User Service Guide, Third Edition - HP Integrity cx2620 Server

must be electrically isolated by double or reinforced insulation from any hazardous AC source.
The DC source must be capable of providing up to 650 Watts of continuous power per feed pair.
WARNING! You are responsible for installing a properly rated DC power disconnect for the
server system. This main disconnect must be readily accessible, and it must be labeled as
controlling power to the server. The circuit breaker of a centralized DC power system may be
used as a disconnect device when easily accessible and should be rated no more than 10 amps.
Grounding the Server
The site building shall provide a safety ground/protective earth ground to all cabinets. The
required chassis grounding lug for NEBS compliance is provided on the server rear panel
(Figure 2-2).
WARNING! To avoid the potential for an electrical shock hazard, you must reliably connect
an earth grounding conductor to the server. The earth grounding conductor must be a minimum
14AWG connected to the earth ground stud(s) on the rear of the server. The safety ground
conductor should be connected to the chassis stud with a Listed closed two-hole crimp terminal
with a maximum width of 0.25 inch. The nuts on the chassis earth ground studs should be
installed with a 10 in/lbs torque. The safety ground conductor provides proper grounding only
for the server. You must provide additional, proper grounding for the rack and other devices
installed in it.
Figure 2-2 Chassis Ground Lug
Install a PE (protective earthing) conductor that is identical in size, insulation material, and
thickness to the branch-circuit supply conductors. The PE conductor must be green with yellow
stripes. The earthing conductor is to be connected from the unit to the building installation earth
or, if supplied by a separately derived system, at the supply transformer or motor-generator set
grounding point.
Electrical Specifications 47