standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING) 4.7.10.1 FENCE AND GATE GROUNDING (EARTHING) All site fencing, including gates, within 1.8 m (6 ft.) of the grounding (earthing) electrode system (such as building or tower ground ring and radial grounding conductors), or any metallic item grounded to the grounding electrode system, shall be effectively bonded to the external grounding electrode system to help prevent shock hazard to personnel from lightning or other electrical anomalies (ANSI T1.334- 2002, section 5.3.3). In high lightning prone geographical areas, or areas of high soil resistivity, it is recommended to effectively bond fencing that is located within 3 m (10 ft.) of the external grounding electrode system, or within 3 m (10 ft.) of a grounded metallic item (ANSI T1.313-2003, section 10.3.2). When fences are located at an electrical power substation, the fence grounding shall be made as required by local code and by the electric power utility company. The fence grounding should comply with IEEE-STD 80-2000 and is beyond the scope of this document. A fencing grounding scheme is shown below in Figure 4-48 for a typical communications site with a nearby installed perimeter fence system. TOWER GROUND RING TOWER BONDED AT ALL CORNER FENCE POSTS EGB GATE POST EXTERNAL GROUND RING METALLIC FENCE FIGURE 4-48 FENCE BONDING EXAMPLE GATE BONDED TO GATE POST COMMUNICATION SITE 1. The series or daisy chain method, which refers to any method of connection whereby the conductors are connected from one peripheral device to a second and possibly on to a third device in a series arrangement whereby the removal of the second connection point interrupts the ground path from the first device, shall not be used. 4-68 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS The fencing system for a nearby installed fence at a communications site shall be grounded/bonded as follows: • Each corner fence post shall be bonded to the nearest location of the building ground ring using 35 mm 2 csa (#2 AWG) or coarser, bare, solid or stranded, tinned, copper conductors. The grounding conductors shall be buried to the same depth as the building ground ring, wherever practical. See ANSI T1.313-2003, figure 3(a). • The fence fabric near each corner bonding point shall also be bonded to the building ground ring. This bond may be made using the same grounding conductor used for the corner fence post, or by bonding directly to the fence post using approved methods described within this chapter. The fence fabric bond should be made in at least three points down the fence fabric as shown in Figure 4-49 (MIL-HDBK-419A Volume II, section 1.12). DETERRENT WIRE GROUNDING CLAMP EXOTHERMIC WELD CONNECTION FENCE FABRIC GROUNDING CLAMP (1 OF 3) SOFT DRAWN TINNED SOLID COPPER CONDUCTOR BONDING FENCE FABRIC TO GROUND CONDUCTOR GATE JUMPER WITH EXOTHERMIC WELD GROUND CONDUCTOR WITH EXOTHERMIC WELD CONNECT FENCE BONDING CONDUCTOR TO EXTERNAL GROUNDING ELECTRODE SYSTEM USING EXOTHERMIC WELD OR IRREVERSIBLE HIGH-COMPRESSION FITTING FIGURE 4-49 FENCE FABRIC AND DETERRENT WIRING BONDING EXAMPLE 68P81089E50-B 9/1/05 4-69
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MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING)<br />
4.7.10.1 FENCE AND GATE GROUNDING (EARTHING)<br />
All site fencing, including gates, within 1.8 m (6 ft.) of the grounding (earthing) electrode system (such<br />
as building or tower ground ring <strong>and</strong> radial grounding conductors), or any metallic item grounded to the<br />
grounding electrode system, shall be effectively bonded to the external grounding electrode system to<br />
help prevent shock hazard to personnel from lightning or other electrical anomalies (ANSI T1.334-<br />
2002, section 5.3.3). In high lightning prone geographical areas, or areas of high soil resistivity, it is<br />
recommended to effectively bond fencing that is located within 3 m (10 ft.) of the external grounding<br />
electrode system, or within 3 m (10 ft.) of a grounded metallic item (ANSI T1.313-2003, section<br />
10.3.2).<br />
When fences are located at an electrical power substation, the fence grounding shall be made as<br />
required by local code <strong>and</strong> by the electric power utility company. The fence grounding should comply<br />
with IEEE-STD 80-2000 <strong>and</strong> is beyond the scope of this document.<br />
A fencing grounding scheme is shown below in Figure 4-48 <strong>for</strong> a typical <strong>communication</strong>s site with a<br />
nearby installed perimeter fence system.<br />
TOWER GROUND RING<br />
TOWER<br />
BONDED AT ALL<br />
CORNER FENCE POSTS<br />
EGB<br />
GATE POST<br />
EXTERNAL GROUND RING<br />
METALLIC FENCE<br />
FIGURE 4-48 FENCE BONDING EXAMPLE<br />
GATE BONDED<br />
TO GATE POST<br />
COMMUNICATION SITE<br />
1. The series or daisy chain method, which refers to any method of connection whereby the conductors are<br />
connected from one peripheral device to a second <strong>and</strong> possibly on to a third device in a series arrangement<br />
whereby the removal of the second connection point interrupts the ground path from the first device, shall not<br />
be used.<br />
4-68 68P81089E50-B 9/1/05
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