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CLAMP-ON OHMMETER TESTING PROCEDURE APPENDIX D: GROUNDING (EARTHING) ELECTRODE SYSTEM TESTING/VERIFICATION NOTE: The neutral wire is used for a measurement because it is the only point in a site where all of the site grounding connections are common over a single conductor. As such, measuring at this point allows the clamp-on ohmmeter to “view” all of the various connections as one single grounding electrode. In many cases, the first neutral-ground bonding point may not be at the site building electrical service panel, but rather at the meter box where the neutral is bonded to the conduit that enters the building. As such, service that uses a PVC conduit typically has the first neutral-ground bonding point at the electrical service panel; service that uses metallic conduit may have the first neutralground bonding point at the meter. If a measurement is attempted at the electrical service panel where neutral-ground bonding is at the meter, an erroneous closed-loop reading on the meter will result instead of a reading of the grounding electrode system. NOTE: See the meter user's manual to determine a meter indication, if any, showing that the meter is reading a closed loop rather than the actual grounding electrode system. The closed loop reading may be caused by a ground loop through a conduit, electrical service meter base or any other electrical panel board. It can also be an indication that there is another utility connected, such as a water pipe or the Telephone Company ground. Ground Bus 4. Depending on location of first neutral-ground bonding point, attach the clamp-on ohmmeter around the neutral wire as shown in Figure D-9 or Figure D-10. 5. Set the meter to the Amps scale and verify there is no significant current on the neutral wire. 6. Set the meter to the Ohms scale and note the reading; if no noise or other errors are indicated on the meter, this is the resistance of the grounding electrode system under test. Record the reading on the photocopy of the clamp-on ohmmeter/ammeter test worksheet (page D-25). Main Panel To Master Ground Bus Neutral Bus First Point of Neutral-Ground Bond Neutral-Ground Main Bonding Jumper Ground Connection to Multi-bonded/Multigrounding Electrode System FIGURE D-9 CLAMP-ON OHMMETER PLACEMENT FOR MULTI-BONDED/MULTI-GROUNDING ELECTRODE SYSTEM (NEUTRAL-GROUND BOND AT SERVICE PANEL) D-18 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES CLAMP-ON OHMMETER TESTING PROCEDURE Neutral bonding inside meter box makes reading taken in building impossible. Reading must be taken on the power company side of this bond. Electrical Meter FIGURE D-10 CLAMP-ON OHMMETER PLACEMENT FOR MULTI-BONDED/MULTI-GROUNDING ELECTRODE SYSTEM (NEUTRAL-GROUND BOND AT METER BOX) Reading must be taken on the power company side of this bond. Electrical Meter Clamp-on Ohmmeter placed around Neutral on service feed Place Clamp-on Ohmmeter around Neutral on service feed. FIGURE D-11 CLAMP-ON OHMMETER PLACEMENT FOR MULTI-BONDED/MULTI-GROUNDING ELECTRODE SYSTEM (OVERHEAD SERVICE) 68P81089E50-B 9/1/05 D-19
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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 5 INTERNAL 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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Page 437 and 438: STANDARDS AND GUIDELINES FOR COMMUN
Page 467 and 468: APPENDIX C PROTECTING AGAINST ELECT
Page 471 and 472: APPENDIX D GROUNDING (EARTHING) ELE
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Page 497 and 498: APPENDIX E GENERAL CONVERSIONS AND
Page 503 and 504: APPENDIX F R56 COMPLIANCE CHECKLIST
Page 509 and 510: I NDEX Index Index AC power cabling
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