Code Change Summary: Requirements all throughout Article 645 for information technology (IT) equipment have seen extensive changes.
With all of the new code changes in Article 645, electricians installing or working in IT rooms would do best reading all 4 pages of Article 645 from beginning to end to become familiar with the new revisions. Below are some highlights:
Below is a preview of the NEC®. See the actual NEC® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2017 NEC® edition of NFPA 70.
2017 Code Language:
N 645.5(E)(1) Installation Requirements for Branch Circuit Supply Conductors Under a Raised Floor.
(a) The supply conductors shall be installed in accordance with the requirements of 300.11.
(b) In addition to the wiring methods of 300.22(C), the following wiring methods shall also be permitted:
(1) Rigid metal conduit
(2) Rigid nonmetallic conduit
(3) Intermediate metal conduit
(4) Electrical metallic tubing
(5) Electrical nonmetallic tubing
(6) Metal wireway
(7) Nonmetallic wireway
(8) Surface metal raceway with metal cover
(9) Surface nonmetallic raceway
(10) Flexible metal conduit
(11) Liquidtight flexible metal conduit
(12) Liquidtight flexible nonmetallic conduit
(13) Type MI cable
(14) Type MC cable
(15) Type AC cable
(16) Associated metallic and nonmetallic boxes or enclosures
(17) Type TC power and control tray cable
N 645.5(E)(3) Installation Requirements for Optical Fiber Cables Under a Raised Floor. In addition to optical fiber cables installed in accordance with 770.113(C), Types OFNR, OFCR, OFN, and OFC shall be permitted under raised floors.
N 645.18 Surge Protection for Critical Operations Data Systems. Surge protection shall be provided for critical operations data systems.
One of the following branch circuit wiring methods is NOT permitted under the raised floor in an IT room. Which of the following wiring methods is NOT permitted under the raised floor in an IT room?
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