Site Preparation Guide, Fourth Editon - HP Integrity rx7620 Server

Appendix B
General Site Preparation Guidelines
Electrical Factors
33
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).