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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)
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)
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:
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)