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Specify Grounding Requirements
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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 via minimum #6 AWG
(16mm2) wire ground conductor. See the raised floor grounding illustration for details.
Hewlett-Packard recommends the following three 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.
• Good—Use the raised floor structure as a ground grid. In this case, the floor must be designed as a ground
grid with bolted down stringers and tin-lead or zinc plating (to provide low resistance and attachment
points for connection to service entrance ground and HP rp7400 server equipment). The use of conductive
floor tiles with this style of grid further enhances ground performance.
• Adequate—If the excellent or good ground grid systems are impossible to implement, contact your
Hewlett-Packard site preparation specialist. Arrangements can be made to provide custom lengths of
ground braid to interconnect system cabinets. However, connecting system cabinets with custom lengths
of braided ground straps causes higher ground impedance than the techniques used in the excellent and
good ground grid systems, and the resulting ground system will not perform as well.
Nonraised floor installations If the computer room does not have a raised floor, use a cable trough
assembly to route equipment power cables.
Ground wire
to power panel
Grounding clamp
Band and pedestal Grounding braid
to computer equipment
Grounding grid element
Hex bolt
Floor panel
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EXSM007