]2.2.12.4
Grounding
Ground each [master box] [transmitter] by connection from the grounding
terminal connection of the box to either a driven ground rod or a buried,
metallic water pipe. Resistance to ground shall not exceed 10 ohms. Ground
rods shall be the sectional type, copper-encased steel, with a minimum
diameter of 19 mm 3/4 inch and a total length of 3 m 10 feet conforming to
UL 467. The rods shall have a hard, clean, smooth, continuous copper
surface throughout the length of the rod. The copper shall have a minimum
wall thickness of 0.325 mm 0.013 inchat any point on the rod. Ground rods
shall not protrude [more than 75 mm 3 inches] above grade.
[2.2.12.5
Master Box Pedestal
**************************************************************************
NOTE: Select this paragraph for pedestal mounted
telegraphic master boxes.
**************************************************************************
Provide pedestal constructed of galvanized sheet metal with heavy cast iron
base, designed to support the fire alarm box and location light. The shaft
shall be rectangular in cross section with a hollow compartment inside,
readily accessible and containing facilities for installing cable
terminals. Such facilities shall be capable of mounting no less than ten
two-point terminals. The pedestal shall have a suitable red and white
finish of the same shades as those used for the fire alarm boxes.
][2.2.12.6
Radio Master Box Pedestal
**************************************************************************
NOTE: Select this paragraph for pedestal mounted
radio master boxes.
**************************************************************************
Provide pedestal having a round aluminum barrel with a bell base, designed
to support the radio transmitter, location light, and antenna. The bell
base shall contain a compartment with access plate to permit pulling and
splicing of cables in the base.
][2.2.12.7
[Master Box] [Radio Master Box] Location Light
Provide a vaportight type fixture constructed of a cast aluminum housing
and unbreakable, heat resistant, threaded ruby globe. Support light with
12 mm 1/2 inch minimum galvanized steel conduit screwed into the hub on the
top of the master box. Locate light approximately 300 mm one foot above
the master box. Mount light in pendant position. Provide light with a
screw-in, 9-watt minimum compact fluorescent lamp with integral ballast.
]2.2.13
Conduit
2.2.13.1
Rigid Steel Conduit (Zinc-Coated)
ANSI C80.1 or UL 6.
2.2.13.2
Intermediate Metal Conduit (IMC)
UL 1242, zinc-coated steel only.
SECTION 13852N
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