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32 HP StorageWorks Disk Array XP128: Site Preparation Guide
your electrician, can determine the line voltage and make
recommendations. Avoid the use of a line voltage conditioner.
Make sure that the selected power distribution unit (if one is used) supports
the correct voltage to support your entire system.
Branch circuit breakers
See “Branch circuit requirements” (page 42) for the specific branch circuit
requirements for your power situation.
Three-phase branch circuit breakers
The power cords supplied with each HP Disk Array XP128 configured for
three-phase power are sized for connection to a 30-amp circuit.
Single-phase branch circuit breakers
The power cords supplied with each HP Disk Array XP128 configured for
single-phase power are sized for connection to a 30 or 50-amp circuit.
30-amp, single-phase power is available by special order only.
Frequency
AC line frequency is normally determined by your local power providers.
In some cases, electrical power is supplied by motor-generators. Shifts in
AC line frequency can cause system errors. Your HP CE can monitor the
frequency of the input AC line power and make recommendations, if
necessary.
AC line voltage requirements
The AC power requirements for your HP Disk Array XP128 listed are for
each power cord. Each array frame has two or four power cords. In case of
a failure of the power source for one cord, the power requirements and
hence the current requirement for the remaining power cord will
approximately double.