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FALL-OF-POTENTIAL METHOD TESTING PROCEDURE APPENDIX D: GROUNDING (EARTHING) ELECTRODE SYSTEM TESTING/VERIFICATION TABLE D-3 REQUIRED Z-PROBE SPACING FOR SITE LENGTHS AND WIDTHS (IN METRES) Site Width (m) Site Length (m) 3 6 9 12 15 18 21 24 27 30 3 43 68.3 96.3 125.6 155.4 185.3 215.5 245.7 276.1 306.3 6 68.3 86.3 110 136.2 164.3 192.6 221.9 251.5 281 310.9 9 96.3 110 129.2 152.4 177.7 204.5 232.3 260.3 289.3 318.2 12 125.6 136.2 152.4 172.5 195 219.8 245.7 272.5 300.2 328.3 15 155.4 164.3 177.7 195 215.5 238 262.1 287.4 313.9 340.8 18 185.3 192.6 204.5 219.8 238 258.8 281 304.8 329.8 355.4 21 215.5 221.9 232.3 245.7 262.1 281 301.8 324 347.5 372.2 24 245.7 251.5 260.3 272.5 287.4 304.8 324 344.8 367 390.4 27 276.2 281 289.3 300.2 313.9 329.8 347.5 367 388 410 30 306.3 310.9 318.2 328.3 340.8 355.4 372.2 390.4 410 431 33 336.8 340.8 347.5 356.6 368.2 381.9 397.5 414.5 433.1 453.2 37 367 371 377 385.6 396.2 409 423.4 439.5 457.2 476 40 397.5 400.8 406.6 414.5 424.6 436.5 449.9 465.1 482 499.9 43 428 431 436.5 443.8 453.2 464.2 447 491.3 507.2 524.3 46 458.1 461.2 466.3 473 482 493 504.4 518.2 533.1 549.6 49 488.6 491.3 496.2 502.6 510.8 520.9 532.2 545.3 559.6 575.2 52 519 521.8 526 532.2 540.1 549.6 560.2 572.7 586.4 601 54.9 549.6 552 556.3 562 569.4 578.2 588.6 600.5 613.3 627.6 57.9 580 582.2 586.4 591.9 598.9 607.2 617.2 628.5 640.7 654.4 60.1 610.2 612.6 616.3 621.8 628.5 636.4 645.9 656.5 668.4 681.5 D-8 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES FALL-OF-POTENTIAL METHOD TESTING PROCEDURE D.3.3.2 SITE AC POWER DISCONNECT REQUIREMENTS This test requires disconnection of the site grounding (earthing) electrode system from the power company grounded conductor (may be a neutral wire). This is required in order to allow testing that is limited only to the site grounding electrode system. Attempting to perform measurements while the site remains connected to the extensive ground/ neutral system of the power company artificially enhances the grounding electrode system reading, resulting in measurement error. Therefore, for an existing site supplied by commercial AC power that contains a neutral wire which is part of an extensive power company grounding system, the following steps must be taken first: 1. Coordinate the test with the customer and/or site owner and all other affected parties. 2. Arrange for the site to have the power company AC power turned off. If the site must remain operational while testing is being done, the site will have to be switched to a back-up power source if it is available. WARNING Check for current on the grounding electrode conductor before disconnecting. Never disconnect the ground of a live circuit. Disconnecting the ground of a live circuit could cause death or severe injury. 3. Have the site grounding electrode system isolated from the power company grounded conductor (may be a neutral wire) by a qualified electrician, ensuring that it has no secondary path to the site via a conduit or other connection (this can be verified with the use of a multi-meter). The only way to achieve this (especially at a communications site with a multi-bonded/multi-grounding electrode system) may be having the power company grounded conductor (may be a neutral wire) disconnected from the site. 4. Remove any other grounding electrode connection that may influence the measurement of the onsite grounding electrode system, such as the telephone company ground connection and metallic water/gas pipes. D.3.3.3 FALL-OF-POTENTIAL TEST PROCEDURE Figure D-4 shows typical ground resistance tester connections and test probe orientations. WARNING Follow ground resistance tester manufacturer's warning and caution information when using tester. Follow furnished instructions when inserting and removing test rods into soil. Make certain this procedure is fully understood before proceeding with test. Perform the fall-of-potential test as follows: 1. On Ground Resistance Tester, connect test leads to the X, Y, and Z terminals. 2. Short the X and Xv connections on the Ground Resistance Tester. 3. Connect the X lead to the grounding electrode system under test. (This is typically via a test clip connection to an external ground bus bar.) 68P81089E50-B 9/1/05 D-9
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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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Page 427 and 428: STANDARDS AND GUIDELINES FOR COMMUN
Page 433 and 434: APPENDIX B SOIL RESISTIVITY MEASURE
Page 467 and 468: APPENDIX C PROTECTING AGAINST ELECT
Page 471 and 472: APPENDIX D GROUNDING (EARTHING) ELE
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Page 503 and 504: APPENDIX F R56 COMPLIANCE CHECKLIST
Page 509 and 510: I NDEX Index Index AC power cabling
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