Page 188 of Cooper B-Line Spring Steel Fasteners by Cooper Industries

TIA/EIA Requirements 186 Reprinted with permission from NFPA 70-2005, the National Electrical Code , Copyright 2005, National Fire Pro t e c t i o n Association, Quincy, MA 02269. This reprinted material is not the complete and official position of the National Fire Pro t e c t i o n Association, on the re f e renced subject which is re p resented only by the standard in its entire t y. A N S I T I A E I A 5 6 9 A 4. Horizontal pathways and related spaces 4.6 Ceiling pathway 4.6.2 Design guidelines 4.6.2.1 Planning. The design shall provide a suitable means for supporting cable from the telecommunications closet to the work areas to be s e rved. Cable shall not be laid directly on the ceiling tile or rails. 4.6.2.2 Clearance. A minimum of 75 mm (3 in.) clear vertical space shall be available above the ceiling tiles for the horizontal cabling and pathway. (See Figure 33) 4.6.5 Cable support 4.6.5.1 W h e re zone conduit or cable tray is not available in a suspended ceiling space and where telecommunications cables are allowed to be placed in the ceiling, adequate open-top cable s u p p o rts, located on 1220-1525 mm (48-60 inch) centers, shall be provided. Where larger quantities of cables (50-75 cables) bunched together in the ceiling at a congested area, such as close to the telecommunications closet, special supports shall be designed and installed to carry the additional weight. (See Figures 33 34) 4.6.5.2 A suspended ceiling support rod or wire may be used to mount appropriate cable fasteners loaded with multiple cables up to the total weight for which the fastener is approved. The T-bar rail of a suspended ceiling may be used to mount a p p ropriate cable fasteners loaded with cable up to a total weight of 0.7 kg/m (0.45 lb/ft). The fastener design shall not interf e re with the i n s e rting or removing of the ceiling tile. (See Figures 33 34) N O T E S 1 ) A weight of 1.0 kg (2.2 lbs.) or 0.7 kg/m with spacing of support wire rod at 1.5 m (5 ft.) is equivalent to a bundle of sixteen 4-pair 24 AW G UTP cables, including fasteners. 2 ) If any side pull is exerted on the support wire, like a turn in direction of the cables, the level of the ceiling tee rail could be aff e c t e d .

[close]