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)
[View Full Width]
[View Full Width]
[View Full Width]
[View Full Width]
[View Full Width]
[*] Corresponds to 356.2(2)
[View Full Width]
[*] Corresponds to 356.2(1)
[View Full Width]
[View Full Width]
[View Full Width]
[View Full Width]
[View Full Width]
[View Full Width]
(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 |
Approximate |
Approximate |
||
|---|---|---|---|---|---|
|
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, |
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[*], |
14 |
4.140 |
0.163 |
13.48 |
0.0209 |
|
RHH[*], RHW[*], RHW-2[*], |
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[*], |
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[*] |
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
[View Full Width]
[*] Dimensions are from industry sources.
Table 8. Conductor Properties
[View Full Width]
Table 9. Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F)Three Single Conductors in Conduit
[View Full Width]
Article 90 Introduction
General
Wiring and Protection
- Article 200 Use and Identification of Grounded Conductors
- Article 210 Branch Circuits
- Article 215 Feeders
- Article 220 Branch-Circuit, Feeder, and Service Calculations
- Article 225 Outside Branch Circuits and Feeders
- Article 230 Services
- Article 240 Overcurrent Protection
- Article 250 Grounding and Bonding
- Article 280 Surge Arresters
- Article 285 Transient Voltage Surge Suppressors (TVSSs)
Wiring Methods and Materials
- Article 300: Wiring Methods
- Article 310 Conductors for General Wiring
- Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures
- Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
- Article 320 Armored Cable Type AC
- Article 322 Flat Cable Assemblies Type FC
- Article 324 Flat Conductor Cable Type FCC
- Article 326 Integrated Gas Spacer Cable Type IGS
- Article 328 Medium-Voltage Cable Type MV
- Article 330 Metal-Clad Cable Type MC
- Article 332 Mineral-Insulated, Metal-Sheathed Cable Type MI
- Article 334 Nonmetallic-Sheathed Cable Types NM, NMC, and NMS
- Article 336 Power and Control Tray Cable Type TC
- Article 338 Service-Entrance Cable Types SE and USE
- Article 340 Underground Feeder and Branch-Circuit Cable Type UF
- Article 342 Intermediate Metal Conduit Type IMC
- Article 344 Rigid Metal Conduit Type RMC
- Article 348 Flexible Metal Conduit Type FMC
- Article 350 Liquidtight Flexible Metal Conduit Type LFMC
- Article 352 Rigid Nonmetallic Conduit Type RNC
- Article 353 High Density Polyethylene Conduit Type HDPE Conduit
- Article 354 Nonmetallic Underground Conduit with Conductors Type NUCC
- Article 356 Liquidtight Flexible Nonmetallic Conduit Type LFNC
- Article 358 Electrical Metallic Tubing Type EMT
- Article 360 Flexible Metallic Tubing Type FMT
- Article 362 Electrical Nonmetallic Tubing Type ENT
- Article 366 Auxiliary Gutters
- Article 374 Cellular Metal Floor Raceways
- Article 382 Nonmetallic Extensions
- Article 384 Strut-Type Channel Raceway
- Article 386 Surface Metal Raceways
- Article 388 Surface Nonmetallic Raceways
- Article 390 Underfloor Raceways
- Article 392 Cable Trays
- Article 394 Concealed Knob-and-Tube Wiring
- Article 396 Messenger Supported Wiring
- Article 398 Open Wiring on Insulators
Equipment for General Use
- Article 400: Flexible Cords and Cables
- Article 402: Fixture Wires
- Article 404: Switches
- Article 406: Receptacles, Cord Connectors, and Attachment Plugs (Caps)
- Article 408: Switchboards and Panelboards
- Article 409: Industrial Control Panels
- Article 410: Luminaires (Lighting Fixtures), Lampholders, and Lamps
- Article 411: Lighting Systems Operating at 30 Volts or Less
- Article 422: Appliances
- Article 424: Fixed Electric Space Heating Equipment
- Article 426: Fixed Outdoor Electric De-Icing and Snow-Melting Equipment
- Article 427: Fixed Electric Heating Equipment for Pipelines and Vessels
- Article 430: Motors, Motor Circuits, and Controllers
- Article 440: Air Conditioning and Refrigerating Equipment
Special Occupancies
- Article 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2
- Article 501 Class I Locations
- Article 502 Class II Locations
- Article 503 Class III Locations
- Article 504 Intrinsically Safe Systems
Special Equipment
Special Conditions
- Article 700 Emergency Systems
- Article 701 Legally Required Standby Systems
- Article 702 Optional Standby Systems
Tables
- Tables
- Notes to Tables
- Tables 11(A) and 11(B)
- Notes for Tables 11(A) and 11(B)
- Tables 12(A) and 12(B)
- Notes for Tables 12(A) and 12(B)
Annex C. Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size
Annex D. Examples
- Annex D. Examples
- Example No. D1(a) One-Family Dwelling
- Example No. D1(b) One-Family Dwelling
- Example No. D2(a) Optional Calculation for One-Family Dwelling Heating Larger than Air Conditioning [See Section 220.82]
- Example No. D2(b) Optional Calculation for One-Family Dwelling, Air Conditioning Larger than Heating [See 220.82(A) and 220.82(C)]
- Example No. D2(c) Optional Calculation for One-Family Dwelling with Heat Pump(Single-Phase, 240/120-Volt Service) (See 220.82)
- Example No. D3 Store Building
- Example D3(a) Industrial Feeders in a Common Raceway
- Example No. D4(a) Multifamily Dwelling
- Example No. D4(b) Optional Calculation for Multifamily Dwelling
- Example No. D5(a) Multifamily Dwelling Served at 208Y/120 Volts, Three Phase
- Example No. D5(b) Optional Calculation for Multifamily Dwelling Served at 208Y/120 Volts, Three Phase
- Example No. D6 Maximum Demand for Range Loads
- Example No. D8 Motor Circuit Conductors, Overload Protection, and Short-Circuit and Ground-Fault Protection
- Example No. D9 Feeder Ampacity Determination for Generator Field Control
- Example No. D10 Feeder Ampacity Determination for Adjustable-Speed Drive Control [See 215.2, 430.24, 620.13, 620.14, 620.61, Tables 430.22(E), and 620.14]
- Example No. D11 Mobile Home (See 550.18)
- Example No. D12 Park Trailer (See 552.47)
Annex E. Types of Construction
EAN: 2147483647
Pages: 120
