HP 9000 Superdome SX2000 Generic Site Preparation Guide - Edition 6 - Page 13

Building Distribution, Grounding Systems, Power Distribution Safety Grounding (LAHJ)

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Building Distribution Place building feeders and branch circuitry in rigid metallic conduits with proper connectors (to provide ground continuity). Ensure that all conduits that are exposed and subject to damage are constructed of rigid galvanized steel. Grounding Systems HP systems are tested and certified only with grounding systems in which a neutral return path and a protective earth are separate conductors without any inserted impedances. Additionally, protective earth and return neutral are shorted together at the X0 bonding junction on the secondary side of the newly derived power source. IT Power System HP products have 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 product requires two methods of grounding: • Power distribution safety • High-frequency intercabinet Power Distribution Safety Grounding (LAHJ) The power distribution safety grounding system connects various points in the power distribution system to earth ground using green (green/yellow) wire ground conductors. To protect computer room personnel against shock hazards from current leakage and fault conditions, tie the ground connections to metal chassis parts. Power distribution systems consist of several parts that should be solidly interconnected to provide an equipotential ground to all points. Main Building Electrical Ground The main electrical service entrance equipment must have an earth ground connection as required by applicable codes. Such connections as a grounding rod or building steel provide an earth ground. Electrical Conduit Ground All electrical conduits must 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 Ground each power panel to the electrical service entrance with green (green/yellow) wire ground conductors. Size the green (green/yellow) wire ground conductors per applicable codes (based on circuit-over-current device ratings). The PE (Protective Earth) wire gauge may be a larger diameter wire but not a smaller diameter wire than the AC input power distribution wire. NOTE: The green wire ground conductor mentioned above can be a black wire with green tape. (LAHJ) Computer Safety Ground Ground all computer equipment with the green (green/yellow) wire included in the branch circuitry. Connect the green (green/yellow) wire ground conductors to the appropriate power panel and size them per applicable codes (based on circuit-over-current device ratings). Electrical Factors 13

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Building Distribution
Place building feeders and branch circuitry in rigid metallic conduits with proper connectors (to
provide ground continuity). Ensure that all conduits that are exposed and subject to damage are
constructed of rigid galvanized steel.
Grounding Systems
HP systems are tested and certified only with grounding systems in which a neutral return path
and a protective earth are separate conductors without any inserted impedances. Additionally,
protective earth and return neutral are shorted together at the X0 bonding junction on the
secondary side of the newly derived power source.
IT Power System
HP products have 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 product requires two methods of grounding:
•
Power distribution safety
•
High-frequency intercabinet
Power Distribution Safety Grounding (LAHJ)
The power distribution safety grounding system connects various points in the power distribution
system to earth ground using green (green/yellow) wire ground conductors. To protect computer
room personnel against shock hazards from current leakage and fault conditions, tie the ground
connections to metal chassis parts.
Power distribution systems consist of several parts that should be solidly interconnected to
provide an equipotential ground to all points.
Main Building Electrical Ground
The main electrical service entrance equipment must have an earth ground connection as required
by applicable codes. Such connections as a grounding rod or building steel provide an earth
ground.
Electrical Conduit Ground
All electrical conduits must 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
Ground each power panel to the electrical service entrance with green (green/yellow) wire ground
conductors. Size the green (green/yellow) wire ground conductors per applicable codes (based
on circuit-over-current device ratings). The PE (Protective Earth) wire gauge may be a larger
diameter wire but not a smaller diameter wire than the AC input power distribution wire.
NOTE:
The green wire ground conductor mentioned above can be a black wire with green
tape. (LAHJ)
Computer Safety Ground
Ground all computer equipment with the green (green/yellow) wire included in the branch
circuitry. Connect the green (green/yellow) wire ground conductors to the appropriate power
panel and size them per applicable codes (based on circuit-over-current device ratings).
Electrical Factors
13