standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
SPECIAL GROUNDING (EARTHING) APPLICATIONS CHAPTER 4: EXTERNAL GROUNDING (EARTHING) • Electrostatic discharge (ESD) precautions as defined in “Protecting Against Electrostatic Discharge in Equipment Rooms and Dispatch Centers” on page C-1. • External grounding (earthing) as follows: • Grounding electrode system resistance design goal of 5 ohms or less. See “Type “B” Site - Standard Duty” on page 4-45. • Installation of all minimum required grounding electrode system components as described in “External Building and Tower Ground Ring” on page 4-22. • Bonding of all metallic objects as described in “Metallic Objects Requiring Bonding” on page 4-67. • Installation of radial grounding conductors as described in “Radial (Counterpoise) Grounding Conductors” on page 4-24. Radial grounding conductors should be installed regardless if the grounding electrode system resistance is 5 ohms or less without the radial grounding conductors. A minimum of five radial grounding conductors should be installed. 9.1 m (30 ft) MINIMUM BETWEEN TOWER AND BUILDING (PREFERRED) CABLE ENTRY PORT WITHIN 610 mm (2 ft) OF FLOOR (PREFERRED) ICE BRIDGE SIDE VIEW OF BUILDING NOTE: EGB AND COAX GROUNDING NOT SHOWN. FIGURE 4-58 GROUNDING ELECTRODE SYSTEM FOR DISPATCH CENTER CO-LOCATED WITH A TOWER 4-82 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SPECIAL GROUNDING (EARTHING) APPLICATIONS 4.10.2 TWO OR MORE ELECTRICALLY INTERCONNECTED SEPARATE BUILDINGS LOCATED IN THE SAME GENERAL AREA When two or more structures or facilities are located in the same general area (less than 61 m (200 ft.) apart) and are electrically interconnected with the continuous metallic shield of signal, control, RF, or monitor circuits, it is recommended to either provide a common grounding (earthing) electrode subsystem, or interconnect the separate grounding electrode systems with two buried grounding conductors. When installed, the grounding conductors shall be 50 mm 2 csa (#1/0 AWG) or coarser, bare, copper. The buried grounding conductors shall be installed in separate trenches and buried to a minimum depth of 457 mm (18 in.) below grade. Access to the grounding conductor bonding points should include ground test wells. See Figure 4-59, “Ground Test Wells” on page 4-27, and MIL-HDBK- 419A Volume II, section 1.2.3 for additional information. BURIED BARE CONDUCTOR 50 mm 2 (1/0 AWG) OR COARSER MAIN STRUCTURE NEARBY STRUCTURE STRUCTURES SEPARATED 6.1 to 61 m (20 to 200 ft) FIGURE 4-59 TWO ELECTRICALLY INTERCONNECTED BUILDINGS LOCATED IN THE SAME AREA Structures or facilities having no interconnection cables and/or separated by a distance greater than 61 m (200 ft.) generally do not require their grounding electrode systems to be interconnected (MIL- HDBK-419A Volume II, section 1.2.3). Buildings sharing a common tower require bonding of their respective ground rings to the common tower ground ring. 68P81089E50-B 9/1/05 4-83
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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SPECIAL GROUNDING (EARTHING) APPLICATIONS<br />
4.10.2 TWO OR MORE ELECTRICALLY INTERCONNECTED SEPARATE<br />
BUILDINGS LOCATED IN THE SAME GENERAL AREA<br />
When two or more structures or facilities are located in the same general area (less than 61 m (200 ft.)<br />
apart) <strong>and</strong> are electrically interconnected with the continuous metallic shield of signal, control, RF, or<br />
monitor circuits, it is recommended to either provide a common grounding (earthing) electrode<br />
subsystem, or interconnect the separate grounding electrode systems with two buried grounding<br />
conductors. When installed, the grounding conductors shall be 50 mm 2 csa (#1/0 AWG) or coarser,<br />
bare, copper. The buried grounding conductors shall be installed in separate trenches <strong>and</strong> buried to a<br />
minimum depth of 457 mm (18 in.) below grade. Access to the grounding conductor bonding points<br />
should include ground test wells. See Figure 4-59, “Ground Test Wells” on page 4-27, <strong>and</strong> MIL-HDBK-<br />
419A Volume II, section 1.2.3 <strong>for</strong> additional in<strong>for</strong>mation.<br />
BURIED BARE<br />
CONDUCTOR<br />
50 mm 2 (1/0 AWG) OR<br />
COARSER<br />
MAIN STRUCTURE<br />
NEARBY STRUCTURE<br />
STRUCTURES SEPARATED<br />
6.1 to 61 m (20 to 200 ft)<br />
FIGURE 4-59 TWO ELECTRICALLY INTERCONNECTED BUILDINGS LOCATED IN THE SAME AREA<br />
Structures or facilities having no interconnection cables <strong>and</strong>/or separated by a distance greater than 61<br />
m (200 ft.) generally do not require their grounding electrode systems to be interconnected (MIL-<br />
HDBK-419A Volume II, section 1.2.3). Buildings sharing a common tower require bonding of their<br />
respective ground rings to the common tower ground ring.<br />
68P81089E50-B 9/1/05 4-83
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