WIRING AND PROTECTION

Municipal Code of Chicago tit. 14E, ch. 14E-2

in effect

Municipal Code of Chicago § 14E-2-200 Use and identification of grounded conductors.

14E-2-200 Use and identification of grounded conductors. The provisions of Article 200 of NFPA 70 are adopted by reference with the following modification: 1. Insert new subsection 200.5 to read: "Color Code of Grounded Branch Circuit and Grounded Feeder Circuit Conductors. Grounded branch circuit and grounded feeder circuit conductors shall be identified in accordance with either 200.5 (A) or (B), as applicable. (A) 150 Volts to Ground or Less. The grounded conductor of branch circuit and feeder conductors rated 150 volts to ground or less shall be identified by a continuous white outer finish. (B) Over 150 Volts to Ground. The grounded conductor of branch circuit and feeder conductors rated over 150 volts to ground shall be identified by a continuous gray outer finish."

Municipal Code of Chicago § 14E-2-210 Branch circuits.

14E-2-210 Branch circuits. The provisions of Article 210 of NFPA 70 are adopted by reference with the following modifications: 1. Revise subsection 210.5(C)(1) to read: "Branch Circuit Ungrounded Conductors. Branch circuit ungrounded conductors: (a) Rated 150 volts to ground or less shall use the following color code: black, red, and blue. (b) Rated over 150 volts to ground shall use the following color code: brown, orange, and yellow (c) On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, the high phase branch circuit conductor shall be durably and permanently marked by an outer finish that is orange in color." 2. Revise subsection 210.6(C) to read: "277 Volts to Ground. Circuits exceeding 120 volts, nominal, between conductors and not exceeding 277 volts, nominal, to ground shall be permitted to supply the following: (1) Listed electric-discharge or listed light-emitting diode-type luminaires where: (a) The luminaires shall be installed at least 2.44 m (8 ft) above the floor (b) the luminaires shall be permanently installed (c) switching shall be controlled by low voltage control relays or by listed circuit breakers used as switches and marked SWD or HID (2) Luminaires equipped with mogul-base screw shell lampholders that comply with 210.6(C)(1) requirements (3) Cord-and-plug-connected or permanently-connected utilization equipment" 3. Insert a new subsection 210.6(F) to read: "Regular Inspection and Maintenance. The owner of any building utilizing equipment at voltages exceeding 150 volts, nominal, to ground or distribution systems at voltages exceeding 600 volts, nominal, to ground shall employ a supervising electrician or contract with an electrical contractor for the regular inspection and maintenance of such equipment or distribution system." 4. Revise subsection 210.11 by inserting the following language before subsection (A): "Informational Note: See 210.12 and exceptions for arc-fault circuit-interrupter (AFCI) protection requirements." 5. Revise subsection 210.12 to read: "Arc-Fault Circuit-Interrupter Protection. Arc-fault circuit-interrupter protection shall be provided as required in 210.12(A), (B), and (C). The arc-fault circuit interrupter shall be installed in a readily accessible location. (A) Dwelling Units. All 120-volt, single phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in dwelling units shall be protected by a listed arc-fault circuit interrupter, combination-type, installed to provide protection of the branch circuit. (B) Dormitory Units. All 120-volt, single phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in dormitory units shall be protected as described in 210.12(A). (C) Guest Rooms and Guest Suites. All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in guest suites and guest rooms of hotels and motels shall be protected as described in 210.12(A). (D) Branch Circuit Extensions or Modifications – Dwelling Units and Dormitory Units. In any of the areas specified in 210.12(A) or (B), where branch-circuit wiring is modified, replaced or extended, the branch-circuit shall be protected by one of the following: (1) A listed combination-type AFCI located at the origin or the branch circuit. (2) A listed outlet branch-circuit type AFCI located at the first outlet of the existing branch circuit. Exception No. 1 to 210.12(A), (B), and (C): It shall be permitted to omit AFCI protection for that portion of the branch circuit enclosed in rigid metal conduit (RMC), flexible metal conduit (FMC), intermediate metal conduit (IMC), electrical metal tubing (EMT), or Type MI cable sheath meeting the requirements of 250.118 along with metal outlet and junction boxes. Exception No. 2 to 210.12(D): It shall be permitted to omit AFCI protection for that portion of the branch circuit installed in rigid metal conduit (RMC), flexible metal conduit (FMC), intermediate metal conduit (IMC), electrical metal tubing (EMT), or steel sheathed cable, Type AC, Type MC, or Type MI cable sheath, meeting the requirements of 250.118, with metal outlet and junction boxes. Exception No. 3 to 210.12(A), (B), (C) and (D): Where an individual branch circuit to a fire alarm system is installed in accordance with 760.41(B) or 760.121(B) is installed in rigid metal conduit (RMC), intermediate metal conduit (IMC), electrical metal tubing (EMT), or Type MI Cable sheath meeting the requirements of 250.118, with metal outlet and junction boxes, AFCI protection shall be permitted to be omitted. Informational Note No. 1: For information on types of arc-fault circuit interrupters, see UL 1699, Standard for Arc-Fault Circuit Interrupters. Informational Note No. 2: See 11.6.3(5) of NFPA 72, National Fire Alarm and Signaling Code, for information related to secondary power supply requirements for smoke alarms installed in dwelling units. Informational Note No. 3: See 760.41(B) and 760.121(B) for power-supply requirements for fire alarm systems." 6. Revise subsection 210.19(A) to read, with no changes to subsections (A)(2) to (A)(4): "Branch Circuits Not More Than 600 Volts. Informational Note No. 1: See 310.15 for ampacity ratings of conductors. Informational Note No. 2: See Part II of Article 430 for minimum rating of motor branch-circuit conductors. Informational Note No. 3: See 310.15(A)(3) for temperature limitation of conductors. Informational Note No. 4: See 215.2(A)(1) for voltage drop requirements on feeder conductors. (1) General. Branch-circuit conductors shall have an ampacity not less than the maximum load to be served. Conductors shall be sized to carry not less than the larger of 210.19(A)(1)(a) or (b). (a) Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor size shall have an allowable ampacity not less than the noncontinuous load plus 125 percent of the continuous load. (b) The minimum branch-circuit conductor size shall have an allowable ampacity not less than the maximum load to be served after the application of any adjustment or correction factors. Exception: If the assembly, including the overcurrent devices protecting the branch circuit(s), is listed for operation at 100 percent of its rating, the allowable ampacity of the branch-circuit conductors shall be permitted to be not less than the sum of the continuous load plus the noncontinuous load. Conductors for branch circuits, as defined in Article 100, shall be sized to prevent a voltage drop not to exceed 3 percent at the farthest outlet of power, heating, and lighting loads, or combinations of such loads, and so that the maximum total voltage drop on both feeders and branch circuits to the farthest outlet does not exceed 5 percent." 7. Revise subsection 210.19(B) to read: "Branch Circuits Over 600 Volts. The ampacity of conductors shall be in accordance with 310.15 and 310.60 as applicable. Branch-circuit conductors over 600 volts shall be sized in accordance with 210.19(B)(1). (1) General. The ampacity of branch-circuit conductors shall not be less than 125 percent of the designed potential load of utilization equipment that will be operated simultaneously." 8. Revise section 210.50 by deleting the informational note. 9. Insert new subsections 210.70(A)(2)(5) and (A)(2)(6) to read: "(5) At least one wall switch-controlled lighting outlet shall be installed in clothes closets and other 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 located 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." (Amend Coun. J. 11-8-17, p. 59720, § 11; Amend Coun. J. 1-23-19, p. 94952, Art. I, § 16)

Municipal Code of Chicago § 14E-2-215 Feeders.

14E-2-215 Feeders. The provisions of Article 215 of NFPA 70 are adopted by reference with the following modifications: 1. Revise subsection 215.2(A)(1)(b) to read: (b) The minimum feeder conductor size shall have an allowable ampacity not less than the maximum load to be served after the application of any adjustment or correction factors. Informational Note No. 1: See Examples D1 through D11 in Informative Annex D. Informational Note No. 2: See 210.19(A) for voltage drop requirements for branch circuits. Conductors for feeders, as defined in Article 100, shall be sized to prevent a voltage drop not to exceed 3 percent at the farthest outlet of power, heating, and lighting loads, or combinations of such loads, and so that the maximum total voltage drop on both feeders and branch circuits to the farthest outlet does not exceed 5 percent." 2. Revise section 215.5 to read: "Diagrams of Feeders. A diagram showing feeder details shall be provided to the authority having jurisdiction prior to the installation of the feeders in accordance with 215.5(A) and (B). (A) Plans Required. For new or altered electrical systems, complete and detailed electrical plans are required prior to permit issuance for the following installations: (1) Residential (Group R) occupancies in buildings greater than two stories in height (2) Non-residential occupancies in buildings greater than one story in height or greater than 929 m 2 (10,000 ft 2 ) in area (3) Hazardous (classified) locations (4) Health care facilities (5) New or replacement services or feeders rated 400 amperes or greater (6) New or replacement services or feeders exceeding 240 volts, nominal, to ground (7) Service switchboards and motor control centers rated in excess of 1200 amperes or 600 volts (8) Permanent generators (9) New emergency lighting systems and repairs or alterations to required System I or System II emergency lighting systems (10) Installation of electric vehicle supply equipment serving more than 3 parking spaces (B) Plan Content. The plans shall include where applicable, the following: (1) A single-line drawing of the service and distribution (2) Schedule of conduits, wire, switches, circuit breakers, overcurrent devices, transformers, motors and luminaires (3) Load calculations to verify sizes of services, feeders, and panelboards indicating available fault- current and withstand ratings (4) Grounding electrode conductor or common grounding electrode conductor system (5) Equipment layout in switchboard rooms and electrical closets indicating the working space required by 110.26" 3. Revise subsection 215.12(C)(1) to read: "(1) Feeder Ungrounded Conductors. Feeder ungrounded conductors: (a) Rated 150 volts to ground or less shall use the following color code: black, red, and blue. (b) Rated over 150 volts to ground shall use the following color code: brown, orange, and yellow. (c) On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, the high phase feeder conductor shall be durably and permanently marked by an outer finish that is orange in color." (Amend Coun. J. 11-8-17, p. 59720, § 12; Amend Coun. J. 12-14-22, p. 58278, Art. IV, § 1)

Municipal Code of Chicago § 14E-2-220 Branch circuits, feeders, and service calculations.

14E-2-220 Branch circuits, feeders, and service calculations. The provisions of Article 220 of NFPA 70 are adopted by reference without modification.

Municipal Code of Chicago § 14E-2-225 Outside branch circuits and feeders.

14E-2-225 Outside branch circuits and feeders. The provisions of Article 225 of NFPA 70 are adopted by reference with the following modifications: 1. Revise section 225.10 to read: "Wiring on Buildings (or Other Structures). The installation of outside wiring on surfaces of buildings (or other structures) shall be permitted for circuits of not over 1,000 volts, nominal, as the following: (1) Type MI cable (2) Rigid metal conduit (RMC) (3) Intermediate metal conduit (IMC) (4) Electrical metallic tubing (EMT) (5) Messenger-supported wiring." 2. Insert new Part IV to read: "Part IV. Outside Lighting 225.70. General. Part IV lists the requirements for outside lighting on public and private property that are in addition to the requirements of 225.7. 225.71. Commercial Lighting on Public Property. (A) Supports. Commercial lighting on public property shall be supported on a post erected to support the post under the worst expected conditions. Informational Note: For expected conditions in this area, see ANSI C2-2012, National Electrical Safety Code. (B) Location. Each post shall be installed so that the lower edge of the post shall be on a line with the upper edge of the street curb and the center of the post shall be not less than 557 mm (22 in.) from the outer edge of the curb. Where a number of posts are erected or where posts are erected in addition to existing posts, they shall be located so that the globes shall be in a line with each other. Exception: In the case of exceptionally narrow sidewalks or where large diameter pole bases are used, the 557 mm (22 in.) dimension may be reduced by the Department of Transportation. (C) Separation from Fire Hydrants. No post shall be erected closer than 1.5 m (5 ft) to a fire hydrant. (D) Street Corners. Posts erected at street corners shall not be located in the area defined by extending the building lines or right-of-way lines, if no building is present, to the curb. (E) Spacing. Where more than one post is installed or where posts are installed in the immediate vicinity of other posts, spacing in any block shall be uniform and not less than 12.2 m (40 ft) nor more than 15.2 m (50 ft). Exception: Where photometrics are acceptable to the Department of Transportation, a spacing greater than 15.2 m (50 ft) shall be permitted. 225.72. Commercial Lighting Foundations. All commercial lighting posts require concrete foundations. Concrete foundations shall be not less than 610 mm (24 in.) by 610 mm (24 in.) or 676 mm (27 in.) in diameter and shall extend below the frost line but not less than 914 mm (36 in.) below grade. Actual foundation dimensions shall be approved by the Department of Transportation. Exception: Where commercial lighting is installed on vaulted walks or areas, a foundation shall not be required. All such supports and designs shall be first approved by the Department of Transportation. 225.74. Attachment to Concrete Foundation. Posts attached to concrete foundations shall be attached by a method which will permit the removal of the post from its foundation without damage to the post or foundation. Where the method of fastening is by means of a spider extending outward from the post base, the top of the foundation before the post is installed shall be left 76 mm (3 in.) below the top surface of the walk. After the post has been aligned and fastened, the foundation shall be made flush with the top surface of the walk and no part of the spider or bolts shall project above the surface of the walk. In cases where posts are to be installed on unexcavated walk, the surface of the walk shall be recessed. (A) Posts Set on Concrete Foundations. Where posts are set on concrete foundations, they shall be attached by bolts extending into and firmly held by the concrete foundation for a distance of not less than 762 mm (30 in.) For concrete posts, there shall be a minimum of three bolts not less than 16 mm (5/8 in.) diameter. The bolts shall be set such that they shall not pull out of the concrete nor turn due to the screwing on of a nut. (B) Bolts. All bolts for attaching of posts shall be hot galvanized. 225.75. Concrete for Foundations. Concrete for foundations shall be made of at least 3,000 psi concrete mix with a minimum cement content of 470 lb/yd3 of concrete or shall be standard class SI concrete (IDOT Section 1020). Proper admixtures, such as air-entraining admixture (for concrete exposed to freezing and thawing) and water-reducing admixture (for placement and workability) shall be added to the concrete. Informational Note: The use of Ready-Mix Concrete per ASTM C94 is recommended. 225.76. Conductors and Wiring for Commercial Lighting on Public Property. Conductors outside of buildings for post lighting circuits shall be installed in rigid metal conduit, intermediate metal conduit or Schedule 80 nonmetallic rigid conduit a minimum of 610 mm (24 in.) beneath the surface of the ground, sidewalks, streets, alleys or parkways, or be enclosed by the post. Conductors within buildings shall be run in suitable conduits. (A) Conductors. Conductors shall consist of a two or three wire cable not smaller than 12 AWG and have an approved insulation. Conductors smaller than 8 AWG shall be supported by a messenger. (B) Protection Against Physical Damage. Conductors shall be protected from physical damage in accordance with 300.5. (C) Metallic Sheath. The metallic sheath of cables shall be grounded. (D) Disconnects. Branch circuits supplying street posts shall be protected by fuses rated not more than 20 amperes. (E) Splices. Splices shall be made within approved junction boxes inside of buildings and in post heads outside of buildings. 225.81. Supports. Commercial lighting on private property shall be supported on a post erected to support the post under the worst expected conditions. Informational Note No. 1: For expected conditions in this area, see ANSI C2-2012, National Electrical Safety Code. Informational Note No. 2: Planking the pole, "raking" the pole during installation, and similar methods of support should be considered during design. (A) Materials. Supports may be standard wood poles, metal poles if suitably protected against corrosion, or clear timber. Except in hazardous locations, metal poles shall be provided with a hand hole through which the connections to the branch circuits shall be permitted to be made. (B) Size and Strength. Minimum strength shall be equivalent to a Class 5 wood pole and in no case less than that required by 225.81. 225.82. Conductors and Wiring for Commercial Lighting on Public Property. Conductors shall consist of a two or three wire cable not smaller than 12 AWG and have an approved insulation. (A) Conductors Smaller than 8 AWG. Conductors smaller than 8 AWG shall be permitted to be a twisted pair or run parallel and taped. They shall be attached to and supported by a messenger at intervals not exceeding 1.52 m (5 ft). (B) Conductors 8 AWG or Larger. Conductors No. 8 or larger shall use standard strain insulators at supports. (C) Conductor Spans. Spans attached to buildings shall not exceed 30.5 m (100 ft) in length. Spans supported by clear timbers shall not exceed 18.2 m (60 ft) in length. (D) Messenger Wires. Messenger wires shall be galvanized and not smaller than 10 AWG. 225.83. Clearances for Commercial Lighting on Public Property. (A) From Ground or Grade. Conductors shall be installed in accordance with the clearance requirements of 225.18. (B) Feeder Wires. Feeder wires shall be separated by at least 305 mm (12 in.) and supported on approved insulators of glass or porcelain when not in conduit. 225.84. Disconnects for Commercial Lighting on Public Property. Cutouts and switches installed outdoors shall be in standard weatherproof cabinets. Cabinets installed with the bottom less than 2.44 m (8 ft) above grade shall be locked. 225.85. Connections. Connections in sockets or receptacles shall be of the standard molded "pigtail" weatherproof type. Connections of socket wires shall be staggered. 225.90. Underground Branch Circuits. Where branch circuit conductors are from an underground feed, the requirements of (A) and (B) of this section shall apply. (A) Underground Branch Circuits Attached to Wood Poles. Where rigid metal conduit or flexible metal conduit, where approved, is used it shall be installed a minimum of 2.44 m (8 ft) up the pole and to within 457 mm (18 in.) of the lighting fixture and made electrically continuous and grounded. Where cord is used it shall contain a separate grounding conductor which shall be continuous back to the distribution cabinet. (B) Underground Branch Circuits Attached to Metal Poles. Rigid metal conduit shall be stubbed through the below grade and fitted with a grounding type bushing. The pole shall be bonded to the conduit with a minimum 8 AWG wire. Where direct buried conductors or cable or non-metallic raceway is used, a separate grounding conductor shall be provided back to the distribution cabinet. Where rigid metal conduit is used, all segments of the raceway system shall be bonded together and shall be permitted to be used as the ground. 225.91. Disconnects for Metal Poles. Approved fuseholders shall be permitted to be installed in metal poles provided that they are accessible to qualified personnel only and there are no live parts exposed. 225.92. Voltages Permitted. Voltages permitted shall be as indicated in 220.5(A). Voltages in excess of 250 volts to ground or 300 volts between phase conductors shall be permitted to be used only when the following conditions are met: (1) The lighting shall be installed not less than 6.7 m (22 ft) above grade (2) Each pole, if of metal construction, shall be grounded by one of the approved methods (3) Disconnects shall be located within sight of the lights they control, outdoors, preferably on one of the poles (4) Where the installation is large or if the location of the lighting does not permit all the lighting to be within sight, more than one disconnect shall be permitted to be installed (5) Where snap-switches or push-button type switches are used, the voltage across these switches shall be reduced to less than 250 volts to ground or 300 volts between phase conductors (6) Branch circuits shall be limited to not more than 50 ampere rating (7) The electrical system shall be under the supervision of a supervising electrician."

Municipal Code of Chicago § 14E-2-230 Services.

14E-2-230 Services. The provisions of Article 230 of NFPA 70 are adopted by reference with the following modifications: 1. Revise subsection 230.30(B) to read: "Wiring Methods. Underground service conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following: (1) Type RMC conduit (2) Type IMC conduit (3) Type HDPE conduit (4) Type PVC conduit (5) Type RTRC conduit (6) Type USE conductors or cables identified for direct burial applications (7) Type MV cable identified for direct burial applications (8) Type MI cable, where suitably protected against physical damage and corrosive conditions" 2. Revise section 230.43 to read: "Wiring Methods for 1,000 Volts, Nominal, or Less. Service-entrance conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following methods: (1) Rigid metal conduit (2) Intermediate metal conduit (3) Service-entrance cables for existing residential occupancies of not more than three dwelling units (4) Busways (5) Cablebus (6) Mineral-insulated, metal-sheathed cable." 3. Delete section 230.44. 4. Revise section 230.46 to read: "Spliced Conductors. Service entrance conductors shall only be spliced in accordance with 230.46 (1) through (6): (1) Clamped or bolted connections in metering equipment enclosures (2) Where service entrance conductors are tapped from a utility controlled and locked (to prevent unauthorized access) bussed tap box, to supply two to six disconnecting means grouped at a common location (3) In an approved utility owned service splice box, where utility sized conductors are connected to conductors that supply customers service equipment and are sized to this chapter (4) A connection shall be permitted where service conductors are extended from a service drop to an outside meter location and returned to connect to the service entrance conductors of an existing installation (5) Where the service entrance conductors consist of busway, connections shall be permitted as required to assemble the various sections and fittings (6) For existing service-entrance conductors, it shall be permissible to install listed underground splice kits for: (a) Repair of existing conductors (b) Extension of conductors by special permission." 5. Revise subsection 230.50(B) to read: "Above Ground Service Conductors and Cables. Service-entrance conductors installed above ground shall be protected against physical damage as specified in 230.50(B)(1) or (B)(2), and shall comply with (B)(3) where applicable. (1) Service-Entrance Cables. Service-entrance cables, where subject to physical damage, shall be protected by any of the following: (a) Rigid metal conduit (b) Intermediate metal conduit (c) Other approved means (2) Other Than Service-Entrance Cable. Individual open conductors and cables other than service- entrance cables shall not be installed within 3.0 m (10 ft) of grade level or where exposed to physical damage. Exception: Type MI cable shall be permitted within 3.0 m (10 ft) of grade level where not exposed to physical damage or where protected in accordance with 300.5(D). (3) On Alley Side of Building. Service raceways or service-entrance cable on the alley side of buildings where subject to mechanical injury by vehicles shall be embedded flush in the masonry or concrete wall, or shall be suitably protected up to a height of 3.7 m (12 ft) above grade." 6. Revise section 230.51 to read: "Mounting Supports. Service-entrance cable conductors shall be supported by straps or other approved means within 300 mm (12 in.) of ever service head, gooseneck, or connection to a raceway or enclosure and at intervals not exceeding 750 mm (30 in.)." 7. Delete table 230.51(C). 8. Revise subsection 230.70(A) to read: "(A) Location. The service disconnecting means shall be installed in accordance with 230.70(A)(1), (A)(2), (A)(3), (A)(4), and (A)(5). (1) One-Family Dwellings. In one-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-Family Dwellings. In other than one-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 comply with 110.31. The electrical service rooms for tenant loads shall comply with 110.26. These rooms shall be for the exclusive use of electrical equipment. Separate service disconnecting means shall be required for each tenant floor. These disconnects shall be permitted to be located on a floor other than the floor served. 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)." 9. Insert the following language immediately before the exception in section 230.95: "Where busway is served by a feeder or sequence service disconnect rated 1,000 amperes or more, ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of any voltage." 10. Delete informational notes 1 through 4 to section 230.95. (Amend Coun. J. 1-23-19, p. 94952, Art. I, § 17)

Municipal Code of Chicago § 14E-2-240 Overcurrent protection.

14E-2-240 Overcurrent protection. The provisions of Article 240 of NFPA 70 are adopted by reference with the following modifications: 1. Revise section 240.2 by deleting the definition of "Supervised Industrial Installation." 2. Revise subsection 240.24(B) to read: "Occupancy. Each occupant shall have ready access to all overcurrent devices protecting the conductors supplying that occupancy, unless otherwise permitted in 240.24(B)(1) and (B)(2). In a building with multiple occupancies, overcurrent devices may be located at a central location within the building, provided that each occupancy has access to the overcurrent devices for that occupancy, and the overcurrent device for each occupancy is clearly marked with a permanent label identifying the occupancy served." 3. Insert new subsection 240.24(G) to read: "Not Located Outdoors. Branch circuit overcurrent devices, other than supplementary overcurrent protective devices, shall not be located outdoors or where exposed to the weather unless granted special permission." 4. Insert the following language at the end of section 240.85 and before the informational note: "Circuit breakers and their enclosures shall be of such design that it will be impossible to substitute two or more circuit breakers in a space previously occupied by a lesser number of circuit breakers. Tandem circuit breakers shall not be permitted to be used as overcurrent devices." 5. Revise Part VIII to read: "Part VIII. Reserved." (Amend Coun. J. 11-8-17, p. 59720, § 13)

Municipal Code of Chicago § 14E-2-250 Grounding and bonding.

14E-2-250 Grounding and bonding. The provisions of Article 250 of NFPA 70 are adopted by reference with the following modifications: 1. Revise section 250.58 to read: "Common Grounding Electrode System for High-Rise Buildings and Similar Buildings or Structures of Large Area. In high rise buildings and in similar buildings or structures that cover a large area, a common grounding electrode conductor, which will be considered an extension of the building grounding electrode, shall be permitted to be used as the required grounding electrode for all separately derived systems and communications systems. The common grounding electrode conductor shall originate at an approved connection on the street side of the incoming metallic water pipe. Informational Note: See Figure 250.58 – Common Grounding Electrode System which is also known as Hogan Ground. The common grounding electrode system installation shall comply with 250.58(A) through (C). (A) Size. The common grounding electrode system conductor shall be sized in accordance with Table 250.66 based on the largest service or separately derived system using the common grounding electrode conductor. The minimum size of the common grounding electrode system conductor shall be 4/0 AWG copper installed in a 1-1/4" metal raceway permitted by 250.64(B). The maximum size of the common grounding electrode system conductor shall be 500 kcmil AWG copper installed in a 1-1/2" metal raceway permitted by 250.64(B). (B) Splices and Taps. The common grounding electrode conductor shall be continuous through its entire length. Where a splice is necessary, it shall be made by the use of listed irreversible compression connectors or exothermic welding. The tap connections shall be made to aluminum or copper busbars not smaller than 1/4 in. × 2 in. If aluminum busbars are used, the installation shall comply with 250.64(A). (C) Approved Metal Junction Boxes. All splices and taps of the common grounding electrode system conductor shall be made in and bonded to an approved metal junction box. The metal junction box shall be mounted on or bonded to the nearest available structural member of the building." 2. Insert new figure 250.58 High Rise Common Ground Electrode System: [image omitted; see the official code] 3. Revise subsection 250.64(B) to read: "Securing and Protection Against Physical Damage. Where exposed, a grounding electrode conductor or its enclosure shall be securely fastened to the surface on which it is carried. All grounding electrode conductors shall be installed in rigid metal conduit (RMC), intermediate metal conduit (IMC), or electrical metallic tubing (EMT) in accordance with Table 250.66. Raceways for grounding electrode conductors shall not contain other conductors. Grounding electrode conductors and grounding electrode bonding jumpers in contact with the earth shall not be required to comply with 300.5, but shall be buried or otherwise protected if subject to physical damage." 4. Revise subsection 250.64(C) to read: "Continuous. Except as provided in 250.30(A)(5) and (A)(6), 250.30(B)(1), and 250.68(C), grounding electrode conductor(s) shall be installed in one continuous length without a splice or joint. If necessary, splices or connections shall be made as permitted in (1) through (2): (1) Splicing of the wire-type grounding electrode conductor shall be permitted only by irreversible compression-type connectors listed as grounding and bonding equipment or by the exothermic welding process. (2) Sections of busbars shall be permitted to be connected together to form a grounding electrode conductor." 5. Revise the second paragraph of subsection 250.64(D)(1): "A grounding electrode conductor tap shall extend to the inside of each service disconnecting means enclosure. The grounding electrode conductor taps shall be sized in accordance with 250.66 for the largest service-entrance conductor serving the individual enclosure. The tap conductors shall be connected to the common grounding electrode conductor by one of the following methods in such a manner that the common grounding electrode conductor remains without a splice or joint: (1) Exothermic welding. (2) Connectors listed as grounding and bonding equipment. (3) Connections to an aluminum or copper busbar not less than 1/4 in. × 2 in. The busbar shall be securely fastened in a metal box and shall be installed in an accessible location. Connections shall be made by a listed connector or by the exothermic welding process. If aluminum busbars are used, the installation shall comply with 250.64(A)." 6. Revise subsection 250.64(F)(3) to read: "Bonding jumper(s) from grounding electrode(s) shall be permitted to be connected to an aluminum or copper busbar not less than 1/4 in. thick × 2 in. wide and of sufficient length to accommodate the number of terminations necessary for the installation. The busbar shall be securely fastened and shall be installed in a metal box and at an accessible location. Connections shall be made by a listed connector or by the exothermic welding process. The grounding electrode conductor shall be permitted to be run to the busbar. Where aluminum busbars are used, the installation shall comply with 250.64(A)." 7. Revise table 250.66 to read: Size of Largest Service-Entrance Conductor or Equivalent for Parallel Conductor(s) | Size of Grounding Electrode Conductor and Conduit or Tubing Copper | Aluminum | Copper | Conduit or Tubing | Aluminum | Conduit or Tubing Size of Largest Service-Entrance Conductor or Equivalent for Parallel Conductor(s) | Size of Grounding Electrode Conductor and Conduit or Tubing Copper | Aluminum | Copper | Conduit or Tubing | Aluminum | Conduit or Tubing Up to 2 | Up to 1/0 | 8 | 1/2 in. | 6 | 1/2 in. Up to 1/0 | Up to 3/0 | 6 | 1/2 in. | 4 | 3/4 in. Up to 3/0 | Up to 250 | 4 | 3/4 in. | 2 | 3/4 in. Up to 350 | Up to 500 | 2 | 3/4 in. | 1/0 | 1 in. Up to 600 | Up to 900 | 1/0 | 1 in. | 3/0 | 1 in. Up to 1,100 | Up to 1,750 | 2/0 | 1 in. | 4/0 | 1 in. Up to 1,300 | Up to 2,000 | 3/0 | 1 in. | 250 | 1-1/4 in. Up to 1,700 | Up to 2,400 | 4/0 | 1 in. | 300 | 1-1/4 in. Up to 1,700 | Up to 2,800 | 250 | 1-1/4 in. | 350 | 1-1/4 in. Up to 2,000 | Up to 3,200 | 300 | 1-1/4 in. | 400 | 1-1/2 in. Up to 2,400 | Up to 4,000 | 350 | 1-1/4 in. | 500 | 1-1/2 in. Up to 2,800 | Up to 4,800 | 400 | 1-1/2 in. | 600 | 2 in. Up to 3,200 | Up to 5,600 | 500 | 1-1/2 in. | 700 | 2 in. (Amend Coun. J. 11-8-17, p. 59720, § 14)

Municipal Code of Chicago § 14E-2-280 Surge arresters, over 1,000 volts.

14E-2-280 Surge arresters, over 1,000 volts. The provisions of Article 280 of NFPA 70 are adopted by reference without modification.

Municipal Code of Chicago § 14E-2-285 Surge protective devices (SPDs), 1,000 volts or less.

14E-2-285 Surge protective devices (SPDs), 1,000 volts or less. The provisions of Article 285 of NFPA 70 are adopted by reference without modification.

Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2669545Fetched: 10/24/2026