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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 - 6 <br />D. Test Wells: Ground rod driven through drilled hole in bottom of handhole. Handholes are <br />specified in Division 26 Section "Underground Ducts and Raceways for Electrical Systems," <br />and shall be at least 12 inches deep, with cover. <br />1. Test Wells: Install at least one test well for each service, unless otherwise indicated. <br />Install at the ground rod electrically closest to service entrance. Set top of test well flush <br />with finished grade or floor. <br />E. Bonding Straps and Jumpers: Install in locations accessible for inspection and maintenance, <br />except where routed through short lengths of conduit. <br />1. Bonding to Structure: Bond straps directly to basic structure, taking care not to penetrate <br />any adjacent parts. <br />2. Bonding to Equipment Mounted on Vibration Isolation Hangers and Supports: Install so <br />vibration is not transmitted to rigidly mounted equipment. <br />3. Use exothermic-welded connectors for outdoor locations, but if a disconnect-type <br />connection is required, use a bolted clamp. <br />F. Grounding and Bonding for Piping: <br />1. Metal Water Service Pipe: Install insulated copper grounding conductors, in conduit, <br />from building's main service equipment, or grounding bus, to main metal water service <br />entrances to building. Connect grounding conductors to main metal water service pipes, <br />using a bolted clamp connector or by bolting a lug-type connector to a pipe flange, using <br />one of the lug bolts of the flange. Where a dielectric main water fitting is installed, <br />connect grounding conductor on street side of fitting. Bond metal grounding conductor <br />conduit or sleeve to conductor at each end. <br />2. Water Meter Piping: Use braided-type bonding jumpers to electrically bypass water <br />meters. Connect to pipe with a bolted connector. <br />3. Bond each aboveground portion of gas piping system downstream from equipment <br />shutoff valve. <br />G. Bonding Interior Metal Ducts: Bond metal air ducts to equipment grounding conductors of <br />associated fans, blowers, electric heaters, and air cleaners. Install bonding jumper to bond <br />across flexible duct connections to achieve continuity. <br />H. Grounding for Steel Building Structure: Install a driven ground rod at base of each corner <br />column and at intermediate exterior columns at distances not more than 60 feet apart. <br />I. Ground Ring: Install a grounding conductor, electrically connected to each building structure <br />ground rod and to each steel column and where indicated on the drawings. <br />1. Install tinned-copper conductor not less than No. 4/0 AWG for ground ring and for taps <br />to building steel. <br />2. Bury ground ring (where indicated) not less than 24 inches from building foundation. <br />J. UFER Ground (Concrete-Encased Grounding Electrode): Fabricate according to CEC, using a <br />minimum of 40 feet (12 meters) of bare copper conductor not smaller than No. 4/0 AWG.