
Appendix C
Site Preparation
Grounding Systems
106
Grounding Systems
hp rp7405/rp7410 servers require two methods of grounding:
•
Power distribution safety grounding
•
High frequency intercabinet grounding
Power Distribution Safety Grounding
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. Hewlett-Packard 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.
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).
Cabinet Performance Grounding (High frequency Ground)
Signal interconnects between system cabinets require high frequency ground return paths. Connect all
cabinets to site ground.
Summary of Contents for rp7405
Page 6: ...Contents vi ...
Page 8: ...Tables viii ...
Page 11: ...Preface ...
Page 15: ...xi Figure 1 Declaration of Conformity ...
Page 22: ...xviii ...
Page 39: ...Chapter 2 17 2 Installation ...
Page 70: ...Chapter 2 Installation Booting HP UX using Boot Console Handler BCH 48 ...
Page 71: ...Chapter 3 49 3 Troubleshooting ...
Page 78: ...Chapter 3 Troubleshooting Common Installation Problems 56 ...
Page 79: ...Chapter 4 57 4 Removal and Replacement ...
Page 111: ...Appendix A 89 A Replaceable Parts ...
Page 122: ...Appendix B System Specifications Environmental Specifications 100 ...
Page 123: ...Appendix C 101 C Site Preparation ...