14E-6-645 Information technology equipment.

   The provisions of Article 645 of NFPA 70 are adopted by reference with the following modifications:

1.   Revise subsection 645.3(B) to read:

   “Plenums. Section 300.22(C) shall apply to wiring and cabling in other spaces used for environmental air (plenums) in or above an information technology equipment room.”

2.   Revise subsection 645.5(E) to read:

   “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 approved 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, intermediate metal conduit, electrical metallic tubing, metal wireway, surface metal raceway with metal cover, flexible metal conduit, liquidtight flexible metal conduit, and associated metallic boxes or enclosures as permitted in Chapter 3. These supply conductors shall be installed in accordance with the requirements of 300.11.

   (3)   Ventilation in the underfloor area is used for the information technology equipment room only, except as provided in 645.4(2). The ventilation system shall be so arranged, with approved smoke detection devices, that upon the detection of fire or products of combustion in the underfloor space, the circulation of air will cease.

   (5)*   Openings in the raised floor for cords and cables protect cords and cables against abrasion and minimize the entrance of debris beneath the floor.

* Editor's note – As numbered in Coun. J. 9-6-17, p. 55278, § 1. Future legislation will correct the provision if needed.

   (6)   Cables, other than those covered in 645.5(E)(2) and (E)(3), are one of the following:

      a.   Listed DP cable having adequate fire-resistant characteristics suitable for use under raised floors of an information technology equipment room.

      b.   Interconnecting cables enclosed in a raceway.

      c.   Equipment grounding conductors

   Informational Note: One method of defining fire resistance is by establishing that the cables do not spread fire to the top of the tray in the “UL Flame Exposure, Vertical Tray Flame Test” in UL 1685-2011, Standard for Safety for Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables. The smoke measurements in the test method are not applicable.

   Another method of defining fire resistance is for the damage (char length) not to exceed 1.5 m (4 ft 11 in.) when performing the CSA “Vertical Flame Test – Cables in Cable Trays,” as described in CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables.”

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-646 Modular data centers.

   The provisions of Article 646 of NFPA 70 are not adopted.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-647 Sensitive electronic equipment.

   The provisions of Article 647 of NFPA 70 are adopted by reference without modification.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-650 Pipe organs.

   The provisions of Article 650 of NFPA 70 are adopted by reference without modification.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-660 X-ray equipment.

   The provisions of Article 660 of NFPA 70 are adopted by reference without modification.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-665 Induction and dielectric heating equipment.

   The provisions of Article 665 of NFPA 70 are adopted by reference without modification.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-668 Electrolytic cells.

   The provisions of Article 668 of NFPA 70 are adopted by reference without modification.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-669 Electroplating.

   The provisions of Article 669 of NFPA 70 are adopted by reference without modification.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)

14E-6-670 Industrial machinery.

   The provisions of Article 670 of NFPA 70 are adopted by reference without modification.

(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)