ARTICLE 310: CONDUCTORS FOR GENERAL WIRING NEC TABLE … · 220 260 300 350 405 455 500 570 615 700...

Technical Reference

217800.HOU.WIRE

www.houwire.com2012 Product Catalog. All data subject to change without notice.

Table 310.15(B)(3)(a) Adjustment Factors for More Than Three Current-Carrying Conductors in a Raceway or Cable

ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLE 310.15(B)(3)(a)

Percent of Values inTables 310.15(B)(16)

through 310.19(B)(19) as Adjusted for Ambient

Temperature if Necessary

807050454035

Number of Current-Carrying

Conductors

4-67-9

10-2021-3031-40

41 and above

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218800.HOU.WIREwww.houwire.com2012 Product Catalog. All data subject to change without notice.

ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLE 310.15(B)(16)

Table 310.15(B)(16) (formerly Table 310.16) Allowable Ampacities of Insulated Conductors Rated up to and Including 2000 Volts, 60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)*

* Refer to 310.15(B)(2) for the ampacity correction factors where the ambient temperature is other than 30°C (86°F).** Refer to 240.4(D) for the conductor overcurrent protection limitations.

Size AWG or kcmil

Size AWG or kcmil

60°C(140°F)

Types TW, UF Types TW, UFTypes RHW, THHW, THW, THWN, XHHW,

USE, ZW

Types RHW, THHW, THW, THWN, XHHW,

USE, ZW

TypesTBS, SA, SIS, FEP, FEPB, MI, RHH,

RHW-2, THHN, THHW, THW-2, THWN-2,

USE-2, XHH, XHHW, XHHW-2, ZW-2




60°C(140°F)

75°C(167°F)

75°C(167°F)

90°C(194°F)

90°C(194°F)

COPPER ALUMINUM OR COPPER-CLAD ALUMINUM

Temperature Rating of Conductor [See Table 310.104(A), NEC2011]

––

1520304055708595110125145165195215240260280320350385400410435455495525545555

––

2025355065

852100115130150175200230255285310335380420460475490520545590625650665

1418253040557595115130145170195225260290320350380430475520535555585615665705735750

–––

1525354055657585

100115130150170195210225260285315320330355375405435455470

–––

20304050657590

100120135155180205230250270310340375385395425445485520545560

–––

253545557585

100115135150175205230260280305350385425435445480500545585615630

–––

12**10**

864321

1/02/03/04/0250300350400500600700750800900

10001250150017502000

1816

14**12**10**

864321

1/02/03/04/0250300350400500600700750800900

10001250150075002000

Technical Reference

219800.HOU.WIRE



Table 310.15(B)(17) (formerly Table 310.17) Allowable Ampacities of Single-Insulated Conductors Rated up to and Including 2000 Volts in Free Air, Based on Ambient Air Temperature of 30°C (86°F)*

* Refer to 310.15(B)(2) for the ampacity correction factors where the ambient temperature is other than 30°C (86°F).** Refer to 240.4(D) for the conductor overcurrent protection limitations.

––

2530406080

105120140165195225260300340375420455515575630655680730780890980

10701155

––

3035507095

125145170195230265310360405445505545620690755785815870935

1065117512801385

182435405580

105140165190220260300350405455500570615700780850885920980

10551200132514451560

–––

253545608095110130150175200235265290330355405455500515535580625710795875960

–––

3040557510115135155180210240280315350395425485545595620645700750855950

10501150

–––

35456085115130150175205235270315355395445480545615670700725790845965

107011851295

–––

12**10**

864321

1/02/03/04/0250300350400500600700750800900

10001250150017502000

Size AWG or kcmil

60°C(140°F)

Types TW, UF Types TW, UFTypes RHW, THHW, THW, THWN, XHHW,

USE, ZW

Types RHW, THHW, THW, THWN, XHHW,

USE, ZW







60°C(140°F)

75°C(167°F)

75°C(167°F)

90°C(194°F)

90°C(194°F)

COPPER ALUMINUM OR COPPER-CLAD ALUMINUM


Size AWG or kcmil

1816

14**12**10**

864321

1/02/03/04/0250300350400500600700750800900

10001250150075002000

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Table 310.15(B)(18) (formerly Table 310.18) Allowable Ampacities of Insulated Conductors Rated up to and Including 2000 Volts, 150°C Through 250°C (302°F Through 482°F). Not More Than Three Current-Carrying Conductors in Raceway or Cable, Based on Ambient Air Temperature of 40°C (104°F)*

141210864321

1/02/03/04/0

3443557696

120143160186215251288332

36456083110125152171197229260297346

39547393117148166191215244273308361

–3044577594

109124145169198227260

141210864321

1/02/03/04/0

250°C (482°F)150°C (302°F) 150°C (302°F)200°C (392°F)

Type ZTypes FEP,

FEPB, PFA, SATypes PFAH, TFE Type Z


COPPERNICKEL OR

NICKEL-COATED COPPER

ALUMINUM OR COPPER-CLAD

ALUMINUM

*Refer to 310.15(15)(B)(2) for the ampacity correction factors where the ambient temperature is other than 40°C (104°F)

Size AWG or kcmil

Size AWG or kcmil

Technical Reference

221800.HOU.WIRE



Table 310.15(B)(19) (formerly Table 310.19) Allowable Ampacities of Insulated Conductors Rated up to and Including 2000 Volts, 150°C Through 250°C (302°F Through 482°F),in Free Air, Based on Ambient Air Temperature of 40°C (104°F)*


141210864321

1/02/03/04/0

456080

106155190214255293339390451529

546890

124165220252293344399467546629

5978

107142205278327381440532591708830

–476383112148170198228263305351411

141210864321

1/02/03/04/0

250°C (482°F)150°C (302°F) 150°C (302°F)200°C (392°F)

Size AWG or kcmil

Size AWG or kcmilType Z

Types FEP, FEPB, PFA, SA

Types PFAH, TFE Type Z


COPPERNICKEL OR



ALUMINUM

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Table 310.15(B)(20) (formerly Table 310.20) Ampacities of Not More Than Three Single Insulated Conductors Rated up to and Including 2000 Volts, Supported on a Messenger, Based on Ambient Air Temperature of 40°C (104°F)*


864321

1/02/03/04/0250300350400500600700750800900

1000

5776

101118135158183212245287320359397430496553610638660704748

6689117138158185214247287335374419464503580647714747773826879

44597892

106123143165192224251282312339392440488512532572612

516991

107123144167193224262292328364395458514570598622669716

864321

1/02/03/04/0250300350400500600700750800900

1000

250°C (482°F)150°C (302°F) 150°C (302°F)200°C (392°F)

Type ZTypes FEP,

FEPB, PFA, SATypes PFAH, TFE Type Z


Size AWG or kcmil

Size AWG or kcmil

COPPERNICKEL OR



ALUMINUM

Technical Reference

223800.HOU.WIRE


ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLE 310.21

Table 310.15(B)(21) (formerly Table 310.21) Ampacities of Bare or Covered Conductors in Free Air, Based on 40°C (104°F) Ambient, 80°C (176°F) Total Conductor Temperature, 610 mm/sec (2ft/sec) Wind Velocity

8642

1/02/03/04/0250300500750

1000

98124155209282329382444494556773

10001193

8642

1/02/03/04/0250300500750

1000

103130163219297344401466519584812

10501253

Copper Conductors

Bare Covered

AWG or kcmil Amperes AWG or kcmil Amperes

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ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC FIGURE 310.60

Figure 310.60. Cable installation dimensions for use with Tables 310.60(C)(77) through 310.60(C)(86).

Detail 1290 mm x 290 mm(11.5 in. x 11.5 in.)Electrical duct bankOne electrical duct

Detail 2475 mm x 475 mm(19 in. x 19 in.)Electrical duct bankThree electrical ducts

OR

Detail 4675 mm x 675 mm(27 in. x 27 in.)Electrical duct bankNine electrical ducts

Detail 3475 mm x 675 mm(19 in. x 27 in.)Electrical duct bankSix electrical ducts

OR

190 mm (7.5 in.) 190 mm 190 mm(7.5 in.) (7.5 in.)

190 mm (7.5 in.)

190

mm

(7.5

in.)

190

mm

190

mm

(7.5

in.)

(7.5

in.)

190

mm

190

mm

(7.5

in.)

(7.5

in.)

675 mm x 290 mm(27 in. x 11.5 in.)Electrical duct bankThree electrical ducts

675 mm x 475 mm(27 in. x 19 in.)Electrical duct bankSix electrical ducts

Detail 5Buried 3conductorcable

Detail 6Buried 3conductorcable

600 mm (24 in.)

Detail 7Buried triplex cables (1 circuit)

Detail 8Buried triplex cables (2 circuits)

Detail 9Buried single-conductorcables (1 circuit)

600 mm (24 in.)

Detail 10Buried single-conductorcables (2 circuits)

190 mm (7.5 in.)

190 mm(7.5 in.)

190

mm

190 mm 190 mm(7.5 in.) (7.5 in.)

600 mm (24 in.)

190 mm 190 mm(7.5 in.) (7.5 in.)

190 mm 190 mm(7.5 in.) (7.5 in.)

190 mm 190 mm(7.5 in.) (7.5 in.)

LEGEND

Backfill (earth or concrete)

Electrical Duct

Cable or Cables

Note: Minimum burial depths to top electrical ducts or cables shall be in accordance with 300.50. Maximum depth to the top of electrical duct banks shall be 750 mm (30 in.) and maximum depth to the top of direct buried cables shall be 900 mm (36 in.)

Technical Reference

225800.HOU.WIRE


1 100 Percent Insulation Level. Cables in this category shall be permitted to be applied where the system is provided with relay protection such that ground faults will be cleared as rapidly as possible but, in any case, within 1 minute. While these cables are applicable to the great majority of cable installations that are on grounded systems, they shall be permitted to be used also on other systems for which the application of cables is acceptable, provided the above clearing requirements are met in completely de-energizing the faulted section.2 133 Percent Insulation Level. This insulation level corresponds to that formerly designated for ungrounded systems. Cables in this category shall be permitted to be applied in situations where the clearing time requirements of the 100 percent level category cannot be met and yet there is adequate assurance that the faulted section will be de-energized in a time not exceeding 1 hour. Also, they shall be permitted to be used where additional insulation strength over the 100 percent level category is desirable.3 173 Percent Insulation Level. Cables in this category shall be permitted to be applied under all of the following conditions: (1) In industrial establishments where the conditions of maintenance and supervision ensure that only qualifed persons service the installation (2) Where the fault clearing time requirements of the 133 percent level category cannot be met (3) Where an orderly shutdown is essential to protect equipment and personnel (4) There is adequate assurance that the faulted section willbe de-energized in an orderly shutdown Also, cables with this insulation thickness shall be permitted to be used in 100 or 133 percent insulation level applications where additional insulation strength is desirable.

ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLE 310.104(E)

Table 310.104(E). Thickness of Insulation for Shielded Solid Dielectric Insulated Conductors Rated 2001 to 35,000 Volts.

2,001-5,000 Volts 5,001-8,000 Volts

25,001-28,000 Volts 28,001-35,000 Volts

8,001-15,000 Volts 15,001-25,000 Volts

Conductor Size (AWG or kcmil)

100 Percent

InsulationLevel1

100 Percent

InsulationLevel1

133 Percent

InsulationLevel2

173 Percent

InsulationLevel3

100 Percent

InsulationLevel1

133 Percent

InsulationLevel2

173 Percent

InsulationLevel3

100 Percent

InsulationLevel1

133 Percent

InsulationLevel2

173 Percent

InsulationLevel3

mm

2.29

2.29

2.29

2.29

2.29

mils

90

90

90

90

90

mm

–

2.92

2.92

2.92

2.92

mils

–

115

115

115

115

mm

–

3.56

3.56

3.56

3.56

mils

–

140

140

140

140

mm

–

4.45

4.45

4.45

4.45

mils

–

175

175

175

175

mm

–

–

4.45

4.45

4.45

mils

–

–

175

175

175

mm

–

–

5.59

5.59

5.59

mils

–

–

220

220

220

mm

–

–

6.60

6.60

6.60

mils

–

–

260

260

260

mm

–

–

–

6.60

6.60

mils

–

–

–

260

260

mm

–

–

–

8.13

8.13

mils

–

–

–

320

320

mm

–

–

–

mils

–

–

–

420

420

8

6-4

2

1

1/0-2000

10.67

10.67


100 Percent

InsulationLevel1

133 Percent

InsulationLevel2

173 Percent

InsulationLevel3

100 Percent

InsulationLevel1

133 Percent

InsulationLevel2

173 Percent

InsulationLevel3

mm

7.11

7.11

mils

280

280

mm

8.76

8.76

mils

345

345

mm

11.30

11.30

mils

445

445

mm

–

8.76

mils

–

345

mm

–

10.67

mils

–

420

mm

–

14.73

mils

–

580

1

1/0-2000

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ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLES 310.60(C)(67) AND 310.60(C)(69)

Table 310.60(C)(67) Ampacities of Insulated Single Copper Conductor Cables Triplexed in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)*

Table 310.60(C)(69) Ampacities of Insulated Single Copper Conductor Isolated in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)*

86421

1/02/03/04/0250350500750

1000

Temperature Rating of Conductor [See table 310.104(C)]

2,001-5,000 Volts Ampacity 5,001-35,000 Volts Ampacity

6590

120160185215250290335375465580750880

7499

130175205240275320375415515645835980

–100130170195225260300345380470580730850

–110140195225255295340390430525650820950

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


86421

1/02/03/04/0250350500750

10001250150017502000

Temperature Rating of Conductor [See table 310.104(C)]2,001-5,000 Volts

Ampacity5,001-15,000 Volts

Ampacity15,001-35,000 Volts

Ampacity

83110145190225260300345400445550695900

10751230136514951605

93120160215250290330385445495615775

100012001370152516651790

–110150195225260300345400445550685885

10601210134514701575

–12516521525029033538544549561076599011851350150016401755

––––

225260300345395440545680870

10401185131514301535

––––

25029033038044549060575597011601320146515951710

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


*Refer to 310.60(C)(2) for the ampacity correction factors where the ambient temperature is other than 40°C (104°F)

Technical Reference

227800.HOU.WIRE


ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLES 310.60(C)(71), 310.60(C)(73) AND 310.60(C)(75)

Table 310.60(C)(71) Ampacities of an Insulated Three Conductor Copper Cable Isolated in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)*

Table 310.60(C)(73) Ampacities of an Insulated Triplexed or Three-Conductor Copper Cables in Isolated Conduit in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)*

86421

1/02/03/04/0250350500750

1000



5979

105140160185215250285320395485615705

6688115154180205240280320355440545685790

–93

120165185215245285325360435535670770

–105135185210240275315360400490600745860

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


Table 310.60(C)(75) Ampacities of an Insulated ThreeConductor Copper Cable Isolated in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)*

86421

1/02/03/04/0250350500750

1000



526991

125140165190220255280350425525590

5877

100135155185210245285315390475585660

–83

105145165195220250290315385470570650

–92

120165185215245280320350430525635725

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


86421

1/02/03/04/0250350500750

1000



557597

130155180205240280315385475600690

6184110145175200225270305355430530665770

–83110150170195225260295330395480585675

–93

12016519021525529033036540

535655755

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


*Refer to 310.60(C)(2) for the ampacity correction factors where the ambient temperature is other than 40°C (104°F)

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ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLE 310.60(C)(77) AND 310.60(C)(79)

Table 310.60(C)(77) Ampacities of Three Single-Insulated Copper Conductors in Underground Electrical Ducts (Three Conductors per Electrical Duct) Based on Ambient Earth Temperature of 20°C (68°F), Electrical Duct Arrangement in Accordance with Figure 310.60, 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Conductor Temperatures of 90°C (194°F) and 105°C (221°F)

Table 310.60(C)(79) Ampacities of Three Insulated Copper Conductors Cabled Within an Overall Covering (Three Conductor Cable) in Underground Electrical Ducts (One Cable per Electrical Duct) Based on Ambient Earth Temperature of 20°C (68°F), Electrical Duct Arrangement in Accordance with Figure 310.60, 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Conductor Temperatures of 90°C (194°F) and 105°C (221°F)

86421

1/02/03/04/0250350500750

1000

86421

1/02/03/04/0250350500750

1000

86421

1/02/03/04/0250350500750

1000



6485110145170195220250290320385470585670

6992

120155180210265270310345415505630720

–90115155175200230260295325390465656640

–97

125165185215245275315345415500610690

567395

125140160185210235260315375460525

6079

100130150175195225255280335405495565

–7799

130145165185210240260310370440495

–83

105135155175200225255280330395475535

486280

105115135150170195210250300365410

526786110125145160185210225270325395445

–6482

105120135150170190210245290350390

–6888115125145165185205225265310375415

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


One Circuit [See Figure 310.60, Detail 1]

Three Circuit [See Figure 310.60, Detail 2]

Six Circuit [See Figure 310.60, Detail 3]

86421

1/02/03/04/0250350500750

1000

86421

1/02/03/04/0250350500750

1000

86421

1/02/03/04/0250350500750

1000



5978

100135155175200230265290355430530600

6484110145165190220250285315380460570645

–88115150170195220250285310375450545615

–95

125160185210235270305335400485585660

536989115135150170195225245295355430485

577496

125145165185210240265315380465520

–7597

125140160185205230255305360430485

–81

105135155175195220250270325385465515

46607798110125145165185200240290350390

506583

105120135155175200220270310375420

–6381

105115130150170190205245290340380

–6887110125145160180200220275305365405

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


One Circuit [See Figure 310.60, Detail 1]

Three Circuit [See Figure 310.60, Detail 2]

Six Circuit [See Figure 310.60, Detail 3]

Technical Reference

229800.HOU.WIRE


ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLE 310.60(C)(81) AND 310.60(C)(83)

Table 310.60(C)(81) Ampacities of Single Insulated Copper Conductors Directly Buried in Earth Based on Ambient Earth Temperature of 20°C (68°F), Arrangement per Figure 310.60, 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Conductor Temperatures of 90°C (194°F) and 105°C (221°F)

Table 310.60(C)(83) Ampacities of Three Insulated Copper Conductors Cabled Within an Overall Covering (Three Conductor Cable), Directly Buried in Earth Based on Ambient Earth Temperature of 20°C (68°F), Arrangement per Figure 310.60, 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Conductor Temperatures of 90°C (194°F) and 105°C (221°F)

86421

1/02/03/04/0250350500750

1000

86421

1/02/03/04/0250350500750

1000



110140180230260295335385435470470690845980

115150195250280320365415465510615745910

1055

–130170210240275310355405440535650805930

–140180225260295335380435475575700865

1005

100130165215240275310355400435520630775890

110140180230260295335380430470560680835960

–120160195225255290330375410495600740855

–130170210240275315355405240530645795920

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105


One Circuit, Three Conductors [See Figure 310.60, Detail 9]

Two Circuit, Six Conductors [See Figure 310.60, Detail 10]

86421

1/02/03/04/0250350500750

1000

86421

1/02/03/04/0250350500750

1000



85105135180200230260295335365240530650730

89115150190215245280320360395475570700785

–115145185210240270305350380460550665750

–120155200225255290330375410495590720810

80100130165185215240275310340410490595665

84105140180200230260295335365440525640715

–105135170195220250280320350420500605675

–115145185210235270305345375450535650730

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105




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ARTICLE 310: CONDUCTORS FOR GENERAL WIRINGNEC TABLE 310.60(C)(85)

86421

1/02/03/04/0250350500750

1000

86421

1/02/03/04/0250350500750

1000



90120150195225255290330375410490590725825

95130165205240270310360405445580635780885

–115150190215245275315360390470565685770

–120160205230260295340385410505605740830

85110140180205235265300340370445535650740

90115150195220250285320365395480575700795

–105140175200225255290325355425510615690

–115150190215240275315350380455545660745

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105

90°C (194°F)Type MV-90

105°C (221°F)Type MV-105




Table 310.60(C)(85) Ampacities of an Three Triplexed Single Insulated Copper Conductors Directly Buried in Earth Based on Ambient Earth Temperatures of 20°C (68°F), Arrangement per Figure 310.60, 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Conductor Temperatures 90°C (194°F) and 105°C (221°F)

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