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SEISMIC CONSIDERATIONS CHAPTER 9: EQUIPMENT INSTALLATION • Mounting should provide for some “sway” in the overall equipment mounting, thereby absorbing the energy of an earthquake. This is typically accomplished by rigid mounting of racked equipment or cabinets at the base, while semi-rigidly attaching the rack top using 3.2 mm (0.125 in.) diameter steel braided wire rope. Wire rope anchors are then secured to ceilings joists. The benefit of this type of installation is that racks are allowed to sway within limits but can't fall over. Cables and transmission lines shall be installed to allow the equipment rack to sway. • Cabinet designs with wide footprints can be used to help prevent cabinets from tipping over. • Columns of cabinets stacked and bolted back-to-back present a very stable and wide footprint. The bottom cabinets shall still, however, be bolted to the floor for complete security. • Some cabinets can be outfitted with outrigger-type support legs to prevent tip-over. These outriggers alone do not provide adequate earthquake protection, but are typically adequate if the cabinet is bolted to the floor. NOTE: If a rack is seismic rated, any add-on aftermarket equipment or equipment that is not seismic rated will render the overall package as not being seismic tested and certified as a unit. Therefore, the unit would no longer be considered as seismic rated. • All ancillary equipment that is not mounted in a rack or cabinet, such as CRTs or control stations, shall be securely fastened to a mounting structure. • When bolting down to raised computer flooring, be sure to anchor all the way to the sub-floor. • Columns of cabinets must be supported, though not rigidly. Rigid mounting will result in extreme vibration and resultant mechanical failure during an earthquake. Semi-rigid mounting is preferred. Semi-rigid bracing is defined as bracing which allows a measurable amount of movement. • Some raised computer floors lose mechanical integrity if several panels are simultaneously removed. This could lead to equipment floor collapse during an earthquake. The flooring manufacturer shall be consulted for floor removal procedures. Raised flooring systems appropriate for the seismic zone shall be used. • Equipment shall be stabilized by a top support. This is critical in preventing a column of equipment from toppling, causing injury to personnel. The footings of cabinet columns and racks shall be bolted to the floor as appropriate, using concrete anchors. Sometimes the cabinet columns are placed on C-channel tracks or wooden pedestals. • Lighting fixtures should be prevented from swaying by addition of one or more guy wires. A fluorescent lighting fixture in particular, can be very dangerous if allowed to swing against a wall or equipment racks, shattering and spraying broken glass below. Fluorescent lighting fixtures shall have protective lenses or protective plastic sleeves which cover the fluorescent tube, preventing broken glass from falling on occupants. • Storage cabinets shall be secured to prevent upset. Storage cabinets shall also have closable, secured doors to prevent contents from spilling during an earthquake. • Ladders and other large objects shall be secured to a wall or removed from the equipment room when not in use. These items have been known to fall into “live” equipment during earthquakes. 9-4 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES EQUIPMENT MOUNTING PLUMB AND SQUARENESS 9.5 EQUIPMENT MOUNTING PLUMB AND SQUARENESS • Equipment shall be level and plumb. Equipment level shall be tested on a known flat surface in at least two directions to verify accuracy. • Equipment shall be parallel or perpendicular to the surrounding walls and adjacent installed equipment. 9.6 EQUIPMENT ANCHORING Anchoring is the mechanical fastening of the communications equipment to suitable locations using hardware acceptable for the application. Although every installation is unique, certain methods for anchoring shall be adhered to for all installations. Typically, at least four anchor points shall be used on each item of equipment mounted to the floor. (The only exception is when the equipment manufacturer supplies other than four mounting points.) NOTE: Where seismic concerns exist (Moment Magnitude rating 3 or greater), see “Seismic Considerations” on page 9-3 for additional information and requirements. FIGURE 9-2 TYPICAL EQUIPMENT ANCHOR KIT 68P81089E50-B 9/1/05 9-5
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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 325 and 326: 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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