Site Preparation Guide, Second Edition - HP Integrity cx2620 Server

2 General Site Preparation Guidelines
This chapter contains recommendations and best practices to consider for improving site efficiency
and tolerance before the installation or operation of an HP server system. This general information
is intended for different server models and vendor sites around the world and is not a substitute
for recommendations or requirements from the manufacturer or vendor of a specific product.
NOTE: Refer to the specific server service guide for the guidelines required to support the
specific server.
The following information provides general principles and practices to consider before the
installation or operation of the system. These guidelines apply to all of the customer environments
an HP product is likely to be installed in:
• Controlled computer room
• Controlled office
• Uncontrolled office/home
• Light industrial
• Mobile/portable
However, the implementation of these guidelines will change from customer to customer and
from one environment to another.
This section addresses the following topics:
• “Electrical Factors” (page 21)
• “Environmental Elements” (page 29)
• “Facility Characteristics” (page 36)
• “Space Requirements” (page 38)
• “Conversion Factors and Formulas” (page 42)
• “Example of an Installation Schedule” (page 43)
• “Sample Site Inspection Checklist” (page 43)
• “Delivery Survey” (page 46)
Electrical Factors
Synopsis
DC Electrical Distribution System
HP recommends using an electrical distribution system that might exceed your normal electrical
guidelines. This recommendation is based on experiences with HP customers who have a low
occurrence of unexpected interruptions. As your system availability needs increase, these
recommendations become more important.
Recommended electrical distribution hardware includes receptacles, dc wiring, conduits, and
breakers that are sized for maximum-rated loads, rather than for typical loads. Between the
receptacle and nearest X0bond and the transformers, do not exceed 75 feet (22.86 m) because
connection points can become loose over time and subject to loading problems.
HP recommends sourcing a higher input voltage to the stepdown transformer within 75 feet
(22.86 m). For example, if 480-volt current is available in the building, ensure that distribution
transformers in the server room are 480/208-volt stepdown. In an optimum electrical distribution
system:
• Electrical infrastructure is rated for maximum load.
• The distance from a receptacle to power source X0 is less than 75 feet (22.86 m).
Electrical Factors 21