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GENERAL CONSIDERATIONS FOR LAYOUT, WORK AREAS, AND SPACING CHAPTER 9: EQUIPMENT INSTALLATION 9.3 GENERAL CONSIDERATIONS FOR LAYOUT, WORK AREAS, AND SPACING Consideration should be exercised when laying out a site to allow primarily for all code requirements for spacing, and then the most efficient use of space. Special attention shall be given to future expansion with regard to cable runway heights, electrical outlet placement, and equipment placement. Figure 9-1 shows proper equipment layout. FIGURE 9-1 TYPICAL SITE INSTALLATION SHOWING PROPER EQUIPMENT LAYOUTS 9.3.1 SPACING REQUIREMENTS Proper spacing of equipment is essential for efficient use of the room area, ease of maintenance, and safety of personnel. The following specifications have been established to meet the National Fire Protection Associations (NFPA) Code, and the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) standards. Any local regulations, as applicable, shall also be adhered to. • To provide adequate working space, a 0.37 m 2 (576 sq in.) footprint (as measured from facing equipment surfaces) shall be used for combining equipment and upright base station equipment. NOTE: Local codes may require additional clearance than stated above. In such cases, the local code shall prevail. • A 914 mm (36 in.) side aisle shall be maintained around electrical panel boards (NFPA 70-2005, Article 110.26). • A 914 mm to 1.2 m (36 to 48 in.) front, side, and (where applicable) rear aisles are required for servicing interior mounted air conditioners (NFPA 70-2005, Article 110.26, ASHRAE). 9-2 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SEISMIC CONSIDERATIONS • A 762 mm (30 in.) aisle shall be maintained in front of all telephone switching equipment and/or demarcation cabling. A 914 mm (36 in.) aisle shall be maintained in situations where there is telephone switching equipment and/or demarcation cabling on both sides of the aisle (NFPA 70- 2005, Article 110.72). • A 762 mm (30 in.) minimum workspace shall be maintained on all non-egress or aisle ways without equipment described in this section. • A 914 mm (36 in.) aisle shall be maintained between at least one end of an equipment row and building wall or other obstruction; longer aisles may require additional access breaks. Larger aisles and additional access breaks in a row may be required as the row becomes longer, such that a fire in the aisle does not prevent egress. Comply with any codes regarding fire egress specifications. • Ingress and egress to equipment rooms shall conform with NFPA 70-2005 Article 110 and local building and fire codes. • In US installations where a facility is to be normally occupied, American with Disabilities Act (ADA) shall be complied with. Some general requirements of ADA are 914 mm (36 in.) wide doors, ramps and safety rails, 914 mm (36 in.) turn-around clearance for wheelchairs, and specific placement of telephones, fire extinguishers, light switches, etc. Note that ADA compliance in architectural plans may be required in obtaining a construction permit in some localities. 9.4 SEISMIC CONSIDERATIONS Site protection from earthquakes may be required in certain areas. Typically, this would be an area having historical data indicating a Moment Magnitude rating of 3 or 4. Note that areas other than historically prone areas may need consideration. Obviously, addressing such concerns results in increased costs of equipment installation. A certified architect specializing in earthquake-resistant installation shall be consulted for seismic designs and recommendations in areas where the potential loss of the site may outweigh associated costs of earthquake-resistant design. In the United States, it is recommended to consult the US Geological Survey for additional information regarding earthquake probability and historical data for various areas. In other areas, similar consultation should be done. NOTE: US Geological Survey information can be accessed at http://geohazards.cr.usgs.gov Seismic maps are available at: http://www.neic.cr.usgs.gov/ 9.4.1 GENERAL RECOMMENDATIONS Earthquake-resistant design should be contracted to a firm specializing in such work. Follow the design recommendations of the seismic engineering firm. In other cases observe the following general considerations: • Equipment shall not be secured to both the shelter walls and floors, because dissimilar movement between these surfaces is likely in an earthquake. 68P81089E50-B 9/1/05 9-3
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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 323 and 324: STANDARDS AND GUIDELINES FOR COMMUN
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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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