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1.6Site Grounding and Lightning Protection
Proper site grounding and lightning protection are vitally important
!considerations. Failure to provide proper lightning protection may result in W A R N I N G permanent 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 into the following section.
1.6.1Electrical Ground
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 electrical power used to source equipment located at the site, and wires or cables connected to alarms or sensors located at the site.
1.6.2RF Ground
This type of ground is related to the bypassing of unwanted 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 energy from communications equipment and cables.
1.6.3Lightning Ground
Providing adequate lightning protection is critical to a safe reliable communications site. RF transmission cables, and AC and DC power lines must all be protected to prevent lightning energy from entering the site.
Comprehensive coverage of site grounding techniques and lightning protection is not within the scope of this instruction manual, but there are several excellent industry sources for rules and guidelines on grounding and lightning protection at communications sites.
NOTE: Motorola recommends the following reference source: Motorola Quality Standards Fixed Network Equipment
Installation Manual R56……………………...……………......................................6881089E50
1.6.4Equipment Grounding
The repeater is equipped with a ground screw located on the rear of the repeater power supply module. This screw is used to connect the repeater to the site grounding. All antenna cables, and AC and DC power cabling, should be properly grounded and lightning protected by following the rules and guidelines provided in the above reference. Failure to provide proper lightning protection may result in permanent damage to the radio equipment.
6816814H01 | March 2009 |