HP StorageWorks 200 Storage Virtualization System site preparation guide (AE071-96003, October 2006)

Electrical requirements
The following text explains the electrical requirements of your site to support the HP system.
Line voltage
Line voltage (AC) at the wall power outlet is a function of the local power utilit y and your building power
distribution network. Voltages outside of the operating range of the HP system can cause intermittent
system errors or a complete system shutdown. If required, your electrician can determine the current line
voltage. Then contact your HP representative for recommendations. See A
C line voltage requirements
for AC line voltage details.
Avoid the use of a line voltage conditioner.
Make sure that a p ower distribution unit (if used) provides the correct voltage to support your entire system.
Branch circuit breakers
See Branc
h circuit requirementsand for details about branch circuits for your power situation.
Single-phase branch circuit breakers
The power cords supplied are specified for connection to a single-phase, 20-amp circuit.
Frequency
Usually
, AC line frequency is determined by your local power p roviders. In some cases, electrical power
is supplied by generators. Shifts in AC line frequency can cause system errors. Your H P representative
can monitor the frequency of the input AC line power and make recommendations, if necessary. The
system requires that the line frequency b e within 0.5 Hz of the rated line frequency (50 Hz or 60 Hz).
Safety and dedicated earth ground
The primary reason for earth grounding electrical systems is safety. The safety ground is required by the
National Electric Code (USA) and most other local, regional, and national codes. In addition to safety
ground, HP requires that a dedicated (earth reference) ground be installed as a common reference point
for all system components. Consult with an HP representative and your electrician to ensure that your
electrical system meets all loc al and national safety codes.
Grou
nding requirements
Your
site’s electrical subsystem must meet all of the following conditions:
• Earth g rounding as prescribed by your local country codes.
• An insulated grounding conductor that is identical in size and insulation material and thickness
to t
he ungrounded branch-circuit supply conductors. It s hould be green, with or without yellow
str
ipes, and is to be installed as a part of the branch circuit that supplies the unit or system. This
means the ground conductor must be run in the same conduit, armored cable, or other cable
bundle as the phase wires.
• Th
e grounding conductor should be g rounded to earth at the service equipm ent or other
ac
ceptable building earth ground such as the building frames (in case of a high-rise steel-frame
structure).
• IT-config ured grounding systems are not certified for use with the HP system as these grounding
systems may not have solidly conductor-connected grounded power systems and/or they may
have resistive impedance inserted in ground and/or neutral lines. The HP system requires a
solidly conductor-connected ground and may require a separate neutral in the case of WYE or
STAR connections. For the HP system, TN grounding systems are preferred.
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