AREA OF CONDUCTOR TYPES
AREA OF CONDUCTOR TYPES
APPROXIMATE DIMENSIONS OF CONDUCTORS
Type of Conductor
Size of Conductor (AWG or kcmil)
RFH-2, FFH-2
18 16
14 12 10 8 6 4 3 2 1
1/0 2/0 3/0 4/0
RHH, RHW, RHW-2
250 300
350
400
500
600
700 750 800 900 1000
1250 1500 1750 2000
18
SF-2, SFF-2
16
14
SF-1, SFF-1
18
RFH-1, XF, XFF
18
TF, TFF, XF, XFF
16
TW, XF, XFF, THHW, THW, THW-2
14
AREA OF CONDUCTOR TYPES
Diameter (in.)
0.136 0.148
0.193 0.212 0.236 0.326 0.364 0.412 0.440 0.472 0.582
0.622 0.668 0.720 0.778
0.895 0.950 1.001 1.048 1.133 1.243
1.314 1.348 1.380 1.444 1.502
1.729 1.852 1.966 2.072
0.121 0.133 0.148
0.091
0.106
0.118
0.133
Area (in.2)
0.0145 0.0172
0.0293 0.0353 0.0437 0.0835 0.1041 0.1333 0.1521 0.1750 0.2660
0.3039 0.3505 0.4072 0.4754
0.6291 0.7088 0.7870 0.8626 1.0082 1.2135
1.3561 1.4272 1.4957 1.6377 1.7719
2.3479 2.6938 3.0357 3.3719
0.0115 0.0139 0.0172
0.0065
0.0080
0.0109
0.0139
AREA OF CONDUCTOR TYPES
AREA OF CONDUCTOR TYPES
APPROXIMATE DIMENSIONS OF CONDUCTORS
Type of Conductor
Size of Conductor (AWG or kcmil)
Diameter (in.)
Area (in.2)
TW, THHW, THW, THW-2 RHH, RHW, RHW-2
RHH, RHW, RHW-2, XF, XFF RHH, RHW, RHW-2, XF, XFF
RHH, RHW, RHW-2
TW, THW, THHW, THW-2, RHH, RHW, RHW-2
TFN, TFFN TFE, PFAH TFE, PFA, PFAH, Z
12 10 8
14
12
10
8
6 4 3 2 1
1/0 2/0 3/0 4/0
250 300 350 400 500 600
700 750 800 900 1000
1250 1500 1750 2000
18 16
1
1/0 2/0 3/0 4/0
0.152 0.176 0.236
0.163
0.182
0.206
0.266
0.304 0.352 0.380 0.412 0.492
0.532 0.578 0.630 0.688
0.765 0.820 0.871 0.918 1.003 1.113
1.184 1.218 1.250 1.314 1.372
1.539 1.662 1.776 1.882
0.084 0.096
0.422
0.462 0.508 0.560 0.618
0.0181 0.0243 0.0437
0.0209
0.0260
0.0333
0.0556
0.0726 0.0973 0.1134 0.1333 0.1901
0.2223 0.2624 0.3117 0.3718
0.4596 0.5281 0.5958 0.6619 0.7901 0.9729
1.1010 1.1652 1.2272 1.3561 1.4784
1.8602 2.1695 2.4773 2.7818
0.0055 0.0072
0.1399
0.1676 0.2027 0.2463 0.3000
Note: Type RHH, RHW, and RHW-2 conductors referenced on this page are without outer an covering.
AREA OF CONDUCTOR TYPES
APPROXIMATE DIMENSIONS OF CONDUCTORS
Type of Conductor
Size of Conductor (AWG or kcmil)
14
12
10
8
6
4
3
THHN, THWN, THWN-2
2 1
1/0 2/0 3/0 4/0
250 300
THHN, THWN, THWN-2
350 400 500 600 700 750 800 900 1000
PF, PGFF, PGF, PFF, PTF, PAF,
18
PTFF, PAFF
16
PF, PGFF, PGF, PFF, PTF, PAF,
PTFF, PAFF, TFE, FEP, PFA,
14
FEPB, PFAH
12
10
8
TFE, FEP, PFA, FEPB, PFAH
6
4
3
2
ZF, ZFF
18 16
AREA OF CONDUCTOR TYPES
Diameter (in.)
0.111 0.130 0.164 0.236 0.254 0.324 0.352 0.384 0.446
0.486 0.532 0.584 0.642
0.711 0.766
0.817 0.864 0.949 1.051 1.122 1.156 1.188 1.252 1.310
0.086 0.098
Area (in.2)
0.0097 0.0133 0.0211 0.0366 0.0507 0.0824 0.0973 0.1158 0.1562
0.1855 0.2223 0.2679 0.3237
0.3970 0.4608
0.5242 0.5863 0.7073 0.8676 0.9887 1.0496 1.1085 1.2311 1.3478
0.0058 0.0075
0.113
0.0100
0.132 0.156 0.206 0.244 0.292 0.320 0.352
0.076 0.088
0.0137 0.0191 0.0333 0.0468 0.0670 0.0804 0.0973
0.0045 0.0061
AREA OF CONDUCTOR TYPES
AREA OF CONDUCTOR TYPES
APPROXIMATE DIMENSIONS OF CONDUCTORS
Type of Conductor
Size of Conductor (AWG or kcmil)
Z, ZF, ZFF Z
XHHW, ZW, XHHW-2, XHH
XHHW, XHHW-2, XHH
KF-2, KFF-2 KF-1, KFF-1
14
12 10 8 6 4 3 2 1
14 12 10 8 6 4 3 2
1
1/0 2/0 3/0 4/0
250 300 350 400 500
600 700 750 800 900
1000 1250 1500 1750 2000
18 16 14 12 10
18 16 14 12 10
Diameter (in.)
0.103
0.122 0.156 0.196 0.234 0.282 0.330 0.362 0.402
0.133 0.152 0.176 0.236 0.274 0.322 0.350 0.382
0.442
0.482 0.528 0.580 0.638
0.705 0.760 0.811 0.858 0.943
1.053 1.124 1.158 1.190 1.254
1.312 1.479 1.602 1.716 1.822
0.063 0.075 0.090 0.109 0.133
0.057 0.069 0.084 0.103 0.127
Area (in.2)
0.0083
0.0117 0.0191 0.0302 0.0430 0.0625 0.0855 0.1029 0.1269
0.0139 0.0181 0.0243 0.0437 0.0590 0.0814 0.0962 0.1146
0.1534
0.1825 0.2190 0.2642 0.3197
0.3904 0.4536 0.5166 0.5782 0.6984
0.8709 0.9923 1.0532 1.1122 1.2351
1.3519 1.7180 2.0157 2.3127 2.6073
0.0031 0.0044 0.0064 0.0093 0.0139
0.0026 0.0037 0.0055 0.0083 0.0127
CONDUIT FILL EXAMPLES
Conduit fill is generally based on 40% of the cross-sectional area of the conduit. Sections of conduit 24" or less in length may be filled to 60%.
APPROXIMATE DIMENSIONS OF COMPACT CONDUCTORS
Size of
BARE
THHW AND THW
Conductor CONDUCTOR
CONDUCTORS
(AWG or
App. Diameter
kcmil) Diameter (in.)
(in.)
Area (in.2)
THHN CONDUCTORS
App. Diameter
(in.)
Area (in.2)
8
0.134
0.255
0.0510
--
--
6
0.169
0.290
0.0660
0.240
0.0452
4
0.213
0.335
0.0881
0.305
0.0730
2
0.268
0.390
0.1194
0.360
0.1017
1
0.299
0.465
0.1698
0.415
0.1352
1/0
0.336
0.500
0.1963
0.450
0.1590
2/0
0.376
0.545
0.2332
0.495
0.1924
3/0
0.423
0.590
0.2733
0.540
0.2290
4/0
0.475
250
0.520
0.645 0.725
0.3267 0.4128
0.595 0.670
0.2780 0.3525
300
0.570
0.775
0.4717
0.720
0.4071
350
0.616
0.820
0.5281
0.770
0.4656
400
0.659
0.865
0.5876
0.815
0.5216
500
0.736
0.940
0.6939
0.885
0.6151
600
0.813
1.050
0.8659
0.985
0.7620
700
0.877
1.110
0.9676
1.050
0.8659
750
0.908
1.150
1.0386
1.075
0.9076
XHHW CONDUCTORS
App. Diameter
(in.)
Area (in.2)
0.224 0.260 0.305 0.360 0.415 0.450 0.490 0.540 0.590 0.660 0.715 0.760 0.800 0.880 0.980 1.050 1.090
0.0394 0.0530 0.0730 0.1017 0.1352 0.1590 0.1885 0.2290 0.2733 0.3421 0.4015 0.4536 0.5026 0.6082 0.7542 0.8659 0.9331
To find the number of conductors allowed in a conduit:
1 Find the available area in square inches of the raceway.
2 Divide the available area of the conduit by the area of the conductors. Chapter 9, Table 1 of the NEC provides us with the maximum percentage of fill allowed for raceways. Chapter 9, Table 4 provides us with the area of raceways, and Chapter 9, Table 5 of the NEC gives us the area of conductors.
ex. A section of 1 in. EMT, 18" long would be allowed to contain how many 8 AWG XHHW conductors? 1 .519 (60% area of 1 in. EMT)
= 11.8 = 12, 8 AWG, XHHW conductors are allowed in this raceway 2 .0437 (area of 8 AWG XHHW)
Round up only where the fraction is .8 or larger and all of the conductors are the same size.
ex. A 1-1/4 in. rigid metal conduit 30 ft. long contains 12, 10 AWG, THWN conductors; how many 12 AWG, THHN conductors may be added?
1 .610 (40% area of 1-1/4 in. RMC) - (.0211 ? 12) (area of 10 AWG, THWN) = .3568 (remaining area)
.3568 (remaining area)
= 26.8 = 26, 12 AWG, THHN conductors are allowed in this raceway
2 .0133 (area of 12 AWG, THHN)
Note: The provision that allows the next higher number of conductors to be installed in the raceway where the calculation results in a decimal of .8 or larger may only be used where all of the conductors in the raceway are the same size.
Tables found in Annex C of the NEC can only be used where there are more than three conductors in the raceway, all of the conductors are the same size and type, and the raceway is longer than 24". (The following tables are based on 40% conduit fill.)
CONDUIT FILL EXAMPLES
40% CONDUIT FILL (EMT)
................
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