Columbia Amendments to 2017 Edition of National Electric Code NFPA 70 ordinance (§ 6-33)

The 2017 Edition of the National Electric Code NFPA 70 adopted by this article is hereby amended by substituting the following sections in lieu of those sections with corresponding numbers in the code, or, where there is no corresponding section in the code, the following sections shall be enacted as additions to the code:

90.2.1 Title. This section shall be known as the Electrical Code of the City of Columbia, Missouri and will be referred to as "this code."

210.8 Ground-Fault Circuit-Interrupter Protection for Personnel. (A) Dwelling Units, shall be amended as follows:

"(2) Garages, and accessory buildings that have a floor located at or below grade level not intended as habitable rooms and limited to storage areas, work areas, and areas of similar use" shall have the following exceptions added:

Exception 1 to (2): Receptacles in locations that are not readily accessible (e.g., on the ceiling of a garage).

Exception 2 to (2): A single receptacle or a duplex receptacle for two appliances located within dedicated space for each appliance that, in normal use, is not easily moved from one place to another and that is cord-and-plug connected in accordance with 400.7(A)(6), (A7), or (A8).

"(3) Outdoors" shall have the following exception added:

Exception 2 to (3): GFCI receptacles located in exterior soffits and used for seasonal decorative lighting are not required to be readily accessible.

"(5) Unfinished portions or areas of the basement not intended as habitable rooms" shall have the following exception added:

Exception 2 to (5): A single receptacle or a duplex receptacle for two appliances located within dedicated space for each appliance that, in normal use, is not easily moved from one place to another and that is cord-and-plug connected in accordance with 400.7(A)(6), (A7), or (A8).

"(7) Sinks - where receptacles are installed within 1.8 m (6 ft) from the top inside edge of the bowl of the sink" shall have the following exception added:

Exception 1 to (7): Where the receptacles are installed within 1.8 m (6 feet) of the outside edge of the sink:

(a) Receptacles installed for specific appliances such as clothes washers, refrigerators, garbage disposals, dishwashers, and microwave ovens shall not be required to be GFCI protected where located within 6 feet of laundry, utility, kitchen or wet bar sink in a dwelling.

(b) A duplex receptacle may be used for a single appliance provided the duplex receptacle is located behind the appliance which, in normal use, is not easily moved and the receptacle is not readily accessible for the use of power tools. This receptacle must be marked "not GFCI protected". Receptacles installed under the exceptions to 210.8(A)(7) shall not be considered as meeting the requirements of 210.52(G).

210.8 Ground-Fault Circuit-Interrupter Protection for Personnel. (D) Kitchen Dishwasher Branch circuit. Delete this section.

210.12 Arc-Fault Circuit-Interrupter Protection. (A) Dwelling Units. The first sentence shall be amended to read as follows: All 120-volt, single phase, 15- and 20-ampere branch circuits supplying outlets installed in dwelling unit bedrooms and for smoke detectors shall be protected by a listed arc-fault circuit interrupter, combination-type, installed to provide protection of the branch circuit.

210.12 Arc-Fault Circuit-Interrupter Protection. (A) Dwelling Units. A second exception shall be added to the end of the section as follows:

Exception: Arc-Fault circuit interrupter protection is not required in one- and two-family dwellings which are regulated by the International Residential Code.

210.12(B) Dormitory Units. The following sentence shall be added to the end of the section: This requirement applies to sleeping units in fraternities and sororities.

210.52 Dwelling unit receptacle outlets (C) Countertops and Work Surface (5) Receptacle outlet location shall be amended as follows:

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. Placement of the receptacle is allowed no more than 12 inches below the countertop, and anywhere the countertop extends beyond its support base.

(1) Construction for the physically impaired

(2) On island and peninsular countertops or work surface where the surface 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 or work surface, such as an overhead cabinet 210.52 Dwelling Unit Receptacle Outlets. (E) Outdoor Outlets. (3) Balconies, Decks, and Porches. The following sentence shall be added at the end of the section: A receptacle is not required at an existing structure.

210.63 Heating, Air-Conditioning, and Refrigeration Equipment Outlet. The following exception shall be added at the end of the section:

Exception No. 2: A receptacle outlet shall not be required for rooftop and exterior equipment on oneand two-family dwellings.

210.64 Electrical service areas. In other than 1- and 2-family dwellings, at least one 125-volt, single phase, 15- or 20-ampere-rated receptacle outlet shall be installed in an accessible location within 7.5 m (25 feet) of the indoor electrical service equipment. The required receptacle outlet shall be located within the same room or area as the service equipment.

Part II. Branch Circuit Load Calculations. 220.14 Other Loads - All Occupancies. (J) Dwelling Occupancies. This section shall be amended to read as follows:

In multi-family dwellings and in guest rooms or guest suites of hotels and motels, the outlets specified in (J) (1), (J)(2), and (J)(3) are included in the general lighting load calculations of 220.12. No additional load calculations shall be required for such outlets.

(1) All general-use receptacle outlets of 20-ampere rating or less, including receptacles connected to the circuits in 210.11(C)(3)

(2) The receptacle outlets specified in 210.52(E) and (G)

(3) The lighting outlets specified in 210.70(A) and (B) In one-family and two-family dwellings the requirements specified in (J)(4), (J)(5), (J)(6) shall be met.

(4) In one-family and two-family dwellings, a 15-amp rated general purpose circuit shall be limited to a maximum of eight receptacle outlets or openings, or eight lighting outlets or openings, or any combination of receptacle outlets and lighting outlets totaling not more than eight. (5)

In one-family and two-family dwellings, a 20-amp rated general purpose circuit shall be limited to a maximum of ten receptacle outlets or openings, or ten lighting outlets or openings, or any combination of receptacle outlets and lighting outlets totaling not more than ten.

(6) In one-family and two-family dwellings, the small appliance circuits serving the kitchen countertop and similar areas, shall be limited to not more than two receptacle outlets or openings for the first two such circuits; the third and succeeding small appliance circuits shall be limited to not more than three receptacle outlets or openings per circuit.

(7) In one-family and two-family dwellings, the microwave receptacle outlet shall be a dedicated 20-amp rated circuit, and shall share with no other outlets.

230.50 Protection Against Physical Damage. (B) All Other Service-Entrance Conductors. (1) Service Entrance Cables. (3) "Schedule 80 PVC conduit" shall be deleted and "40 rigid nonmetallic conduit or equivalent" shall be inserted.

250.52 Grounding Electrodes. (A) Electrodes Permitted for Grounding. (3) Concrete-Encased Electrode. The following exception shall be added at the end of the section:

Exception 1 to (3): Buildings governed by the International Residential Code are exempt from the requirement that a concrete-encased electrode serve as part of the grounding electrode system.

250.53. Grounding Electrode System Installation. (A) Rod, Pipe, and Plate Electrodes. (2) Supplemental Electrode Required. Delete in its entirety.

300.5 Underground Installations. (D) Protection from Damage. (3) Service Conductors. Warning tape shall be installed a minimum of six (6) inches below grade and not less than twelve (12) inches above the electrical cables or conduit in all underground installations of 50 volts or more.

300.5 Underground Installations. (D) Protection from Damage. (4) Enclosure and raceway Damage. Where the enclosure or raceway is subject to physical damage, the conductors shall be installed in rigid metal conduit, intermediate metal conduit, RTRC-XW, Schedule 80 PVC conduit, or equivalent.

300.11 Securing and Supporting. (B) Wiring Systems Installed Above Suspended Ceilings. (2) Non-Fire Rated Assemblies. The following exception shall be added at the end of the section:

Exception: One ¾ inch raceway or smaller, with maximum conductor fill (for example, twelve #12 AWG), shall be permitted to be supported by the ceiling support wires.

314.23 Supports. (B) Structural Mounting. (1) Nails and Screws: The following sentence shall be added to the end of the section: Screws may be installed through the interior sides of a nonmetallic box to mount or fasten the box in place regardless of its listing and labeling provided the heads of the screws are covered or coated with a nonmetallic material.

334.12 Uses not permitted. (A) Types NM, NMC, and NMS. Item (2) in this subsection which reads "Exposed in dropped or suspended ceilings in other than one- and two-family and multi-family dwellings." shall be deleted in its entirety.

334.12 Uses not permitted. (B) Types NM and NMS. The following exception shall be added at the end of the section:

Exception 1 to (B): Type NMS cable shall be permitted in wet or damp locations.

334.15 Exposed Work. (B) Protection from Physical Damage: Cable shall be protected from physical damage where necessary by rigid metal conduit, intermediate metal conduit, electrical metallic tubing. Schedule 40 PVC conduit, or other approved means. Where passing through a floor, the cable shall be enclosed in rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 40 PVC conduit, or other approved means extending at least 150 mm (6 inches) above the floor.

334.80 Ampacity. The ampacity of Types NM, NMC and NMS cable shall be determined in accordance with 310.15. The ampacity shall be in accordance with the 60 degrees Celsius (140 degrees Fahrenheit) conductor temperature rating. The 90 degree Celsius (194 degree Fahrenheit) rating shall be permitted to be used for ampacity derating purposes, provided the final derated ampacity does not exceed that for a 60 degrees Celsius (140 degrees Fahrenheit) rated conductor. The ampacity of Types NM, NMC, and NMS cable installed in cable shall be determined in accordance with 392.11.

Where more than two NM cables containing two or more current-carrying conductors are installed, without maintaining spacing between the cables, through the same opening in wood framing that is to be fire- or draft-stopped using thermal insulation, caulk, or sealing foam, the allowable ampacity of each conductor shall be adjusted in accordance with Table 310.15(B)(2)(a).

338.10 Uses Permitted. (B) Branch Circuits or Feeders. (4) Installation Methods for Branch Circuits and Feeders. (a) Interior Installations. In addition the provisions of this article, Type SE service-entrance cable used for interior wiring shall comply with the installation requirements of Part II of Article 334, excluding 334.80.

404.2. Switch Connections. (C) Switches Controlling Lighting Loads: Delete in its entirety.

404.9 Provisions for General-Use Snap Switches. (B) Grounding: The following exception shall be added at the end of the section:

Exception No. 4 to (B): In one- and two-family dwellings, switches mounted to non-metallic boxes with non-metallic face plates shall not be required to be effectively grounded.

404.10 Mounting of Snap Switches. (B) Box Mounted. The following sentence shall be added to the end of the section: The requirement for machine-threaded screws shall not apply to plastic outlet boxes.

406.4 General Installation requirements. (D) Replacements. The following exception shall be added at the end of the section:

Exception No. 1: Soffit receptacles and/or lighting.

406.5 Receptacle Mounting. The following sentence shall be added to the end of the first paragraph: The requirement for machine-threaded screws shall not apply to plastic outlet boxes.

406.9 Receptacles in Damp or Wet Locations.

(A) Damp Locations. A receptacle installed outdoors in a location protected from the weather or in other damp locations shall have an enclosure for the receptacle that is weatherproof when the receptacle is covered (attachment plug cap not inserted and receptacle covers closed).

An installation suitable for wet locations shall also be considered suitable for damp locations.

A receptacle shall be considered to be in a location protected from weather where located under roofed open porches, canopies, marquees, and the like, and will not be subjected to a beating rain or water runoff.

(B) Wet Locations.

(1) Receptacles of 15- and 20-amperes in a wet location. Receptacles of 15- and 20- ampere, 125- and 250-volt receptacles installed in a wet location shall have an enclosure that is weather-proof whether or not the attachment plug cap is inserted. Weatherproof "in-use or bubble" covers not required.

406.12 Tamper-Resistant Receptacles. Item (1) "Dwelling units in all areas specified in 210.52 and 550.13" shall be deleted in its entirety.

406.12 Tamper-Resistant Receptacles. Item (5) shall be amended to read as follows: Waiting rooms and the like in clinics, medical and dental offices and outpatient facilities.

410.24 Connection of Electric-Discharge and LED Luminaires. (B) Access to Boxes. Delete in its entirety.

422.16 Flexible Cords. (B) Specific Appliances. (2) Built-in Dishwashers and Trash Compactors. Item (6) shall be amended to read as follows:

(6) The receptacle for a built-in dishwasher shall be permitted in the space adjacent to the space occupied by the dishwasher. The receptacle serving a built-in dishwasher shall be permitted in the space occupied by the dishwasher unless manufacturer instructions require the plug to be in an adjacent cabinet.

422.16 Flexible Cords. (B) Specific Appliances. A new subsection (5) shall be added as follows:

(5) Storage-Type Water heaters. Storage-type water heaters shall be permitted to be cord-and-plug connected with a flexible cord rated at 30 amperes. Cord will not be required to be listed for this use.

440.14 Location. The following exception shall be added at the end of the section:

Exception No. 3: Cord-and-plug connected appliances.

547.5 Wiring Methods. (F) Separate Equipment Grounding Conductor. The following sentence shall be added at the end of the section: Aluminum equipment grounding conductors shall not be permitted underground in agricultural buildings or areas.

590.4 General. (D) Receptacles. (2) Receptacles in Wet Locations. Delete in its entirety.

600.6 Disconnects. (A) Location. (1) At Point of Entry to a Sign: Disconnects for signs and for outline lighting shall be located at the point where the feeder or branch circuits(s) enters the sign enclosure or pole, and shall disconnect all ungrounded conductors where they enter the sign enclosure or pole. The disconnect shall open all ungrounded conductors where it enters the enclosure of the sign or pole.

680.43 Indoor Installations. Exception No. 2 shall be deleted in its entirety.

680.74 Bonding. Delete the last sentence of subsection (B).

700.10 Wiring, Emergency System. (A) Identification. A new Item (3) shall be added to this section to read as follows:

(3) Examples: Components may be permanently marked "red" or "emergency system."