SECTION 260526 GROUNDING AND BONDING …

1 SECTION 260526 GROUNDING ANDBONDING 03/03/14 ISSUED FOR BIDS 260526 - 1 GROUNDING ANDBONDING PART 1 - .. PART 2 -PRODUCTS .. GROUNDINGCONDUCTORS .. CONNECTORPRODUCTS .. PART 3 - .. UNDERGROUND DISTRIBUTION FIELD QUALITY GRADING ANDPLANTING ..9 PART 1 - GENERAL DOCUMENTS and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this SECTION . SECTION includes GROUNDING of electrical systems and equipment. GROUNDING requirementsspecified in this SECTION may be supplemented by special requirements of systems described inotherSections. Sections include the following: 26 SECTION "Underground Ducts and Utility Structures" for ground testwells. 26 SECTION electrical General Requirements . 26 SECTION Conductors and Cables . B 3: Specification for Soft or Annealed Copper Wire. B 8: Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hardor Soft.

2 B 33: Specification for Tinned Soft or Annealed Copper Wire for electrical Purposes. B 187: Specification for Copper, Bus Bar, Rod, and Shapes and General Purpose Rod,Bar, and Shapes. SECTION 260526 GROUNDING ANDBONDING 03/03/14 ISSUED FOR BIDS 260526 - 2 81: Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System. 142: GROUNDING of Industrial and Commercial Power Systems. 837: Qualifying Permanent Connections Used in Substation GROUNDING . 1100 1992: Recommended Practice for Powering and GROUNDING Sensitive Electronic Equipment. C2: National electrical Safety Code. MTS 2001: Maintenance Testing 70: National electrical Code. 70B: Recommended Practice for electrical Equipment Maintenance. 607: Commercial Building GROUNDING and BONDING Requirements 467: GROUNDING and BONDING Equipment. 486 A: Wire Connectors and Soldering Lugs for Use with Copper 486B: Wire Connectors for Use with Aluminum Conductors.

3 Data: For each type of product Data: For the following: rods. Data: For firms and persons specified in "Quality Assurance" Test Reports: Submit written test reports to include the following: procedures used. results that comply with requirements. of failed tests and corrective action taken to achieve test results that comply withrequirements. overall system resistance to ground. overall Telecommunications system resistance to ground. RECORD DOCUMENTS under provisions of Division 26 electrical General Requirements . record actual locations of GROUNDING electrodes and connections to building steel. SECTION 260526 GROUNDING ANDBONDING 03/03/14 ISSUED FOR BIDS 260526 - 3 ASSURANCE Agency Qualifications: Refer to specification SECTION electrical Testing. 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 forintended use.

4 With UL 467. with NFPA 70; for overhead-line construction and medium-voltage undergroundconstruction, comply with IEEE C2. with NFPA 780 and UL 96 when interconnecting with lightning with ANSI/TIA/EIA-607 Standard for Commercial Building GROUNDING and BONDING requirements for telecommunications . with ANSI/IEEE 1100 -1992 Powering andGrounding Sensitive Electronic Equipment .PART 2 - PRODUCTS : Subject to compliance with requirements, provide products by one of thefollowing: Conductors and Cables: a. Refer to Division 26 SECTION Conductors and Cables . Rods: a. American GROUNDING /Erico Chance/Hubbell. Connectors: a. American Burndy. c. Chance/Hubbell. Connections: a. Cadweld. CONDUCTORS insulated conductors, comply with Division 26 SECTION "Conductors and Cables." : Copper. GROUNDING Conductors: Insulated with green-colored insulation. SECTION 260526 GROUNDING ANDBONDING 03/03/14 ISSUED FOR BIDS 260526 - 4 Ground Conductors: Insulated with green-colored insulation with yellow stripe.

5 Onfeeders with isolated ground, use colored tape, alternating bands of green and yellow tape toprovide a minimum of three bands of green and two bands of yellow. Electrode Conductors: Stranded cable. Conductors: Bare, stranded, copper unless otherwise Copper Conductors: Comply with the following: Conductors: ASTM B 3. of Stranded Conductors: ASTM B 8. Conductors: ASTM B BONDING Conductors: As follows: Conductor: Stranded copper conductor; size per the NEC. Jumper: Bare copper tape, braided bare copper conductors, terminated withcopper ferrules; size per the NEC. BONDING Jumper: Tinned-copper tape, braided copper conductors, terminated withcopper ferrules; size per the NEC. Bus: Bare, annealed copper bars of rectangular cross SECTION , with Main GROUNDING Busbar (TMGB) (min) x 4 x tin plated, copper busbar with three rows of x 20 tapped holes 3 oncenter. PRODUCTS with IEEE 837 and UL 467; listed for use for specific types, sizes, and combinations ofconductors and connected items.

6 Connectors: Bolted-pressure-type connectors, or compression type. Connectors: Exothermic-welded type, in kit form, and selected for the specificapplication per manufacturer's written instructions. Connectors: Pure, wrought copper, per ASTM B187. ELECTRODES Rods: Copper-clad steel. : 3/4 in diameter. : 120 inches. SECTION 260526 GROUNDING ANDBONDING 03/03/14 ISSUED FOR BIDS 260526 - 5 PART 3 - EXECUTION GROUNDING with NFPA 70, Article 250, for types, sizes, and quantities of equipment groundingconductors, unless specific types, larger sizes, or more conductors than required by NFPA 70are indicated. only copper conductors for both insulated and bare GROUNDING conductors in direct contactwith earth,concrete, masonry, crushed stone, and similar materials. GROUNDING Conductors: No. 2/0 AWG minimum. Bury at least 24 inches belowgrade or bury 12 inches above duct bank when installed as part of the duct bank. raceways, use insulated equipment GROUNDING conductors.

7 Equipment GROUNDING conductors in all feeders and circuits. Terminate each end onsuitable lugs, bus or bushing. Supply Circuits: Install insulated equipment GROUNDING conductor from thegroundingbusin the switchgear, switchboard, or distribution panel to equipment GROUNDING bar terminal onbusway. Raceways: Install an equipment GROUNDING conductor in nonmetallic racewaysunless they are designated for telephone or data cables. specific equipment GROUNDING requirements with the manufacturer s recommendations. : Make connections so galvanic action or electrolysis possibility is minimized. Selectconnectors, connection hardware, conductors, and connection methods so metals in directcontact will be galvanically compatible. electroplated or hot-tin-coated materials to ensure high conductivity and to makecontact points closer to order of galvanic series. connections with clean, bare metal at points of contact. aluminum-to-steel connections with stainless-steel separators and mechanicalclamps.

8 Aluminum-to-galvanized steel connections with tin-plated copper jumpers andmechanical clamps. and seal connections having dissimilar metals with inert material to prevent futurepenetration of moisture to contact surfaces. Connections: Use for connections to structural steel and for undergroundconnections, except those at test wells. Comply with manufacturer's written instructions. Weldsthat are puffed up or that show convex surfaces indicating improper cleaning are notacceptable. GROUNDING Conductor Terminations SECTION 260526 GROUNDING ANDBONDING 03/03/14 ISSUED FOR BIDS 260526 - 6 solderless pressure connectors with insulating covers for copper conductor splicesand taps, 8 AWG and larger. insulated spring wire connectors with plastic caps for copper conductor splices andtaps, 10 AWG and smaller. Metal Raceway Terminations: If metallicraceways terminate at metal housingswithout mechanical and electrical connection to housing, terminate each conduit with agrounding bushing.

9 Connect GROUNDING bushings with a bare GROUNDING conductor to groundingbus or terminal in housing. Bond electrically noncontinuous conduits at entrances and exits withgrounding bushings and bare GROUNDING conductors, unless otherwise indicated. screws and bolts for GROUNDING and BONDING connectors and terminals according tomanufacturer's published torque-tightening values. If manufacturer's torque values are notindicated, use those specified in UL 486A. Connections: Use hydraulic compression tools to provide correctcircumferential pressure for compression connectors. Use tools and dies recommended byconnector manufacturer. Provide embossing die code or other standard method to make avisible indication that a connector has been adequately compressed on GROUNDING conductor. Protection: If insulated GROUNDING conductors are connected to ground rods orgrounding buses, insulate entire area of connection and seal against moisture penetration ofinsulation and cable.

10 Ground: Interconnect GROUNDING electrodes to form one, electrically continuous,equipotential GROUNDING electrode system GROUNDING electrodes to be interconnected include: rods. Rods: Install at least three rods spaced at least one-rod length from each other andlocated at least the same distance from other GROUNDING electrodes. that final backfill and compaction has been complete before driving ground rods. ground rods until tops are 2 inches below finished floor or final grade, unlessotherwise indicated. ground rods with GROUNDING electrode conductors. Use exothermic welds,except at test wells and as otherwise indicated. Make connections without exposing steelor damaging copper coating. Conductors: Route along shortest and straightest paths possible, unless otherwiseindicated. Avoid obstructing access or placing conductors where they may be subjected tostrain, impact, or damage. Install in conduit where routed above grade. Straps and Jumpers: Install so vibration by equipment mounted on vibration isolationhangers and supports is not transmitted to rigidly mounted equipment.