When so used, the rating or setting of the overcurrent device

protecting the busway shall determine the ampere rating of the branch circuit, and the circuit shall in all respects conform with the requirements of Article 210 that apply to branch circuits of that rating. 364-14. Length of Busways Used as Branch Circuits. Busways used as branch circuits and designed so that loads can be connected at any point shall be limited to such lengths as will provide that in normal use the circuits will not be overloaded. 364-15. Marking. Busways shall be marked with the voltage and current rating for which they are designed, and with the manufacturer's name or trademark in such manner as to be visible after installation. B. Requirements for Over 600 Volts, Nominal 364-21. Identification. Each bus run shall be provided with a permanent nameplate on which the following information shall be provided: (1) rated voltage; (2) rated continuous current; if bus is forced-cooled, both the normal forced-cooled rating and the self-cooled (not forced-cooled) rating for 70-276 NATIONAL ELECTRICAL CODE the same temperature rise shall be given; (3) rated frequency; (4) rated impulse withstand voltage; (5) rated 60-Hz withstand voltage (dry); (6) rated momentary current; and (7) manufacturer's name or trademark. (FPN): See Switchgear Assemblies, ANSI C37.20-1969 (R1982), for construction and testing requirements for metal-enclosed buses. 364-22. Grounding. Metal-enclosed bus shall be grounded in accordance with Article 250. 364-23. Adjacent and Supporting Structures. Metal-enclosed busways shall be installed so that temperature rise from induced circulating currents in any adjacent metallic parts will not be hazardous to personnel or constitute a fire hazard. 364-24. Neutral. Neutral bus, where required, shall be sized to carry all neutral load current, including harmonic currents, and shall have adequate momentary and short-circuit rating consistent with system requirements. 364-25. Barriers and Seals. Bus runs having sections located both inside and outside of buildings shall have a vapor seal at the building wall to prevent interchange of air between indoor and outdoor sections. Exception: Vapor seals shall not be required in forced-cooled bus. Fire barriers shall be provided where fire walls, floors, or ceilings are penetrated. (FPN): See Section 300-21 for information concerning the spread of fire or products of combustion. 364-26. Drain Facilities. Drain plugs, filter drains, or similar methods shall be provided to remove condensed moisture from low points in bus run. 364-27. Ventilated Bus Enclosures. Ventilated bus enclosures shall be installed in accordance with Article 710, Part D, unless designed so that foreign objects inserted through any opening will be deflected from energized parts. 364-28. Terminations and Connections. Where bus enclosures terminate at machines cooled by flammable gas, seal-off bushings, baffles, or other means shall be provided to prevent accumulation of flammable gas in the bus enclosures. Flexible or expansion connections shall be provided in long, straight runs of bus to allow for temperature expansion or contraction, or where the bus run crosses building vibration insulation joints. All conductor termination and connection hardware shall be accessible for installation, connection, and maintenance. 364-29. Switches. Switching devices or disconnecting links provided in the bus run shall have the same momentary rating as the bus. Disconnecting links shall be plainly marked to be removable only when bus is deenergized. Switching devices that are not load break shall be interlocked to prevent operation under load, and disconnecting link enclosures shall be interlocked to prevent access to energized parts.