
Appendix C
Site Preparation
Grounding Systems
107
NOTE
In some cases power distribution system green (green/yellow) wire ground conductors are too
long and inductive to provide adequate high frequency ground return paths. Therefore, the
server is shipped with a ground strap for connecting the system cabinet to the site grounding
grid (customer-supplied). When connecting this ground, ensure that the raised floor is properly
grounded.
Power panels located in close proximity to the computer equipment should also be connected to the site
grounding grid. Methods of providing a sufficiently high frequency ground grid are described in the next
sections.
Raised Floor Grounding
If a raised floor system is used, install a complete signal grounding grid for maintaining equal potential over
a broad band of frequencies. The grounding grid should be connected to the equipment cabinet and electrical
service entrance ground at multiple connection points using a minimum #6 AWG (16mm2) wire ground
conductor.
Hewlett-Packard recommends the following approaches:
•
Excellent—Add a grounding grid to the subfloor. The grounding grid should be made of aluminum strips
mounted to the subfloor. The strips should be 0.032 in. (0.08 cm) thick and a minimum of 3.0 in. (8.0 cm)
wide.
Connect each pedestal to four strips using 1/4 in. (6.0 mm) bolts tightened to the manufacturer’s torque
recommendation.
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 ...