HP 200 HP StorageWorks 200 Storage Virtualization System site preparation guid - Page 33

Electrical requirements, Line voltage, Branch circuit breakers, Frequency

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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 utility 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 AC line voltage requirements for AC line voltage details. Avoid the use of a line voltage conditioner. Make sure that a power distribution unit (if used) provides the correct voltage to support your entire system. Branch circuit breakers See Branch 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 providers. In some cases, electrical power is supplied by generators. Shifts in AC line frequency can cause system errors. Your HP representative can monitor the frequency of the input AC line power and make recommendations, if necessary. The system requires that the line frequency be 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 local and national safety codes. Grounding requirements Your site's electrical subsystem must meet all of the following conditions: • Earth grounding as prescribed by your local country codes. • An insulated grounding conductor that is identical in size and insulation material and thickness to the ungrounded branch-circuit supply conductors. It should be green, with or without yellow stripes, 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. • The grounding conductor should be grounded to earth at the service equipment or other acceptable building earth ground such as the building frames (in case of a high-rise steel-frame structure). • IT-configured 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. HP StorageWorks 200 Storage Virtualization System site preparation guide 33

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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 utility 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
l
i
n
e
v
o
l
t
a
g
e
r
e
q
u
i
r
e
m
e
n
t
s
for AC line voltage details.
Avoid the use of a line voltage conditioner.
Make sure that a power distribution unit (if used) provides the correct voltage to support your entire system.
Branch circuit breakers
See
B
r
a
n
c
h
c
i
r
c
u
i
t
r
e
q
u
i
r
e
m
e
n
t
s
and for details about branch circuits for your power situation.
Single-phase branch circuit breakers
The power cords supplied are speci
fi
ed for connection to a single-phase, 20-amp circuit.
Frequency
Usually, AC line frequency is determined by your local power providers. In some cases, electrical power
is supplied by generators. Shifts in AC line frequency can cause system errors. Your HP representative
can monitor the frequency of the input AC line power and make recommendations, if necessary. The
system requires that the line frequency be 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 local and national safety codes.
Grounding requirements
Your site’s electrical subsystem must meet all of the following conditions:
•
Earth grounding as prescribed by your local country codes.
•
An insulated grounding conductor that is identical in size and insulation material and thickness
to the ungrounded branch-circuit supply conductors. It should be green, with or without yellow
stripes, 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.
•
The grounding conductor should be grounded to earth at the service equipment or other
acceptable building earth ground such as the building frames (in case of a high-rise steel-frame
structure).
•
IT-con
fi
gured grounding systems are not certi
fi
ed 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.
HP StorageWorks 200 Storage Virtualization System site preparation guide
33