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OC Motor Pool and Maintenance Shop <br />PDC Project 23017 Grounding and Bonding for Electrical <br />Systems 26 05 26 - 3 <br />locate in softscape (uncovered)area. <br />6.Provide additional ground electrode(s)as required to achieve specified grounding electrode <br />system resistance. <br />7.Ground Bar: Provide ground bar in main electrical room,separate from service equipment <br />enclosure,for common connection point of grounding electrode system bonding jumpers as <br />permitted in NFPA 70.Connect grounding electrode conductor provided for service-supplied <br />system grounding to this ground bar. <br />a.Ground Bar Size: 1/4"x 2"x 18"unless otherwise indicated or required. <br />b.Where ground bar location is not indicated,locate in accessible location as near as <br />possible to service disconnect enclosure. <br />8.unless otherwise noted.Location as identified on plans. <br />9.Ground Riser: Provide common grounding electrode conductor not less than 3/0 AWG for <br />tap connections to multiple separately derived systems as permitted in NFPA 70. <br />G.Service-Supplied System Grounding: <br />1.For each service disconnect,provide grounding electrode conductor to connect neutral <br />(grounded)service conductor to grounding electrode system.Unless otherwise indicated, <br />make connection at neutral (grounded)bus in service disconnect enclosure. <br />2.For each service disconnect,provide main bonding jumper to connect neutral (grounded)bus <br />to equipment ground bus where not factory-installed.Do not make any other connections <br />between neutral (grounded)conductors and ground on load side of service disconnect. <br />H.Separately Derived System Grounding: <br />1.Separately derived systems include,but are not limited to: <br />a.Transformers. <br />b.Uninterruptible power supplies (UPS),when configured as separately derived systems. <br />c.Generators,when neutral is switched in the transfer switch. <br />2.Provide grounding electrode conductor to connect derived system grounded conductor to <br />nearest effectively grounded metal building frame.Unless otherwise indicated,make <br />connection at neutral (grounded)bus in source enclosure. <br />3.Provide bonding jumper to connect derived system grounded conductor to nearest metal <br />building frame and nearest metal water piping in the area served by the derived system, <br />where not already used as a grounding electrode for the derived system.Make connection at <br />same location as grounding electrode conductor connection. <br />4.Where common grounding electrode conductor ground riser is used for tap connections to <br />multiple separately derived systems,provide bonding jumper to connect the metal building <br />frame and metal water piping in the area served by the derived system to the common <br />grounding electrode conductor. <br />5.Provide system bonding jumper to connect system grounded conductor to equipment ground <br />bus.Make connection at same location as grounding electrode conductor connection.Do not <br />make any other connections between neutral (grounded)conductors and ground on load side <br />of separately derived system disconnect. <br />I.Bonding and Equipment Grounding: <br />1.Provide bonding for equipment grounding conductors,equipment ground busses,metallic <br />equipment enclosures,metallic raceways and boxes,device grounding terminals,and other <br />normally non-current-carrying conductive materials enclosing electrical conductors/equipment <br />or likely to become energized as indicated and in accordance with NFPA 70. <br />2.Provide insulated equipment grounding conductor in each feeder and branch circuit raceway. <br />Do not use raceways as sole equipment grounding conductor. <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 />Docusign Envelope ID: EF9C08D2-5B75-438B-8D6D-8473F81BD7C4