645-Information Technology Equipment

645.1 Scope. This article covers equipment, power- supply wiring, equipment interconnecting wiring, and grounding of information technology equipment and systems, including terminal units, in an information technology equipment room.

FPN: For further information, see NFPA 75-2003, Stan- dard for the Protection of Information Technology Equipment.

645.2 Definition.

Abandoned Supply Circuits and Interconnecting Cables. Installed supply circuits and interconnecting cables that are not terminated at equipment and not identified for future use with a tag.

645.4 Special Requirements for Information Technol ogy Equipment Room. This article shall apply, provided all of the following conditions are met:

(1) Disconnecting means complying with 645.10 are provided.

(2) A separate heating/ventilating/air-conditioning (HVAC) system is provided that is dedicated for information technology equipment use and is separated from other areas of occupancy. Any HVAC system that serves other occupancies shall be permitted to also serve the information technology equipment room if fire/smoke dampers are provided at the point of penetration of the room boundary. Such dampers shall operate on activation of smoke detectors and also by operation of the disconnecting means required by 645.10.

FPN: For further information, see NFPA 75-2003, Stan- dard for the Protection of Information Technology Equip- ment, Chapter 10, 10.1, 10.1.1, 10.1.2, and 10.1.3.

(3) Listed information technology equipment is installed.

(4) The room is occupied only by 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.

FPN: For further information on room construction re- quirements, see NFPA 75-2003, Standard for the Protection of Information Technology Equipment, Chapter 5.

645.5 Supply Circuits and Interconnecting Cables.

(A) Branch-Circuit Conductors. The branch-circuit con- ductors supplying one or more units of a data processing system shall have an ampacity not less than

125 percent of the total connected load.

(B) Cord-and-Plug Connections. The data processing system shall be permitted to be connected to a branch circuit by any of the following listed means:

(1) Flexible cord and attachment plug cap not to exceed 4.5 m (15 ft).

(2) Cord set assembly, where run on the surface of the floor, shall be protected against physical damage.

(C) Interconnecting Cables. Separate data processing units shall be permitted to be interconnected by means of listed cables and cable assemblies. Where exposed to physical damage, the installation shall be protected by approved means.

(D) Under Raised Floors. Power cables, communications cables, connecting cables, interconnecting cables, cord-and-plug connections, and receptacles associated with the information technology equipment shall be permitted under a raised floor, provided the following conditions are met:

(1) The raised floor is of suitable construction, and the area under the floor is accessible.

(2) The branch-circuit supply conductors to receptacles or field-wired equipment are in rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, electrical metallic tubing, electrical nonmetallic tubing, metal wireway, nonmetallic wireway, surface metal raceway with metal cover, nonmetallic surface raceway, flexible metal conduit, liquidtight flexible metal conduit, or liquidtight flexible nonmetallic conduit, Type MI cable, Type MC cable, or Type AC cable. These

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645-Information Technology Equipment

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645.1 Scope. This article covers equipment, power- supply wiring, equipment interconnecting wiring, and grounding of information technology equipment and systems, including terminal units, in an information technology equipment room.

645.2 Definition.

Abandoned Supply Circuits and Interconnecting Cables. Installed supply circuits and interconnecting cables that are not terminated at equipment and not identified for future use with a tag.

645.4 Special Requirements for Information Technol ogy Equipment Room. This article shall apply, provided all of the following conditions are met:

FPN: For further information on room construction re- quirements, see NFPA 75-2003, Standard for the Protection of Information Technology Equipment, Chapter 5.

645.5 Supply Circuits and Interconnecting Cables.

(A) Branch-Circuit Conductors. The branch-circuit con- ductors supplying one or more units of a data processing system shall have an ampacity not less than

(B) Cord-and-Plug Connections. The data processing system shall be permitted to be connected to a branch circuit by any of the following listed means:

645-Information Technology Equipment

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645.1 Scope. This article covers equipment, power- supply wiring, equipment interconnecting wiring, and grounding of information technology equipment and systems, including terminal units, in an information technology equipment room.

645.2 Definition.

Abandoned Supply Circuits and Interconnecting Cables. Installed supply circuits and interconnecting cables that are not terminated at equipment and not identified for future use with a tag.

645.4 Special Requirements for Information Technol ogy Equipment Room. This article shall apply, provided all of the following conditions are met:

FPN: For further information on room construction re- quirements, see NFPA 75-2003, Standard for the Protection of Information Technology Equipment, Chapter 5.

645.5 Supply Circuits and Interconnecting Cables.

(A) Branch-Circuit Conductors. The branch-circuit con- ductors supplying one or more units of a data processing system shall have an ampacity not less than

(B) Cord-and-Plug Connections. The data processing system shall be permitted to be connected to a branch circuit by any of the following listed means:

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