HP Management LAN Blade for bh7800 Site Preparation Guide, Second Edition - HP - Page 26

General System and Facility Guidelines Grounding Systems Grounding Systems Power Distribution Safety Grounding 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 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. Hewlett-Packard 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 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/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 mentioned above might be a black wire marked with green tape. Computer Safety Ground WARNING When dual power sources are used, always measure voltage potentials. Failure to do so can result in exposure of personnel to electric shock hazard and damage to the equipment. 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). 26 Chapter 2