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The alternative wiring methods to Chapter 3 and Parts I and III of Article 725 for signaling wiring and Parts 1 and V of Article 770 for optical fiber cabling shall be permitted where all of the following conditions are met:
  1. Disconnecting means complying with 645.10 are provided.
  2. A heating/ventilating/air-conditioning (HVAC) system is provided in one of the methods identified in 645.4(2) a or b.
    1. A separate HVAC system that is dedicated for information technology equipment use and is separated from other areas of occupancy; or
    2. An HVAC system that serves other occupancies and meets all of the following:
      1. Also serves the information technology equipment room
      2. Provides fire/smoke dampers at the point of penetration of the room boundary
      3. Activates the damper operation upon initiation by smoke detector alarms, by operation of the disconnecting means required by 645.10, or by both
      Informational Note: For further information, see NFPA 75-2017, Standard for the Fire Protection of Information Technology Equipment, Chapter 10, 10.1, 10.1.1, 10.1.2, and 10.1.3.
  3. All information technology and communications equipment installed in the room is listed.
  4. The room is occupied by, and accessible to, only those personnel needed for the maintenance and functional operation of the installed information technology equipment.
  5. The room is separated from other occupancies by fire-resistant-rated walls, floors, and ceilings with protected openings.
    Informational Note: For further information on room construction requirements, see NFPA 75-2017, Standard for the Fire Protection of Information Technology Equipment, Chapter 5.
  6. Only electrical equipment and wiring associated with the operation of the information technology room is installed in the room.
Informational Note: HVAC systems, communications systems, and monitoring systems such as telephone, fire alarm systems, security systems, water detection systems, and other related protective equipment are examples of equipment associated with the operation of the information technology room.

Related Code Sections

645.3 Special Equipment, Other Articles
beyond the information technology equipment room shall be subject to the applicable requirements of this Code ...
645.1 Special Equipment, Scope
in an information technology equipment room. Informational Note No. 1: For further information, see NFPA 75-2017, Standard for the Fire Protection ...