Technical Requirements -
Telephone/Data Spaces & Cable Pathways
1. Minimum unobstructed vertical access clearance above trays shall be 4 inches.
Ceiling mounted cable trays shall be accessible from below.
2. Cable tray system shall provide support to station cable to within 30 feet of all
telephone/data outlet drops. From tray to vertical drop, cable shall be supported
by approved "J-hooks", ceiling grid hooks or other approved method in
accordance with ANSI/EIA/TIA standards. "J-hooks" shall be installed by
Cabling Contractor when necessary.
3. Vertical distribution of cable shall be within hollow walls, furred out chase
columns, utility/furniture poles, conduit, wiremold or other approved means.
Telephone/Data - Ducts/Cellular Floors
Telephone/data ducts/cellular floors may be provided as an alternate to cable trays.
1. Telephone/data ducts/cellular floors require a minimum cross sectional area of
one (1) square inch of underfloor duct area (home run) for every two hundred
(200) square feet of usable office floor space served.
2. Telephone/data header ducts shall terminate in the T/D closet, computer room
and Telephone Equipment Room at both backboards and racks with a slot or
elbow as applicable.
3. Cross run ducts should be installed at a maximum spacing of 10 - 15 feet to
allow access to systems furniture without the need to have awkward cable runs
on floor. Each office equipped with under floor ducts or cellular floors should
have a minimum of one distribution duct. Consideration should be given to
approved furniture layout plans.
4. Access or handhole units shall be placed in duct runs to permit changes in
direction and provide access for pulling cables.
5. All under floor ducts/cells must be extended to the wall partition in rooms where
installed and provide an access opening to wall interiors. Access plate shall be
installed on each wall above duct for wire pull access.
6. All underfloor duct systems shall be designed in accordance with Section 4.2 of
ANSI/TIA/EIA 569-A.
Page 4-24
VBA Design Guide
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