Attachment 1: Specifications - Metropolitan Washington Airports ...

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DCA TERMINAL A IMPROVEMENTS (NEAR TERM) 10 AUGUST 2012 TASK ORDER 03: LOBBY IMPROVEMENTS – PKG 4 - CURBSIDE CHECK-IN RONALD REAGAN WASHINGTON NATIONAL AIRPORT PROJECT DT1203 1. Interconnect ground rods with grounding electrode conductor below grade and as otherwise indicated. Make connections without exposing steel or damaging coating if any. D. Bonding Straps and Jumpers: Install in locations accessible for inspection and maintenance except where routed through short lengths of conduit. 1. Bonding to Structure: Bond straps directly to basic structure, taking care not to penetrate any adjacent parts. 2. Bonding to Equipment Mounted on Vibration Isolation Hangers and Supports: Install bonding so vibration is not transmitted to rigidly mounted equipment. 3. Use exothermic-welded connectors for outdoor locations; if a disconnect-type connection is required, use a bolted clamp. E. Grounding and Bonding for Piping: 1. Bond each aboveground portion of gas piping system downstream from equipment shutoff valve. F. Bonding Interior Metal Ducts: Bond metal air ducts to equipment grounding conductors of associated fans, blowers, electric heaters, and air cleaners. Install bonding jumper to bond across flexible duct connections to achieve continuity. G. Grounding for Steel Building Structure: Install a driven ground rod at base of each corner column and at intermediate exterior columns at distances not more than 60 feet apart. PART 4 - CONTRACTOR’S QUALITY CONTROL REQUIREMENTS 4.1 FIELD QUALITY CONTROL A. Comply with applicable provisions of Division 01 Section “Quality Requirements” for requirements for Contractor Quality Control Program. B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use. C. Field Quality Control: 1. Testing Agency: An independent agency, with the experience and capability to conduct the testing indicated, that is a member company of the InterNational Electrical Testing Association (NETA) or is a nationally recognized testing laboratory (NRTL) as defined by OSHA in 29 CFR 1910.7, and that is acceptable to authorities having jurisdiction. a. Testing Agency's Field Supervisor: Person currently certified by the InterNational Electrical Testing Association to supervise on-site testing specified in Part 3. GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 26 05 26 - 4
DCA TERMINAL A IMPROVEMENTS (NEAR TERM) 10 AUGUST 2012 TASK ORDER 03: LOBBY IMPROVEMENTS – PKG 4 - CURBSIDE CHECK-IN RONALD REAGAN WASHINGTON NATIONAL AIRPORT PROJECT DT1203 2. Perform the following tests and inspections and prepare test reports: a. After installing grounding system but before permanent electrical circuits have been energized, test for compliance with requirements. b. Test completed grounding system at each location where a maximum groundresistance level is specified, at service disconnect enclosure grounding terminal. Make tests at ground rods before any conductors are connected. 1) Measure ground resistance not less than two full days after last trace of precipitation and without soil being moistened by any means other than natural drainage or seepage and without chemical treatment or other artificial means of reducing natural ground resistance. 2) Perform tests by fall-of-potential method according to IEEE 81. c. Prepare dimensioned drawings locating each test well, ground rod and ground rod assembly, and other grounding electrodes. Identify each by letter in alphabetical order, and key to the record of tests and observations. Include the number of rods driven and their depth at each location, and include observations of weather and other phenomena that may affect test results. Describe measures taken to improve test results. 3. Report measured ground resistances that exceed the following values: a. Power and Lighting Equipment or System with Capacity 500 kVA and Less: 10 ohms. b. Power and Lighting Equipment or System with Capacity 500 to 1000 kVA: 5 ohms. c. Power and Lighting Equipment or System with Capacity More Than 1000 kVA: 3 ohms. d. Power Distribution Units or Panelboards Serving Electronic Equipment: 3 ohm(s). 4. Excessive Ground Resistance: If resistance to ground exceeds specified values, notify COTR promptly and include recommendations to reduce ground resistance. 5. Comply with UL 467 for grounding and bonding materials and equipment. END OF SECTION 26 05 26 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 26 05 26 - 5
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TECHNICAL SPECIFICATIONS VOLUME I O
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