Chapter 5
Site Preparation
Electrical and Environmental Guidelines
136
Best Practices
• Use a 2ft by 2ft grid.
• Flat braid is preferred over round wire.
• Exothermic welds are preferred over mechanical connections.
• All transformers mounted on the floor should have an X0 bond to floor.
• All air conditioning cabinets mounted on the floor with a bonding connection to the floor.
• A vertical building steel grounding point is preferred over long wire runs to electrical service entrance.
• Very short straps to the floor are preferred over excess lengths.
HP recommendations concerning the proper grounding of a raised floor or signal reference grid are closely
aligned with other agencies such as the NEC and IEEE.
Figure 5-1 Raised Floor Metal Strip Ground System
System Installation Guidelines
This section contains information about installation practices. Some common pitfalls are highlighted. Both
power cable and data communications cable installations are discussed.
Ground wire
to power panel
Grounding clamp
Band and pedestal Grounding braid
to computer equipment
Grounding grid element
Hex bolt
Floor panel
11/30/99
60SP010A
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