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OC Motor Pool and Maintenance Shop <br />PDC Project 23017 Grounding and Bonding for Electrical <br />Systems 26 05 26 - 4 <br />6.Provide bonding jumper across expansion or expansion/deflection fittings provided to <br />accommodate conduit movement. <br />7.Provide bonding for interior metal piping systems in accordance with NFPA 70.This includes, <br />but is not limited to: <br />a.Metal water piping where not already effectively bonded to metal underground water <br />pipe used as grounding electrode. <br />b.Metal gas piping. <br />c.Metal process piping. <br />2.02 GROUNDING AND BONDING COMPONENTS <br />A.General Requirements: <br />1.Provide products listed,classified,and labeled as suitable for the purpose intended. <br />2.Provide products listed and labeled as complying with UL 467 where applicable. <br />B.Conductors for Grounding and Bonding,in Addition to Requirements of Section 26 05 26: <br />1.Use insulated copper conductors unless otherwise indicated. <br />a.Exceptions: <br />1)Use bare copper conductors where installed underground in direct contact with <br />earth. <br />2)Use bare copper conductors where directly encased in concrete (not in raceway). <br />2.Where insulated grounding conductors are used conductors shall be colored solid green. <br />3.Grounding electrode conductors #4 AWG and larger shall be installed in raceway. <br />C.Connectors for Grounding and Bonding: <br />1.Description: Connectors appropriate for the application and suitable for the conductors and <br />items to be connected;listed and labeled as complying with UL 467. <br />2.Unless otherwise indicated,use exothermic welded connections for underground,concealed <br />and other inaccessible connections. <br />3.Unless otherwise indicated,use double crimp compression connectors or exothermic welded <br />connections for accessible connections. <br />D.Ground Bars: <br />1.Description: Copper rectangular ground bars with mounting brackets and insulators. <br />2.Size: As indicated elsewhere in this section. <br />3.Holes for Connections: All mechanical connectors shall be double hole double crimp <br />compression connectors.. <br />E.Ground Rod Electrodes: <br />1.Comply with NEMA GR 1. <br />2.Material: Copper-bonded (copper-clad)steel. <br />3.Size: 3/4 inch diameter by 10 feet length,unless otherwise indicated. <br />PART 3 EXECUTION <br />3.01 EXAMINATION <br />A.Verify that work likely to damage grounding and bonding system components has been completed. <br />B.Verify that field measurements are as indicated. <br />C.Verify that conditions are satisfactory for installation prior to starting work. <br />3.02 INSTALLATION <br />A.Install products in accordance with manufacturer's instructions. <br />B.Install grounding and bonding system components in a neat and workmanlike manner. <br />C.Boxes with concentric,eccentric or oversized knockouts shall be provided with bonding bushings <br />and jumpers.The jumper shall be sized per NEC table 250-122 and lugged to the box. <br />D.Ground Rod Electrodes: Unless otherwise indicated,install ground rod electrodes vertically. <br />Where encountered rock prohibits vertical installation,install at 45 degree angle. <br />Docusign Envelope ID: EF9C08D2-5B75-438B-8D6D-8473F81BD7C4