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GENERATOR OUTPUT AND DERATING CONSIDERATIONS CHAPTER 6: POWER SOURCES 6.9.7 GENERATOR INSTALLATION GROUNDING All generators, fuel storage tanks above or at grade level, and fences discussed within this chapter shall be grounded as described below. 6.9.7.1 INDOOR GENERATOR GROUNDING Generator systems located indoors shall be bonded to the internal grounding system as follows: • Using the intended chassis grounding connection on the generator, the generator shall be bonded to the internal Master Ground Bus Bar in accordance with methods specified in Chapter 5, “Internal Grounding (Earthing).” • A transfer switch (if not part of the generator unit) shall be bonded to the interior Master Ground Bus Bar in accordance with methods specified in Chapter 5, “Internal Grounding (Earthing).” 6.9.7.2 OUTDOOR GENERATOR GROUNDING Generator systems located outdoors shall be bonded to the external grounding system as follows: • Using the intended chassis grounding connection on the generator, the generator shall be bonded to the external site Ground Ring in accordance with methods specified in Chapter 4, “External Grounding (Earthing).” • If a metallic fuel tank is utilized, the fuel tank shall be bonded to the external site Ground Ring in accordance with methods specified in Chapter 4, “External Grounding (Earthing).” • Metallic fencing surrounding the generator installation shall be bonded to the external site Ground Ring in accordance with methods specified in Chapter 4, “External Grounding (Earthing).” • A transfer switch (if not part of the generator unit) is typically installed in the site building or shelter and collocated with the site electrical service panel. In this case, the transfer switch shall be bonded to the interior Master Ground Bus Bar in accordance with methods specified in Chapter 5, “Internal Grounding (Earthing).” 6.9.8 GENERATOR INSTALLATION The generator system shall be installed using all manufacturer's recommended installation practices. In general, observe the following considerations: • In outdoor installations all foundations shall be of proper size to support the load (check local codes for special considerations). • The generator, fuel tank(s), transfer switch/control panel and all associated components shall be securely fastened to the intended foundations. • Fuel lines shall be adequately secured, protected and free of leaks. • All parts of the system shall be installed in such a manner that it shall be easily serviceable without undue safety risk while the equipment is operational. • Installations in earthquake prone areas (Moment Magnitude rating 3 or greater) may require additional fuel, exhaust system and muffler supports. Manufacturer recommendations and local codes shall be followed in these areas. • In earthquake prone areas (Moment Magnitude rating 3 or greater), it is recommended that standby generators be installed on vibration isolators, with flexible cables used for electrical and grounding, and flexible tubing be provided for fuel systems. 6-42 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GENERATOR OUTPUT AND DERATING CONSIDERATIONS 6.9.9 GENERATOR STARTUP Most generators ship without oil and coolant. Many times fuel lines are not connected. An authorized manufacturer's service representative should be used to review the installation, prepare and start the generator. Observe the following considerations: • All fluid levels shall be checked to ensure adequate supply prior to actual startup. • The generator shall be checked for proper voltage and frequency while operating with and without load. These shall be within manufacturer's specifications or no greater than a 3% variation from rated voltages and 5% overall variation from specified frequency. • Setting of all controls within the transfer switch/control panel shall be verified and checked to ensure proper load pickup, transfer, re-transfer and shut down. • The charge rate of the battery charger should be checked. • The exercise clock should be set and proper operation should be verified. The exercise clock shall be set to exercise the generator at a minimum of 30 minutes every 7 days. It is strongly recommended to exercise the generator under full load. • All alarm connections shall be verified and functions tested. • The fuel system and exhaust system shall be checked to ensure there are no leaks. • Check to ensure that all safety shields and covers are in place. • If a UPS system is employed in this configuration, tests shall be conducted to ensure the UPS functions properly when being fed by the generator. If a problem occurs, frequency and voltage tolerances may need to be reviewed. 6.9.10 GENERATOR SAFETY In general, the following safety precautions shall be observed: • All moving parts shall be enclosed or protected. • Safety shields and covers shall be in place except as necessary for service. • Hot surfaces such as engine exhaust pipes and mufflers shall be protected to ensure that there is no accidental contact by foreign material or persons. • “No Smoking”, “Caution: Hearing Protection Required”, and “Automatic equipment, may selfstart” signs shall be posted within a generator room or adjacent to a generator which is located in a room with other equipment. • Points where exhaust system components pass through walls shall have approved feedthrough thimbles installed. • Fuel lines shall be protected from accidental damage. • Electrical circuits shall not be exposed. • Ensure that exhaust gases disperse and are not drawn back into the interior of the building. • All manufacturer's safety guidelines shall be followed during installation and operation. • Ensure that generators installed in earthquake prone areas meet all safety requirements for an installation in that area. 68P81089E50-B 9/1/05 6-43
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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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Page 257 and 258: STANDARDS AND GUIDELINES FOR COMMUN
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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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