SBC-812-000-027 Issue 0, May 2003 Grounding and Bonding Requirements for Network Facilities Proprietary i Not for use or disclosure outside SBC Communications Inc. except under written agreement. SBC-812-000-027 Issue 0, May 2003 Table of Contents Section 1 Definitions, General Requirements & Material Requirements Section .............................................................................................................. Page 1.1 SCOPE ...................................................................................................... 1 1.2 GENERAL ................................................................................................. 1 1.3 DEFINITIONS AND ACRONMYS ............................................................. 1 1.4 GROUND RODS ....................................................................................... 7 1.4.1 Construction .......................................................................................... 7 1.4.2 Dimensions ........................................................................................... 7 1.5 CONDUCTORS ......................................................................................... 8 1.5.1 Exterior Buried Conductors ................................................................... 8 1.5.2 Equipment Grounding Conductors ........................................................ 8 1.5.3 AC Equipment Grounding Conductors .................................................. 8 1.5.4 Grounding Conductors Within Equipment Bays .................................... 9 1.5.5 Grounding Conductor Color .................................................................. 9 1.6 CONNECTORS & CONDUIT BONDING DEVICES ................................. 9 1.6.1 Exothermic Welding .............................................................................. 9 1.6.2 Clamp Type Pipe Connectors & Conduit Bonding Devices .................. 10 1.6.3 Crimp (Compression) Connectors ........................................................ 10 1.6.4 Pressure Type (Mechanical) Connectors .............................................. 11 1.6.5 Parallel Cable Connectors .................................................................... 11 1.6.6 Miscellaneous Connectors .................................................................... 11 1.6.7 Solder Type Connectors ....................................................................... 12 1.7 BUS BARS ................................................................................................ 13 1.7.1 Construction .......................................................................................... 13 1.7.2 Dimensions ........................................................................................... 13 1.8 INSTALLATION REQUIREMENTS .......................................................... 13 1.8.1 General Requirements - Routing and Supporting Conductors ............. 13 1.8.2 Connecting and Identifying Conductors ................................................ 16 1.8.3 Application of Lock Washers for Grounding Connections ..................... 17 Section 2 Office Ground Electrodes, Vertical & Horizontal Equalizers, and AC Service and Distributtion 2.1 SCOPE ...................................................................................................... 19 2.2 EARTH ELECTRODES ................................................................................ 19 2.2.1 Public and Private Water Systems ....................................................... 19 2.2.2 Water Well Metallic Casing ................................................................... 20 2.2.3 Driven Ground Electrodes ..................................................................... 22 ii Proprietary Not for use or disclosure outside SBC Communications Inc. except under written agreement. SBC-812-000-027 Issue 0, May 2003 Section .............................................................................................................. Page 2.2.4 Other Electrodes ................................................................................... 24 2.2.5 Interbonding of Earth Electrodes .......................................................... 25 2.3 DRIVEN GROUND SYSTEM FOR RADIO SITES ................................... 25 2.4 CENTRAL OFFICE GROUND SYSTEM .................................................. 25 2.4.1 Office Principal Ground Point (OPGP) ................................................. 26 2.4.2 Interbonding ......................................................................................... 28 2.4.3 Design Parameters - Vertical Riser ...................................................... 29 2.4.4 Design Parameters - Horizontal Equalizer ............................................ 33 2.4.5 CO Ground Bus Bars ........................................................................... 34 2.4.6 Designation of OPGP & CO GRD Bus Bars ......................................... 35 2.4.7 Office Drawings ..................................................................................... 35 2.5 ROUTING AND SUPPORT OF EQUALIZER CONDUCTORS ............... 35 2.6 BUILDING ENGINEERING ...................................................................... 36 2.7 AC SYSTEM GROUNDING ...................................................................... 36 2.7.1 Grounding Electrode Conductor ........................................................... 36 2.7.2 Main Bonding Jumper .......................................................................... 37 2.7.3 Grounding of Separately Derived AC Systems .................................... 37 2.8 AC EQUIPMENT GROUNDING ................................................................ 38 2.8.1 Feeder and Branch Circuit Equipment Grounding ............................... 38 2.8.2 Extending ACEG Conductors .............................................................. 41 2.8.3 AC Power Distribution Cabinets ........................................................... 41 2.8.4 AC Bus duct System ............................................................................ 42 2.8.5 Engine-Alternator Sets ......................................................................... 42 2.8.6 Grounding of AC Tap Boxes ................................................................ 43 2.8.7 Cord Connected AC Operated Equipment ........................................... 43 2.8.8 Job Drawings, Architectural ................................................................. 44 Section 3 Power Plants and Equipment, Transport and Miscellaneous Equipment 3.1 SCOPE ..................................................................................................... 45 3.2 GENERAL ................................................................................................. 45 3.2.1 An Overview of Power and Grounding Systems .................................. 45 3.3 DC POWER SYSTEMS ............................................................................ 46 3.3.1 Battery and Converter Plants, DC-DC Converters ............................... 46 3.3.2 140-Volt Power Plant and Distribution System .................................... 48 3.3.3 Power System Equipment Grounding .................................................. 49 3.3.4 Engine Alternator Equipment ............................................................... 50 3.4 POWER DISTRIBUTION SYSTEMS ....................................................... 51 3.4.1 Battery Distributing Fuse Board (BDFB) .............................................. 52 3.4.2 Fuse Boards (F BD) ............................................................................. 53 3.5 Transport, Information Technology and Miscellaneous Equipment .. 54 Section .............................................................................................................. Page Proprietary iii Not for use or disclosure outside SBC Communications Inc. except under written agreement. SBC-812-000-027 Issue 0, May 2003 3.5.1 Equipment Enclosure and Unit Requirements ...................................... 54 3.5.2 Lineup Conductors ............................................................................... 56 3.5.3 Bonds to Ironwork and Other Metallic Objects ..................................... 57 3.5.4 Other Systems ..................................................................................... 58 3.5.5 Bay Ground Lead ................................................................................. 58 3.5.6 Conduits, Armored Cable, and Shielded Wire for Other Than AC Service ................................................................... 58 3.6 DISTRIBUTING AND PROTECTOR FRAMES ........................................ 59 3.7 CABLE ENTRANCE FACILITY (CEF) ..................................................... 60 3.8 CABLE REARRANGEMENT FACILITY .................................................. 60 3.9 FIBER OPTIC CABLE TERMINATION EQUIPMENT ............................. 61 3.10 NETWORK EQUIPMENT ON RAISED FLOORS ..................................... 62 3.10.1 General .............................................................................................. 62 3.10.2.Horizontal Equalizer Conductor ......................................................... 63 3.10.3.Isolated Bonding Network Equipment ............................................... 63 3.10.4.Common Bonding Network Equipment ............................................. 64 3.10.5.Cable Rack Bonds ............................................................................