Site Preparation Guide, Third Edition - HP Integrity cx2600

General Site Preparation Guidelines
Electrical Factors
Chapter 3
24
• Liquidtight with RFI shield grounded (most commonly used under raised floors)
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
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 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/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 may 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).
A ground lug is provided on the chassis rear panel. Refer to “Grounding” on page 14.
Dual Power Source Grounding
When dual power sources are utilized, strong consideration should be given to measure voltage potentials.
The use of dual power might create an electrical potential that can be hazardous to personnel and might
cause performance issues for the equipment.