User Manual

Preinstallation RF-Orchestra!™ Transmitter Installation and Operation
3-8 6880493G02-C July 2000
Metal monopole towers require a minimum of three eight-foot long ground rods to be driven
into the ground, spaced approximately 10 feet apart. These ground rods may be
exothermically welded to the bottom portion of the mast itself, to the monopole footing, or to
the provided grounding connection tabs.
Site Building and Equipment Grounding
On stand-alone site buildings, a polyvinyl chloride (PVC) conduit (typically 3/4 in.) must be
provided for the interior ground wire to exit the building. For site buildings with floors at
ground level, the conduit must exit a side wall at a 45° angle or less. For buildings with space
below the floors, the conduit may exit through the floor. In both cases, the location of the
opening should be close to the master ground bar inside the site.
Use of metal conduit is discouraged as the conduit provides inductance to a surge, raising the
impedance of the ground. If metal conduit is required by local building codes, both ends of the
conduit must be bonded to the ground wire through the use of grounding clips or other
suitable means to eliminate the inductance of the conduit.
Cabinet Grounding
Within the site, ground each cabinet with a single dedicated connection between each cabinet
and the master ground bar. The connecting wire must be a #2 AWG green-insulated solid
copper wire.
Use two-hole mounting lugs (and split ring washers when possible) with an antioxidant
grease applied for interior grounding connections and exterior secondary grounding
connections. If lock washers are used, they should be placed next to the nut to ensure the
mechanical integrity of the connection. The washer must not be secured between the lug and
the surface to which it is connected. Painted connections must be scraped clean before
applying the antioxidant grease and lug.
Note: The cabinet must be connected to the site ground using a single dedicated ground wire.
Cabinet ground location is at the top rear of the cabinet (see Figure 3-3).
DANGER
To prevent damage to equipment and potential injury to personnel,
never use a bare or damaged wire for the connection of chassis ground
or other electrical wiring.