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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.