HP ProLiant SL270s HP ProLiant SL Servers Planning Guide - Page 29

Equipment grounding implementation details Connect all HP equipment cabinets to the site ground grid as follows: 1. Attach one end of each ground strap to the applicable cabinet ground lug. 2. Attach the other end to the nearest pedestal base (raised floor) or cable trough ground point (nonraised floor). 3. Check that the braid contact on each end of the ground strap consists of a terminal and connection hardware (a 6-mm [0.25-in] bolt, nuts, and washers). 4. Check that the braid contact connection points are free of paint or other insulating material and treated with a contact enhancement compound (similar to Burndy Penetrox). System installation guidelines In domestic installations, install the proper receptacles before the HP equipment arrives. For installation procedures, see the appropriate installation guide. Wiring connections Expansion and contraction rates vary among different metals. Therefore, the integrity of an electrical connection depends on the restraining force applied. Connections that are too tight can compress or deform the hardware and cause it to weaken. This deformation usually leads to high impedance, preventing circuit breakers from tripping when needed or contributing to a buildup of high frequency noise. CAUTION: Connections that are too loose or too tight can have a high impedance that causes serious problems, such as erratic equipment operation. A high impedance connection overheats and sometimes causes fire or high temperatures that can destroy hard-to-replace components such as distribution panels or system bus bars. Wiring connections must be properly torqued. Many equipment manufacturers specify the proper connection torque values for their hardware. Ground connections must only be made on a conductive, nonpainted surface. When equipment vibration is present, lock washers must be used on all connections to prevent connection hardware from working loose. Data communications cables Power transformers create high-energy fields in the form of EMI. Heavy foot traffic can create ESD that can damage electronic components. Route data communications cables away from these areas. To reduce the effects of external fields, use shielded data communications cables that meet approved industry standards. Power configuration The HP ProLiant s6500 Chassis can be powered from single-phase AC power sources. Power supply options are available at the time of purchase through either the Build-to-Order or Configure-to-Order processes. Existing units can be converted from one power source to another when necessary. For more information on converting an enclosure power source, see the HP website (http://h18004.www1.hp.com/products/solutions/power). Power requirements and considerations 29