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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 - 7 <br />1. If concrete foundation is less than 20 feet long, coil excess conductor within base of <br />foundation. <br />2. Bond grounding conductor to reinforcing steel in at least four locations and to anchor <br />bolts. Extend grounding conductor below grade and connect to building grounding grid <br />or to grounding electrode external to concrete. <br />3.5 FIELD QUALITY CONTROL <br />A. Testing Agency: Owner will engage a qualified testing and inspecting agency to perform field <br />tests and inspections and prepare test reports. <br />B. Testing Agency: Engage a qualified testing and inspecting agency to perform the following <br />field tests and inspections and prepare test reports: <br />C. Perform the following tests and inspections and prepare test reports: <br />1. After installing grounding system but before permanent electrical circuits have been <br />energized, test for compliance with requirements. <br />2. Test completed grounding system at each location where a maximum ground-resistance <br />level is specified, at service disconnect enclosure grounding terminal, at ground test <br />wells, and at individual ground rods. Make tests at ground rods before any conductors <br />are connected. <br />a. Measure ground resistance not less than two full days after last trace of <br />precipitation and without soil being moistened by any means other than natural <br />drainage or seepage and without chemical treatment or other artificial means of <br />reducing natural ground resistance. <br />b. Perform tests by fall-of-potential method according to IEEE 81. <br />3. Prepare dimensioned drawings locating each test well, ground rod and ground rod <br />assembly, and other grounding electrodes. Identify each by letter in alphabetical order, <br />and key to the record of tests and observations. Include the number of rods driven and <br />their depth at each location, and include observations of weather and other phenomena <br />that may affect test results. Describe measures taken to improve test results. <br />D. Report measured ground resistances that exceed the following values: <br />1. Power and Lighting Equipment or System with Capacity 500 kVA and Less: 10 ohms. <br />2. Power and Lighting Equipment or System with Capacity 500 to 1000 kVA: 5 ohms. <br />3. Power and Lighting Equipment or System with Capacity More Than 1000 kVA: 3 ohms. <br />4. Power Distribution Units or Panelboards Serving Electronic Equipment: 3 ohms. <br />5. Substations and Pad-Mounted Equipment: 5 ohms. <br />6. Manhole Grounds: 10 ohms. <br />E. Excessive Ground Resistance: If resistance to ground exceeds specified values, notify Architect <br />promptly and include recommendations to reduce ground resistance. <br />END OF SECTION 260526