Article 645 covers equipment, power-supply wiring, equipment interconnecting wiring, and grounding of IT equipment and systems in an IT equipment room.
Interconnecting cables under raised floors that support information technology equipment shall be Type _____.
a) RF
b) UF
c) LS
d) DP
See answer and applicable Code reference
The correct answer is: d) DP
Article 645 covers equipment, power-supply wiring, equipment interconnecting wiring, and grounding of IT equipment and systems in an IT equipment room. Section 645.5 outlines the requirements for supply circuits and interconnecting cables. As noted in the first sentence of Sec. 645.5(E)(6), "Cables, other than those covered in (E)(2) and (E)(3), and those complying with (E)(6)(a) or (E)(6)(b), shall be listed as Type DP cable having adequate fire-resistant characteristics suitable for use under raised floors of an information technology equipment room."
About the Author
Mike Holt
Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.
