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ENVIRONMENTAL EVALUATION APPENDIX A: ELECTROMAGNETIC ENERGY INFORMATION A.2.4 EME ZONING • Antenna location on roof • Antenna Characteristics • Gain • Aperture Length • Mounting Height Antenna 13 Antenna 1 Antenna 9 Antenna 4 Antenna 14 Antenna 3 Antenna 2 Antenna 10 Antenna 18 Antenna 17 FIGURE A-6 EME ZONE MAP OF A COMPLEX ROOFTOP ANTENNA SITE RoofView calculates and plots a pictorial representation of EME levels. Antenna fields can be expressed directly as a percentage of user selectable MPEs. This is analogous to running a range prediction coverage map. During RF system design an understanding of coverage is important. During site design EME evaluation is important. After the exposure levels are determined an evaluation and classification shall be performed. The classifying of the exposure allows site managers to understand the complete situation and develop procedures to ensure exposure to employees and contractors is maintained below the acceptable limits. Classifying exposure focuses on comparing the levels found against the Occupational/Controlled MPE. As the term indicates, MPE is the maximum permissible exposure an individual should encounter. To further classify areas, a standard color coding can be adopted to clearly show the EME levels. On a site where RF transmitters and their associated antennas are located, it is usually necessary to restrict the access of the general population. This area frequently is bounded by walls, fences, and other natural or man made structures. Within this area three zones (Green, Yellow, and Red) will be used to determine the requirements for compliance to the FCC guidelines. A-10 68P81089E50-B 9/1/05 Antenna 5 Antenna 8 Antenna 11 Antenna 6 Antenna 12 Antenna 7 Antenna 15 Antenna 16 Antenna 19
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES ENVIRONMENTAL EVALUATION A.2.4.1 GREEN ZONE The green zone is any area where the time (as appropriate) and spatial-average is below 20% of the Occupational/Controlled MPE. The areas so classified afford the highest level of protection for individuals working in RF fields. There is no time limit and no special EME safety practices are required for these areas. Individuals working in this zone may need only basic EME awareness. This can be conveyed with signs, plaques, or awareness videos to provide the information necessary to create an awareness and understanding of the environment. Green Zones denote the lowest EME levels at the site. This area is usually associated with equipment rooms, ground areas around towers, and other areas significantly removed from transmitting antennas. The green zone is unique because the exposure levels are below the General Population/Uncontrolled environment MPEs. Care and proper consideration in site design shall be done to ensure these levels are maintained. On high-density sites annual (or more frequently if required) evaluations shall be done to ensure compliance. Equipment rooms and areas around the base of towers shall always be required to have fields low enough to allow a green classification. The verification and certification of this low level may be required on some sites. If locations are discovered in excess of these levels, changes and modifications must be incorporated to maintain green-zone status. Some methods to maintain green-zone levels are: • Proper maintenance of RF transmitters. This includes ensuring all shields are maintained properly and installed correctly. • Not allowing transmit antennas inside equipment rooms or near the ground level of sites. • Ensuring all microwave dishes are directed away from facilities. • Proper use and installation of transmission lines and connectors. When waveguide carrying high power is used, verification of fitting integrity must be performed to ensure there is no RF leakage. A.2.4.2 YELLOW ZONE The yellow zone is any area where the spatial-average is between 20% to 100% of Occupational/ Controlled MPE. While the fields in this area are within acceptable limits, caution must be exercised because nearby locations may exceed the limits. Therefore, individuals in these areas should have heightened awareness and understanding of their potential for exposure. Normally, there will never be a yellow zone without another zone of higher level in the vicinity. Personnel without EME awareness training shall not frequent this area regularly. Only personnel with the proper knowledge and understanding of EME compliance procedures shall be allowed to work in areas designated as yellow zones. Appropriate Caution signs shall be posted to inform personnel of the EME situation. Yellow zones shall be posted to ensure all personnel entering understand the area is controlled. The EME levels in a yellow zone are below the MPE for Occupational/Controlled environments, but not for General Population/Uncontrolled environments. Only individuals who have the knowledge and requirement shall be given access. 68P81089E50-B 9/1/05 A-11
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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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Page 363 and 364: CHAPTER 8 MINIMIZING SITE INTERFERE
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Page 405 and 406: APPENDIX A ELECTROMAGNETIC ENERGY I
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Page 433 and 434: 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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