ࡱ> ruqg UbjbjJJ ;~(ub(ubL (((8`TT(q;.     !!!:::::::$<U?T;!!!"!!;  +;t5t5t5!R  :t5!:t5t57x8 7"^T8:A;0q;p8@v"j @x8x88@8,!!t5!!!!!;;+ !!!q;!!!!@!!!!!!!!!B : SECTION 260526 - GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS Latest Update: 5.6.2017 See Underlined Text. (Engineer shall edit specifications and blue text in header to meet project requirements. This includes but is not limited to updating Equipment and/or Material Model Numbers indicated in the specifications and adding any additional specifications that may be required by the project. Also turn off all Underlines.) Last Update: 6.9.11. Reformatted and See Underlined Text. GENERAL RELATED DOCUMENTS Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division01 Specification Sections, apply to this section and all other sections of Division 26. SUMMARY Section includes grounding systems and equipment, plus the following special applications: Retain one or more subparagraphs below for special grounding applications. Underground distribution grounding. Ground bonding common with lightning protection system. SUBMITTALS Product Data: For each type of product indicated. Informational Submittals: Plans showing dimensioned as-built locations of grounding features specified in "Field Quality Control" Article, including the following: Test wells. Ground rods. Ground rings. Grounding arrangements and connections for separately derived systems. Grounding for sensitive electronic equipment, i.e., computer and office equipment. Grounding for UPS, batteries and related equipment. Grounding for Generators, transfer switches and related equipment. Grounding for HVAC, pumps and related equipment. Grounding for Lightning Protection System. Qualification Data: For qualified testing agency and testing agency's field supervisor. Field quality-control reports. Operation and Maintenance Data: For grounding to include in emergency, operation, and maintenance manuals. In addition to items specified in Division01 Section "Operation and Maintenance Data," include the following: Instructions for periodic testing and inspection of grounding features at test wells, ground rings, grounding connections for separately derived systems, shall be based on NFPA70B. Tests shall determine if ground-resistance or impedance values remain within specified maximums, and instructions shall recommend corrective action if values do not. Include recommended testing intervals. QUALITY ASSURANCE Independent Testing Agency Qualifications: Member Company of NETA or an NRTL. Testing Agency's Field Supervisor: Currently certified by NETA to supervise on-site testing. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA70, by a qualified testing agency, and marked for intended location and application. Comply with UL467 for grounding and bonding materials and equipment. WARRANTY/GUARANTEE See Division 26 Specification Section Basic Electrical Requirements for warranty and guarantee requirements. PRODUCTS CONDUCTORS Insulated Conductors: Copper or Tinned-copper wire or cable insulated for 600V unless otherwise required by applicable Code or authorities having jurisdiction. Bare Copper Conductors: Solid Conductors: ASTMB3. Stranded Conductors: ASTMB8. Tinned Conductors: ASTMB33. Bonding Conductor: No.4 or No.6AWG, stranded conductor. Bonding Jumper: Copper tape, braided conductors terminated with copper ferrules; one and five eights (1-5/8) inches wide and one sixteenth (1/16) inch thick. Tinned Bonding Jumper: Tinned-copper tape, braided conductors terminated with copper ferrules; one and five eights (1-5/8) inches wide and one sixteenth (1/16) inch thick. Retain paragraph below if size of grounding bus and mounting details are not indicated on Drawings. Grounding Bus: Predrilled rectangular bars of annealed copper, one quarter (1/4) by four (4) inches in cross section, with nine thirty seconds (9/32) inch holes spaced one and one eighth (1-1/8) inches apart. Stand-off insulators for mounting shall comply with UL891 for use in switchboards, 600V. Lexan or PVC, impulse tested at 5000V. CONNECTORS Listed and labeled by an NRTL acceptable to authorities having jurisdiction for applications in which used and for specific types, sizes, and combinations of conductors and other items connected. Bolted Connectors for Conductors and Pipes: Copper or copper alloy, pressure type with at least two bolts. Pipe Connectors: Clamp type, sized for pipe. Welded Connectors: Exothermic-welding kits of types recommended by kit manufacturer for materials being joined and installation conditions. Bus-bar Connectors: Mechanical type, cast silicon bronze, solderless compression -type wire terminals, and long-barrel, two-bolt connection to ground bus bar. GROUNDING ELECTRODES Ground Rods: Copper-clad steel; three quarter (3/4) inch in diameter by ten (10) feet long. EXECUTION APPLICATIONS Equipment Grounding Conductors: Install solid conductor for No.8AWG and smaller, and stranded conductors for No.6AWG and larger unless otherwise indicated. Coordinate first paragraph below with Drawings and with Division26 Section "Underground Ducts and Raceways for Electrical Systems." Grounding Electrode Conductors: Install bare tinned copper conductor, No.2/0AWG minimum. Isolated Grounding Conductors: Green-colored insulation with continuous yellow stripe. On feeders with isolated ground, identify grounding conductor where visible to normal inspection, with alternating bands of green and yellow tape, with at least three bands of green and two bands of yellow. Retain first paragraph below if grounding bus is required. Grounding Bus: Install in electrical and telephone equipment rooms, in rooms housing service equipment, and elsewhere as indicated. Install bus on insulated spacers two (2) inches minimum from wall, six (6) inches above finished floor unless otherwise indicated. Where indicated on both sides of doorways, route bus up to top of door frame, across top of doorway, and down to specified height above floor; connect to horizontal bus. Retain paragraph below when new buildings and structures are being installed. Ground Ring: Install a ground ring around the perimeter of the building or structure. Bond the ring in accordance with the National Electrical Code. Retain paragraph below when new buildings and structures are being installed. Concrete Encase Electrode: Install a concrete encased electrode as part of the buildings or structures foundation. Bond the electrode in accordance with the National Electrical Code. Conductor Terminations and Connections: Pipe and Equipment Grounding Conductor Terminations: Bolted connectors. Underground Connections: Welded connectors except at test wells and as otherwise indicated. Connections to Ground Rods at Test Wells: Bolted connectors. Connections to Structural Steel: Welded connectors. GROUNDING UNDERGROUND DISTRIBUTION SYSTEM COMPONENTS Comply with IEEEC2 grounding requirements. Grounding Manholes and Handholes: Install a driven ground rod through manhole or handhole floor, close to wall, and set rod depth so four (4) inches will extend above finished floor. If necessary, install ground rod before manhole is placed and provide No.1/0AWG bare, tinned-copper conductor from ground rod into manhole through a waterproof sleeve in manhole wall. Protect ground rods passing through concrete floor with a double wrapping of pressure-sensitive insulating tape or heat-shrunk insulating sleeve from two (2) inches above to six (6) inches below concrete. Seal floor opening with waterproof, nonshrink grout. Grounding Connections to Manhole Components: Bond exposed-metal parts such as inserts, cable racks, pulling irons, ladders, and cable shields within each manhole or handhole, to ground rod or grounding conductor. Make connections with No.4AWG minimum, stranded, hard-drawn copper bonding conductor. Train conductors level or plumb around corners and fasten to manhole walls. Connect to cable armor and cable shields according to written instructions by manufacturer of splicing and termination kits. Pad-Mounted Transformers and Switches: Install two ground rods and ground ring around the pad. Ground pad-mounted equipment and noncurrent-carrying metal items associated with substations by connecting them to underground cable and grounding electrodes. Install tinned-copper conductor not less than No.2AWG for ground ring and for taps to equipment grounding terminals. Bury ground ring not less than six (6) inches from the foundation. EQUIPMENT GROUNDING Install insulated equipment grounding conductors with the following items, in addition to those required by NFPA70: Feeders and branch circuits. Lighting circuits. Receptacle circuits. Single-phase motor and appliance branch circuits. Three-phase motor and appliance branch circuits. Flexible raceway runs. Armored and metal-clad cable runs. Busway Supply Circuits: Install insulated equipment grounding conductor from grounding bus in the switchgear, switchboard, or distribution panel to equipment grounding bar terminal on busway. Computer and Rack-Mounted Electronic Equipment Circuits: Install insulated equipment grounding conductor in branch-circuit runs from equipment-area power panels and power-distribution units. X-Ray Equipment Circuits: Install insulated equipment grounding conductor in circuits supplying x-ray equipment. Air-Duct Equipment Circuits: Install insulated equipment grounding conductor to duct-mounted electrical devices operating at 120V and more, including air cleaners, heaters, dampers, humidifiers, and other duct electrical equipment. Bond conductor to each unit and to air duct and connected metallic piping. Water Heater, Heat-Tracing, and Antifrost Heating Cables: Install a separate insulated equipment grounding conductor to each electric water heater and heat-tracing cable. Bond conductor to heater units, piping, connected equipment, and components. Ground fault protection is required on heat tracing and anti-frost heating circuits. Isolated Grounding Receptacle Circuits: Install an insulated equipment grounding conductor connected to the receptacle grounding terminal. Isolate conductor from raceway and from panelboard grounding terminals. Terminate at equipment grounding conductor terminal of the applicable derived system or service unless otherwise indicated. Isolated Equipment Enclosure Circuits: For designated equipment supplied by a branch circuit or feeder, isolate equipment enclosure from supply circuit raceway with a nonmetallic raceway fitting listed for the purpose. Install fitting where raceway enters enclosure, and install a separate insulated equipment grounding conductor. Isolate conductor from raceway and from panelboard grounding terminals. Terminate at equipment grounding conductor terminal of the applicable derived system or service unless otherwise indicated. Coordinate first paragraph below with Drawings and with Sections for signal and communication equipment. Revise to suit Project. Signal and Communication Equipment: In addition to grounding and bonding required by NFPA70, provide a separate grounding system complying with requirements in TIA/ATIS J-STD-607-A. For telephone, alarm, voice and data, and other communication equipment, provide No.4AWG minimum insulated grounding conductor in raceway from grounding electrode system to each service location, terminal cabinet, wiring closet, and central equipment location. Service and Central Equipment Locations and Wiring Closets: Terminate grounding conductor on a one quarter (1/4) inch by four (4) inch by twelve (12) inch grounding bus. Terminal Cabinets: Terminate grounding conductor on cabinet grounding terminal. Metal and Wood Poles Supporting Outdoor Lighting Fixtures: Install grounding electrode, grounding electrode conductor and a separate insulated equipment grounding conductor installed with branch-circuit conductors. INSTALLATION Grounding Electrode and Equipment Grounding Conductors: Route along shortest and straightest paths possible unless otherwise indicated or required by Code. Avoid obstructing access or placing conductors where they may be subjected to strain, impact, or damage. Ground Bonding Common with Lightning Protection System: Comply with NFPA780 and UL96 when interconnecting with lightning protection system. Bond electrical power system ground directly to lightning protection system grounding conductor at closest point to electrical service grounding electrode. Use bonding conductor sized same as system grounding electrode conductor, and install in conduit. Ground Rods: Drive rods until tops are two (2) inches below finished floor or final grade unless otherwise indicated. Interconnect ground rods with grounding electrode conductor below grade and as otherwise indicated. Make connections without exposing steel or damaging coating if any. Retain subparagraph below if grounding installation requirements are not detailed on Drawings. For grounding electrode system, install at least three rods spaced at least one-rod length from each other and located at least the same distance from other grounding electrodes, and connect to the service grounding electrode conductor. Retain first paragraph below to require test wells; delete if detailed on Drawings. Test Wells: Ground rod driven through drilled hole in bottom of handhole. Handholes are specified in Division26 Section "Underground Ducts and Raceways for Electrical Systems," and shall be at least twelve (12) inches deep, with cover. Test Wells: Install at least one (1) test well for each service unless otherwise indicated. Install at the ground rod electrically closest to service entrance. Set top of test well flush with finished grade or floor. Bonding Straps and Jumpers: Install in locations accessible for inspection and maintenance except where routed through short lengths of conduit. Bonding to Structure: Bond straps directly to basic structure, taking care not to penetrate any adjacent parts. Bonding to Equipment Mounted on Vibration Isolation Hangers and Supports: Install bonding so vibration is not transmitted to rigidly mounted equipment. Use exothermic-welded connectors for outdoor locations; if a disconnect-type connection is required, use a bolted clamp. If connections specified in first paragraph below circumvent dielectric fittings intended to isolate interior piping systems from ground, other action may be necessary to prevent electrolytic corrosion. Grounding and Bonding for Piping: Metal Water Service Pipe: Install insulated copper grounding conductors, in conduit, from building's main service equipment, or grounding bus, to main metal water service entrances to building. Connect grounding conductors to main metal water service pipes; use a bolted clamp connector or bolt a lug-type connector to a pipe flange by using one of the lug bolts of the flange. Where a dielectric main water fitting is installed, connect grounding conductor on street side of fitting. Bond metal grounding conductor conduit or sleeve to conductor at each end. Water Meter Piping: Use braided-type bonding jumpers to electrically bypass water meters. Connect to pipe with a bolted connector. Bond each aboveground portion of gas piping system downstream from equipment shutoff valve. Bonding Interior Metal Ducts: Bond metal air ducts to equipment grounding conductors of associated fans, blowers, electric heaters, and air cleaners. Install tinnedbonding jumper to bond across flexible duct connections to achieve continuity. 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 sixty (60) feet apart. Ground Ring: Install a grounding conductor, electrically connected to each building structure ground rod and to each steel column, extending around the perimeter of building. Install tinned-copper conductor not less than No.2/0AWG for ground ring and for taps to building steel. Bury ground ring not less than thirty (30) inches from building's foundation. Retain paragraph below to require Ufer ground (concrete-encased grounding electrode). 20 feet is minimum length of conductor for this item. Ufer Ground (Concrete-Encased Grounding Electrode): Fabricate according to NFPA70; use a minimum of twenty (20) feet of bare copper conductor not smaller than No.4AWG. If concrete foundation is less than twenty (20) feet long, coil excess conductor within base of foundation. Bond grounding conductor to reinforcing steel in at least four locations and to anchor bolts. Extend grounding conductor below grade and connect to building's grounding grid or to grounding electrode external to concrete. LABELING Comply with requirements in Division26 Section "Identification for Electrical Systems" Article for instruction signs. The label or its text shall be green. Install labels at the telecommunications bonding conductor and grounding equalizerand at the grounding electrode conductor where exposed. Label Text: "If this connector or cable is loose or if it must be removed for any reason, notify the facility manager." FIELD QUALITY CONTROL Testing Agency: UMB Engage a qualified independent testing agency to perform tests and inspections. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect components, assemblies, and equipment installations, including connections, and to assist in testing. Tests and Inspections: After installing grounding system but before permanent electrical circuits have been energized, test for compliance with requirements. Inspect physical and mechanical condition. Verify tightness of accessible, bolted, electrical connections with a calibrated torque wrench according to manufacturer's written instructions. Test completed grounding system at each location where a maximum ground-resistance level is specified, at service disconnect enclosure grounding terminal,at ground test wells. Make tests at ground rods before any conductors are connected. Measure ground resistance no fewer than two (2) 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. Perform tests by fall-of-potential method according to IEEE81. 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. Grounding system will be considered defective if it does not pass tests and inspections. Prepare test and inspection reports. Report measured ground resistances that exceed the following values: Power and Lighting Equipment or System with Capacity of 500kVA and less: 10 ohms. Power and Lighting Equipment or System with Capacity of 500 to 1000kVA: 5 ohms. Power and Lighting Equipment or System with Capacity More Than 1000kVA: 3 ohms. Power Distribution Units or Panelboards Serving Electronic Equipment: 1 ohm(s). Substations and Pad-Mounted Equipment: 5 ohms. Manhole Grounds: 10 ohms. Maximum ground-resistance value 5 ohms. Excessive Ground Resistance: If resistance to ground exceeds specified values, notify UMB promptly and include recommendations to reduce ground resistance. 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