HP 9000 rp3410 Site Preparation Guide, Fifth Edition - HP 9000 rp3410/rp3440 - Page 22
Raceway Systems (Electrical Conduits) (LAHJ), Building Distribution, Grounding Systems, Power
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General Site Preparation Guidelines Electrical Factors Raceway Systems (Electrical Conduits) (LAHJ) Raceways (electrical conduits) form part of the protective ground path for personnel and equipment. Raceways protect the wiring from accidental damage and also provide a heatsink for the wires. Any of the following types may be used: • Electrical metallic tubing (EMT) thin-wall tubing • Rigid (metal) conduit • Liquidtight with RFI shield grounded (most commonly used under raised floors) • Armored cable 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. Grounding Systems IT Power System This product has not been evaluated for connection to an IT power system (an AC distribution system having no direct connection to earth according to IEC 60950). A HP 9000 rp3410 or HP 9000 rp3440 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 and yellow) wire ground conductors. Having these ground connections tied to metal chassis parts that may be touched by computer room personnel 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, so as to provide a continuous grounding system. Power Panel Ground Each power panel should be grounded to the electrical service entrance with green (green and yellow) wire ground conductors. The green (green and yellow) wire ground conductors should be sized per applicable codes (based on circuit over current device ratings). 22 Chapter 2