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MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING) 4.7.6.3 WOODEN STRUCTURES (POLES) Wooden pole structure towers (and other non-metallic towers) shall minimally be grounded (earthed) as follows: • The wooden pole shall have a vertical grounding conductor installed over the length of the wooden pole. • The vertical grounding conductor shall be constructed of 35 mm 2 csa (#2 AWG) or coarser solid, bare, tinned or un-tinned copper conductor (ANSI T1.334-2002, section 6.5). • The grounding conductor shall be installed in accordance with “Grounding (Earthing) Conductors” on page 4-28. • The vertical grounding conductor shall terminate into a radial grounding conductor or tower ground ring (with rods) (ANSI T1.334-2002, section 6.5). • The radial grounding conductor shall be installed in accordance with “Radial (Counterpoise) Grounding Conductors” on page 4-24. • The tower ground ring shall be installed in accordance with “External Building and Tower Ground Ring” on page 4-22. • Ground rods shall meet the specifications and be installed in accordance with “Ground Rods” on page 4-11. • The wooden pole grounding electrode system shall be bonded to the building grounding electrode system. See “Common Grounding (Earthing)” on page 4-5. WOODEN POLE 35 mm 2 csa (#2 AWG) OR COARSER BARE COPPER CONDUCTOR ROUTED ON OPPOSITE SIDE FROM TRANSMISSION LINE GROUND KITS GROUND RODS FIGURE 4-39 WOODEN POLE GROUNDING ANTENNA TRANSMISSION LINE TO SHELTER 4-58 68P81089E50-B 9/1/05 GRADE
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS 4.7.7 DEDICATED COMMUNICATIONS BUILDING GROUNDING (EARTHING) All dedicated communications buildings shall have a properly installed external grounding (earthing) electrode system. The grounding electrode system resistance shall meet the requirements of “Grounding (Earthing) Electrode System Resistance Requirements” on page 4-46. A typical site grounding electrode system layout is shown in Figure 4-4 on page 4-8. The building grounding electrode system requirements are listed below and shall also include any additional grounding electrode system components required to achieve the resistance requirements of the site. See “Minimum Site Grounding (Earthing) Requirements” on page 4-44. • Installation of concrete encased electrodes as part of new construction. See “Concrete-Encased Electrodes” on page 4-20. • The building shall be encircled by a ground ring installed in accordance with “External Building and Tower Ground Ring” on page 4-22. • The building ground ring shall have a ground rod installed near the external ground bus bar (EGB), at each corner of the shelter, and as follows: • If 2.4 m (8 ft.) ground rods are used, additional ground rods shall be installed as needed to reduce the distance between rods from 3 m to 4.6 m (10 to 15 ft.) (ANSI T1.334-2002). • If longer ground rods are used, a larger separation proportional to the increase in rod length may be used. • Ground rods shall be placed a minimum of one rod length apart along the ground rings (ANSI T1.313-2003, figure 3(a)). • Ground rods shall not be separated from an adjacent ground rod along the ground ring by more than the sum of their respective lengths. (MIL-HDBK-419A). • The ground rods shall be installed in accordance with “Ground Rods” on page 4-11. • The ground rods shall be exothermically welded to the ground ring, or as otherwise allowed in “Bonding to the External Grounding (Earthing) Electrode System” on page 4-40. • The building ground ring shall be bonded to the tower ground ring using a minimum of two 35 mm 2 csa (#2 AWG) or coarser, bare, solid, tinned or un-tinned, copper conductors. See “External Building and Tower Ground Ring” on page 4-22 and Figure 4-4 on page 4-8. • The tower shall be grounded in accordance with “Tower Grounding (Earthing)” on page 4-50. • Determine if radial grounding conductors should be installed at the site, see “Radial (Counterpoise) Grounding Conductors” on page 4-24 4.7.7.1 GENERATORS EXTERNAL TO THE BUILDING Generators installed outside of the building, within 1.8 m (6 ft.) of the building, shall be bonded to the nearest practical location on the grounding (earthing) electrode system as shown in Figure 4-40 on page 4-60, using a 16 mm 2 csa (#6 AWG) or coarser, copper conductor (ANSI T1.334-2002, section 5.3.3). Grounding conductors routed below ground, or partially below ground, shall be a 35 mm 2 csa (#2 AWG) or coarser, bare, solid, tinned or un-tinned, copper conductor. External generator grounding shall comply with the following: • Bonding to the generator chassis shall be done in accordance with the manufacturer's requirements. 68P81089E50-B 9/1/05 4-59
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© 2005 MOTOROLA, INC. ALL RIGHTS R
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TABLE OF CONTENTS Chapter 1. Introd
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STANDARDS AND GUIDELINES FOR COMMUN
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CHAPTER 1 INTRODUCTION 1 This manua
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CHAPTER 2 SITE DESIGN AND DEVELOPME
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CHAPTER 3 COMMUNICATION SITE BUILDI
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CHAPTER 4 EXTERNAL GROUNDING (EARTH
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CHAPTER 6 POWER SOURCES 6 6.1 LOCKO
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CHAPTER 7 SURGE PROTECTIVE DEVICES
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CHAPTER 8 MINIMIZING SITE INTERFERE
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CHAPTER 9 EQUIPMENT INSTALLATION 9
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APPENDIX A ELECTROMAGNETIC ENERGY I
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APPENDIX B SOIL RESISTIVITY MEASURE
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APPENDIX C PROTECTING AGAINST ELECT
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APPENDIX D GROUNDING (EARTHING) ELE
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APPENDIX E GENERAL CONVERSIONS AND
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APPENDIX F R56 COMPLIANCE CHECKLIST
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I NDEX Index Index AC power cabling
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