A low halogen cable that meets the ratings of Telcordia GR-347 is acceptable. Place the
MGB bar as close as possible to the equipment cabinets and the path to ground options
(for example, ground rod, cold water pipe, or building steel). Install the ground bar to
ensure that the wire bending radii for the 4/0 AWG and No. 2 AWG are a minimum of 12
inches and that all paths to ground travel flat or down.
Warning Never allow a path to ground to travel upward.
Cold Water Pipe Option
The location of the cold water main is usually in the basement or in the mechanical room
of the building. When attaching to the pipe, the clamp must come into contact with a
minimum of 4 linear inches of pipe or utilize a Burndy GAR clamp.
To ground a cold water pipe
1. Drill the clamp to accept a two-hole ½ inch hardware lug. You can also connect the
water pipe by attaching the ground conductor using an approved water pipe clamp.
2. Scrape clean the area of contact to the cold water pipe with the clamp. The area must
be free of paint, rust and/or corrosion and coated with an approved anti-oxidation
compound before the clamp is attached to the pipe.
3. Locate the clamp on the interior of the building, within five feet of the cold water pipe
entry point into the building, without any flanges, or pipe connections between the
ground clamp and the pipe building entry point.
Note This is required to ensure good continuity to ground at the point of pipe contact
and building entry.
4. If the connection is made on the output side of the water meter, you can install an
electrical jumper (minimum 4/0 AWG) around the meter to another clamp to provide
a continuous path to ground, in the event the water meter is removed for service.
Building Steel Option
When attaching to building steel for a grounding path, use exothermic weld connections
installed per manufacturer’s recommendation.
Antenna and Coax Grounding - Rooftops
The rooftop antennas (including the GPS and WAN antennas) are grounded by their
mounts and by the ground kits on the coaxial cable connected to the CGBs (Coax Ground
Bars).
Warning Do not install separate antenna ground connections unless
specified by the antenna’s manufacturer.
TDC-0971-011 CCU 100 and Repeater 100 Installation Guide 113
Proprietary and Confidential
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