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.

Table 2. Radius of Conduit and Tubing Bends

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

127

5

27

1

146.05

152.4

6

35

184.15

203.2

8

41

209.55

254

10

53

2

241.3

304.8

12

63

266.7

10½

381

15

78

3

330.2

13

457.2

18

91

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

Table 5. Dimensions of Insulated Conductors and Fixture Wires

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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Pocket Guide to the National Electrical Code 2005
Pocket Guide to the National Electrical Code(R), 2005 Edition (8th Edition)
ISBN: 0131480014
EAN: 2147483647
Year: 2004
Pages: 120
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