HP Integrity rx7620 Site Preparation Guide, Fourth Editon - HP Integrity rx762 - Page 47
Building Distribution, Power Routing, Grounding Systems, Power Distribution Safety Grounding (LAHJ)
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General Site Preparation Guidelines Electrical Factors Building Distribution All building feeders and branch circuitry should be in rigid metallic conduit with proper connectors (to provide ground continuity) Conduit that is exposed and subject to damage should be constructed of rigid galvanized steel. Power Routing Power drops and interface cables from the equipment are routed down from the power panel, through a grommet protected opening (beneath the floor level), and under the floor panels. Grounding Systems The server requires two methods of grounding: • Power distribution safety grounding • High frequency intercabinet grounding Power Distribution Safety Grounding (LAHJ) The power distribution safety grounding system consists of connecting various points in the power distribution system to earth ground using green (green/yellow) wire ground conductors. Having these ground connections tied to metal chassis parts that computer room personnel might touch protects them against shock hazard from current leakage and fault conditions. Power distribution systems consist of several parts. HP recommends that these parts be solidly interconnected to provide an equipotential ground to all points. Main Building Electrical Ground The main electrical service entrance equipment should have an earth ground connection, as required by applicable codes. Connections, such as a grounding rod, building steel, or a conductive type cold water service pipe, provide an earth ground. Electrical Conduit Ground All electrical conduits should be made of rigid metallic conduit that is securely connected together or bonded to panels and electrical boxes to provide a continuous grounding system. Power Panel Ground Each power panel should be grounded to the electrical service entrance with green (green/yellow) wire ground conductors. The green (green/yellow) wire ground conductors should be sized per applicable codes (based on circuit over current device ratings). NOTE The green wire ground conductor can be a black wire marked with green tape. (LAHJ) Computer Safety Ground Ground all computer equipment with the green (green/yellow) wire included in the branch circuitry. The green (green/yellow) wire ground conductors should be connected to the appropriate power panel and should be sized per applicable codes (based on circuit over current device ratings). Appendix B 33
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