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EQUIPMENT ANCHORING CHAPTER 9: EQUIPMENT INSTALLATION 9.6.1.3 ISOLATED MOUNTING Anchor Rack Base Insulating washer/ sleeve Isolated mounting is recommended to prevent a second path to ground (ground loop) through the concrete floor, and is required for the installation of certain equipment. In these cases, expansion anchors are inserted into the concrete floor. However, isolation of the equipment rack is ensured using an insulating plate and hardware as shown in Figure 9-4. If the installation is in an earthquake zone, additional anchors are used as shown in Figure 9-4. NOTE: The isolation plate should be made of a insulating material such as fiberglass or polypropylene plastic that will not deteriorate in varied temperature ranges. ANCHOR DETAIL FIGURE 9-4 ISOLATED MOUNTING SYSTEM 9.6.2 MOUNTING ON WOOD OR FIBERGLASS FLOORS 19 in. Relay Rack Anchor NOTE: Four anchors used at corners for standard installation. Six anchors used for seismic installations. Insulating Plate Appropriately sized lag bolts shall be used for mounting on wood or fiberglass floors. If the underside is accessible and the floor stability is questionable, then thru-bolting may be desirable. It is recommend to mount base stations and other non-racked ancillary equipment on a “C-channel” type of mounting track where possible. This provides for easy cleaning and some isolation in the case of standing water. Another benefit of installing non-rack mounted equipment off the floor, is that the weight is distributed across the floor. In these cases, C-channel type mounting provides multiple floor anchor points where the equipment provides only four to six anchor points. 9-8 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES EQUIPMENT ANCHORING 9.6.3 ANCHORING EQUIPMENT TO RAISED FLOORS 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 less than four mounting points. When mounting racks to raised floors, 13 mm (0.5 in.) minimum diameter allthread rod and flush mount expansion anchors shall be used to anchor to the concrete sub-floor. When mounting equipment to a raised floor, 10 mm (0.375 in.) minimum allthread rod and hardware shall be used for anchoring. Mounting arrangement shall be in accordance with rack manufacturer’s instructions. Sandwich the computer floor and equipment rack with nuts and washers as shown in Figure 9-5. When mounting consoles to a raised floor, 10 mm (0.375 in.) minimum diameter allthread rod shall be used for anchoring. EQUIPMENT RACK RAISED FLOOR FLOOR SUPPORT DIAMETER THREAD ROD (TYPICAL) FLUSH MOUNT CONCRETE ANCHOR FIGURE 9-5 ANCHORING EQUIPMENT TO RAISED FLOORS 9.6.4 ANCHORING OVERHEAD AND WALL-MOUNTED EQUIPMENT The anchoring of overhead and wall-mounted devices present a number of considerations. Placement is very important; if equipment is bolted to a wall that is on an aisle, the aisle may be unacceptably narrowed with the danger of injury to personnel. Also, the serviceability of the equipment being mounted to adjacent equipment may be inhibited. Overhead applications generally include coax cabling, cable runways, and mounts for earthquake bracing. All overhead applications should keep in mind loading of overhead surfaces. Care must be exercised when deciding how much can be held up by the ceiling without some sort of building foundation support. In the case of earthquake bracing equipment (discussed in “Seismic Considerations” on page 9-3), cable trays can be secured overhead then affixed to the equipment racks providing acceptable foundation support. 68P81089E50-B 9/1/05 9-9
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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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Page 329 and 330: 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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