Laserfiche WebLink
ST. BARBARA CATHOLIC SCHOOL TASK 2 75-24272-01 <br />DIOCESE OF ORANGE SEPTEMBER 12TH, 2024 <br />SANTA ANA, CA BID & PERMIT SET <br /> <br />GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 260526 - 4 <br />B. Grounding Manholes and Handholes: Install a driven ground rod through manhole or handhole <br />floor, close to wall, and set rod depth so 4 inches will extend above finished floor. If necessary, <br />install ground rod before manhole is placed and provide No. 1/0 AWG bare, tinned-copper <br />conductor from ground rod into manhole through a waterproof sleeve in manhole wall. Protect <br />ground rods passing through concrete floor with a double wrapping of pressure-sensitive <br />insulating tape or heat-shrunk insulating sleeve from 2 inches above to 6 inches below concrete. <br />Seal floor opening with waterproof, nonshrink grout. <br />C. Grounding Connections to Manhole Components: Bond exposed-metal parts such as inserts, <br />cable racks, pulling irons, ladders, and cable shields within each manhole or handhole, to <br />ground rod or grounding conductor. Make connections with No. 4 AWG minimum, stranded, <br />hard-drawn copper bonding conductor. Train conductors level or plumb around corners and <br />fasten to manhole walls. Connect to cable armor and cable shields as recommended by <br />manufacturer of splicing and termination kits. <br />D. Pad-Mounted Transformers and Switches: Install two ground rods and ground ring around the <br />pad. Ground pad-mounted equipment and noncurrent-carrying metal items associated with <br />substations by connecting them to underground cable and grounding electrodes. Install tinned- <br />copper conductor not less than No. 2 AWG for ground ring and for taps to equipment grounding <br />terminals. Bury ground ring not less than 6 inches from the foundation. <br />3.3 EQUIPMENT GROUNDING <br />A. Install insulated equipment grounding conductors with all feeders and branch circuits sized per <br />C.E.C. Table 250-122. <br />B. Install insulated equipment grounding conductors with the following items, in addition to those <br />required by CEC: <br />1. Feeders and branch circuits. <br />2. Lighting circuits. <br />3. Receptacle circuits. <br />4. Single-phase motor and appliance branch circuits. <br />5. Three-phase motor and appliance branch circuits. <br />6. Flexible raceway runs. <br />7. Armored and metal-clad cable runs. <br />8. Busway Supply Circuits: Install insulated equipment grounding conductor from <br />grounding bus in the switchgear, switchboard, or distribution panel to equipment <br />grounding bar terminal on busway. <br />9. Computer and Rack-Mounted Electronic Equipment Circuits: Install insulated equipment <br />grounding conductor in branch-circuit runs from equipment-area power panels and <br />power-distribution units. <br />C. Air-Duct Equipment Circuits: Install insulated equipment grounding conductor to duct- <br />mounted electrical devices operating at 120 V and more, including air cleaners, heaters, <br />dampers, humidifiers, and other duct electrical equipment. Bond conductor to each unit and to <br />air duct and connected metallic piping.