Grounding Systems - HP Rp3440-4 - 9000 - 0 MB RAM Manual

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).
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Chapter 2