
0.086 |
3.742 |
0.0058 |
|
PTF, PAF, PTFF, |
16 |
2.489 |
0.098 |
4.839 |
0.0075 |
|
PAFF |
|||||
|
PF, PGFF, PGF, PFF, |
14 |
2.870 |
0.113 |
6.452 |
0.0100 |
|
PTF, PAF, PTFF, PAFF, TFE, FEP, PFA, FEPB, PFAH |
|||||
|
TFE, FEP, |
12 |
3.353 |
0.132 |
8.839 |
0.0137 |
|
PFA, FEPB, |
10 |
3.962 |
0.156 |
12.32 |
0.0191 |
|
PFAH |
8 |
5.232 |
0.206 |
21.48 |
0.0333 |
|
6 |
6.198 |
0.244 |
30.19 |
0.0468 |
|
|
4 |
7.417 |
0.292 |
43.23 |
0.0670 |
|
|
3 |
8.128 |
0.320 |
51.87 |
0.0804 |
|
|
2 |
8.941 |
0.352 |
62.77 |
0.0973 |
|
|
TFE, PFAH |
1 |
10.72 |
0.422 |
90.26 |
0.1399 |
|
TFE, PFA |
1/0 |
11.73 |
0.462 |
108.1 |
0.1676 |
|
PFAH, Z |
2/0 |
12.90 |
0.508 |
130.8 |
0.2027 |
|
3/0 |
14.22 |
0.560 |
158.9 |
0.2463 |
|
|
4/0 |
15.70 |
0.618 |
193.5 |
0.3000 |
|
|
ZF, ZFF |
18 |
1.930 |
0.076 |
2.903 |
0.0045 |
|
16 |
2.235 |
0.088 |
3.935 |
0.0061 |
|
|
Z, ZF, ZFF |
14 |
2.616 |
0.103 |
5.355 |
0.0083 |
|
Z |
12 |
3.099 |
0.122 |
7.548 |
0.0117 |
|
10 |
3.962 |
0.156 |
12.32 |
0.0191 |
|
|
8 |
4.978 |
0.196 |
19.48 |
0.0302 |
|
|
6 |
5.944 |
0.234 |
27.74 |
0.0430 |
|
|
4 |
7.163 |
0.282 |
40.32 |
0.0625 |
|
|
3 |
8.382 |
0.330 |
55.16 |
0.0855 |
|
|
2 |
9.195 |
0.362 |
66.39 |
0.1029 |
|
|
1 |
10.21 |
0.402 |
81.87 |
0.1269 |
|
|
Type: KF-1, KF-2, KFF-1, KFF-2, XHH, XHHW, XHHW-2, ZW |
|||||
|
XHHW, ZW, |
14 |
3.378 |
0.133 |
8.968 |
0.0139 |
|
XHHW-2, |
12 |
3.861 |
0.152 |
11.68 |
0.0181 |
|
XHH |
10 |
4.470 |
0.176 |
15.68 |
0.0243 |
|
8 |
5.994 |
0.236 |
28.19 |
0.0437 |
|
|
6 |
6.960 |
0.274 |
38.06 |
0.0590 |
|
|
4 |
8.179 |
0.322 |
52.52 |
0.0814 |
|
|
3 |
8.890 |
0.350 |
62.06 |
0.0962 |
|
|
2 |
9.703 |
0.382 |
73.94 |
0.1146 |
|
|
XHHW, |
1 |
11.23 |
0.442 |
98.97 |
0.1534 |
|
XHHW-2, |
1/0 |
12.24 |
0.482 |
117.7 |
0.1825 |
|
XHH |
2/0 |
13.41 |
0.528 |
141.3 |
0.2190 |
|
3/0 |
14.73 |
0.58 |
170.5 |
0.2642 |
|
|
4/0 |
16.21 |
0.638 |
206.3 |
0.3197 |
|
|
250 |
17.91 |
0.705 |
251.9 |
0.3904 |
|
|
300 |
19.30 |
0.76 |
292.6 |
0.4536 |
|
|
350 |
20.60 |
0.811 |
333.3 |
0.5166 |
|
|
400 |
21.79 |
0.858 |
373.0 |
0.5782 |
|
|
500 |
23.95 |
0.943 |
450.6 |
0.6984 |
|
|
600 |
26.75 |
1.053 |
561.9 |
0.8709 |
|
|
700 |
28.55 |
1.124 |
640.2 |
0.9923 |
|
|
750 |
29.41 |
1.158 |
679.5 |
1.0532 |
|
|
800 |
30.23 |
1.190 |
717.5 |
1.1122 |
|
|
900 |
31.85 |
1.254 |
796.8 |
1.2351 |
|
|
1000 |
33.32 |
1.312 |
872.2 |
1.3519 |
|
|
1250 |
37.57 |
1.479 |
1108 |
1.7180 |
|
|
1500 |
40.69 |
1.602 |
1300 |
2.0157 |
|
|
1750 |
43.59 |
1.716 |
1492 |
2.3127 |
|
|
2000 |
46.28 |
1.822 |
1682 |
2.6073 |
|
|
KF-2, |
18 |
1.600 |
0.063 |
2.000 |
0.0031 |
|
KFF-2 |
16 |
1.905 |
0.075 |
2.839 |
0.0044 |
|
14 |
2.286 |
0.090 |
4.129 |
0.0064 |
|
|
12 |
2.769 |
0.109 |
6.000 |
0.0093 |
|
|
10 |
3.378 |
0.133 |
8.968 |
0.0139 |
|
|
KF-1, |
18 |
1.448 |
0.057 |
1.677 |
0.0026 |
|
KFF-1 |
16 |
1.753 |
0.069 |
2.387 |
0.0037 |
|
14 |
2.134 |
0.084 |
3.548 |
0.0055 |
|
|
12 |
2.616 |
0.103 |
5.355 |
0.0083 |
|
|
10 |
3.226 |
0.127 |
8.194 |
0.0127 |
|
[*] Types RHH, RHW and RHW-2 without outer covering.
Table 5A. Compact Aluminum Building Wire Nominal Dimensions[*] and Areas
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[*] Dimensions are from industry sources.
Table 8. Conductor Properties
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Table 9. Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F)Three Single Conductors in Conduit
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