Delta Three Phase 1342457 06-03-05 Service Manual download pdf (Page 184)

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Reference Data

Ampacities of Insulated Conductors (Based on 1996 NEC



)

Table 310-16. Allowable Ampacities of Insulated Conductors Rated 0 – 2000V, 60° – 90°C

(140° – 194°F), Not More Than Three Current-Carrying Conductors in Raceway or Cable

or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)



Reprinted by permission from NFPA 70-1996. National Electrical Code

, Copyright

1996.

National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.

† Unless otherwise speciﬁcally permitted elsewhere in this Code, the overcurrent protection for

conductor types marked with an obelisk (†) shall not exceed 15A for No. 14, 20A for No. 12 and

30A for No. 10 copper; or 15A for No. 12 and 25A for No. 10 aluminum and copper-clad aluminum

after any correction factors for ambient temperature and number of conductors have been applied.

Size Temperature Rating of Conductor. See NEC Table 310-13. Size

AWG

kcmil

60°C

(140°F)

75°C

(167°F)

90°C

(194°F)

60°C

(140°F)

75°C

(167°F)

90°C

(194°F)

AWG

kcmil

Types

TW†, UF†

Types

FEPW†,

RH†,

RHW†,

THHW†,

THW†,

THWN†,

XHHW†,

USE†,

ZW†

Types

TBS, SA,

SIS, FEP†,

FEPB†, MI,

RHH†,

RHW-2,

THHN†,

THHW†,

THW-2†,

THWN-2†,

USE-2,

XHH,

XHHW†,

XHHW-2,

ZW-2

Types

TW†, UF†

Types

RH†,

RHW†,

THHW†,

THW†,

THWN†,

XHHW†,

USE†

Types

TBS, SA,

SIS,

THHN†,

THHW†,

THW-2,

THWN-2,

RHH†,

RHW-2,

USE-2,

XHH,

XHHW,

XHHW-2,

ZW-2

Copper Aluminum or Copper-Clad

Aluminum

—

20✝

25✝

—

20✝

25✝

35✝

25†

30†

40†

—

20†

—

20†

30†

—

25†

35†

—

110

100

115

130

110

130

150

100

115

1/0

2/0

3/0

4/0

125

145

165

195

150

175

200

230

170

195

225

260

100

115

130

150

120

135

155

180

135

150

175

205

1/0

2/0

3/0

4/0

250

300

350

400

500

215

240

260

280

320

255

285

310

335

380

290

320

350

380

430

170

190

210

225

260

205

230

250

270

310

230

255

280

305

350

250

300

350

400

500

600

700

750

800

900

355

385

400

410

435

420

460

475

490

520

475

520

535

555

585

285

310

320

330

355

340

375

385

395

425

385

420

435

450

480

600

700

750

800

900

1000

1250

1500

1750

2000

455

495

520

545

560

545

590

625

650

665

615

665

705

735

750

375

405

435

455

470

445

485

520

545

560

500

545

585

615

630

1000

1250

1500

1750

2000

Correction Factors

Ambient

Temp. °C

For Ambient Temperatures Other Than 30°C (86°F), Multiply the Allowable

Ampacities Shown Above by the Appropriate Factor Shown Below

Ambient

Temp. °F

21 – 25

26 – 30

31 – 35

36 – 40

41 – 45

46 – 50

51 – 55

56 – 60

61 – 70

71 – 80

1.08

1.00

.91

.82

.71

.58

.41

—

1.05

1.00

.94

.88

.82

.75

.67

.58

.33

—

1.04

1.00

.96

.91

.87

.82

.76

.71

.58

.41

1.08

1.00

.91

.82

.71

.58

.41

—

1.05

1.00

.94

.88

.82

.75

.67

.58

.33

—

1.04

1.00

.96

.91

.87

.82

.76

.71

.58

.41

70 – 77

78 – 86

87 – 95

96 – 104

105 – 113

114 – 122

123 – 131

132 – 140

141 – 158

159 – 176

Notes to Tables 310-16, 310-18

1. 120/240V, 3-Wire, Single-Phase

Dwelling Services and Feeders. For

dwelling units, conductors, as listed

below, shall be permitted to be utilized

as 120/240V, 3-wire, single-phase

service-entrance conductors, service

lateral conductors and feeder conductors

that serve as the main power feeder to

a dwelling unit and are installed in

raceway or cable with or without an

equipment grounding conductor. For

applications of this note, the feeder

conductors to a dwelling unit shall

not be required to be larger than its

service-entrance conductors. The

grounded conductor shall be permitted

to be smaller than the ungrounded

conductors, provided the requirements

of Sections 215-2, 220-22 and 230-42

are met.

Conductor Types and Sizes RH-RHH-RHW-

THHW-THW-THWN-THHN-XHHW-USE

8. Adjustment Factors.

(a) More Than Three Current-Carrying

Conductors in a Raceway or Cable.

Where the number of current-carrying

conductors in a raceway or cable

exceeds three, the allowable ampaci-

ties shall be reduced as shown in the

following table:

Where single conductors or multicon-

ductor cables are stacked or bundled

longer than 24 in. (610 mm) without

maintaining spacing and are not

installed in raceways, the allowable

ampacity of each conductor shall be

reduced as shown in the above table.

Copper Aluminum or

Copper-Clad

Aluminum

Service or

Feeder Rating

in Amps

AWG

1/0

2/0

3/0

4/0

250 kcmil

350 kcmil

400 kcmil

AWG

1/0

2/0

3/0

4/0

250 kcmil

300 kcmil

350 kcmil

500 kcmil

600 kcmil

100

110

125

150

175

200

225

250

300

350

400

Number of Current-

Carrying Conductors

Percent of Values in

Tables as Adjusted for

Ambient Temperature

if Necessary

4 – 6

7 – 9

10 – 20

21 – 30

31 – 40

41 and above

1 2 ... 179 180 181 182 183 184 185 186 187 188

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Delta Three Phase 1342457 06-03-05 Service Manual Page 184

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