Site Grounding And Lightning Protection - Motorola MTR2000 T5544 Instruction / Field Service Manual

Installation

Site Grounding and Lightning Protection

STOP
IMPORTANT
Electrical Ground
RF Ground
Lightning Ground
Note
10
Site Grounding Lightning Protection Recommendations
Proper site grounding and lightning protection are vitally important consid-
erations. Failure to provide proper lightning protection may result in perma-
nent damage to the radio equipment.
One of the most important considerations when designing a communications site
is the ground and lightning protection system. While proper grounding techniques
and lightning protection are closely related, the general category of site grounding
may be divided as follows:
Ground wires carrying electrical current from circuitry or equipment at the site is
included in the category of electrical ground. Examples include the ac or dc elec-
trical power used to source equipment located at the site, telephone lines, and
wires or cables connected to alarms or sensors located at the site.
This type of ground is related to the transmission of radio frequency energy to
earth ground. An example of rf grounding is the use of shielding to prevent or at
least minimize the leakage of unwanted rf transmissions from communications
equipment and cables.
Providing adequate lightning protection is critical to a safe and reliable communi-
cations site. Telephone lines, rf transmission cables, and ac and dc power lines
must all be protected to prevent lightning energy from entering the site building.
Although a comprehensive coverage of site grounding techniques and lighting
protection is not within the scope of this manual, there are several excellent indus-
try sources for rules and guidelines on ground and lightning protection at commu-
nications sites.
Motorola recommends the following reference source:
Motorola Quality Standards Fixed Network Equipment
Installation manual, R56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68P81089E50
Equipment Grounding Guidelines
The station is equipped with a ground screw located on the rear of the station
Power Supply module. This screw is used to connect the station to the site ground
point. It is assumed that all telephone lines, antenna cables, and ac or dc power
cabling has been properly grounded and lightning protected by following the rules
and guidelines provided in the above reference.
68P81096E37-N
06/28/05