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 MIL-HDBK-1012/3
1.5.1.4
Access Floors. Access floors (raised or computer
flooring) provide a convenient means of interconnecting
telecommunications equipment. They are composed of antistatic
modular floor panels supported by pedestals which may or may not
be braced.
a)
Access floors afford the designer the following
advantages:
(1)
Handle high cable densities;
(2)
Pathway is easily accessible;
(3)
Offer least cost solution for making moves,
adds/changes;
(4)
Aesthetically acceptable; and
(5)
Provide an enclosed plenum for HVAC feed or
return.
b)
Disadvantages of access floors include the
following:
(1)
High initial cost;
(2)
Reverberate sound; and
(3)
If left removed or with unused holes, create a
personnel hazard.
c) Access floors should be braced with stringers in
areas where floor panels are frequently removed or the access
floor is greater than 6 in. off the finished floor. Floor
loading must be designed in accordance with EIA/TIA 569, Table
A1-1. Access floors required ramps for equipment carts and
handicapped access. These ramps require excessive space. In new
construction the area to receive a raised floor shall be
depressed to a depth equal to the height of the access floor.
The height of the access floor in an office space should be a
minimum of 155 mm (6 in.). In a computer or equipment room, or
where the area beneath the floor is used as an HVAC plenum the
minimum height of the access floor shall be 310 mm (12 in.) in
accordance with EIA/TIA 569, par. 4.3.3.2.1.
d) Metal parts of access floors shall be UL listed and
bonded to ground in accordance with EIA/TIA 569, par. 4.3.4.4.
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