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Construction Documents <br />20052.02 / Orange County - Justice <br />Facility <br />26 0526 - 4 GROUNDING AND BONDING FOR <br />ELECTRICAL SYSTEMS <br />3. Where circuit conductor sizes are increased for voltage drop, increase size of equipment <br />grounding conductor proportionally in accordance with NFPA 70. <br />4. Unless otherwise indicated, connect wiring device grounding terminal to branch circuit <br />equipment grounding conductor and to outlet box with bonding jumper. <br />5. Terminate branch circuit equipment grounding conductors on solidly bonded equipment <br />ground bus only. Do not terminate on neutral (grounded) or isolated/insulated ground bus. <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 <br />includes, 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 />J.Communications Systems Grounding and Bonding: <br />1.Provide intersystem bonding termination at service equipment or metering equipment <br />enclosure and at disconnecting means for any additional buildings or structures in <br />accordance with NFPA 70. <br />2.Provide bonding jumper in raceway from intersystem bonding termination to each <br />communications room or backboard and provide ground bar for termination. <br />a.Bonding Jumper Size: #3/0 AWG. <br />b.Raceway Size: 1" trade size unless otherwise indicated or required. <br />c.Ground Bar Size: 1/4" x 2" x 18" unless otherwise indicated or required. <br />d.Ground Bar Mounting Height: 18 inches (450 mm) above finished floor unless <br />otherwise indicated. <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 0526: <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 <br />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 <br />and items to be connected; listed and labeled as complying with UL 467. <br />2.Unless otherwise indicated, use exothermic welded connections for underground, <br />concealed and other inaccessible connections. <br />3.Unless otherwise indicated, use double crimp compression connectors or exothermic <br />welded 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 />DocuSign Envelope ID: 09980A3B-0691-41B4-854D-3865F2287392