UFC 4-133-01N
24 February 2005
Provide safe access for walking around the exterior of the control cab to facilitate
exterior observations, window washing, etc. Use guardrails with vertical painted
or galvanized metal balusters (38 mm [1.5 in]) system at a minimum of 100 mm
(4 in.) The 4-inch sphere rule does not apply to the railing systems on the catwalk
or roof. These areas are considered maintenance areas and the railing should
comply with the regulations for maintenance areas. The exterior catwalk can be
a galvanized-metal or aluminum grate that allows snow to melt directly through
without building up at the edge.
2-5.3.6
For ATCTs that have a tower cab floor height of 30.48 m (100 ft.) to the cab floor,
or less, use a hydraulic elevator. For ATCTs that have a cab floor height of over
30.5 m (100 ft.), use traction-type elevator. Refer to ITG 01-1, Elevator Design
Guide.
2-5.3.7
Retractable Covers.
Electrically operated retractable covers for tower cab windows at sites prone to
hurricane and typhoon conditions. Electrically operated covers will have a
method to mechanically open the covers in case of malfunction.
2-5.3.8
Electrical Hoist.
Provide a 226 Kg (500lb) capacity, remote controlled commercially available
electric hoist in the tower cab. Suspend hoist from tower cab roof framing over
the floor hatch. Coordinate posted hoist capacity with the cab floor hatch
described in paragraph 2-5.3.4 to ensure that the cab floor hatch is not
overloaded by lifted items. Post appropriate administrative controls for the hoist
and the floor access hatch
2-5.3.9
Raceway.
See SSCC FRD. Provide a cable raceway to tower cab roof through tubular cab
roof columns. A cable raceway running horizontally around the roof through
tubular steel section attached to the cab roof columns as part of the overall cab
structural system. The horizontal tubular steel can either be placed at 1066 mm
(42 in.) above the roof or lower with a metal guardrail attached to the tubular
steel to a height of 1066 mm (42 in.) above the roof. The tubular steel can be
used as a passageway for wiring to communication antennas on the roof
perimeter. Base cable layout on distances from the inside of cab windows to
back of consoles should be from 381 to 457 mm (15 to 18 in), maximum.
(Consider the use of aluminum or steel, unfilled, access flooring in tower cab.)
2-5.3.10
Interior Walls.
Provide fire-rated walls for stair enclosure, plumbing and electrical chases.
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