ADOPTS WITH AMENDMENTS:

International Residential Code 2018 (IRC 2018)

Part IV Energy Conservation

Part V Mechanical

Part VI Fuel Gas

Part VII Plumbing

Part VIII Electrical

Heads up: There are no amended sections in this chapter.

Outlets for receptacles rated at 125 volts, 15- and 20-amperes shall be provided in accordance with Sections E3901.2 through E3901.11. Receptacle outlets required by this section shall be in addition to any receptacle that is:

  1. Part of a luminaire or appliance;
  2. Located within cabinets or cupboards;
  3. Controlled by a wall switch in accordance with Section E3903.2, Exception 1; or
  4. Located over 5.5 feet (1676 mm) above the floor.

Permanently installed electric baseboard heaters equipped with factory-installed receptacle outlets, or outlets provided as a separate assembly by the baseboard manufacturer shall be permitted as the required outlet or outlets for the wall space utilized by such permanently installed heaters. Such receptacle outlets shall not be connected to the heater circuits. (210.52)

In every kitchen, family room, dining room, living room, parlor, library, den, sun room, bedroom, recreation room, or similar room or area of dwelling units, receptacle outlets shall be installed in accordance with the general provisions specified in Sections E3901.2.1 through E3901.2.3 (see Figure E3901.2).

For SI: 1 foot = 304.8 mm.

FIGURE E3901.2

 GENERAL USE RECEPTACLE DISTRIBUTION

Receptacles shall be installed so that no point measured horizontally along the floor line of any wall space is more than 6 feet (1829 mm), from a receptacle outlet. [210.52(A)(1)]

As used in this section, a wall space shall include the following: [210.52(A)(2)]

  1. Any space that is 2 feet (610 mm) or more in width, including space measured around corners, and that is unbroken along the floor line by doorways and similar openings, fireplaces, and fixed cabinets that do not have countertops or similar work surfaces.
  2. The space occupied by fixed panels in exterior walls, excluding sliding panels.
  3. The space created by fixed room dividers such as railings and freestanding bar-type counters.
Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets except where located within 18 inches (457 mm) of the wall. [210.52(A)(3)]
Receptacles installed for countertop and similar work surfaces as specified in Section E3901.4 shall not be considered as the receptacle outlets required by Section E3901.2. [210.52(A)(4)]

In the kitchen, pantry, breakfast room, dining room, or similar area of a dwelling unit, the two or more 20-ampere small-appliance branch circuits required by Section E3703.2, shall serve all wall and floor receptacle outlets covered by Sections E3901.2 and E3901.4 and those receptacle outlets provided for refrigeration appliances. [210.52(B)(1)]

Exceptions:

  1. In addition to the required receptacles specified by Sections E3901.1 and E3901.2, switched receptacles supplied from a general-purpose branch circuit as defined in Section E3903.2, Exception 1 shall be permitted. [210.52(B)(1) Exception No. 1]
  2. In addition to the required receptacles specified by Section E3901.2, a receptacle outlet to serve a specific appliance shall be permitted to be supplied from an individual branch circuit rated at 15 amperes or greater. [210.52(B)(1) Exception No. 2]

The two or more small-appliance branch circuits specified in Section E3901.3 shall serve no other outlets. [210.52(B)(2)]

Exceptions:

  1. A receptacle installed solely for the electrical supply to and support of an electric clock in any of the rooms specified in Section E3901.3. [210.52(B)(2) Exception No.1]
  2. Receptacles installed to provide power for supplemental equipment and lighting on gas-fired ranges, ovens, and counter-mounted cooking units. [210.52(B)(2) Exception No. 2]
Receptacles installed in a kitchen to serve countertop surfaces shall be supplied by not less than two small-appliance branch circuits, either or both of which shall also be permitted to supply receptacle outlets in the same kitchen and in other rooms specified in Section E3901.3. Additional small-appliance branch circuits shall be permitted to supply receptacle outlets in the kitchen and other rooms specified in Section E3901.3. A small-appliance branch circuit shall not serve more than one kitchen. [210.52(B)(3)]

In kitchens pantries, breakfast rooms, dining rooms and similar areas of dwelling units, receptacle outlets for countertop and work surfaces shall be installed in accordance with Sections E3901.4.1 through E3901.4.5 (see Figure E3901.4). [210.52(C)]

For SI: 1 foot = 304.8 mm.

FIGURE E3901.4

 COUNTERTOP RECEPTACLES

A receptacle outlet shall be installed at each wall countertop and work surface that is 12 inches (305 mm) or wider. Receptacle outlets shall be installed so that no point along the wall line is more than 24 inches (610 mm), measured horizontally, from a receptacle outlet in that space. [210.52(C)(1)]

Exception: Receptacle outlets shall not be required on a wall directly behind a range, counter-mounted cooking unit or sink in the installation described in Figure E3901.4.1. [210.52(C)(1) Exception]

Sink, range or counter-mounted cooking unit mounted in corner

For SI: 1 inch = 25.4 mm.

FIGURE E3901.4.1

 DETERMINATION OF AREA BEHIND SINK OR RANGE

At least one receptacle outlet shall be installed at each island countertop space with a long dimension of 24 inches (610 mm) or greater and a short dimension of 12 inches (305 mm) or greater. [210.52(C)(2)]
Not less than one receptacle outlet shall be installed at each peninsular countertop long dimension space having a long dimension of 24 inches (610 mm) or greater and a short dimension of 12 inches (305 mm) or greater. A peninsular countertop is measured from the connected perpendicular wall. [210.52(C)(3)]

Countertop spaces separated by range tops, refrigerators, or sinks shall be considered as separate countertop spaces in applying the requirements of Sections E3901.4.1, E3901.4.2 and E3901.4.3.

Where a range, counter-mounted cooking unit, or sink is installed in an island or peninsular countertop and the depth of the countertop behind the range, counter-mounted cooking unit, or sink is less than 12 inches (305 mm), the range, counter-mounted cooking unit, or sink has divided the countertop space into two separate countertop spaces as defined in Section E3901.4.4. Each separate countertop space shall comply with the applicable requirements of this section. [210.52(C)(4)]

Receptacle outlets shall be located not more than 20 inches (508 mm) above the countertop or work surface. Receptacle outlet assemblies installed in countertops and work surfaces shall be listed for use in countertops or work surfaces. Receptacle outlets rendered not readily accessible by appliances fastened in place, appliance garages, sinks or rangetops as addressed in the exception to Section E3901.4.1, or appliances occupying dedicated space shall not be considered as these required outlets. [210.52(C)(5)]

Exception: Receptacle outlets shall be permitted to be mounted not more than 12 inches (305 mm) below the countertop or work surface in construction designed for the physically impaired and for island and peninsular countertops or work surface where the surface is flat across its entire surface and there are no means to mount a receptacle within 20 inches (508 mm) above the countertop, such as in an overhead cabinet. Receptacles mounted below the countertop or work surface in accordance with this exception shall not be located where the countertop or work surface extends more than 6 inches (152 mm) beyond its support base. [210.52(C)(5) Exception]

Appliance receptacle outlets installed for specific appliances, such as laundry equipment, shall be installed within 6 feet (1829 mm) of the intended location of the appliance. (210.50(C)]

At least one receptacle outlet shall be installed in bathrooms and such outlet shall be located within 36 inches (914 mm) of the outside edge of each lavatory basin. The receptacle outlet shall be located on a wall or partition that is adjacent to the lavatory basin location, located on the countertop, or installed on the side or face of the basin cabinet. The receptacle shall be located not more than 12 inches (305 mm) below the top of the basin or basin countertop.

Receptacle outlet assemblies installed in countertops shall be listed for the application. [210.52(D)]

Not less than one receptacle outlet that is readily accessible from grade level and located not more than 6 feet, 6 inches (1981 mm) above grade, shall be installed outdoors at the front and back of each dwelling unit having direct access to grade level. Balconies, decks, and porches that are accessible from inside of the dwelling unit shall have at least one receptacle outlet accessible from the balcony, deck, or porch. The receptacle shall be located not more than 6 feet, 6 inches (1981 mm) above the balcony, deck, or porch surface. [210.52(E)]
Not less than one receptacle outlet shall be installed in areas designated for the installation of laundry equipment.
Not less than one receptacle outlet, in addition to any provided for specific equipment, shall be installed in each separate unfinished portion of a basement; in each vehicle bay not more than 5.5 feet (1676 mm) above the floor in attached garages; in each vehicle bay not more than 5.5 feet (1676 mm) above the floor in detached garages that are provided with electric power and in accessory buildings that are provided with electric power. [210.52(G)(1), (2), and (3)]
Hallways of 10 feet (3048 mm) or more in length shall have at least one receptacle outlet. The hall length shall be considered the length measured along the centerline of the hall without passing through a doorway. [210.52(H)]
Foyers that are not part of a hallway in accordance with Section E3901.10 and that have an area that is greater than 60 square feet (5.57 m2) shall have a receptacle(s) located in each wall space that is 3 feet (914 mm) or more in width. Doorways, door-side windows that extend to the floor, and similar openings shall not be considered as wall space. [210.52(H)]

A 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be installed at an accessible location for the servicing of heating, air-conditioning and refrigeration equipment. The receptacle shall be located on the same level and within 25 feet (7620 mm) of the heating, air-conditioning and refrigeration equipment. The receptacle outlet shall not be connected to the load side of the HVAC equipment disconnecting means. (210.63)

Exception: A receptacle outlet shall not be required for the servicing of evaporative coolers. (210.63 Exception)

125-volt, single-phase, 15-and 20-ampere receptacles installed in bathrooms shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(1)]
125-volt, single-phase, 15- or 20-ampere receptacles installed in garages and grade-level portions of unfinished accessory buildings used for storage or work areas shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(2)]

125-volt, single-phase, 15-and 20-ampere receptacles installed outdoors shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(3)]

Exception: Receptacles as covered in Section E4101.7. [210.8(A)(3) Exception]

Where a crawl space is at or below grade level, 125-volt, single-phase, 15- and 20-ampere receptacles installed in such spaces shall have ground-fault circuit-interrupter protection for personnel. Lighting outlets not exceeding 120 volts shall have ground-fault circuit-interrupter protection. [210.8(A)(4), 2108(E)]

125-volt, single-phase, 15- and 20-ampere receptacles installed in unfinished basements shall have ground-fault circuit-interrupter protection for personnel. For purposes of this section, unfinished basements are defined as portions or areas of the basement not intended as habitable rooms. [210.8(A)(5)]

Exception: A receptacle supplying only a permanently installed fire alarm or burglar alarm system. Receptacles installed in accordance with this exception shall not be considered as meeting the requirement of Section E3901.9. [210.8(A)(5) Exception]

125-volt, single-phase, 15-and 20-ampere receptacles that serve countertop surfaces shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(6)]
125-volt, single-phase, 15- and 20-ampere receptacles that are located within 6 feet (1829 mm) of the top inside edge of the bowl of the sink shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(7)]
125-volt, single phase, 15- and 20-ampere receptacles that are located within 6 feet (1829 mm) of the outside edge of a bathtub or shower stall shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(8)]
125-volt, single-phase, 15- and 20-ampere receptacles installed in laundry areas shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(9)]
Ground-fault circuit-interrupter protection shall be provided for outlets that supply dishwashers in dwelling unit locations. [210.8(D)]
125-volt, single-phase, 15- or 20-ampere receptacles installed in boathouses shall have ground-fault circuit-interrupter protection for personnel. [210.8(A)(8)]
Ground-fault circuit-interrupter protection for personnel shall be provided for 240-volt and less outlets that supply boat hoists. [210.8(C)]
Ground-fault circuit-interrupter protection for personnel shall be provided for electric heating cables embedded in concrete or poured masonry floors in bathrooms, kitchens and in hydromassage bathtub, spa and hot tub locations. Heating cables installed under floor coverings shall be provided with ground-fault circuit-interrupter protection for personnel. [424.44(E), 424.45(E)]
Ground-fault circuit interrupters shall be installed in a readily accessible location. When determining distance from receptacles, the distance shall be measured as the shortest path the cord of an appliance connected to the receptacle would follow without piercing a floor, wall, ceiling, or fixed barrier, or passing through a door, doorway or window. [210.8(A)]
Arc-fault circuit interrupters shall be installed in readily accessible locations.

Branch circuits that supply 120-volt, single phase, 15-ampere and 20-ampere outlets installed in kitchens, family rooms, dining rooms, living rooms, parlors, libraries dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas and similar rooms or areas shall be protected by any of the following:

  1. A listed combination-type arc-fault circuit interrupter installed to provide protection of the entire branch circuit.
  2. A listed branch/feeder-type AFCI installed at the origin of the branch-circuit in combination with a listed outlet branch-circuit type arc-fault circuit interrupter installed at the first outlet box on the branch circuit. The first outlet box in the branch circuit shall be marked to indicate that it is the first outlet of the circuit.
  3. A listed supplemental arc protection circuit breaker installed at the origin of the branch circuit in combination with a listed outlet branch-circuit type arc-fault circuit interrupter installed at the first outlet box on the branch circuit where all of the following conditions are met:

    3.1.  The branch-circuit wiring shall be continuous from the branch-circuit overcurrent device to the outlet branch-circuit arc-fault circuit interrupter.

    3.2.  The maximum length of the branch-circuit wiring from the branch-circuit overcurrent device to the first outlet shall not exceed 50 feet (15.2 m) for 14 AWG conductors and 70 feet (21.3 m) for 12 AWG conductors.

    3.3.  The first outlet box on the branch circuit shall be marked to indicate that it is the first outlet on the circuit.

  4. A listed outlet branch-circuit type arc-fault circuit interrupter installed at the first outlet on the branch circuit in combination with a listed branch-circuit overcurrent protective device where all of the following conditions are met:

    4.1.  The branch-circuit wiring shall be continuous from the branch-circuit overcurrent device to the outlet branch-circuit arc-fault circuit interrupter.

    4.2.  The maximum length of the branch-circuit wiring from the branch-circuit overcurrent device to the first outlet shall not exceed 50 feet (15.2 m) for 14 AWG conductors and 70 feet (21.3 m) for 12 AWG conductors.

    4.3.  The first outlet box on the branch circuit shall be marked to indicate that it is the first outlet on the circuit.

    4.4.  The combination of the branch-circuit overcurrent device and outlet branch-circuit AFCI shall be identified as meeting the requirements for a system combination-type AFCI and shall be listed as such.

  5. Where metal outlet boxes and junction boxes and RMC, IMC, EMT, Type MC or steel-armored Type AC cables meeting the requirements of Section E3908.8, metal wireways or metal auxiliary gutters are installed for the portion of the branch circuit between the branch-circuit overcurrent device and the first outlet, a listed branch-circuit type AFCI installed at the first outlet shall be considered as providing protection for the remaining portion of the branch circuit.
  6. Where a listed metal or nonmetallic conduit or tubing or Type MC cable is encased in not less than 2 inches (50.8 mm) of concrete for the portion of the branch circuit between the branch-circuit overcurrent device and the first outlet, a listed outlet branch-circuit type AFCI installed at the first outlet shall be considered as providing protection for the remaining portion of the branch circuit.

    Exceptions:

    1. AFCI protection is not required for an individual branch circuit supplying only a fire alarm system where the branch circuit is wired with metal outlet and junction boxes and RMC, IMC, EMT or steel-sheathed armored cable Type AC, or Type MC meeting the requirements of Section E3908.8.
    2. AFCI protection is not required where GFCI protection is required in accordance with E3902 and NEC 210.8(A).

Where branch-circuit wiring is modified, replaced, or extended in any of the areas specified in Section E3902.16, the branch circuit shall be protected by one of the following:

  1. A combination-type AFCI located at the origin of the branch circuit.
  2. An outlet branch-circuit type AFCI located at the first receptacle outlet of the existing branch circuit. [210.12(B)]

Exception: AFCI protection shall not be required where the extension of the existing conductors is not more than 6 feet (1.8 m) in length and does not include any additional outlets or devices. [210.12(B) Exception]

Lighting outlets shall be provided in accordance with Sections E3903.2 through E3903.4. [210.70(A)]

At least one wall switch-controlled lighting outlet shall be installed in every habitable room, kitchen and bathroom. [210.70(A)(1)]

Exceptions:

  1. In other than kitchens and bathrooms, one or more receptacles controlled by a wall switch shall be considered equivalent to the required lighting outlet. [210.70(A)(1) Exception No. 1]
  2. Lighting outlets shall be permitted to be controlled by occupancy sensors that are in addition to wall switches, or that are located at a customary wall switch location and equipped with a manual override that will allow the sensor to function as a wall switch. [210.70(A)(1) Exception No. 2]
At least one wall-switch-controlled lighting outlet shall be installed in hallways, stairways, attached garages, and detached garages with electric power. At least one wall-switch-controlled lighting outlet shall be installed to provide illumination on the exterior side of each outdoor egress door having grade level access, including outdoor egress doors for attached garages and detached garages with electric power. A vehicle door in a garage shall not be considered as an outdoor egress door.

Where one or more lighting outlets are installed for interior stairways, there shall be a wall switch at each floor level and landing level that includes an entryway to control the lighting outlets where the stairway between floor levels has six or more risers. Lighting outlets installed to meet this requirement shall not be controlled by the use of dimmer switches except where the dimmer switches provide the full range of dimming control at each switch location. [210.70(A)(2)]

Exception: In hallways, stairways, and at outdoor egress doors, remote, central, or automatic control of lighting shall be permitted. [210.70(A)(2) Exception]

In attics, under-floor spaces, utility rooms and basements, at least one lighting outlet shall be installed where these spaces are used for storage or contain equipment requiring servicing. Such lighting outlet shall be controlled by a wall switch or shall have an integral switch. At least one point of control shall be at the usual point of entry to these spaces. The lighting outlet shall be provided at or near the equipment requiring servicing. [210.70(A)(3)]

Metal raceways, cable armor and other metal enclosures for conductors shall be mechanically joined together into a continuous electric conductor and shall be connected to all boxes, fittings and cabinets so as to provide effective electrical continuity. Raceways and cable assemblies shall be mechanically secured to boxes, fittings cabinets and other enclosures. (300.10)

Exception: Short sections of raceway used to provide cable assemblies with support or protection against physical damage. (300.10 Exception No. 1)

Raceways, cable armors and cable sheaths shall be continuous between cabinets, boxes, fittings or other enclosures or outlets. (300.12)

Exception: Short sections of raceway used to provide cable assemblies with support or protection against physical damage. (300.12 Exception No. 1)

Raceways, cable assemblies, boxes, cabinets and fittings shall be securely fastened in place. (300.11)
Cable wiring methods shall not be used as a means of support for other cables, raceways and nonelectrical equipment. [300.11(D)]

Raceways shall be used as a means of support for other raceways, cables or nonelectric equipment only under the following conditions:

  1. Where the raceway or means of support is identified as a means of support; or
  2. Where the raceway contains power supply conductors for electrically controlled equipment and is used to support Class 2 circuit conductors or cables that are solely for the purpose of connection to the control circuits of the equipment served by such raceway; or
  3. Where the raceway is used to support boxes or conduit bodies in accordance with Sections E3906.8.4 and E3906.8.5. [300.11(C)]

Raceways shall be installed complete between outlet, junction or splicing points prior to the installation of conductors. (300.18)

Exception: Short sections of raceways used to contain conductors or cable assemblies for protection from physical damage shall not be required to be installed complete between outlet, junction, or splicing points. (300.18 Exception)

The maximum number of conductors installed in conduit or tubing shall be in accordance with Tables E3904.6(1) through E3904.6(10). (300.17, Chapter 9, Table 1 and Annex C)

TABLE E3904.6(1) (Annex C, Table C.1)

MAXIMUM NUMBER OF CONDUCTORS IN ELECTRICAL METALLIC TUBING (EMT)a

TYPE LETTERS CONDUCTOR SIZE AWG/kcmil TRADE SIZES (inches)
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 4 7 11 20 27 46
12 3 6 9 17 23 38
10 2 5 8 13 18 30
8 1 2 4 7 9 16
6 1 1 3 5 8 13
4 1 1 2 4 6 10
3 1 1 1 4 5 9
2 1 1 1 3 4 7
1 0 1 1 1 3 5
1/0 0 1 1 1 2 4
2/0 0 1 1 1 2 4
3/0 0 0 1 1 1 3
4/0 0 0 1 1 1 3
TW, THHW, THW, THW-2 14 8 15 25 43 58 96
12 6 11 19 33 45 74
10 5 8 14 24 33 55
8 2 5 8 13 18 30
RHHa, RHWa, RHW-2a 14 6 10 16 28 39 64
12 4 8 13 23 31 51
10 3 6 10 18 24 40
8 1 4 6 10 14 24
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 3 4 8 11 18
4 1 1 3 6 8 13
3 1 1 3 5 7 12
2 1 1 2 4 6 10
1 1 1 1 3 4 7
1/0 0 1 1 2 3 6
2/0 0 1 1 1 3 5
3/0 0 1 1 1 2 4
4/0 0 0 1 1 1 3
THHN, THWN, THWN-2 14 12 22 35 61 84 138
12 9 16 26 45 61 101
10 5 10 16 28 38 63
8 3 6 9 16 22 36
6 2 4 7 12 16 26
4 1 2 4 7 10 16
3 1 1 3 6 8 13
2 1 1 3 5 7 11
1 1 1 1 4 5 8
1/0 1 1 1 3 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 1 1 1 2 4
XHH, XHHW, XHHW-2 14 8 15 25 43 58 96
12 6 11 19 33 45 74
10 5 8 14 24 33 55
8 2 5 8 13 18 30
6 1 3 6 10 14 22
4 1 2 4 7 10 16
3 1 1 3 6 8 14
2 1 1 3 5 7 11
1 1 1 1 4 5 8
1/0 1 1 1 3 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 1 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(2) (Annex C, Table C.2)

MAXIMUM NUMBER OF CONDUCTORS IN ELECTRICAL NONMETALLIC TUBING (ENT)a

TYPE LETTERS CONDUCTOR SIZE TRADE SIZES (inches)
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 3 6 10 19 26 43
12 2 5 9 16 22 36
10 1 4 7 13 17 29
8 1 1 3 6 9 15
6 1 1 3 5 7 12
4 1 1 2 4 6 9
3 1 1 1 3 5 8
2 0 1 1 3 4 7
1 0 1 1 1 3 5
1/0 0 0 1 1 2 4
2/0 0 0 1 1 1 3
3/0 0 0 1 1 1 3
4/0 0 0 1 1 1 2
TW, THHW, THW, THW-2 14 7 13 22 40 55 92
12 5 10 17 31 42 71
10 4 7 13 23 32 52
8 1 4 7 13 17 29
RHHa, RHWa, RHW-2a 14 4 8 15 27 37 61
12 3 7 12 21 29 49
10 3 5 9 17 23 38
8 1 3 5 10 14 23
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 2 4 7 10 17
4 1 1 3 5 8 13
3 1 1 2 5 7 11
2 1 1 2 4 6 9
1 0 1 1 3 4 6
1/0 0 1 1 2 3 5
2/0 0 1 1 1 3 5
3/0 0 0 1 1 2 4
4/0 0 0 1 1 1 3
THHN, THWN, THWN-2 14 10 18 32 58 80 132
12 7 13 23 42 58 96
10 4 8 15 26 36 60
8 2 5 8 15 21 35
6 1 3 6 11 15 25
4 1 1 4 7 9 15
3 1 1 3 5 8 13
2 1 1 2 5 6 11
THHN, THWN, THWN-2 1 1 1 1 3 5 8
1/0 0 1 1 3 4 7
2/0 0 1 1 2 3 5
3/0 0 1 1 1 3 4
4/0 0 0 1 1 2 4
XHH, XHHW, XHHW-2 14 7 13 22 40 55 92
12 5 10 17 31 42 71
10 4 7 13 23 32 52
8 1 4 7 13 17 29
6 1 3 5 9 13 21
4 1 1 4 7 9 15
3 1 1 3 6 8 13
2 1 1 2 5 6 11
1 1 1 1 3 5 8
1/0 0 1 1 3 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 0 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(3) (Annex C, Table C.3)

MAXIMUM NUMBER OF CONDUCTORS IN FLEXIBLE METALLIC CONDUIT (FMC)a

TYPE LETTERS CONDUCTOR SIZE TRADE SIZES (inches)
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 3 7 11 17 25 44
12 3 6 9 14 21 37
10 14 5 7 11 17 30
8 2 4 6 9 15
6 1 1 3 5 7 12
4 1 1 2 4 5 10
3 1 1 1 3 5 7
2 1 1 1 3 4 7
1 0 1 1 1 2 5
1/0 0 1 1 1 2 4
2/0 0 1 1 1 1 3
3/0 0 0 1 1 1 3
TW, THHW, THW, THW-2 14 9 15 23 36 53 94
12 7 11 18 28 41 72
10 5 8 13 21 30 54
8 3 5 7 11 17 30
RHHa, RHWa, RHW-2a 14 6 10 15 24 35 62
12 5 8 12 19 28 50
10 4 6 10 15 22 39
8 1 4 6 9 13 23
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 3 4 7 10 18
4 1 1 3 5 7 13
3 1 1 3 4 6 11
2 1 1 2 4 5 10
1 1 1 1 2 4 7
1/0 0 1 1 1 3 6
2/0 0 1 1 1 3 5
3/0 0 1 1 1 2 4
4/0 0 0 1 1 1 3
4/0 0 0 1 1 1 2
THHN, THWN, THWN-2 14 13 22 33 52 76 134
12 9 16 24 38 56 98
10 6 10 15 24 35 62
8 3 6 9 14 20 35
THHN, THWN, THWN-2 6 2 4 6 10 14 25
4 1 2 4 6 9 16
3 1 1 3 5 7 13
2 1 1 3 4 6 11
1 1 1 1 3 4 8
1/0 1 1 1 2 4 7
2/0 0 1 1 1 3 6
3/0 0 1 1 1 2 5
4/0 0 1 1 1 1 4
XHH, XHHW, XHHW-2 14 9 15 23 36 53 94
12 7 11 18 28 41 72
10 5 8 13 21 30 54
8 3 5 7 11 17 30
6 1 3 5 8 12 22
4 1 2 4 6 9 16
3 1 1 3 5 7 13
2 1 1 3 4 6 11
1 1 1 1 3 5 8
1/0 1 1 1 2 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 1 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(4) (Annex C, Table C.4)

MAXIMUM NUMBER OF CONDUCTORS IN INTERMEDIATE METALLIC CONDUIT (IMC)a

TRADE SIZES (inches) TYPE LETTERS CONDUCTOR SIZE
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 4 8 13 22 30 49
12 4 6 11 18 25 41
10 3 5 8 15 20 33
8 1 3 4 8 10 17
6 1 1 3 6 8 14
4 1 1 3 5 6 11
3 1 1 2 4 6 9
2 1 1 1 3 5 8
1 0 1 1 2 3 5
1/0 0 1 1 1 3 4
2/0 0 1 1 1 2 4
3/0 0 0 1 1 1 3
4/0 0 0 1 1 1 3
TW, THHW, THW, THW-2 14 10 17 27 47 64 104
12 7 13 21 36 49 80
10 5 9 15 27 36 59
8 3 5 8 15 20 33
RHHa, RHWa, RHW-2a 14 6 11 18 31 42 69
12 5 9 14 25 34 56
10 4 7 11 19 26 43
8 2 4 7 12 16 26
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 3 5 9 12 20
4 1 2 4 6 9 15
3 1 1 3 6 8 13
2 1 1 3 5 6 11
1 1 1 1 3 4 7
1/0 1 1 1 3 4 6
2/0 0 1 1 2 3 5
3/0 0 1 1 1 3 4
4/0 0 1 1 1 2 4
THHN, THWN, THWN-2 14 14 24 39 68 91 149
12 10 17 29 49 67 109
10 6 11 18 31 42 68
8 3 6 10 18 24 39
6 2 4 7 13 17 28
4 1 3 4 8 10 17
3 1 2 4 6 9 15
2 1 1 3 5 7 12
1 1 1 2 4 5 9
1/0 1 1 1 3 4 8
2/0 1 1 1 3 4 6
THHN, THWN, THWN-2 3/0 0 1 1 2 3 5
2/0 0 1 1 1 2 4
XHH, XHHW, XHHW-2 14 10 17 27 47 64 104
12 7 13 21 36 49 80
10 5 9 15 27 36 59
8 3 5 8 15 20 33
6 1 4 6 11 15 24
4 1 3 4 8 11 18
3 1 2 4 7 9 15
2 1 1 3 5 7 12
1 1 1 2 4 5 9
1/0 1 1 1 3 5 8
2/0 1 1 1 3 4 6
3/0 0 1 1 2 3 5
4/0 0 1 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(5) (Annex C, Table C.5)

MAXIMUM NUMBER OF CONDUCTORS IN LIQUID-TIGHT FLEXIBLE NONMETALLIC CONDUIT (FNMC-B)a

TRADE SIZES (inches) TYPE LETTERS CONDUCTOR SIZE
3/8 1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 2 4 7 12 21 27 44
12 1 3 6 10 17 22 36
10 1 3 5 8 14 18 29
8 1 1 2 4 7 9 1
6 1 1 1 3 6 7 12
4 0 1 1 2 4 6 9
3 0 1 1 1 4 5 8
2 0 1 1 1 3 4 7
1 0 0 1 1 1 3 5
1/0 0 0 1 1 1 2 4
2/0 0 0 1 1 1 1 3
3/0 0 0 0 1 1 1 3
4/0 0 0 0 1 1 1 2
TW, THHW, THW, THW-2 14 5 9 15 25 44 57 93
12 4 7 12 19 33 43 71
10 3 5 9 14 25 32 53
8 1 3 5 8 14 18 29
RHHa, RHWa, RGW-2a 14 3 6 10 16 29 38 62
12 3 5 8 13 23 30 50
10 1 3 6 10 18 23 39
8 1 1 4 6 11 14 23
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 1 3 5 8 11 18
4 1 1 1 3 6 8 13
3 1 1 1 3 5 7 11
2 0 1 1 2 4 6 9
1 0 1 1 1 3 4 7
1/0 0 0 1 1 2 3 6
2/0 0 0 1 1 2 3 5
3/0 0 0 1 1 1 2 4
4/0 0 0 0 1 1 1 3
THHN, THWN, THWN-2 14 8 13 22 36 63 81 133
12 5 9 16 26 46 59 97
10 3 6 10 16 29 37 61
8 1 3 6 9 16 21 35
THHN, THWN, THWN-2 6 1 2 4 7 12 15 25
4 1 1 2 4 7 9 15
3 1 1 1 3 6 8 13
2 1 1 1 3 5 7 11
1 0 1 1 1 4 5 8
1/0 0 1 1 1 3 4 7
2/0 0 0 1 1 2 3 6
3/0 0 0 1 1 1 3 5
4/0 0 0 1 1 1 2 4
XHH, XHHW, XHHW-2 14 5 9 15 25 44 57 93
12 4 7 12 19 33 43 71
10 3 5 9 14 25 32 53
8 1 3 5 8 14 18 29
6 1 1 3 6 10 13 22
4 1 1 2 4 7 9 16
3 1 1 1 3 6 8 13
2 1 1 1 3 5 7 11
1 0 1 1 1 4 5 8
1/0 0 1 1 1 3 4 7
2/0 0 0 1 1 2 3 6
3/0 0 0 1 1 1 3 5
4/0 0 0 1 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(6) (Annex C, Table C.6)

MAXIMUM NUMBER OF CONDUCTORS IN LIQUID-TIGHT FLEXIBLE NONMETALLIC CONDUIT (FNMC-A)a

TYPE LETTERS CONDUCTOR SIZE AWG/kcmil TRADE SIZES (inches)
3/8 1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 2 4 7 11 20 27 45
12 1 3 6 9 17 23 38
10 1 3 5 8 13 18 30
8 1 1 2 4 7 9 16
6 1 1 1 3 5 7 13
4 0 1 1 2 4 6 10
3 0 1 1 1 4 5 8
2 0 1 1 1 3 4 7
1 0 0 1 1 1 3 5
1/0 0 0 1 1 1 2 4
2/0 0 0 1 1 1 1 4
3/0 0 0 0 1 1 1 3
4/0 0 0 0 1 1 1 3
TW, THHW, THW, THW-2 14 5 9 15 24 43 58 96
12 4 7 12 19 33 44 74
10 3 5 9 14 24 33 55
8 1 3 5 8 13 18 30
RHHa, RHWa, RHW-2a 14 3 6 10 16 28 38 64
12 3 4 8 13 23 31 51
10 1 3 6 10 18 24 40
8 1 1 4 6 10 14 24
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 1 3 4 8 11 18
4 1 1 1 3 6 8 13
3 1 1 1 3 5 7 11
2 0 1 1 2 4 6 10
1 0 1 1 1 3 4 7
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
1/0 0 0 1 1 2 3 6
2/0 0 0 1 1 1 3 5
3/0 0 0 1 1 1 2 4
4/0 0 0 0 1 1 1 3
THHN, THWN, THWN-2 14 8 13 22 35 62 83 137
12 5 9 16 25 45 60 100
10 3 6 10 16 28 38 63
8 1 3 6 9 16 22 36
6 1 2 4 6 12 16 26
4 1 1 2 4 7 9 16
3 1 1 1 3 6 8 13
2 1 1 1 3 5 7 11
1 0 1 1 1 4 5 8
1/0 0 1 1 1 3 4 7
2/0 0 0 1 1 2 3 6
3/0 0 0 1 1 1 3 5
4/0 0 0 1 1 1 2 4
XHH, XHHW, XHHW-2 14 5 9 15 24 43 58 96
12 4 7 12 19 33 44 74
10 3 5 9 14 24 33 55
8 1 3 5 8 13 18 30
6 1 1 3 5 10 13 22
4 1 1 2 4 7 10 16
3 1 1 1 3 6 8 14
2 1 1 1 3 5 7 11
1 0 1 1 1 4 5 8
XHH, XHHW, XHHW-2 1/0 0 1 1 1 3 4 7
2/0 0 0 1 1 2 3 6
3/0 0 0 1 1 1 3 5
4/0 0 0 1 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(7) (Annex C, Table C.7)

MAXIMUM NUMBER OF CONDUCTORS IN LIQUID-TIGHT FLEXIBLE METAL CONDUIT (LFMC)a

TYPE LETTERS CONDUCTOR SIZE AWG/kcmil TRADE SIZES (inches)
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 4 7 12 21 27 44
12 3 6 10 17 22 36
10 3 5 8 14 18 29
8 1 2 4 7 9 15
6 1 1 3 6 7 12
4 1 1 2 4 6 9
3 1 1 1 4 5 8
2 1 1 1 3 4 7
1 0 1 1 1 3 5
1/0 0 1 1 1 2 4
2/0 0 1 1 1 1 3
3/0 0 0 1 1 1 3
4/0 0 0 1 1 1 2
TW, THHW, THW, THW-2 14 9 15 25 44 57 93
12 7 12 19 33 43 71
10 5 9 14 25 32 53
8 3 5 8 14 18 29
RHHa, RHWa, RHW-2a, THHW, THW, THW-2 14 6 10 16 29 38 62
12 5 8 13 23 30 50
10 3 6 10 18 23 39
8 1 4 6 11 14 23
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 3 5 8 11 18
4 1 1 3 6 8 13
3 1 1 3 5 7 11
2 1 1 2 4 6 9
1 1 1 1 3 4 7
1/0 0 1 1 2 3 6
2/0 0 1 1 2 3 5
3/0 0 1 1 1 2 4
4/0 0 0 1 1 1 3
THHN, THWN, THWN-2 14 13 22 36 63 81 133
12 9 16 26 46 59 97
10 6 10 16 29 37 61
8 3 6 9 16 21 35
6 2 4 7 12 15 25
4 1 2 4 7 9 15
3 1 1 3 6 8 13
2 1 1 3 5 7 11
1 1 1 1 4 5 8
1/0 1 1 1 3 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 1 1 1 2 4
XHH, XHHW, XHHW-2 14 9 15 25 44 57 93
12 7 12 19 33 43 71
10 5 9 14 25 32 53
8 3 5 8 14 18 29
XHH, XHHW, XHHW-2 6 1 3 6 10 13 22
4 1 2 4 7 9 16
3 1 1 3 6 8 13
2 1 1 3 5 7 11
1 1 1 1 4 5 8
1/0 1 1 1 3 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 1 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(8) (Annex C, Table C.8)

MAXIMUM NUMBER OF CONDUCTORS IN RIGID METAL CONDUIT (RMC)a

TYPE LETTERS CONDUCTOR SIZE AWG/kcmil TRADE SIZES (inches)
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 4 7 12 21 28 46
12 3 6 10 17 23 38
10 3 5 8 14 19 31
8 1 2 4 7 10 16
6 1 1 3 6 8 13
4 1 1 2 4 6 10
3 1 1 2 4 5 9
2 1 1 1 3 4 7
1 0 1 1 1 3 5
1/0 0 1 1 1 2 4
2/0 0 1 1 1 2 4
3/0 0 0 1 1 1 3
4/0 0 0 1 1 1 3
TW, THHW, THW, THW-2 14 9 15 25 44 59 98
12 7 12 19 33 45 75
10 5 9 14 25 34 56
8 3 5 8 14 19 31
RHHa, RHWa, RHW-2a 14 6 10 17 29 39 65
12 5 8 13 23 32 52
10 3 6 10 18 25 41
8 1 4 6 11 15 24
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 3 5 8 11 18
4 1 1 3 6 8 14
3 1 1 3 5 7 12
2 1 1 2 4 6 10
1 1 1 1 3 4 7
1/0 0 1 1 2 3 6
2/0 0 1 1 2 3 5
3/0 0 1 1 1 2 4
4/0 0 0 1 1 1 3
THHN, THWN, THWN-2 14 13 22 36 63 85 140
12 9 16 26 46 62 102
10 6 10 17 29 39 64
8 3 6 9 16 22 37
6 2 4 7 12 16 27
4 1 2 4 7 10 16
3 1 1 3 6 8 14
2 1 1 3 5 7 11
1 1 1 1 4 5 8
THHN, THWN, THWN-2 1/0 1 1 1 3 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 1 1 1 2 4
XHH, XHHW, XHHW-2 14 9 15 25 44 59 98
12 7 12 19 33 45 75
10 5 9 14 25 34 56
8 3 5 8 14 19 31
6 1 3 6 10 14 23
4 1 2 4 7 10 16
3 1 1 3 6 8 14
2 1 1 3 5 7 12
1 1 1 1 4 5 9
1/0 1 1 1 3 4 7
2/0 0 1 1 2 3 6
3/0 0 1 1 1 3 5
4/0 0 1 1 1 2 4

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(9) (Annex C, Table C.9)

MAXIMUM NUMBER OF CONDUCTORS IN RIGID PVC CONDUIT, SCHEDULE 80 (PVC-80)a

TYPE LETTERS CONDUCTOR SIZE AWG/kcmil TRADE SIZES (inches)
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 3 5 9 17 23 39
12 2 4 7 14 19 32
10 1 3 6 11 15 26
8 1 1 3 6 8 13
6 1 1 2 4 6 11
4 1 1 1 3 5 8
3 0 1 1 3 4 7
2 0 1 1 3 4 6
1 0 1 1 1 2 4
1/0 0 0 1 1 1 3
2/0 0 0 1 1 1 3
3/0 0 0 1 1 1 3
4/0 0 0 0 1 1 2
TW, THHW, THW, THW-2 14 6 11 20 35 49 82
12 5 9 15 27 38 63
10 3 6 11 20 28 47
8 1 3 6 11 15 26
RHHa, RHWa, RHW-2a 14 4 8 13 23 32 55
12 3 6 10 19 26 44
10 2 5 8 15 20 34
8 1 3 5 9 12 20
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
6 1 1 3 7 9 16
4 1 1 3 5 7 12
3 1 1 2 4 6 10
2 1 1 1 3 5 8
1 0 1 1 2 3 6
1/0 0 1 1 1 3 5
RHHa, RHWa, RHW-2a,
TW, THW, THHW, THW-2
2/0 0 1 1 1 2 4
3/0 0 0 1 1 1 3
4/0 0 0 1 1 1 3
THHN, THWN, THWN-2 14 9 17 28 51 70 118
12 6 12 20 37 51 86
10 4 7 13 23 32 54
8 2 4 7 13 18 31
6 1 3 5 9 13 22
4 1 1 3 6 8 14
3 1 1 3 5 7 12
2 1 1 2 4 6 10
1 0 1 1 3 4 7
1/0 0 1 1 2 3 6
2/0 0 1 1 1 3 5
3/0 0 1 1 1 2 4
4/0 0 0 1 1 1 3
XHH, XHHW, XHHW-2 14 6 11 20 35 49 82
12 5 9 15 27 38 63
10 3 6 11 20 28 47
8 1 3 6 118 15 26
6 1 2 4 11 19
XHH, XHHW, XHHW-2 14 6 11 20 35 49 82
12 5 9 15 27 38 63
10 3 6 11 20 28 47
8 1 3 6 11 15 26
6 1 2 4 8 11 19
4 1 1 3 6 8 14
3 1 1 3 5 7 12
2 1 1 2 4 6 10
1 0 1 1 3 4 7
1/0 0 1 1 2 3 6
2/0 0 1 1 1 3 5
3/0 0 1 1 1 2 4
4/0 0 0 1 1 1 3

For SI: 1 inch = 25.4 mm.

  1. Types RHW, and RHW-2 without outer covering.

TABLE E3904.6(10) (Annex C, Table C.10)

MAXIMUM NUMBER OF CONDUCTORS IN RIGID PVC CONDUIT SCHEDULE 40 (PVC-40)a

TYPE LETTERS CONDUCTOR SIZE AWG/kcmil TRADE SIZES (inches)
1/2 3/4 1 11/4 11/2 2
RHH, RHW, RHW-2 14 4 7 11 20 27 45
12 3 5 9 16 22 37
10 2 4 7 13 18 30
8 1 2 4 7 9 15
6 1 1 3 5 7 12
4 1 1 2 4 6 10
3 1 1 1 4 5 8
2 1 1 1 3 4 7
1 0 1 1 1 3 5
1/0 0 1 1