HP Integrity Superdome SX1000 User Guide, Sixth Edition - HP Integrity Superdo - Page 148

Site Preparation Electrical and Environmental Guidelines 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 Ground wire to power panel Floor panel Hex bolt Grounding clamp Grounding grid element Band and pedestal Grounding braid to computer equipment 60SP010A 11/30/99 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. 136 Chapter 5