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Chapter 3 Wiring Methods and Materials
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315.17(B)(1)
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Type MV cable joints, terminations, or connectors shall be durably marked on the surface. [315.17(B)(1)](https://2023.antflix.net#315.17(B)(1))
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https://2023.antflix.net#315.17(B)(1)
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Chapter 3 Wiring Methods and Materials
|
315.17(B)(2)
|
Type MV cable joints, terminations, or connectors shall be marked by means of a durably printed tag or label attached to joint or termination. [315.17(B)(2)](https://2023.antflix.net#315.17(B)(2))
|
https://2023.antflix.net#315.17(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
315.17(C)
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Type MV cable joints and cable terminations shall be permitted to be marked to indicate special characteristics, such as limited smoke and sunlight resistance. [315.17(C)](https://2023.antflix.net#315.17(C))
|
https://2023.antflix.net#315.17(C)
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Chapter 3 Wiring Methods and Materials
|
315.30
|
A qualified person(s) with documented training and experience shall perform the installation and testing of Type MV cable. A qualified person(s) with documented training and experience in the installation of Type MV cable joints shall perform the installation of Type MV cable joints. A qualified person(s) with documented training and experience in the installation of Type MV cable terminations shall perform the installation of Type MV cable terminations. Informational Note No. 1: See ANSI/NECA/NCSCB 600-2020, Standard for Installing and Maintaining Medium-Voltage Cable, and IEEE 576, Recommended Practice for Installation, Termination, and Testing of Insulated Power Cables as Used in Industrial and Commercial Applications, for information about accepted industry practices and installation procedures for medium-voltage cable. Informational Note No. 2: Where medium-voltage cable is used for dc circuits, low frequency polarization can create hazardous voltages. When handling the cable these voltages could be present or could develop on dc stressed cable while the circuit is energized. Solidly grounding the cable prior to contacting, cutting or disconnecting cables in dc circuits is a method to discharge these voltages. [315.30](https://2023.antflix.net#315.30)
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https://2023.antflix.net#315.30
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Chapter 3 Wiring Methods and Materials
|
315.32(A)
|
Type MV cable shall be permitted for use on power systems rated up to and including 35,000 volts, nominal, as follows: In wet or dry locations.In raceways.In cable trays, where identified for the use, in accordance with 392.10, 392.20(B), (C), and (D), 392.22(C), 392.30(B)(1), 392.46, 392.56, and 392.60. Type MV cable that has an overall metallic sheath or armor, complies with the requirements for Type MC cable, and is identified as "MV or MC" shall be permitted to be installed in cable trays in accordance with 392.10(B)(2).In messenger-supported wiring in accordance with Part II of Article 396.As exposed runs in accordance with 305.3. Type MV cable that has an overall metallic sheath or armor, complies with the requirements for Type MC cable, and is identified as "MV or MC" shall be permitted to be installed as exposed runs of metal-clad cable in accordance with 305.3.Corrosive conditions where exposed to oils, greases, vapors, gases, fumes, liquids, or other substances having a deleterious effect on the conductor or insulation shall be of a type suitable for the application.Conductors in parallel in accordance with 310.10(G).Type MV cable used where exposed to direct sunlight shall be identified for the use.Direct buried in accordance with 315.36. [315.32(A)](https://2023.antflix.net#315.32(A))
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https://2023.antflix.net#315.32(A)
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Chapter 3 Wiring Methods and Materials
|
315.32(B)
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Type MV cable joints and terminations shall be permitted for use on power systems rated up to and including 35,000 volts, nominal, as follows:
Type MV cable joints and terminations, used where exposed to direct sunlight, shall be identified for the use.
Direct buried.
Where used intermittently or continuously submerged in water at a depth not exceeding 7 m (23 ft) type MV cable joints and terminations shall be identified for the use.
The environmental operating temperature range shall be identified.
Where used in one or more of the following conditions Type MV cable joints and terminations shall be identified for the use:
Underground chambers
Tunnels
Conduits
Manholes
Vaults
Corrosive conditions where exposed to oils, greases, vapors, gases, fumes, liquids, or other substances having a deleterious effect on the joint or termination shall be of a type suitable for the application.
In cable trays, where identified for use, in accordance with 392.10, 392.20(B), (C) and (D), 392.22(C), 392.30(B)(1), 392.46, 392.56, and 392.60.
Informational Note No. 1: The "uses permitted" is not an all-inclusive list.
Informational Note No. 2: See IEEE-404, IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2.5kV to 500kV, for more information on cable joints. Cable joints are often referred to as splices. However, the term splice includes many other applications not included in the definition of a cable joint.
Informational Note No. 3: See IEEE-48, IEEE Standard for Test Procedures and Requirements for Alternating-Current Cable Terminations Used on Shielded Cables Having Laminated insulation Rated 2.5 kV through 765 kV or Extruded Insulation Rated 2.5 kV through 500 kV, for information on terminations. Type MV cable terminations include terminations used to connect directly to equipment or insulators.
Informational Note No. 4: See IEEE-386, IEEE Standard for Separable Insulated Connector Systems for Power Distribution Systems Rated 2.5kV through 35 kV, and IEEE-1215, IEEE Guide for the Application of Separable Insulated Connectors, for more information on separable insulated connectors. Type MV cable terminations also include separable insulated connectors, which are a type of pluggable cable termination and can be used for connection to equipment, such as switchgear or transformers. A separable connector has a matching interface that the separable connector plugs into on the equipment, such as switchgear or transformers. Separable connectors can also be ganged together to form a distribution junction using specialized junction brackets. [315.32(B)](https://2023.antflix.net#315.32(B))
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https://2023.antflix.net#315.32(B)
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Chapter 3 Wiring Methods and Materials
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315.36
|
Type MV conductors and cables used for direct burial applications shall be shielded, identified for such use, and installed in accordance with 305.15. Exception No. 1: Nonshielded multiconductor cables rated 2001 volts to 2400 volts shall be permitted if the cable has an overall metallic sheath or armor. The metallic shield, sheath, or armor shall be connected to a grounding electrode conductor, a grounding busbar, or a grounding electrode. Exception No. 2: Airfield lighting cable used in series circuits that are rated up to 5000 volts and are powered by regulators shall be permitted to be nonshielded. Informational Note to Exception No. 2: Federal Aviation Administration (FAA) Advisory Circulars (ACs) provide additional practices and methods for airport lighting. [315.36](https://2023.antflix.net#315.36)
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https://2023.antflix.net#315.36
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Chapter 3 Wiring Methods and Materials
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315.40
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Type MV cable terminated in equipment or installed in pull boxes or vaults shall be secured and supported by metallic or nonmetallic supports suitable to withstand the weight by cable ties listed and identified for securement and support, or other approved means, at intervals not exceeding 1.5 m (5 ft) from terminations or a maximum of 1.8 m (6 ft) between supports. [315.40](https://2023.antflix.net#315.40)
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https://2023.antflix.net#315.40
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Chapter 3 Wiring Methods and Materials
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315.44
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Nonshielded, ozone-resistant insulated conductors with a maximum phase-to-phase voltage of 5000 volts shall be permitted in Type MC cables in industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons service the installation. For other establishments, solid dielectric insulated conductors operated above 2000 volts in permanent installations shall have ozone-resistant insulation and shall be shielded. All metallic insulation shields shall be connected to a grounding electrode conductor, a grounding busbar, an equipment grounding conductor, or a grounding electrode. Equipment grounding conductors installed with circuits using medium voltage cables shall be sized according to 250.190(C). Informational Note: The primary purposes of shielding are to confine the voltage stresses to the insulation, dissipate insulation leakage current, and drain off the capacitive charging current. Exception No. 1: Nonshielded insulated conductors listed by a qualified testing laboratory shall be permitted for use up to 2400 volts under the following conditions: (1) Conductors shall have insulation resistant to electric discharge and surface tracking, or the insulated conductor(s) shall be covered with a material resistant to ozone, electric discharge, and surface tracking. (2) Where used in wet locations, the insulated conductor(s) shall have an overall nonmetallic jacket or a continuous metallic sheath. (3) Insulation and jacket thicknesses shall be in accordance with Table 315.10(B). Exception No. 2: Nonshielded insulated conductors listed by a qualified testing laboratory shall be permitted for use up to 5000 volts to replace existing nonshielded conductors, on existing equipment in industrial establishments only, under the following conditions: (1) Where the condition of maintenance and supervision ensures that only qualified personnel install and service the installation. (2) Conductors shall have insulation resistant to electric discharge and surface tracking, or the insulated conductor(s) shall be covered with a material resistant to ozone, electric discharge, and surface tracking. (3) Where used in wet locations, the insulated conductor(s) shall have an overall nonmetallic jacket or a continuous metallic sheath, (4) Insulation and jacket thicknesses shall be in accordance with Table 315.10(B). Informational Note: Relocation or replacement of equipment may not comply with the term existing as related to this exception. Exception No. 3: Where permitted in 315.36, Exception No. 2. [315.44](https://2023.antflix.net#315.44)
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https://2023.antflix.net#315.44
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Chapter 3 Wiring Methods and Materials
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315.45
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Type MV cable joints and terminations shall be provided with means to connect the metallic insulation shield to ground if required. [315.45](https://2023.antflix.net#315.45)
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https://2023.antflix.net#315.45
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Chapter 3 Wiring Methods and Materials
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315.60(A)(1)
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Ampacities for solid dielectric-insulated conductors shall be permitted to be determined by tables or under engineering supervision, as provided in 315.60(B) and (C). The ampacity of Type MV cable installed in cable tray shall be determined in accordance with 392.80(B). [315.60(A)(1)](https://2023.antflix.net#315.60(A)(1))
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https://2023.antflix.net#315.60(A)(1)
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Chapter 3 Wiring Methods and Materials
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315.60(A)(2)
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Where more than one calculated or tabulated ampacity could apply for a given circuit length, the lowest value shall be used. Exception: Where different ampacities apply to portions of a circuit, the higher ampacity shall be permitted to be used if the total portion(s) of the circuit with the lower ampacity does not exceed the lesser of 3.0 m (10 ft) or 10 percent of the total circuit. Informational Note: See 110.40 for conductor temperature limitations due to termination provisions. [315.60(A)(2)](https://2023.antflix.net#315.60(A)(2))
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https://2023.antflix.net#315.60(A)(2)
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Chapter 3 Wiring Methods and Materials
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315.60(B)
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Under engineering supervision, conductor ampacities shall be permitted to be calculated by using the following general equation: [315.60(B)] where: Tc = conductor temperature (°C) Ta = ambient temperature (°C) ΔTd = dielectric loss temperature rise Rdc = dc resistance of conductor at temperature, Tc Yc = component ac resistance resulting from skin effect and proximity effect Rca = effective thermal resistance between conductor and surrounding ambient Informational Note: The dielectric loss temperature rise (ΔTd) is negligible for single circuit extruded dielectric cables rated below 46 kV. [315.60(B)](https://2023.antflix.net#315.60(B))
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https://2023.antflix.net#315.60(B)
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Chapter 3 Wiring Methods and Materials
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315.60(C)
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Ampacities for conductors rated 2001 volts to 35,000 volts shall be as specified in Table 315.60(C)(1) through Table 315.60(C)(20). Ampacities for ambient temperatures other than those specified in the ampacity tables shall be corrected in accordance with 315.60(D)(4).
Informational Note No. 1: See IEEE 835, Standard Power Cable Ampacity Tables, and the references therein for availability of all factors and constants for ampacities calculated in accordance with 315.60(A).
Informational Note No. 2: See 210.19, Informational Note, for voltage drop on branch circuits that this section does not take into consideration. See 215.2(A)(2), Informational Note No. 2, for voltage drop on feeders that this section does not take into consideration.
Table 315.60(C)(1) Ampacities of Insulated Single Copper Conductor Cables Triplexed in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
65
74
-
-
6
90
99
100
110
4
120
130
130
140
2
160
175
170
195
1
185
205
195
225
1/0
215
240
225
255
2/0
250
275
260
295
3/0
290
320
300
340
4/0
335
375
345
390
250
375
415
380
430
350
465
515
470
525
500
580
645
580
650
750
750
835
730
820
1000
880
980
850
950
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(2) Ampacities of Insulated Single Aluminum Conductor Cables Triplexed in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
50
57
-
-
6
70
77
75
84
4
90
100
100
110
2
125
135
130
150
1
145
160
150
175
1/0
170
185
175
200
2/0
195
215
200
230
3/0
225
250
230
265
4/0
265
290
270
305
250
295
325
300
335
350
365
405
370
415
500
460
510
460
515
750
600
665
590
660
1000
715
800
700
780
Note: Refer to 315.60(E) for basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(3) Ampacities of Insulated Single Copper Conductor Isolated in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—15,000 Volts Ampacity
15,001—35,000 Volts Ampacity
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
8
83
93
-
-
-
-
6
110
120
110
125
-
-
4
145
160
150
165
-
-
2
190
215
195
215
-
-
1
225
250
225
250
225
250
1/0
260
290
260
290
260
290
2/0
300
330
300
335
300
330
3/0
345
385
345
385
345
380
4/0
400
445
400
445
395
445
250
445
495
445
495
440
490
350
550
615
550
610
545
605
500
695
775
685
765
680
755
750
900
1000
885
990
870
970
1000
1075
1200
1060
1185
1040
1160
1250
1230
1370
1210
1350
1185
1320
1500
1365
1525
1345
1500
1315
1465
1750
1495
1665
1470
1640
1430
1595
2000
1605
1790
1575
1755
1535
1710
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(4) Ampacities of Insulated Single Aluminum Conductor Isolated in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—15,000 Volts Ampacity
15,001—35,000 Volts Ampacity
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
8
64
71
-
-
-
-
6
85
95
87
97
-
-
4
115
125
115
130
-
-
2
150
165
150
170
-
-
1
175
195
175
195
175
195
1/0
200
225
200
225
200
225
2/0
230
260
235
260
230
260
3/0
270
300
270
300
270
300
4/0
310
350
310
350
310
345
250
345
385
345
385
345
380
350
430
480
430
480
430
475
500
545
605
535
600
530
590
750
710
790
700
780
685
765
1000
855
950
840
940
825
920
1250
980
1095
970
1080
950
1055
1500
1105
1230
1085
1215
1060
1180
1750
1215
1355
1195
1335
1165
1300
2000
1320
1475
1295
1445
1265
1410
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(5) Ampacities of an Insulated Three-Conductor Copper Cable Isolated in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
59
66
-
-
6
79
88
93
105
4
105
115
120
135
2
140
154
165
185
1
160
180
185
210
1/0
185
205
215
240
2/0
215
240
245
275
3/0
250
280
285
315
4/0
285
320
325
360
250
320
355
360
400
350
395
440
435
490
500
485
545
535
600
750
615
685
670
745
1000
705
790
770
860
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(6) Ampacities of an Insulated Three-Conductor Aluminum Cable Isolated in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
46
51
-
-
6
61
68
72
80
4
81
90
95
105
2
110
120
125
145
1
125
140
145
165
1/0
145
160
170
185
2/0
170
185
190
215
3/0
195
215
220
245
4/0
225
250
255
285
250
250
280
280
315
350
310
345
345
385
500
385
430
425
475
750
495
550
540
600
1000
585
650
635
705
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(7) Ampacities of an Insulated Triplexed or Three Single-Conductor Copper Cables in Isolated Conduit in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
55
61
-
-
6
75
84
83
93
4
97
110
110
120
2
130
145
150
165
1
155
175
170
190
1/0
180
200
195
215
2/0
205
225
225
255
3/0
240
270
260
290
4/0
280
305
295
330
250
315
355
330
365
350
385
430
395
440
500
475
530
480
535
750
600
665
585
655
1000
690
770
675
755
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(8) Ampacities of an Insulated Triplexed or Three Single-Conductor Aluminum Cables in Isolated Conduit in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
43
48
-
-
6
58
65
65
72
4
76
85
84
94
2
100
115
115
130
1
120
135
130
150
1/0
140
155
150
170
2/0
160
175
175
200
3/0
190
210
200
225
4/0
215
240
230
260
250
250
280
255
290
350
305
340
310
350
500
380
425
385
430
750
490
545
485
540
1000
580
645
565
640
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(9) Ampacities of an Insulated Three-Conductor Copper Cable in Isolated Conduit in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
52
58
-
-
6
69
77
83
92
4
91
100
105
120
2
125
135
145
165
1
140
155
165
185
1/0
165
185
195
215
2/0
190
210
220
245
3/0
220
245
250
280
4/0
255
285
290
320
250
280
315
315
350
350
350
390
385
430
500
425
475
470
525
750
525
585
570
635
1000
590
660
650
725
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(10) Ampacities of an Insulated Three-Conductor Aluminum Cable in Isolated Conduit in Air
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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
8
41
46
-
-
6
53
59
64
71
4
71
79
84
94
2
96
105
115
125
1
110
125
130
145
1/0
130
145
150
170
2/0
150
165
170
190
3/0
170
190
195
220
4/0
200
225
225
255
250
220
245
250
280
350
275
305
305
340
500
340
380
380
425
750
430
480
470
520
1000
505
560
550
615
Note: Refer to 315.60(E) for the basis of ampacities, 315.10(A) for conductor maximum operating temperature and application, and 315.60(D)(4) for the ampacity correction factors where the ambient air temperature is other than 40°C (104°F).
Table 315.60(C)(11) Ampacities of Three Single-Insulated Copper Conductors in Underground Electrical Ducts (Three Conductors per Electrical Duct)
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 1.]
8
64
69
-
-
6
85
92
90
97
4
110
120
115
125
2
145
155
155
165
1
170
180
175
185
1/0
195
210
200
215
2/0
220
235
230
245
3/0
250
270
260
275
4/0
290
310
295
315
250
320
345
325
345
350
385
415
390
415
500
470
505
465
500
750
585
630
565
610
1000
670
720
640
690
Three Circuits [See Figure 315.60(D)(3), Detail 2.]
8
56
60
-
-
6
73
79
77
83
4
95
100
99
105
2
125
130
130
135
1
140
150
145
155
1/0
160
175
165
175
2/0
185
195
185
200
3/0
210
225
210
225
4/0
235
255
240
255
250
260
280
260
280
350
315
335
310
330
500
375
405
370
395
750
460
495
440
475
1000
525
565
495
535
Six Circuits [See Figure 315.60(D)(3), Detail 3.]
8
48
52
-
-
6
62
67
64
68
4
80
86
82
88
2
105
110
105
115
1
115
125
120
125
1/0
135
145
135
145
2/0
150
160
150
165
3/0
170
185
170
185
4/0
195
210
190
205
250
210
225
210
225
350
250
270
245
265
500
300
325
290
310
750
365
395
350
375
1000
410
445
390
415
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(12) Ampacities of Three Single-Insulated Aluminum Conductors in Underground Electrical Ducts (Three Conductors per Electrical Duct)
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 1.]
8
50
54
-
-
6
66
71
70
75
4
86
93
91
98
2
115
125
120
130
1
130
140
135
145
1/0
150
160
155
165
2/0
170
185
175
190
3/0
195
210
200
215
4/0
225
245
230
245
250
250
270
250
270
350
305
325
305
330
500
370
400
370
400
750
470
505
455
490
1000
545
590
525
565
Three Circuits [See Figure 315.60(D)(3), Detail 2.]
8
44
47
-
-
6
57
61
60
65
4
74
80
77
83
2
96
105
100
105
1
110
120
110
120
1/0
125
135
125
140
2/0
145
155
145
155
3/0
160
175
165
175
4/0
185
200
185
200
250
205
220
200
220
350
245
265
245
260
500
295
320
290
315
750
370
395
355
385
1000
425
460
405
440
Six Circuits [See Figure 315.60(D)(3), Detail 3.]
8
38
41
-
-
6
48
52
50
54
4
62
67
64
69
2
80
86
80
88
1
91
98
90
99
1/0
105
110
105
110
2/0
115
125
115
125
3/0
135
145
130
145
4/0
150
165
150
160
250
165
180
165
175
350
195
210
195
210
500
240
255
230
250
750
290
315
280
305
1000
335
360
320
345
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(13) Ampacities of Three Insulated Copper Conductors Cabled Within an Overall Covering (Three-Conductor Cable) in Underground Electrical Ducts (One Cable per Electrical Duct)
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 1.]
8
59
64
-
-
6
78
84
88
95
4
100
110
115
125
2
135
145
150
160
1
155
165
170
185
1/0
175
190
195
210
2/0
200
220
220
235
3/0
230
250
250
270
4/0
265
285
285
305
250
290
315
310
335
350
355
380
375
400
500
430
460
450
485
750
530
570
545
585
1000
600
645
615
660
Three Circuits [See Figure 315.60(D)(3), Detail 2.]
8
53
57
-
-
6
69
74
75
81
4
89
96
97
105
2
115
125
125
135
1
135
145
140
155
1/0
150
165
160
175
2/0
170
185
185
195
3/0
195
210
205
220
4/0
225
240
230
250
250
245
265
255
270
350
295
315
305
325
500
355
380
360
385
750
430
465
430
465
1000
485
520
485
515
Six Circuits [See Figure 315.60(D)(3), Detail 3.]
8
46
50
-
-
6
60
65
63
68
4
77
83
81
87
2
98
105
105
110
1
110
120
115
125
1/0
125
135
130
145
2/0
145
155
150
160
3/0
165
175
170
180
4/0
185
200
190
200
250
200
220
205
220
350
240
270
245
275
500
290
310
290
305
750
350
375
340
365
1000
390
420
380
405
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(14) Ampacities of Three Insulated Aluminum Conductors Cabled Within an Overall Covering (Three-Conductor Cable) in Underground Electrical Ducts (One Cable per Electrical Duct)
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 1.]
8
46
50
-
-
6
61
66
69
74
4
80
86
89
96
2
105
110
115
125
1
120
130
135
145
1/0
140
150
150
165
2/0
160
170
170
185
3/0
180
195
195
210
4/0
205
220
220
240
250
230
245
245
265
350
280
310
295
315
500
340
365
355
385
750
425
460
440
475
1000
495
535
510
545
Three Circuits [See Figure 315.60(D)(3), Detail 2.]
8
41
44
-
-
6
54
58
59
64
4
70
75
75
81
2
90
97
100
105
1
105
110
110
120
1/0
120
125
125
135
2/0
135
145
140
155
3/0
155
165
160
175
4/0
175
185
180
195
250
190
205
200
215
350
230
250
240
255
500
280
300
285
305
750
345
375
350
375
1000
400
430
400
430
Six Circuits [See Figure 315.60(D)(3), Detail 3.]
8
36
39
-
-
6
46
50
49
53
4
60
65
63
68
2
77
83
80
86
1
87
94
90
98
1/0
99
105
105
110
2/0
110
120
115
125
3/0
130
140
130
140
4/0
145
155
150
160
250
160
170
160
170
350
190
205
190
205
500
230
245
230
245
750
280
305
275
295
1000
320
345
315
335
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(15) Ampacities of Single Insulated Copper Conductors Directly Buried in Earth
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 9.]
8
110
115
-
-
6
140
150
130
140
4
180
195
170
180
2
230
250
210
225
1
260
280
240
260
1/0
295
320
275
295
2/0
335
365
310
335
3/0
385
415
355
380
4/0
435
465
405
435
250
470
510
440
475
350
570
615
535
575
500
690
745
650
700
750
845
910
805
865
1000
980
1055
930
1005
Two Circuits, Six Conductors [See Figure 315.60(D)(3), Detail 10.]
8
100
110
-
-
6
130
140
120
130
4
165
180
160
170
2
215
230
195
210
1
240
260
225
240
1/0
275
295
255
275
2/0
310
335
290
315
3/0
355
380
330
355
4/0
400
430
375
405
250
435
470
410
440
350
520
560
495
530
500
630
680
600
645
750
775
835
740
795
1000
890
960
855
920
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(16) Ampacities of Single Insulated Aluminum Conductors Directly Buried in Earth
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 9.]
8
85
90
-
-
6
110
115
100
110
4
140
150
130
140
2
180
195
165
175
1
205
220
185
200
1/0
230
250
215
230
2/0
265
285
245
260
3/0
300
320
275
295
4/0
340
365
315
340
250
370
395
345
370
350
445
480
415
450
500
540
580
510
545
750
665
720
635
680
1000
780
840
740
795
Two Circuits, Six Conductors [See Figure 315.60(D)(3), Detail 10.]
8
80
85
-
-
6
100
110
95
100
4
130
140
125
130
2
165
180
155
165
1
190
200
175
190
1/0
215
230
200
215
2/0
245
260
225
245
3/0
275
295
255
275
4/0
310
335
290
315
250
340
365
320
345
350
410
440
385
415
500
495
530
470
505
750
610
655
580
625
1000
710
765
680
730
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(17) Ampacities of Three Insulated Copper Conductors Cabled Within an Overall Covering (Three-Conductor Cable), Directly Buried in Earth
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 5.]
8
85
89
-
-
6
105
115
115
120
4
135
150
145
155
2
180
190
185
200
1
200
215
210
225
1/0
230
245
240
255
2/0
260
280
270
290
3/0
295
320
305
330
4/0
335
360
350
375
250
365
395
380
410
350
440
475
460
495
500
530
570
550
590
750
650
700
665
720
1000
730
785
750
810
Two Circuits [See Figure 315.60(D)(3), Detail 6.]
8
80
84
-
-
6
100
105
105
115
4
130
140
135
145
2
165
180
170
185
1
185
200
195
210
1/0
215
230
220
235
2/0
240
260
250
270
3/0
275
295
280
305
4/0
310
335
320
345
250
340
365
350
375
350
410
440
420
450
500
490
525
500
535
750
595
640
605
650
1000
665
715
675
730
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(18) Ampacities of Three Insulated Aluminum Conductors Cabled Within an Overall Covering (Three-Conductor Cable), Directly Buried in Earth
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 5.]
8
65
70
-
-
6
80
88
90
95
4
105
115
115
125
2
140
150
145
155
1
155
170
165
175
1/0
180
190
185
200
2/0
205
220
210
225
3/0
230
250
240
260
4/0
260
280
270
295
250
285
310
300
320
350
345
375
360
390
500
420
450
435
470
750
520
560
540
580
1000
600
650
620
665
Two Circuits [See Figure 315.60(D)(3), Detail 6.]
8
60
66
-
-
6
75
83
80
95
4
100
110
105
115
2
130
140
135
145
1
145
155
150
165
1/0
165
180
170
185
2/0
190
205
195
210
3/0
215
230
220
240
4/0
245
260
250
270
250
265
285
275
295
350
320
345
330
355
500
385
415
395
425
750
480
515
485
525
1000
550
590
560
600
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(19) Ampacities of Three Triplexed Single Insulated Copper Conductors Directly Buried in Earth
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 7.]
8
90
95
-
-
6
120
130
115
120
4
150
165
150
160
2
195
205
190
205
1
225
240
215
230
1/0
255
270
245
260
2/0
290
310
275
295
3/0
330
360
315
340
4/0
375
405
360
385
250
410
445
390
410
350
490
580
470
505
500
590
635
565
605
750
725
780
685
740
1000
825
885
770
830
Two Circuits, Six Conductors [See Figure 315.60(D)(3), Detail 8.]
8
85
90
-
-
6
110
115
105
115
4
140
150
140
150
2
180
195
175
190
1
205
220
200
215
1/0
235
250
225
240
2/0
265
285
255
275
3/0
300
320
290
315
4/0
340
365
325
350
250
370
395
355
380
350
445
480
425
455
500
535
575
510
545
750
650
700
615
660
1000
740
795
690
745
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor.
Table 315.60(C)(20) Ampacities of Three Triplexed Single Insulated Aluminum Conductors Directly Buried in Earth
Conductor Size (AWG or kcmil)
Temperature Rating of Conductor
2001—5000 Volts Ampacity
5001—35,000 Volts Ampacity
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 315.60(D)(3), Detail 7.]
8
70
75
-
-
6
90
100
90
95
4
120
130
115
125
2
155
165
145
155
1
175
190
165
175
1/0
200
210
190
205
2/0
225
240
215
230
3/0
255
275
245
265
4/0
290
310
280
305
250
320
350
305
325
350
385
420
370
400
500
465
500
445
480
750
580
625
550
590
1000
670
725
635
680
Two Circuits, Six Conductors [See Figure 315.60(D)(3), Detail 8.]
8
65
70
-
-
6
85
95
85
90
4
110
120
105
115
2
140
150
135
145
1
160
170
155
170
1/0
180
195
175
190
2/0
205
220
200
215
3/0
235
250
225
245
4/0
265
285
255
275
250
290
310
280
300
350
350
375
335
360
500
420
455
405
435
750
520
560
485
525
1000
600
645
565
605
Note: Refer to 315.60(F) for basis of ampacities and Table 315.10(A) for the temperature rating of the conductor. [315.60(C)](https://2023.antflix.net#315.60(C))
|
https://2023.antflix.net#315.60(C)
|
Chapter 3 Wiring Methods and Materials
|
315.60(D)(1)
|
Ampacities shown in Table 315.60(C)(3), Table 315.60(C)(4), Table 315.60(C)(15), and Table 315.60(C)(16) shall apply for cables with shields grounded at one point only. Where shields for these cables are grounded at more than one point, ampacities shall be adjusted to take into consideration the heating due to shield currents. Informational Note: Tables other than those listed contain the ampacity of cables with shields grounded at multiple points. [315.60(D)(1)](https://2023.antflix.net#315.60(D)(1))
|
https://2023.antflix.net#315.60(D)(1)
|
Chapter 3 Wiring Methods and Materials
|
315.60(D)(2)
|
Where the burial depth of direct burial or electrical duct bank circuits is modified from the values shown in a figure or table, ampacities shall be permitted to be modified as indicated in 315.60(D)(2)(a) and (D)(2)(b). No ampacity adjustments shall be required where the burial depth is decreased. Where burial depths are increased in part(s) of an electrical duct run, a decrease in ampacity of the conductors shall not be required, provided the total length of parts of the duct run increased in depth is less than 25 percent of the total run length.Where burial depths are deeper than shown in a specific underground ampacity table or figure, an ampacity derating factor of 6 percent per 300 mm (1 ft) increase in depth for all values of rho shall be permitted. [315.60(D)(2)](https://2023.antflix.net#315.60(D)(2))
|
https://2023.antflix.net#315.60(D)(2)
|
Chapter 3 Wiring Methods and Materials
|
315.60(D)(3)
|
At locations where electrical ducts enter equipment enclosures from underground, spacing between such ducts, as shown in Figure 315.60(D)(3), shall be permitted to be reduced without requiring the ampacity of conductors therein to be reduced.
FIGURE 315.60(D)(3) Cable Installation Dimensions for Use with Table 315.60(C)(11) Through Table 315.60(C)(20). [315.60(D)(3)](https://2023.antflix.net#315.60(D)(3))
|
https://2023.antflix.net#315.60(D)(3)
|
Chapter 3 Wiring Methods and Materials
|
315.60(D)(4)
|
Ampacities for ambient temperatures other than those specified in the ampacity tables shall be corrected in accordance with Table 315.60(D)(4) or shall be permitted to be calculated using the following equation:
[315.60(D)(4)]
where:
I'
=
ampacity corrected for ambient temperature
I
=
ampacity shown in the table for Tc and Ta
Tc
=
temperature rating of conductor (°C)
Ta'
=
new ambient temperature (°C)
Ta
=
ambient temperature used in the table (°C)
Informational Note: See 110.40 for ambient temperature adjustments for terminals.
Table 315.60(D)(4) Ambient Temperature Correction Factors
For ambient temperatures other than 40°C (104°F), multiply the allowable ampacities specified in the ampacity tables by the appropriate factor shown below.
Ambient Temperature (°C)
Temperature Rating of Conductor
Ambient Temperature (°F)
90°C
105°C
10 or less
1.26
1.21
50 or less
11—15
1.22
1.18
51—59
16—20
1.18
1.14
60—68
21—25
1.14
1.11
69—77
26—30
1.10
1.07
78—86
31—35
1.05
1.04
87—95
36—40
1.00
1.00
96—104
41—45
0.95
0.96
105—113
46—50
0.89
0.92
114—122
51—55
0.84
0.88
123—131
56—60
0.77
0.83
132—140
61—65
0.71
0.78
141—149
66—70
0.63
0.73
150—158
71—75
0.55
0.68
159—167
76—80
0.45
0.62
168—176
81—85
0.32
0.55
177—185
86—90
-
0.48
186—194
91—95
-
0.39
195—203
96—100
-
0.28
204—212
[315.60(D)(4)](https://2023.antflix.net#315.60(D)(4))
|
https://2023.antflix.net#315.60(D)(4)
|
Chapter 3 Wiring Methods and Materials
|
315.60(E)
|
Ampacities for conductors and cables in air shall be as specified in Table 315.60(C)(1) through Table 315.60(C)(10). Ampacities shall be based on the following: Conductor temperatures of 90°C (194°F) and 105°C (221°F)Ambient air temperature of 40°C (104°F)Informational Note: See 315.60(D)(4) where the ambient air temperature is other than 40°C (104°F). [315.60(E)](https://2023.antflix.net#315.60(E))
|
https://2023.antflix.net#315.60(E)
|
Chapter 3 Wiring Methods and Materials
|
315.60(F)
|
Ampacities for conductors and cables in underground electrical ducts and direct buried in earth shall be as specified in Table 315.60(C)(11) through Table 315.60(C)(20). Ampacities shall be based on the following: Ambient earth temperature of 20°C (68°F)Arrangement in accordance with Figure 315.60(D)(3)100 percent load factorThermal resistance (Rho) of 90Conductor temperatures 90°C (194°F) and 105°C (221°F)Minimum burial depths to the top electrical ducts or cables shall be in accordance with 305.15.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.). [315.60(F)](https://2023.antflix.net#315.60(F))
|
https://2023.antflix.net#315.60(F)
|
Chapter 3 Wiring Methods and Materials
|
320.1
|
This article covers the use, installation, and construction specifications for armored cable, Type AC. [320.1](https://2023.antflix.net#320.1)
|
https://2023.antflix.net#320.1
|
Chapter 3 Wiring Methods and Materials
|
320.6
|
Type AC cable and associated fittings shall be listed. [320.6](https://2023.antflix.net#320.6)
|
https://2023.antflix.net#320.6
|
Chapter 3 Wiring Methods and Materials
|
320.10
|
Type AC cable shall be permitted as follows: For feeders and branch circuits in both exposed and concealed installationsIn cable traysIn dry locationsEmbedded in plaster finish on brick or other masonry, except in damp or wet locationsTo be run or fished in the air voids of masonry block or tile walls where such walls are not exposed or subject to excessive moisture or dampnessInformational Note: The "Uses Permitted" is not an all-inclusive list. [320.10](https://2023.antflix.net#320.10)
|
https://2023.antflix.net#320.10
|
Chapter 3 Wiring Methods and Materials
|
320.12
|
Type AC cable shall not be used as follows: Where subject to physical damageIn damp or wet locationsIn air voids of masonry block or tile walls where such walls are exposed or subject to excessive moisture or dampnessWhere exposed to corrosive conditionsEmbedded in plaster finish on brick or other masonry in damp or wet locations [320.12](https://2023.antflix.net#320.12)
|
https://2023.antflix.net#320.12
|
Chapter 3 Wiring Methods and Materials
|
320.15
|
Exposed runs of cable, except as provided in 300.11(B), shall closely follow the surface of the building finish or of running boards. Exposed runs shall also be permitted to be installed on the underside of joists where supported at each joist and located so as not to be subject to physical damage. [320.15](https://2023.antflix.net#320.15)
|
https://2023.antflix.net#320.15
|
Chapter 3 Wiring Methods and Materials
|
320.17
|
Type AC cable shall be protected in accordance with 300.4(A), (C), and (D) where installed through or parallel to framing members. [320.17](https://2023.antflix.net#320.17)
|
https://2023.antflix.net#320.17
|
Chapter 3 Wiring Methods and Materials
|
320.23
|
Type AC cables in accessible attics or roof spaces shall be installed as specified in 320.23(A) and (B). [320.23](https://2023.antflix.net#320.23)
|
https://2023.antflix.net#320.23
|
Chapter 3 Wiring Methods and Materials
|
320.23(A)
|
Where run across the top of framing members, or across the face of rafters or studding within 2.1 m (7 ft) of the floor or horizontal surface, the cable shall be protected by guard strips that are at least as high as the cable. Where this space is not accessible by permanently installed stairs or ladders, protection shall only be required within 1.8 m (6 ft) of the nearest edge of the scuttle hole or attic entrance. [320.23(A)](https://2023.antflix.net#320.23(A))
|
https://2023.antflix.net#320.23(A)
|
Chapter 3 Wiring Methods and Materials
|
320.23(B)
|
Where the cable is installed parallel to the sides of rafters, studs, or ceiling or floor joists, neither guard strips nor running boards shall be required, and the installation shall also comply with 300.4(D). [320.23(B)](https://2023.antflix.net#320.23(B))
|
https://2023.antflix.net#320.23(B)
|
Chapter 3 Wiring Methods and Materials
|
320.24
|
Bends in Type AC cable shall be made such that the cable is not damaged. The radius of the curve of the inner edge of any bend shall not be less than five times the diameter of the Type AC cable. [320.24](https://2023.antflix.net#320.24)
|
https://2023.antflix.net#320.24
|
Chapter 3 Wiring Methods and Materials
|
320.30(A)
|
Type AC cable shall be supported and secured by staples; cable ties listed and identified for securement and support; straps, hangers, or similar fittings; or other approved means designed and installed so as not to damage the cable. Type AC cable fittings shall be permitted as a means of cable support. [320.30(A)](https://2023.antflix.net#320.30(A))
|
https://2023.antflix.net#320.30(A)
|
Chapter 3 Wiring Methods and Materials
|
320.30(B)
|
Unless otherwise permitted, Type AC cable shall be secured within 300 mm (12 in.) of every outlet box, junction box, cabinet, or fitting and at intervals not exceeding 1.4 m (41/2 ft). [320.30(B)](https://2023.antflix.net#320.30(B))
|
https://2023.antflix.net#320.30(B)
|
Chapter 3 Wiring Methods and Materials
|
320.30(C)
|
Unless otherwise permitted, Type AC cable shall be supported at intervals not exceeding 1.4 m (41/2 ft). Horizontal runs of Type AC cable installed in wooden or metal framing members or similar supporting means shall be considered supported and secured where such support does not exceed 1.4 m (41/2 ft) intervals. [320.30(C)](https://2023.antflix.net#320.30(C))
|
https://2023.antflix.net#320.30(C)
|
Chapter 3 Wiring Methods and Materials
|
320.30(D)
|
Type AC cable shall be permitted to be unsupported and unsecured where the cable complies with any of the following: Is fished between access points through concealed spaces in finished buildings or structures and supporting is impracticableIs not more than 600 mm (2 ft) in length at terminals where flexibility is necessaryIs not more than 1.8 m (6 ft) in length from the last point of cable support to the point of connection to a luminaire(s) or other electrical equipment and the cable and point of connection are within an accessible ceiling [320.30(D)](https://2023.antflix.net#320.30(D))
|
https://2023.antflix.net#320.30(D)
|
Chapter 3 Wiring Methods and Materials
|
320.40
|
At all points where the armor of AC cable terminates, a fitting shall be provided to protect wires from abrasion, unless the design of the outlet boxes or fittings is such as to afford equivalent protection, and, in addition, an insulating bushing or its equivalent protection shall be provided between the conductors and the armor. The connector or clamp by which the Type AC cable is fastened to boxes or cabinets shall be of such design that the insulating bushing or its equivalent will be visible for inspection. Where change is made from Type AC cable to other cable or raceway wiring methods, a box, fitting, or conduit body shall be installed at junction points as required in 300.15. [320.40](https://2023.antflix.net#320.40)
|
https://2023.antflix.net#320.40
|
Chapter 3 Wiring Methods and Materials
|
320.80
|
The ampacity shall be determined in accordance with 310.14. [320.80](https://2023.antflix.net#320.80)
|
https://2023.antflix.net#320.80
|
Chapter 3 Wiring Methods and Materials
|
320.80(A)
|
Armored cable installed in thermal insulation shall have conductors rated at 90°C (194°F). The ampacity of cable installed in these applications shall not exceed that of a 60°C (140°F) rated conductor. The 90°C (194°F) rating shall be permitted to be used for ampacity adjustment and correction calculations; however, the ampacity shall not exceed that of a 60°C (140°F) rated conductor. Where more than two Type AC cables containing two or more current-carrying conductors in each cable are installed in contact with thermal insulation, caulk, or sealing foam without maintaining spacing between cables, the ampacity of each conductor shall be adjusted in accordance with Table 310.15(C)(1). [320.80(A)](https://2023.antflix.net#320.80(A))
|
https://2023.antflix.net#320.80(A)
|
Chapter 3 Wiring Methods and Materials
|
320.80(B)
|
The ampacity of Type AC cable installed in cable tray shall be determined in accordance with 392.80(A). [320.80(B)](https://2023.antflix.net#320.80(B))
|
https://2023.antflix.net#320.80(B)
|
Chapter 3 Wiring Methods and Materials
|
320.100
|
Type AC cable shall have an armor of flexible metal tape and shall have an internal bonding strip of copper or aluminum in intimate contact with the armor for its entire length. [320.100](https://2023.antflix.net#320.100)
|
https://2023.antflix.net#320.100
|
Chapter 3 Wiring Methods and Materials
|
320.104
|
Insulated conductors shall be of a type listed in Table 310.4(1) or those identified for use in this cable. In addition, the conductors shall have an overall moisture-resistant and fire-retardant fibrous covering. For Type ACT, a moisture-resistant fibrous covering shall be required only on the individual conductors. [320.104](https://2023.antflix.net#320.104)
|
https://2023.antflix.net#320.104
|
Chapter 3 Wiring Methods and Materials
|
320.108
|
Type AC cable shall provide an adequate path for fault current as required by 250.4(A)(5) or (B)(4) to act as an equipment grounding conductor. [320.108](https://2023.antflix.net#320.108)
|
https://2023.antflix.net#320.108
|
Chapter 3 Wiring Methods and Materials
|
320.120
|
The cable shall be marked in accordance with 310.8, except that Type AC shall have ready identification of the manufacturer by distinctive external markings on the cable armor throughout its entire length. [320.120](https://2023.antflix.net#320.120)
|
https://2023.antflix.net#320.120
|
Chapter 3 Wiring Methods and Materials
|
322.1
|
This article covers the use, installation, and construction specifications for flat cable assemblies, Type FC. [322.1](https://2023.antflix.net#322.1)
|
https://2023.antflix.net#322.1
|
Chapter 3 Wiring Methods and Materials
|
322.6
|
Type FC and associated fittings shall be listed. [322.6](https://2023.antflix.net#322.6)
|
https://2023.antflix.net#322.6
|
Chapter 3 Wiring Methods and Materials
|
322.10
|
Flat cable assemblies shall be permitted only as follows: As branch circuits to supply suitable tap devices for lighting, small appliances, or small power loads. The rating of the branch circuit shall not exceed 30 amperes.Where installed for exposed work.In locations where they will not be subjected to physical damage. Where a flat cable assembly is installed less than 2.5 m (8 ft) above the floor or fixed working platform, it shall be protected by a cover identified for the use.In surface metal raceways identified for the use. The channel portion of the surface metal raceway systems shall be installed as complete systems before the flat cable assemblies are pulled into the raceways. [322.10](https://2023.antflix.net#322.10)
|
https://2023.antflix.net#322.10
|
Chapter 3 Wiring Methods and Materials
|
322.12
|
Flat cable assemblies shall not be used as follows: Where exposed to corrosive conditions, unless suitable for the applicationIn hoistways or on elevators or escalatorsIn any hazardous (classified) location, except as specifically permitted by other articles in this Code.Outdoors or in wet or damp locations unless identified for the use [322.12](https://2023.antflix.net#322.12)
|
https://2023.antflix.net#322.12
|
Chapter 3 Wiring Methods and Materials
|
322.30
|
The flat cable assemblies shall be supported by means of their special design features, within the surface metal raceways. The surface metal raceways shall be supported as required for the specific raceway to be installed. [322.30](https://2023.antflix.net#322.30)
|
https://2023.antflix.net#322.30
|
Chapter 3 Wiring Methods and Materials
|
322.40(A)
|
Each flat cable assembly dead end shall be terminated in an end-cap device identified for the use. The dead-end fitting for the enclosing surface metal raceway shall be identified for the use. [322.40(A)](https://2023.antflix.net#322.40(A))
|
https://2023.antflix.net#322.40(A)
|
Chapter 3 Wiring Methods and Materials
|
322.40(B)
|
Luminaire hangers installed with the flat cable assemblies shall be identified for the use. [322.40(B)](https://2023.antflix.net#322.40(B))
|
https://2023.antflix.net#322.40(B)
|
Chapter 3 Wiring Methods and Materials
|
322.40(C)
|
Fittings to be installed with flat cable assemblies shall be designed and installed to prevent physical damage to the cable assemblies. [322.40(C)](https://2023.antflix.net#322.40(C))
|
https://2023.antflix.net#322.40(C)
|
Chapter 3 Wiring Methods and Materials
|
322.40(D)
|
All extensions from flat cable assemblies shall be made by approved wiring methods, within the junction boxes, installed at either end of the flat cable assembly runs. [322.40(D)](https://2023.antflix.net#322.40(D))
|
https://2023.antflix.net#322.40(D)
|
Chapter 3 Wiring Methods and Materials
|
322.56(A)
|
Splices shall be made in listed junction boxes. [322.56(A)](https://2023.antflix.net#322.56(A))
|
https://2023.antflix.net#322.56(A)
|
Chapter 3 Wiring Methods and Materials
|
322.56(B)
|
Taps shall be made between any phase conductor and the grounded conductor or any other phase conductor by means of devices and fittings identified for the use. Tap devices shall be rated at not less than 15 amperes, or more than 300 volts to ground, and shall be marked in accordance with 322.120(C). [322.56(B)](https://2023.antflix.net#322.56(B))
|
https://2023.antflix.net#322.56(B)
|
Chapter 3 Wiring Methods and Materials
|
322.100
|
Flat cable assemblies shall consist of two, three, four, or five conductors. [322.100](https://2023.antflix.net#322.100)
|
https://2023.antflix.net#322.100
|
Chapter 3 Wiring Methods and Materials
|
322.104
|
Flat cable assemblies shall have conductors of 10 AWG special stranded copper wires. [322.104](https://2023.antflix.net#322.104)
|
https://2023.antflix.net#322.104
|
Chapter 3 Wiring Methods and Materials
|
322.112
|
The entire flat cable assembly shall be formed to provide a suitable insulation covering all the conductors and using one of the materials recognized in Table 310.4(1) for general branch-circuit wiring. [322.112](https://2023.antflix.net#322.112)
|
https://2023.antflix.net#322.112
|
Chapter 3 Wiring Methods and Materials
|
322.120(A)
|
In addition to the provisions of 310.8, Type FC cable shall have the temperature rating durably marked on the surface at intervals not exceeding 600 mm (24 in.). [322.120(A)](https://2023.antflix.net#322.120(A))
|
https://2023.antflix.net#322.120(A)
|
Chapter 3 Wiring Methods and Materials
|
322.120(B)
|
The grounded conductor shall be identified throughout its length by means of a distinctive and durable white or gray marking. Informational Note: The color gray may have been used in the past as an ungrounded conductor. Care should be taken when working on existing systems. [322.120(B)](https://2023.antflix.net#322.120(B))
|
https://2023.antflix.net#322.120(B)
|
Chapter 3 Wiring Methods and Materials
|
322.120(C)
|
Terminal blocks identified for the use shall have distinctive and durable markings for color or word coding. The grounded conductor section shall have a white marking or other suitable designation. The next adjacent section of the terminal block shall have a black marking or other suitable designation. The next section shall have a red marking or other suitable designation. The final or outer section, opposite the grounded conductor section of the terminal block, shall have a blue marking or other suitable designation. [322.120(C)](https://2023.antflix.net#322.120(C))
|
https://2023.antflix.net#322.120(C)
|
Chapter 3 Wiring Methods and Materials
|
324.1
|
This article covers a field-installed wiring system for branch circuits incorporating Type FCC cable and associated accessories as defined by the article. The wiring system is designed for installation under carpet squares. [324.1](https://2023.antflix.net#324.1)
|
https://2023.antflix.net#324.1
|
Chapter 3 Wiring Methods and Materials
|
324.6
|
Type FCC cable and associated fittings shall be listed. [324.6](https://2023.antflix.net#324.6)
|
https://2023.antflix.net#324.6
|
Chapter 3 Wiring Methods and Materials
|
324.10(A)
|
Use of FCC systems shall be permitted both for general-purpose and appliance branch circuits and for individual branch circuits. [324.10(A)](https://2023.antflix.net#324.10(A))
|
https://2023.antflix.net#324.10(A)
|
Chapter 3 Wiring Methods and Materials
|
324.10(B)(1)
|
Voltage between ungrounded conductors shall not exceed 300 volts. Voltage between ungrounded conductors and the grounded conductor shall not exceed 150 volts. [324.10(B)(1)](https://2023.antflix.net#324.10(B)(1))
|
https://2023.antflix.net#324.10(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
324.10(B)(2)
|
General-purpose and appliance branch circuits shall have ratings not exceeding 20 amperes. Individual branch circuits shall have ratings not exceeding 30 amperes. [324.10(B)(2)](https://2023.antflix.net#324.10(B)(2))
|
https://2023.antflix.net#324.10(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
324.10(C)
|
Use of FCC systems shall be permitted on hard, sound, smooth, continuous floor surfaces made of concrete, ceramic, or composition flooring, wood, and similar materials. [324.10(C)](https://2023.antflix.net#324.10(C))
|
https://2023.antflix.net#324.10(C)
|
Chapter 3 Wiring Methods and Materials
|
324.10(D)
|
Use of FCC systems shall be permitted on wall surfaces in surface metal raceways. [324.10(D)](https://2023.antflix.net#324.10(D))
|
https://2023.antflix.net#324.10(D)
|
Chapter 3 Wiring Methods and Materials
|
324.10(E)
|
Use of FCC systems in damp locations shall be permitted. [324.10(E)](https://2023.antflix.net#324.10(E))
|
https://2023.antflix.net#324.10(E)
|
Chapter 3 Wiring Methods and Materials
|
324.10(F)
|
Materials used for floors heated in excess of 30°C (86°F) shall be identified as suitable for use at these temperatures. [324.10(F)](https://2023.antflix.net#324.10(F))
|
https://2023.antflix.net#324.10(F)
|
Chapter 3 Wiring Methods and Materials
|
324.10(G)
|
Any portion of an FCC system with a height above floor level exceeding 2.3 mm (0.090 in.) shall be tapered or feathered at the edges to floor level. [324.10(G)](https://2023.antflix.net#324.10(G))
|
https://2023.antflix.net#324.10(G)
|
Chapter 3 Wiring Methods and Materials
|
324.12
|
FCC systems shall not be used in the following locations: Outdoors or in wet locationsWhere subject to corrosive vaporsIn any hazardous (classified) locationIn residential buildingsIn school and hospital buildings, other than administrative office areas [324.12](https://2023.antflix.net#324.12)
|
https://2023.antflix.net#324.12
|
Chapter 3 Wiring Methods and Materials
|
324.18
|
Crossings of more than two Type FCC cable runs shall not be permitted at any one point. Crossings of a Type FCC cable over or under a flat communications or signal cable shall be permitted. In each case, a grounded layer of metal shielding shall separate the two cables, and crossings of more than two flat cables shall not be permitted at any one point. [324.18](https://2023.antflix.net#324.18)
|
https://2023.antflix.net#324.18
|
Chapter 3 Wiring Methods and Materials
|
324.30
|
All FCC system components shall be firmly anchored to the floor or wall using an adhesive or mechanical anchoring system identified for this use. Floors shall be prepared to ensure adherence of the FCC system to the floor until the carpet squares are placed. [324.30](https://2023.antflix.net#324.30)
|
https://2023.antflix.net#324.30
|
Chapter 3 Wiring Methods and Materials
|
324.40(A)
|
All Type FCC cable connections shall use connectors identified for their use, installed such that electrical continuity, insulation, and sealing against dampness and liquid spillage are provided. All bare cable ends shall be insulated and sealed against dampness and liquid spillage using listed insulating ends. [324.40(A)](https://2023.antflix.net#324.40(A))
|
https://2023.antflix.net#324.40(A)
|
Chapter 3 Wiring Methods and Materials
|
324.40(B)
|
All receptacles and connections shall be constructed and installed so as to maintain proper polarization of the system. [324.40(B)](https://2023.antflix.net#324.40(B))
|
https://2023.antflix.net#324.40(B)
|
Chapter 3 Wiring Methods and Materials
|
324.40(C)(1)
|
A metal top shield shall be installed over all floor-mounted Type FCC cable, connectors, and insulating ends. The top shield shall completely cover all cable runs, corners, connectors, and ends. [324.40(C)(1)](https://2023.antflix.net#324.40(C)(1))
|
https://2023.antflix.net#324.40(C)(1)
|
Chapter 3 Wiring Methods and Materials
|
324.40(C)(2)
|
A bottom shield shall be installed beneath all Type FCC cable, connectors, and insulating ends. [324.40(C)(2)](https://2023.antflix.net#324.40(C)(2))
|
https://2023.antflix.net#324.40(C)(2)
|
Chapter 3 Wiring Methods and Materials
|
324.40(D)
|
Power feed, grounding connection, and shield system connection between the FCC system and other wiring systems shall be accomplished in a transition assembly identified for this use. [324.40(D)](https://2023.antflix.net#324.40(D))
|
https://2023.antflix.net#324.40(D)
|
Chapter 3 Wiring Methods and Materials
|
324.40(E)
|
Metal shields shall be connected to each other and to boxes, receptacle housings, self-contained devices, and transition assemblies using metal-shield connectors. [324.40(E)](https://2023.antflix.net#324.40(E))
|
https://2023.antflix.net#324.40(E)
|
Chapter 3 Wiring Methods and Materials
|
324.41
|
Floor-mounted Type FCC cable, cable connectors, and insulating ends shall be covered with carpet squares not larger than 1.0 m (39.37 in.) square. Carpet squares that are adhered to the floor shall be attached with release-type adhesives. [324.41](https://2023.antflix.net#324.41)
|
https://2023.antflix.net#324.41
|
Chapter 3 Wiring Methods and Materials
|
324.42(A)
|
All receptacles, receptacle housings, and self-contained devices used with the FCC system shall be identified for this use and shall be connected to the Type FCC cable and metal shields. Connection from any equipment grounding conductor of the Type FCC cable shall be made to the shield system at each receptacle. [324.42(A)](https://2023.antflix.net#324.42(A))
|
https://2023.antflix.net#324.42(A)
|
Chapter 3 Wiring Methods and Materials
|
324.42(B)
|
Receptacle housings and self-contained devices designed either for floor mounting or for in-wall or on-wall mounting shall be permitted for use with the FCC system. Receptacle housings and self-contained devices shall incorporate means for facilitating entry and termination of Type FCC cable and for electrically connecting the housing or device with the metal shield. Receptacles and self-contained devices shall comply with 406.4. Power and communications outlets installed together in common housing shall be permitted in accordance with 800.133(A)(3), Exception No. 2. [324.42(B)](https://2023.antflix.net#324.42(B))
|
https://2023.antflix.net#324.42(B)
|
Chapter 3 Wiring Methods and Materials
|
324.56(A)
|
Alterations to FCC systems shall be permitted. New cable connectors shall be used at new connection points to make alterations. It shall be permitted to leave unused cable runs and associated cable connectors in place and energized. All cable ends shall be covered with insulating ends. [324.56(A)](https://2023.antflix.net#324.56(A))
|
https://2023.antflix.net#324.56(A)
|
Chapter 3 Wiring Methods and Materials
|
324.56(B)
|
All transition assemblies shall be identified for their use. Each assembly shall incorporate means for facilitating entry of the Type FCC cable into the assembly, for connecting the Type FCC cable to grounded conductors, and for electrically connecting the assembly to the metal cable shields and to equipment grounding conductors. [324.56(B)](https://2023.antflix.net#324.56(B))
|
https://2023.antflix.net#324.56(B)
|
Chapter 3 Wiring Methods and Materials
|
324.60
|
All metal shields, boxes, receptacle housings, and self-contained devices shall be electrically continuous to the equipment grounding conductor of the supplying branch circuit. All such electrical connections shall be made with connectors identified for this use. The electrical resistivity of such shield system shall not be more than that of one conductor of the Type FCC cable used in the installation. [324.60](https://2023.antflix.net#324.60)
|
https://2023.antflix.net#324.60
|
Chapter 3 Wiring Methods and Materials
|
324.100(A)
|
Type FCC cable shall be listed for use with the FCC system and shall consist of three, four, or five flat copper conductors, one of which shall be an equipment grounding conductor. [324.100(A)](https://2023.antflix.net#324.100(A))
|
https://2023.antflix.net#324.100(A)
|
Chapter 3 Wiring Methods and Materials
|
324.100(B)(1)
|
All top and bottom shields shall be of designs and materials identified for their use. Top shields shall be metal. Both metallic and nonmetallic materials shall be permitted for bottom shields. [324.100(B)(1)](https://2023.antflix.net#324.100(B)(1))
|
https://2023.antflix.net#324.100(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
324.100(B)(2)
|
Metal shields shall have cross-sectional areas that provide for electrical resistivity of not more than that of one conductor of the Type FCC cable used in the installation. [324.100(B)(2)](https://2023.antflix.net#324.100(B)(2))
|
https://2023.antflix.net#324.100(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
324.101
|
Metal components of the system shall be either corrosion resistant, coated with corrosion-resistant materials, or insulated from contact with corrosive substances. [324.101](https://2023.antflix.net#324.101)
|
https://2023.antflix.net#324.101
|
Chapter 3 Wiring Methods and Materials
|
324.112
|
The insulating material of the cable shall be moisture resistant and flame retardant. All insulating materials in the FCC systems shall be identified for their use. [324.112](https://2023.antflix.net#324.112)
|
https://2023.antflix.net#324.112
|
Chapter 3 Wiring Methods and Materials
|
324.120(A)
|
Type FCC cable shall be clearly and durably marked on both sides at intervals of not more than 610 mm (24 in.) with the information required by 310.8(A) and with the following additional information: Material of conductorsMaximum temperature ratingAmpacity [324.120(A)](https://2023.antflix.net#324.120(A))
|
https://2023.antflix.net#324.120(A)
|
Chapter 3 Wiring Methods and Materials
|
324.120(B)
|
Conductors shall be clearly and durably identified on both sides throughout their length as specified in 310.6. [324.120(B)](https://2023.antflix.net#324.120(B))
|
https://2023.antflix.net#324.120(B)
|
Chapter 3 Wiring Methods and Materials
|
326.1
|
This article covers the use, installation, and construction specifications for integrated gas spacer cable, Type IGS. [326.1](https://2023.antflix.net#326.1)
|
https://2023.antflix.net#326.1
|
Chapter 3 Wiring Methods and Materials
|
326.10
|
Type IGS cable shall be permitted for use underground, including direct burial in the earth, as the following: Service-entrance conductorsFeeder or branch-circuit conductorsService conductors, underground [326.10](https://2023.antflix.net#326.10)
|
https://2023.antflix.net#326.10
|
Chapter 3 Wiring Methods and Materials
|
326.12
|
Type IGS cable shall not be used as interior wiring or be exposed in contact with buildings. [326.12](https://2023.antflix.net#326.12)
|
https://2023.antflix.net#326.12
|
Chapter 3 Wiring Methods and Materials
|
326.24
|
Where the coilable nonmetallic conduit and cable are bent for installation purposes or are flexed or bent during shipment or installation, the radius of the curve of the inner edge measured to the inside of the bend shall not be less than specified in Table 326.24. Table 326.24 Minimum Radii of Bends Conduit Size Minimum Radii Metric Designator Trade Size mm in. 53 2 600 24 78 3 900 35 103 4 1150 45 [326.24](https://2023.antflix.net#326.24)
|
https://2023.antflix.net#326.24
|
Chapter 3 Wiring Methods and Materials
|
326.26
|
A run of Type IGS cable between pull boxes or terminations shall not contain more than the equivalent of four quarter bends (360 degrees total), including those bends located immediately at the pull box or terminations. [326.26](https://2023.antflix.net#326.26)
|
https://2023.antflix.net#326.26
|
Chapter 3 Wiring Methods and Materials
|
326.40
|
Terminations and splices for Type IGS cable shall be identified as a type that is suitable for maintaining the gas pressure within the conduit. A valve and cap shall be provided for each length of the cable and conduit to check the gas pressure or to inject gas into the conduit. [326.40](https://2023.antflix.net#326.40)
|
https://2023.antflix.net#326.40
|
Chapter 3 Wiring Methods and Materials
|
326.80
|
The ampacity of Type IGS cable shall not exceed the values shown in Table 326.80. Table 326.80 Ampacity of Type IGS Cable Size (kcmil) Amperes Size (kcmil) Amperes 250 119 2500 376 500 168 3000 412 750 206 3250 429 1000 238 3500 445 1250 266 3750 461 1500 292 4000 476 1750 315 4250 491 2000 336 4500 505 2250 357 4750 519 [326.80](https://2023.antflix.net#326.80)
|
https://2023.antflix.net#326.80
|
Chapter 3 Wiring Methods and Materials
|
326.104
|
The conductors shall be solid aluminum rods, laid parallel, consisting of one to nineteen 12.7 mm (1/2 in.) diameter rods. The minimum conductor size shall be 250 kcmil, and the maximum size shall be 4750 kcmil. [326.104](https://2023.antflix.net#326.104)
|
https://2023.antflix.net#326.104
|
Chapter 3 Wiring Methods and Materials
|
326.112
|
The insulation shall be dry kraft paper tapes and a pressurized sulfur hexafluoride gas (SF6), both approved for electrical use. The nominal gas pressure shall be 138 kPa gauge (20 lb/in.2 gauge). The thickness of the paper spacer shall be as specified in Table 326.112. Table 326.112 Paper Spacer Thickness Size (kcmil) Thickness mm in. 250—1000 1.02 0.040 1250—4750 1.52 0.060 [326.112](https://2023.antflix.net#326.112)
|
https://2023.antflix.net#326.112
|
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