HP Superdome SX2000 Generic Site Preparation Guide, Fourth Edition - Page 12

Distribution Hardware, Wire Selection, Raceway Systems (Electrical Conduits) (LAHJ) - chassis

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Refer to qualified contractors or consultants for each situation. Distribution Hardware This section describes wire selection and the types of raceways (electrical conduits) used in the distribution system. Wire Selection Use copper conductors instead of aluminum conductors. Aluminum's coefficient of expansion differs significantly from that of other metals used in power hardware. Because of this difference, aluminum conductors can cause connector hardware to work loose, overheat, and fail. Raceway Systems (Electrical Conduits) (LAHJ) Raceways form part of the protective ground path for personnel and equipment. They protect the wiring from accidental damage and also provide a heat sink for the wires. The following types are acceptable: • Electrical metallic tubing (EMT)- thin-wall tubing • Rigid (metal) conduit • Liquidtight with RFI shield grounded (most commonly used under raised floors) • Armored 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 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 server 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. 12 General Site Preparation Guidelines

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Refer to qualified contractors or consultants for each situation.
Distribution Hardware
This section describes wire selection and the types of raceways (electrical conduits) used in the
distribution system.
Wire Selection
Use copper conductors instead of aluminum conductors. Aluminum’s coefficient of expansion
differs significantly from that of other metals used in power hardware. Because of this difference,
aluminum conductors can cause connector hardware to work loose, overheat, and fail.
Raceway Systems (Electrical Conduits) (LAHJ)
Raceways form part of the protective ground path for personnel and equipment. They protect
the wiring from accidental damage and also provide a heat sink for the wires.
The following types are acceptable:
•
Electrical metallic tubing (EMT)— thin-wall tubing
•
Rigid (metal) conduit
•
Liquidtight with RFI shield grounded (most commonly used under raised floors)
•
Armored
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
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 server 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.
12
General Site Preparation Guidelines