125/250-volt attachment plug shall be permitted to be used on a
208Y/120-volt, single-phase circuit.
FPN: For various configurations of 30-ampere pin and sleeve plugs, see ANSI/UL1686, 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 assembly, 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 assembly, 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.

FPN: For various configurations of 30-ampere cord con- nectors, see ANSI/UL1686 Standard for Pin and Sleeve Configurations, Figure C2.9 or Part C3.

626.26 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.

626.27 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 Article 705 shall apply.

IV. Transport Refrigerated Units (TRUs)

626.30 Transport Refrigerated Units. Electrified truck parking spaces intended to supply transport refrigerated units (TRUs) shall include an individual branch circuit and receptacle for operation of the refrigeration/heating units. The receptacle associated with the TRUs shall be provided in addition to the receptacles required in 626.24(B).

(A) 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 in
accordance with 250.118.

(B) Electrified TVuck 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.

626.31 Disconnecting Means and Receptacles.

(A) Disconnecting Means. Disconnecting means shall be provided to isolate each refrigerated unit from its supply connection. A disconnecting means shall be provided and installed in a readily accessible location and shall be capable of being locked in the open position. Portable means for adding a lock to the switch or circuit breaker shall not be permitted as the means

required to be installed at and remain with the equipment.

(B) Location. The disconnecting means shall be readily accessible, located