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Article 626

Electrified Truck Parking Spaces

Part I. General

  1. Scope. The provisions of this article cover the electrical conductors and equipment external to the truck or transport refrigerated unit that connect trucks or transport refrigerated units to a supply of electricity, and the installation of equip‐ ment and devices related to electrical installations within an electrified truck parking space.
  2. Definitions.Cable Management System (Electrified Truck Parking Spaces). An apparatus designed to control and organize unused lengths of cable or cord at electrified truck parking spaces.Cord Connector. A device that, by inserting it into a truck flanged surface inlet, establishes an electrical connection to the truck for the purpose of providing power for the on-board elec‐ tric loads and may provide a means for information exchange. This device is part of the truck coupler.Disconnecting Means, Parking Space. The necessary equip‐ ment usually consisting of a circuit breaker or switch and fuses, and their accessories, located near the point of entrance of supply conductors in an electrified truck parking space and intended to constitute the means of cutoff for the supply to that truck.Electrified Truck Parking Space. A truck parking space that has been provided with an electrical system that allows truck operators to connect their vehicles while stopped and to use off-board power sources in order to operate on-board systems such as air conditioning, heating, and appliances, without any engine idling.Informational Note: An electrified truck parking space also includes dedicated parking areas for heavy-duty trucks at travel plazas, warehouses, shipper and consignee yards, depot facilities, and border crossings. It does not include areas such as the shoulders of highway ramps and access roads, camping and recreational vehicle sites, residential and commercial parking areas used for automotive parking or other areas where ac power is provided solely for the purpose of connecting automo‐ tive and other light electrical loads, such as engine block heat‐ ers, and at private residences.Electrified Truck Parking Space Wiring Systems. All of the electrical wiring, equipment, and appurtenances related to electrical installations within an electrified truck parking space, including the electrified parking space supply equipment.Overhead Gantry. A structure consisting of horizontal frame‐ work, supported by vertical columns spanning above electrified truck parking spaces, that supports equipment, appliances, raceway, and other necessary components for the purpose of supplying electrical, HVAC, internet, communications, and other services to the spaces.Separable Power Supply Cable Assembly. A flexible cord or cable, including ungrounded, grounded, and equipment grounding conductors, provided with a cord connector, an attachment plug, and all other fittings, grommets, or devices installed for the purpose of delivering energy from the source of electrical supply to the truck or TRU flanged surface inlet.Transport Refrigerated Unit (TRU). A trailer or container, with integrated cooling or heating, or both, used for the purpose of maintaining the desired environment of temperature-sensitive goods or products.Truck. A motor vehicle designed for the transportation of goods, services, and equipment.Truck Coupler. A truck flanged surface inlet and mating cord connector.Truck Flanged Surface Inlet. The device(s) on the truck into which the connector(s) is inserted to provide electric energy and other services. This device is part of the truck coupler. For the purposes of this article, the truck flanged surface inlet is considered to be part of the truck and not part of the electri‐ fied truck parking space supply equipment.
  3. Other Articles. Wherever the requirements of other articles of this Code and Article 626 differ, the requirements of Article 626 shall apply. Unless electrified truck parking space wiring systems are supported or arranged in such a manner that they cannot be used in or above locations classified in

511.3 or 514.3, or both, they shall comply with 626.3(A) and (B) in addition to the requirements of this article.

  1. Vehicle Repair and Storage Facilities. Electrified truck parking space electrical wiring systems located at facilities for the repair or storage of self-propelled vehicles that use volatile flammable liquids or flammable gases for fuel or power shall comply with Article 511.
  2. Motor Fuel Dispensing Stations. Electrified truck parking space electrical wiring systems located at or serving motor fuel dispensing stations shall comply with Article 514.

Informational Note: For additional information, see NFPA 88A -2015, Standard for Parking Structures, and NFPA 30A -2015, Code for Motor Fuel Dispensing Facilities and Repair Garages.

626.4 General Requirements.

  1. Not Covered. The provisions of this article shall not apply to that portion of other equipment in residential, commercial, or industrial facilities that requires electric power used to load and unload cargo, operate conveyors, and for other equipment used on the site or truck.
  2. Distribution System Voltages. Unless other voltages are specified, the nominal ac system voltages of 120, 120/240,
    208Y/120, 240, or 480Y/277 shall be used to supply equipment covered by this article.
  3. Connection to Wiring System. The provisions of this arti‐ cle shall apply to the electrified truck parking space supply equipment intended for connection to a wiring system as defined in 626.4(B).

Part II. Electrified Truck Parking Space Electrical Wiring Systems

  1. Branch Circuits. Electrified truck parking space single- phase branch circuits shall be derived from a 208Y/120-volt, 3-phase, 4-wire system or a 120/240-volt, single-phase, 3-wire system.Exception: A 120-volt distribution system shall be permitted to supply existing electrified truck parking spaces.
  2. Feeder and Service Load Calculations.
  1. Parking Space Load. The calculated load of a feeder or service shall be not less than the sum of the loads on the branch circuits. Electrical service and feeders shall be calcula‐ ted on the basis of not less than 11 kVA per electrified truck parking space.
  2. Demand Factors. Electrified truck parking space electri‐ cal wiring system demand factors shall be based upon the climatic temperature zone in which the equipment is installed. The demand factors set forth in Table 626.11(B) shall be the minimum allowable demand factors that shall be permitted for calculating load for service and feeders. No demand factor shall be allowed for any other load, except as provided in this article.Informational Note: The U.S. Department of Agriculture (USDA) has developed a commonly used “Plant Hardiness Zone” map that is publicly available. The map provides guidance for determining the Climatic Temperature Zone. Data indicate that the HVAC has the highest power requirement in cold climates, with the heating demand representing the greatest load, which in turn is dependent on outside temperature. In very warm climates, where no heating load is necessary, the cool‐ ing load increases as the outdoor temperature rises.
  3. Two or More Electrified Truck Parking Spaces. Where the electrified truck parking space wiring system is in a location that serves two or more electrified truck parking spaces, the equipment for each space shall comply with 626.11(A), and the calculated load shall be calculated on the basis of each parking space.
  4. Conductor Rating. Truck space branch-circuit supplied loads shall be considered to be continuous.

Part III. Electrified Truck Parking Space Supply Equipment

  1. Wiring Methods and Materials.
    1. Electrified Truck Parking Space Supply Equipment Type. The electrified truck parking space supply equipment shall be provided in one of the following forms:
      1. Pedestal
      2. Overhead gantry
      3. Raised concrete pad
      Table 626.11(B) Demand Factors for Services and Feeders
      Climatic Temperature Zone (USDA Hardiness Zone)
      Demand FactorSee Note(%)170%2a67%2b62%3a59%3b57%4a55%4b51%5a47%5b43%6a39%6b34%7a29%7b24%8a21%8b20%9a20%9b20%10a21%10b23%1124%Note: The climatic temperature zones shown in Table 626.11(B) correlate with those found on the “USDA Plant Hardiness Zone Map,” and the climatic temperature zone selected for use with the table shall be determined through the use of this map based on the installation location.
    2. Mounting Height. Post, pedestal, and raised concrete pad types of electrified truck parking space supply equipment shall be not less than 600 mm (2 ft) aboveground or above the point identified as the prevailing highest water level mark or an equivalent benchmark based on seasonal or storm-driven flood‐ ing from the authority having jurisdiction.
    3. Access to Working Space. All electrified truck parking space supply equipment shall be accessible by an unobstructed entrance or passageway not less than 600 mm (2 ft) wide and not less than 2.0 m (6 ft 6 in.) high.
    4. Disconnecting Means. A disconnecting switch or circuit breaker shall be provided to disconnect one or more electrified truck parking space supply equipment sites from a remote loca‐ tion. The disconnecting means shall be provided and installed in a readily accessible location and shall be lockable open in accordance with 110.25.
  2. Overhead Gantry or Cable Management System.
    1. Cable Management. Electrified truck parking space equipment provided from either overhead gantry or cable management systems shall utilize a permanently attached power supply cable in electrified truck parking space supply equipment. Other cable types and assemblies listed as being suitable for the purpose, including optional hybrid communi‐ cations, signal, and composite optical fiber cables, shall be permitted.
    2. Strain Relief. Means to prevent strain from being trans‐ mitted to the wiring terminals shall be provided. Permanently attached power supply cable(s) shall be provided with a means

    to de-energize the cable conductors and power service delivery device upon exposure to strain that could result in either cable damage or separation from the power service delivery device and exposure of live parts.
  3. Electrified Truck Parking Space Supply Equipment Connection Means.
  1. General. Each truck shall be supplied from electrified truck parking space supply equipment through suitable extra- hard service cables or cords. Each connection to the equip‐ ment shall be by a single separable power supply cable assembly.
  2. Receptacle. All receptacles shall be listed and of the grounding type. Every truck parking space with electrical supply shall be equipped with (B)(1) and (B)(2).
    1. A maximum of three receptacles, each 2-pole, 3-wire grounding type and rated 20 amperes, 125 volts, and two of the three connected to two separate branch circuits.Informational Note: For the nonlocking-type and grounding- type 20-ampere receptacle configuration, see ANSI/NEMA WD6-2012, Wiring Devices — Dimensional Specifications, Figure 5-20.
    2. One single receptacle, 3-pole, 4-wire grounding type, single phase rated either 30 amperes 208Y/120 volts or 125/250 volts. The 125/250-volt receptacle shall be permitted to be used on a 208Y/120-volt, single-phase circuit.
    Informational Note: For various configurations of 30-ampere pin and sleeve receptacles, see ANSI/UL1686, Standard for Pin and Sleeve Configurations, Figure C2.9 or Part C3.Exception: Where electrified truck parking space supply equipment provides the heating, air-conditioning, and comfort-cooling function without requiring a direct electrical connection at the truck, only two receptacles identified in 626.24(B)(1) shall be required.
  3. Disconnecting Means, Parking Space. The electrified truck parking space supply equipment shall be provided with a switch or circuit breaker for disconnecting the power supply to the electrified truck parking space. A disconnecting means shall be provided and installed in a readily accessible location and shall be lockable open in accordance with 110.25.
  4. Ground-Fault Circuit-Interrupter Protection for Person‐ nel. The electrified truck parking space equipment shall be designed and constructed such that all receptacle outlets in
  1. are provided with ground-fault circuit-interrupter protection for personnel.
  2. Separable Power-Supply Cable Assembly. A separable power-supply cable assembly, consisting of a power-supply cord, a cord connector, and an attachment plug intended for connection with a truck flanged surface inlet, shall be of a listed type. The power-supply cable assembly or assemblies shall be identified and be one of the types and ratings specified in 626.25(A) and (B). Cords with adapters and pigtail ends, extension cords, and similar items shall not be used.
    1. Rating(s).
      1. Twenty-Ampere Power-Supply Cable Assembly. Equip‐ ment with a 20-ampere, 125-volt receptacle, in accordance with 626.24(B)(1), shall use a listed 20-ampere power-supply cable assembly.Exception: It shall be permitted to use a listed separable power-supply cable assembly, either hard service or extra-hard service and rated 15 amperes, 125 volts, for connection to an engine block heater for legacy vehicles.
      2. Thirty-Ampere Power-Supply Cable Assembly. Equipment with a 30-ampere, 208Y/120-volt or 125/250-volt receptacle, in accordance with 626.24(B)(2), shall use a listed 30-ampere main power-supply cable assembly.
    2. Power-Supply Cord.
      1. Conductors. The cord shall be a listed type with three or four conductors, for single-phase connection, one conductor of which shall be identified in accordance with 400.23.Exception: It shall be permitted to use a separate listed three-conductor separable power-supply cable assembly, one conductor of which shall be identified in accordance with 400.23 and rated 15 amperes, 125 volts for connection to an engine block heater for existing vehicles.
      2. Cord. Extra-hard usage flexible cords and cables rated not less than 90°C (194°F), 600 volts; listed for both wet locations and sunlight resistance; and having an outer jacket rated to be resistant to temperature extremes, oil, gasoline, ozone, abra‐ sion, acids, and chemicals shall be permitted where flexibility is necessary between the electrified truck parking space supply equipment, the panel board, and flanged surface inlet(s) on the truck.Exception: Cords for the separable power supply cable assembly for 15- and 20-ampere connections shall be permitted to be a hard service type.
      3. Cord Overall Length. The exposed cord length shall be measured from the face of the attachment plug to the point of entrance to the truck or the face of the flanged surface inlet or to the point where the cord enters the truck. The overall length of the cable shall not exceed 7.5 m (25 ft) unless equip‐ ped with a cable management system that is listed as suitable for the purpose.
      4. Attachment Plug. The attachment plug(s) shall be listed, by itself or as part of a cord set, for the purpose and shall be molded to or installed on the flexible cord so that it is secured tightly to the cord at the point where the cord enters the attachment plug. If a right-angle cap is used, the configuration shall be oriented so that the grounding member is farthest from the cord. Where a flexible cord is provided, the attach‐ ment plug shall comply with 250.138(A).
        1. Connection to a 20-Ampere Receptacle. A separable power-supply cable assembly for connection to a truck flanged surface inlet, rated at 20 amperes, shall have a nonlocking-type attachment plug that shall be 2-pole, 3-wire grounding type rated 20 amperes, 125 volts and intended for use with the 20-ampere, 125-volt receptacle.Exception: A separable power-supply cable assembly, rated 15 amperes, provided for the connection of an engine block heater, only, shall have an attachment plug that shall be 2-pole, 3-wire grounding type rated 15 amperes, 125 volts.Informational Note: For nonlocking- and grounding-type 15- or 20-ampere plug and receptacle configurations, see ANSI/NEMA WD6-2002, Standard for Dimensions of Attachment Plugs and Recepta‐ cles, Figure 5-15 or Figure 5-20.
        2. Connection to a 30-Ampere Receptacle. A separable power-supply cable assembly for connection to a truck flanged surface inlet, rated at 30 amperes, shall have an attachment
          plug that shall be 3-pole, 4-wire grounding type rated 30-amperes, 208Y/120 volts or 125/250 volts, and intended for use with the receptacle in accordance with 626.24(B)(2). The 125/250-volt attachment plug shall be permitted to be used on a 208Y/120-volt, single-phase circuit.Informational Note: For various configurations of 30-ampere pin and sleeve plugs, see ANSI/UL 1686-2012, Standard for Pin and Sleeve Configurations, Figure C2.10 or Part C3.
      5. Cord Connector. The cord connector for a separable power-supply cable assembly, as specified in 626.25(A)(1), shall be a 2-pole, 3-wire grounding type rated 20 amperes, 125 volts. The cord connector for a separable power-supply cable assem‐ bly, as specified in 626.25(A)(2), shall be a 3-pole, 4-wire grounding type rated 30 amperes, 208Y/120 volts or 125/250 volts. The 125/250-volt cord connector shall be permitted to be used on a 208Y/120-volt, single-phase circuit.
    Exception: The cord connector for a separable power supply cable assem‐ bly, rated 15 amperes, provided for the connection of an engine block heater for existing vehicles, shall have an attachment plug that shall be 2-pole, 3-wire grounding type rated 15 amperes, 125 volts.Informational Note: For various configurations of 30-ampere cord connectors, see ANSI/UL 1686-2012, Standard for Pin and Sleeve Configurations, Figure C2.9 or Part C3.
  3. Loss of Primary Power. Means shall be provided such that, upon loss of voltage from the utility or other electric supply system(s), energy cannot be back-fed through the truck and the truck supply equipment to the electrified truck parking space wiring system unless permitted by 626.27.
  4. Interactive Systems. Electrified truck parking space supply equipment and other parts of a system, either on-board or off-board the vehicle, that are identified for and intended to be interconnected to a vehicle and also serve as an optional standby system or an electric power production source or provide for bi-directional power feed shall be listed as suitable for that purpose. When used as an optional standby system, the requirements of Article 702 shall apply, and when used as an electric power production source, the requirements of Arti‐ cle 705 shall apply.

Part IV. Transport Refrigerated Units (TRUs)

  1. Transport Refrigerated Units. Electrified truck park‐ ing spaces intended to supply transport refrigerated units (TRUs) shall include an individual branch circuit and recepta‐ cle for operation of the refrigeration/heating units. The recep‐ tacle associated with the TRUs shall be provided in addition to the receptacles required in 626.24(B).
    1. Branch Circuits. TRU spaces shall be supplied from 208-volt, 3-phase or 480-volt, 3-phase branch circuits and with an equipment grounding conductor.
    2. Electrified Truck Parking Space Supply Equipment. The electrified truck parking space supply equipment, or portion thereof, providing electric power for the operation of TRUs shall be independent of the loads in Part III of Article 626.
  2. Disconnecting Means and Receptacles.
    1. Disconnecting Means. Disconnecting means shall be provided to isolate each refrigerated unit from its supply connection. A disconnecting means shall be provided andinstalled in a readily accessible location and shall be lockable open in accordance with 110.25.
    2. Location. The disconnecting means shall be readily acces‐ sible, located not more than 750 mm (30 in.) from the recepta‐ cle it controls, and located in the supply circuit ahead of the receptacle. Circuit breakers or switches located in power outlets complying with this section shall be permitted as the disconnecting means.
    3. Receptacles. All receptacles shall be listed and of the grounding type. Every electrified truck parking space intended to provide an electrical supply for transport refrigerated units shall be equipped with one or more of the following:
    1. A 30-ampere, 480-volt, 3-phase, 3-pole, 4-wire receptacle
    2. A 60-ampere, 208-volt, 3-phase, 3-pole, 4-wire receptacle
    (3) A 20-ampere, 1000-volt, 3-phase, 3-pole, 4-wire receptacle,pin and sleeve typeInformational Note: Complete details of the 30-ampere pin and sleeve receptacle configuration for refrigerated containers (transport refrigerated units) can be found in ANSI/ UL 1686-2012, Standard for Pin and Sleeve Configurations, Figure C2.11. For various configurations of 60-ampere pin and sleeve receptacles, see ANSI/UL1686.
  3. Separable Power Supply Cable Assembly. A separable power supply cable assembly, consisting of a cord with an attachment plug and cord connector, shall be one of the types and ratings specified in 626.32(A), (B), and (C). Cords with adapters and pigtail ends, extension cords, and similar items shall not be used.
  1. Rating(s). The power supply cable assembly shall be listed and be rated in accordance with one of the following:
    1. 30 ampere, 480-volt, 3-phase
    2. 60 ampere, 208-volt, 3-phase (3) A 20-ampere, 1000-volt, 3-phase
  2. Cord Assemblies. The cord shall be a listed type with four conductors, for 3-phase connection, one of which shall be iden‐ tified in accordance with 400.23 for use as the equipment grounding conductor. Extra-hard usage cables rated not less than 90°C (194°F), 600 volts, listed for both wet locations and sunlight resistance, and having an outer jacket rated to be resistant to temperature extremes, oil, gasoline, ozone, abra‐ sion, acids, and chemicals, shall be permitted where flexibility is necessary between the electrified truck parking space supply equipment and the inlet(s) on the TRU.
  3. Attachment Plug(s) and Cord Connector(s). Where a flex‐ ible cord is provided with an attachment plug and cord connec‐ tor, they shall comply with 250.138(A). The attachment plug(s) and cord connector(s) shall be listed, by itself or as part of the power-supply cable assembly, for the purpose and shall be molded to or installed on the flexible cord so that it is secured tightly to the cord at the point where the cord enters the attachment plug or cord connector. If a right-angle cap is used, the configuration shall be oriented so that the grounding member is farthest from the cord. An attachment plug and cord connector for the connection of a truck or trailer shall be rated in accordance with one of the following:
  1. 30-ampere, 480-volt, 3-phase, 3-pole, 4-wire and intended for use with a 30-ampere 480-volt, 3-phase, 3-pole, 4-wire receptacles and inlets, respectivelyARTICLE 630 — ELECTRIC WELDERS 630.14
  2. 60-ampere, 208-volt, 3-phase, 3-pole, 4-wire and intended for use with a 60-ampere, 208-volt, 3-phase, 3-pole, 4-wire receptacles and inlets, respectively, or

(3) 20-ampere, 1000-volt, 3-phase, 3-pole, 4-wire and inten‐

ded for use with a 20-ampere, 1000-volt, 3-phase, 3-pole, 4-wire receptacles and inlets, respectively.

Informational Note: Complete details of the 30-ampere pin and sleeve attachment plug and cord connector configurations for refrigerated containers (transport refrigerated units) can be found in ANSI/UL 1686-2012, Standard for Pin and Sleeve Configu‐ rations, Figures C2.12 and C2.11. For various configurations of 60-ampere pin and sleeve attachment plugs and cord connec‐ tors, see ANSI/UL1686.

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