The following language shall be inserted as a new Article 560:
"560 Residential Occupancies
Part I. General
560.1 Scope. The special provisions of this section shall apply to the electrical installations in residential occupancies. In some cases they are repetitious and in some cases they are variations of general requirements appearing elsewhere in this Code.
560.2 Wiring Methods.
(A) Low-Voltage Class 2 Wiring. Low-voltage wiring for control or signaling, telephone systems, antenna systems, or communication systems which is enclosed in building partitions, walls or in any way made inaccessible by building construction need not be enclosed in a raceway except at locations where such wiring may be subject to mechanical injury.
Informational Note: Raceways when used will protect the conductors during construction and provide ready means for replacement of conductors after the building is completed. These raceways need not terminate in a box or fitting as long as normal precautions are taken to protect the conductors against injury.
(B) Other than Low-Voltage Class 2 Wiring. All wiring other than low-voltage class 2 wiring shall comply with the applicable provisions of Chapter 3.
560.3 Smoke Detectors and Carbon Monoxide Detectors.
Smoke detectors and carbon monoxide detectors shall be provided and installed in accordance with Chapter 13-64 of the Chicago Building Code.
Part II. Branch Circuits
560.4 General. Part II specifies the branch circuit, receptacle outlets, and lighting outlet requirements. Voltages for branch-circuit, receptacle outlets and lighting outlets shall be limited to those specified in 210.6.
Informational Note: See 210.12 and exceptions for arc-fault circuit-interrupter (AFCI) protection requirements.
560.5 Branch Circuit Requirements. Branch circuits for lighting and for appliances, including motor-operated appliances, shall be provided to supply the loads computed in accordance with 220.10. These circuits shall comply with the requirements of 210.25. In addition, branch circuits shall be provided for specific loads not covered by 220.10 where required elsewhere in this Code and for dwelling unit loads as specified in 560.5(A) through (F).
(A) Number of Branch Circuits. The minimum number of branch circuits shall be determined from the total computed load and the size or rating of the circuits used. In all installations, the number of circuits shall be sufficient to supply the load served. In no case shall the load on any circuit exceed the maximum specified by 220.18.
(B) Small Appliance Branch Circuits. In addition to the number of branch circuits required by other parts of this section, two or more 20-ampere small-appliance branch circuits shall be provided for all receptacle outlets specified by 560.6(B).
(C) Laundry Branch Circuits. In addition to the number of branch circuits required by other parts of this section, at least one additional 20-ampere branch circuit shall be provided to supply the laundry receptacle outlet(s) required by 560.6(F). This circuit shall have no other outlets.
(D) Bathroom Branch Circuit. In addition to the number of branch circuits required by other parts of this section, at least one 120-volt, 20-ampere branch circuit shall be provided to supply the bathroom(s) receptacle outlet(s). This circuit shall have no other outlets.
(E) Garage Branch Circuits. In addition to the number of branch circuits required by other parts of this section, at least one 120-volt, 20-ampere branch circuit shall be installed to supply receptacle outlets in garages. This circuit shall have no other outlets.
Exception: This circuit shall be permitted to supply readily accessible outdoor receptacle outlets
Informational Note: See 422.12 for central heating equipment branch circuit requirements.
(F) Guest Rooms. Branch circuits shall be installed in accordance with 210.60.
560.6 Receptacle Outlet Requirements. This section provides requirements for 125-volt, 15- and 20-ampere receptacle outlets. The receptacles required by this section shall be in addition to any receptacle that is:
(1) Part of a luminaire or appliance, or
(2) Controlled by a wall switch in accordance with 210.70(A)(1), Exception No. 1, or
(3) Located within cabinets or cupboards, or
(4) Located more than 1.7 m (5-1/2 ft) above the floor
Permanently installed electric baseboard heaters equipped with factory-installed receptacle outlets or outlets provided as a separate assembly by the 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.
Informational Note No. 1: Listed baseboard heaters include instructions that may not permit their installation below receptacle outlets.
Informational Note No. 2: See 210.8(A) for ground-fault circuit-interrupter (GFCI) protection requirements.
(A) General Provisions. In every kitchen, family room, dining room, living room, parlor, library, den, sunroom, bedroom, recreation room, or similar room or area of dwelling units, receptacle outlets shall be installed in accordance with the general provisions specified in 560.6(A)(1) through (A)(4).
(1) Spacing. Receptacles shall be installed such that no point measured horizontally along the floor line of any wall space is more than 1.8 m (6 ft) from a receptacle outlet.
(2) Wall Space. As used in this section, a wall space shall include the following:
(1) Any space 600 mm (2 ft) or more in width (including space measured around corners) and 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 walls, excluding sliding panels
(3) The space afforded by fixed room dividers, such as freestanding bar-type counters or railings
(3) Floor Receptacles. Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets unless located within 450 mm (18 in.) of the wall.
(4) Countertop and Similar Work Surface Receptacle Outlets. Receptacles installed for countertop and similar work surfaces as specified in 560.6(C) shall not be considered as the receptacle outlets required by 560.6(A).
(B) Small Appliances.
(1) Receptacle Outlets Served. 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 560.5(C)(1) shall serve all wall and floor receptacle outlets covered by 560.6(A), all countertop outlets covered by 560.6(C), and receptacle outlets for refrigeration equipment.
Exception No. 1: In addition to the required receptacles specified by 560.6, switched receptacles supplied from a general-purpose branch circuit as defined in 560.7(A)(1), Exception No. 1, shall be permitted.
Exception No. 2: In addition to the required receptacles specified by 560.6, a receptacle outlet to serve a specific appliance shall be permitted to be supplied from an individual branch circuit rated 15 amperes or greater.
(2) No Other Outlets. The two or more small-appliance branch circuits specified in 560.6(B)(1) shall have no other outlets.
Exception No. 1: A receptacle installed solely for the electrical supply to and support of an electric clock in any of the rooms specified in 560.6(B)(1).
Exception No. 2: Receptacles installed to provide power for supplemental equipment and lighting on gas-fired ranges, ovens, or counter-mounted cooking units.
(3) Kitchen Receptacle Requirements. Receptacles installed in a kitchen to serve countertop surfaces shall be supplied by not fewer 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 560.6(B)(1). Additional small-appliance branch circuits shall be permitted to supply receptacle outlets in the kitchen and other rooms specified in 560.6(B)(1). No small- appliance branch circuit shall serve more than one kitchen.
(C) Countertops and Work Surfaces. 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 560.6(C)(1) through (C)(5).
(1) Wall Countertop and Work Surface. A receptacle outlet shall be installed at each wall countertop and work surface that is 300 mm (12 in.) or wider. Receptacle outlets shall be installed so that no point along the wall line is more than 600 mm (24 in.) measured horizontally from a receptacle outlet in that space.
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 560.6(C)(1).
Figure 560.6(c)(1) Determination of Area Behind a Range, Counter-Mounted Cooking Unit, or Sink
(2) Island Countertop Spaces. At least one receptacle shall be installed at each island countertop space with a long dimension of 600 mm (24 in.) or greater and a short dimension of 300 mm (12 in.) or greater.
(3) Peninsular Countertop Spaces. At least one receptacle outlet shall be installed at each peninsular countertop space with a long dimension of 24 in. or greater and a short dimension of 12 in. or greater. A peninsular countertop is measured from the connected perpendicular wall.
(4) Separate Spaces. Countertop spaces separated by rangetops, refrigerators, or sinks shall be considered as separate countertop spaces in applying the requirements of 560.6(C)(1). If 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 300 mm (12 in.), the range, counter-mounted cooking unit, or sink shall be considered to divide the countertop space into two separate countertop spaces. Each separate countertop space shall comply with the applicable requirements in 560.6(C).
(5) Receptacle Outlet Location. Receptacle outlets shall be located on or above, but not more than 500 mm (20 in.) above, the countertop or work surface. Receptacle outlet assemblies listed for use in countertops or work surfaces shall be permitted to be installed in countertops or work surfaces. Receptacle outlets rendered not readily accessible by appliances fastened in place, appliance garages, sinks, or rangetops as covered in 560.6(C)(1), Exception, or appliances occupying dedicated space shall not be considered as these required outlets.
Informational Note: See 406.5(E) and 406.5(G) for requirements for installation of receptacles in countertops and 406.5(F) and 406.5(G) for requirements for installations of receptacles in work surfaces.
Exception to (5): To comply with the following conditions (1) and (2), receptacle outlets shall be permitted to be mounted not more than 300 mm (12 in.) below the countertop or work surface. Receptacles mounted below a countertop or work surface in accordance with this exception shall not be located where the countertop or work surface extends more than 150 mm (6 in.) beyond its support base.
(1) Construction for the physically impaired
(2) On island and peninsular countertops where the countertop is flat across its entire surface (no backsplashes, dividers, etc.) and there are no means to mount a receptacle within 500 mm (20 in.) above the countertop, such as an overhead cabinet
(D) Bathrooms. At least one receptacle outlet shall be installed in bathrooms within 900 mm (3 ft) of the outside edge of each basin. The receptacle outlet shall be located on a wall or partition that is adjacent to the basin or basin countertop, located on the countertop, or installed on the side or face of the basin cabinet. In no case shall the receptacle be located more than 300 mm (12 in.) below the top of the basin or basin countertop. Receptacle outlet assemblies listed for use in countertops shall be permitted to be installed in the countertop
Informational Note: See 406.5(E) and 406.5(G) for requirements for installation of receptacles in countertops.
(E) Outdoor Outlets. Outdoor receptacle outlets shall be installed in accordance with 560.6(E)(1) through (E)(3).
Informational Note: See 210.8(A)(3).
(1) One-Family and Two-Family Dwellings. For a one-family dwelling and each unit of a two- family dwelling that is at grade level, at least one receptacle outlet readily accessible from grade and not more than 2.0 m (6-1/2 ft) above grade level shall be installed at the front and back of the dwelling.
(2) Multifamily Dwellings. For each dwelling unit of a multifamily dwelling where the dwelling unit is located at grade level and provided with individual exterior entrance/egress, at least one receptacle outlet readily accessible from grade and not more than 2.0 m (6-1/2 ft) above grade level shall be installed.
(3) Balconies, Decks, and Porches. Balconies, decks, and porches that are attached to the dwelling unit and are accessible from inside the dwelling unit shall have at least one receptacle outlet accessible from the balcony, deck, or porch. The receptacle shall not be located more than 2.0 m (6-1/2 ft) above the balcony, deck, or porch walking surface.
(F) Laundry Areas. In dwelling units, at least one receptacle outlet shall be installed in areas designated for the installation of laundry equipment.
Exception No. 1: A receptacle for laundry equipment shall not be required in a dwelling unit of a multifamily building where laundry facilities are provided on the premises for use all by all building occupants.
Exception No. 2: A receptacle for laundry equipment shall not be required in other than one-family dwellings where laundry facilities are not to be installed or permitted.
(G) Basements, Garages, and Accessory Buildings. For one- and two-family dwellings, at least one receptacle outlet shall be installed in the areas specified in 560.6(G)(1) through (3). These receptacles shall be in addition to receptacles required for specific equipment.
(1) Garages. In each garage at least one receptacle outlet shall be installed in each vehicle bay and not more than 1.7 m (5-1/2 ft) above the floor.
(2) Accessory Buildings. In each accessory building with electric power.
(3) Basements. In each separate unfinished portion of a basement
(H) Hallways. In dwelling units, hallways of 3.0 m (10 ft) or more in length shall have at least one receptacle outlet.
As used in this subsection, the hallway length shall be considered the length along the centerline of the hallway without passing through a doorway.
(I) Foyers. Foyers that are not part of a hallway in accordance with 560.6(H) and that have an area that is greater than 5.6 m2 (60 ft2) shall have a receptacle(s) located in each wall space 900 mm (3 ft) or more in width. Doorways, door side windows that extend to the floor, and similar openings shall not be considered wall space.
560.7 Lighting Outlets Required. Lighting outlets shall be installed where specified in 560.7(A), (B), and (C).
(A) Dwelling Units. In dwelling units, lighting outlets shall be installed in accordance with 560.7(A)(1), (A)(2), and (A)(3).
(1) Habitable Rooms. At least one wall switch-controlled lighting outlet shall be installed in every habitable room, kitchen, and bathroom.
Exception No. 1: In other than kitchens and bathrooms, one or more receptacles controlled by a wall switch shall be permitted in lieu of lighting outlets.
Exception No. 2: Lighting outlets shall be permitted to be controlled by occupancy sensors that are (1) in addition to wall switches or (2) located at a customary wall switch location and equipped with a manual override that will allow the sensor to function as a wall switch.
(2) Additional Locations. Additional lighting outlets shall be installed in accordance with the following:
(1) At least one wall switch-controlled lighting outlet shall be installed in hallways, stairways, and garages.
(2) For dwelling units, garages, at least one wall switch-controlled lighting outlet shall be installed to provide illumination on the exterior side of outdoor entrances or exits with grade level access. A vehicle door in a garage shall not be considered as an outdoor entrance or exit.
(3) Where one or more lighting outlet(s) 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 outlet(s) where the stairway between floor levels has six risers or more.
Exception to (A)(2)(1), (A)(2)(2), and (A)(2)(3): In hallways, in stairways, and at outdoor entrances, remote, central, or automatic control of lighting shall be permitted.
(4) Lighting outlets controlled in accordance with 560.7(A)(2)(3) shall not be controlled by the use of dimmer switches unless they provide the full range of dimming control at each location.
(5) At least one wall switch-controlled lighting outlet shall be installed in clothes closets over 2.3 m2 (25 ft2). Closet luminaires shall be permanently installed lighting outlets.
(6) At least one wall switch-controlled lighting outlet shall be installed over each sink or basin in a room or area that is greater than 5.95
m2 (64 ft2). Such lighting outlets shall be in addition to the general lighting outlets installed in the room or area.
(3) Storage or Equipment Spaces. For attics, underfloor spaces, utility rooms, and basements, at least one lighting outlet containing a switch or controlled by a wall switch shall be installed where these spaces are used for storage or contain equipment requiring servicing. 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.
(B) Emergency Systems. For multifamily dwelling units containing five or more units, in addition to the lighting outlets required in 560.7(A)(2), lighting outlets shall be installed in accordance with Article 700. The lighting outlets required to illuminate corridors and stairwells may be connected to a photocell located in the area to be illuminated if adequate natural illumination is present during daylight hours to illuminate those areas. Time clocks shall not be used. These emergency lights shall supplement normal lighting in stairwells and corridors.
High rise buildings containing dwelling units shall comply with 700.30 and 700.65.
Exception: On existing buildings not exceeding four stories in height containing only vertical stairwells (no corridors) all of the stairwell lights may be connected to the emergency service. Normal lighting will not be required in these stairwells.
Part III. Branch-Circuit, Feeder, and Service Calculations
560.8 Scope. 560.9 to 560.21 provide the requirements for computing branch-circuit, feeder, and service loads.
560.9 Calculations.
(A) Voltages. Unless other voltages are specified, for purposes of computing branch-circuit and feeder loads, nominal system voltages of 120, 120/240, 208Y/120, and 240 volts shall be used.
(B) Fractions of an Ampere. Except where computations result in a fraction of an ampere 0.5 or larger, such fractions shall be permitted to be dropped.
560.10 Computation of Branch Circuit Loads. Branch-circuit loads shall be computed as shown in (A) and (B) of this section.
(A) Lighting Load. A unit load of not less than 3VA shall constitute the minimum lighting load for each square foot of floor area. The floor area for each floor shall be computed from the outside dimensions of the building, dwelling unit, or other area involved. The computed floor area shall not include open porches, garages, or unused or unfinished spaces not adaptable for future use.
(B) Other Loads. The minimum load for each outlet for general-use receptacles and outlets not used for general illumination shall not be less than that computed in (1) through (5) of this subsection, the loads shown being based on nominal branch-circuit voltages.
(1) Specific Appliances or Loads. An outlet for a specific appliance or other load not covered in (2) through (5) of this subsection shall be computed based on the ampere rating of the appliance or load served.
(2) Electric Dryers and Household Electric Cooking Appliances. Load computations shall be permitted as specified in 560.18 for electric dryers and 560.19 for electric ranges and other cooking appliances.
(3) Motor Loads. Outlets for motor loads shall be computed in accordance with the requirements in 430.22 and 430.24 and Article 440.
(4) Recessed Lighting Fixtures. An outlet supplying recessed lighting fixture(s) shall be computed based on the maximum volt-ampere rating of the equipment and lamps for which the fixture(s) is rated.
(5) Dwelling Occupancies. In one-family, two-family, and multifamily dwellings and in guest rooms of hotels and motels, the outlets specified in (a), (b), and (c) of this subsection are included in the general lighting load calculations of 560.9. No additional load calculations shall be required for such outlets.
a. All general-use receptacle outlets of 20-ampere rating or less, including receptacles connected to the circuits in 560.5(C)(3).
b. The receptacle outlets specified in 560.6(E) and (G).
c. The lighting outlets specified in 560.7(A) and (B).
560.11 Maximum Loads. The total load shall not exceed the rating of the branch circuit and it shall not exceed the maximum loads specified in (A) through (C) of this section, under the conditions specified therein.
(A) Motor-Operated and Combination Loads. Where a circuit supplies only motor-operated loads, Article 430 shall apply. Where a circuit supplies only air-conditioning equipment, refrigerating equipment, or both, Article 440 shall apply. For circuits supplying loads consisting of motor-operated utilization equipment that is fastened in place and that has a motor larger than 1/8 hp in combination with other loads, the total computed load shall be based on 125 percent of the largest motor load plus the sum of the other loads.
(B) Inductive and LED Lighting Loads. For circuits supplying lighting units that have ballasts, transformers, autotransformers, or LED drivers, the computed load shall be based on the total ampere ratings of such units and not on the total watts of the lamps.
(C) Range Loads. It shall be permissible to apply demand factors for range loads in accordance with Table 220.55, including Note 4.
560.12 Computed Load of Feeders and Services. The computed load of a feeder or service shall not be less than the sum of the loads on the branch circuits supplied, as determined by 560.7 through 560.10 after any applicable demand factors permitted by 560.12 through 560.20 have been applied.
560.13 General Lighting. The demand factors specified in Table 560.12 shall apply to that portion of the total branch-circuit load computed for general illumination. They shall not be applied in determining the number of branch circuits for general illumination.
Table 560.13 Lighting Load Demand Factors
Type of Occupancy | Portion of Lighting Load to Which Demand Factor Applies (Volt-Amperes) | Demand Factor (%)
|
Dwelling units | First 3,000 at From 3,001 to 120,000 at Remainder over 120,000 at | 100 35 25 |
Hotels and motels including apartment houses without provision for cooking by tenants* | First 20,000 or less at Next 80,000 at Remainder over 100,000 at | 50 40 30 |
*The demand factors of this table shall not apply in the computed load of feeders or services supplying areas in hotels, and motels where the entire lighting is likely to be used at one time, as in ballrooms or dining rooms. | ||
560.14 Motors. Motor loads shall be computed in accordance with 430.22, 430.24, 430.25, and 430.26 and with 440.6 for hermetic refrigerant motor-compressors.
560.15 Fixed Electric Space Heating. Fixed electric space heating loads shall be computed at 100 percent of the total connected load; however, in no case shall a feeder or service load current rating be less than the rating of the largest branch circuit supplied.
Exception: Where reduced loading of the conductors results from units operating on duty-cycle, intermittently, or from all units not operating at one time, the authority having jurisdiction may grant permission for feeder conductors to have an ampacity less than 100 percent, provided the conductors have an ampacity for the load so determined.
560.16 Small Appliance and Laundry Loads.
(A) Small Appliance Circuit Load. In each dwelling unit, the load shall be computed at 1,500 volt- amperes for each 2-wire small-appliance branch circuit required by 560.5(C)(1). Where the load is subdivided through two or more feeders, the computed load for each shall include not less than 1,500 volt-amperes for each 2-wire small-appliance branch circuit. These loads shall be permitted to be included with general lighting load and subjected to the demand factors provided in Table 560.13.
Exception: The individual branch circuit permitted by 560.6(B)(1), Exception No. 2 shall be permitted to be excluded from the calculation required by 560.16.
(B) Laundry Circuit Load. A load of not less than 1,500 volt-amperes shall be included for each 2-wire laundry branch circuit installed as required by 560.5(C)(2). This load shall be permitted to be included with the general lighting load and subjected to the demand factors provided in Table 560.13.
560.17 Appliance Load. It shall be permissible to apply a demand factor of 75 percent to the nameplate rating load of four or more appliances fastened in place, other than electric ranges, clothes dryers, space-heating equipment, or air-conditioning equipment, that are served by the same feeder or service in a one-family, two- family, or multifamily dwelling.
560.18 Electric Clothes Dryers. The load for household electric clothes dryers in a dwelling unit(s) shall be 5,000 watts (volt-amperes) or the nameplate rating, whichever is larger, for each dryer served. The use of the demand factors in Table 220.54 shall be permitted. Where two or more single-phase dryers are supplied by a 3-phase, 4-wire feeder or service, the total load shall be computed on the basis of twice the maximum number connected between any two phases. Kilovolt-amperes (kVA) shall be considered equivalent to kilowatts (kW) for loads computed in this section.
560.19 Electric Ranges and Other Cooking Appliances. The demand load for household electric ranges, wall- mounted ovens, counter-mounted cooking units, and other household cooking appliances individually rated in excess of 1-3/4 kW shall be permitted to be computed in accordance with Table 220.55. Kilovolt-amperes (kVA) shall be considered equivalent to kilowatts (kW) for loads computed in this section.
Where two or more single-phase ranges are supplied by a 3-phase, 4-wire feeder or service, the total load shall be computed on the basis of twice the maximum number connected between any two phases.
560.20 Noncoincident Loads. Where it is unlikely that two dissimilar loads will be in use simultaneously, it shall be permissible to omit the smaller of the two loads(s) in computing the total load of a feeder or service.
560.21 Feeder or Service Neutral Load.
(A) Basic Calculation. The feeder or service neutral load shall be the maximum unbalance of the load determined by this article. The maximum unbalanced load shall be the maximum net calculated load between the neutral conductor and any one ungrounded conductor.
Exception: For 3-wire, 2-phase or 5-wire, 2-phase systems, the maximum unbalanced load shall be the maximum net calculated load between the neutral conductor and any one ungrounded conductor multiplied by 140 percent.
(B) Permitted Reductions. A service or feeder supplying the following loads shall be permitted to have an additional demand factor of 70 percent applied to the amount in 560.21(B)(1) or portion of the amount in 560.21(B)(2) determined by the following basic calculations:
(1) A feeder or service supplying household electric ranges, wall-mounted ovens, counter-mounted cooking units, and electric dryers, where the maximum unbalanced load has been determined in accordance with Table 220.55 for ranges and Table 220.54 for dryers
(2) That portion of the unbalanced load in excess of 200 amperes where the feeder or service is supplied from a 3-wire dc or single-phase ac system; or a 4-wire, 3-phase system; or a 3-wire, 2-phase system; or a 5-wire, 2-phase system
(C) Prohibited Reductions. There shall be no reduction of the neutral or grounded conductor capacity applied to the amount in 560.21(C)(1), or portion of the amount in (C)(2), from that determined by the basic calculation:
(1) Any portion of a 3-wire circuit consisting of 2 ungrounded conductors and the neutral conductor of a 4-wire, 3-phase, wye-connected system
(2) That portion consisting of nonlinear loads supplied from a 4-wire, wye-connected, 3-phase system
Informational Note: A 3-phase, 4-wire, wye-connected power system used to supply power to nonlinear loads may necessitate that the power system design allow for the possibility of high harmonic neutral-conductor currents
Part IV. Services and Service Disconnecting Means
560.22 Services and Service-Entrance Conductors.
(A) General. Services shall comply with the requirements of Article 230.
(B) Size and Rating of Service Conductors.
(1) General. The ampacity of the service-entrance conductors before the application of any adjustment or correction factors, shall not be less than either (a) or (b) of this subsection. Loads shall be calculated in accordance with Article 220. Allowable ampacity shall be determined from Article 310.
(2) Continuous and Noncontinuous Loads. Continuous and noncontinuous loads shall be calculated in accordance with either (a) or (b) below.
(a) The sum of the noncontinuous loads plus 125% of continuous loads.
(b) The sum of the noncontinuous load plus the continuous load if the service entrance conductors terminate in an overcurrent device that is listed for operations at 100% of its rating.
(3) Ungrounded Conductors. Ungrounded conductors shall have an ampacity of not less than the minimum rating of the disconnecting means specified in 230.79.
(4) Grounded Conductors. The grounded conductor shall not be less than the minimum size as required by 250.24(B). Grounded conductors shall be the same size as the ungrounded conductors for all services up to and including 400 amperes.
560.23 Service Disconnecting Means.
(A) General. Means shall be provided to disconnect all conductors from the service-entrance conductors.
(B) Location. The service disconnecting means shall be installed in accordance with 560.23(B)(1), (B)(2), and (B)(3),(A)(4), and (A)(5).
(1) One- and Two-Family Dwellings. In one- and two-family dwellings the service disconnecting means shall be installed at a readily accessible location in the basement or first floor of the building at a point not exceeding 1.52 m (5 ft) from the point of entry into the building. When the length of the service raceway exceeds 1.52 m (5 ft) from the point of entry into the building, the service raceway shall conform to the requirements of 230.6.
(2) In Other Than One- and Two-Family Dwellings. In other than one- and two-family dwellings, the service disconnecting means shall be installed at a readily accessible location either outside of the building or structure or inside the building or structure nearest the point of entrance of the service conductors. When the length of the service raceway exceeds 1.52 m (5 ft) from the point of entry into the building, the service raceway shall conform to the requirements of 230.6.
(3) Bathrooms. Service disconnecting means shall not be installed in bathrooms.
(4) Remote Control. Where a remote control device(s) is used to actuate the service disconnecting means, the service disconnecting means shall be located in accordance with 230.70(A)(1).
(5) High Rise Buildings. In high rise buildings and other similar buildings of large area, the disconnecting means for the multiple services recognized by 230.2(B)(2) shall be located in a dedicated fire-rated room as near as practical to the serving utility vault.
The rooms for the "main" service disconnecting means which serve the building common element loads shall have a 3-hour fire rating. The electrical service rooms for tenant loads shall have a 2-hour minimum fire rating. These rooms shall be for the exclusive use of electrical equipment.
Where more than one service is permitted to serve one floor, the various disconnecting means and their locations shall be prominently identified as required by 230.2(E).
(6) Multiple Occupancy Buildings. Each occupant shall have access to the occupant’s service disconnecting means. In a multiple occupancy building supplied by a single service with a common accessible space available, the disconnecting means may consist of no more than six switches which shall be in accordance with the requirements of 230.71.
(C) Marking. Each service disconnect shall be permanently marked to identify it as a service disconnect.
(D) Rating of Service Disconnecting Means. The service disconnecting means shall have a rating not less than the load to be carried, determined in accordance with Article 220. In no case shall the rating be lower than specified in (1), (2), (3), or (4) of this subsection.
(1) One-Circuit Installation. For installations to supply only limited loads of a single branch circuit, the service disconnecting means shall have a rating of not less than 15 amperes.
(2) Two-Circuit Installations. For installations consisting of not more than two 2-wire branch circuits, the service disconnecting means shall have a rating of not less than 30 amperes.
(3) One-Family Dwelling. For a one-family dwelling, the service disconnecting means shall have a rating of not less than 100 amperes, 3-wire.
(4) All Others. For all other installations, the service disconnecting means shall have a rating of not less than 60 amperes.
560.24 Metering. Where a current supply is separately metered as in an apartment building, each such separately metered load shall be equipped with a meter disconnecting means which will disconnect the separately meter load from its source of supply. Such disconnect(s) shall conform to provisions of Part VI of Article 230.
Meters and disconnects shall be grouped and shall be located in meter closets if they are not installed in the basement. In all cases, the meter disconnect shall be immediately adjacent to its own meter. However where six or fewer meters are installed outside the building the foregoing provisions shall not apply, and in such cases the meter disconnects shall be installed in accordance with 560.23."
(Amend Coun. J. 11-8-17, p. 59720, § 22)