HP StorageWorks XP24000 Disk Array Site Preparation Guide, v01 (AE131-96002, June 2007)

Fault tolerant AC power examples
Figure 10 Fault tolerant AC wiring diagram
When receptacles are used to connect disk array components to AC power, they must include a
dedicated ground connection that is insulated from the receptacle. It is important that the receptacle
box be grounded with an additional ground connection that is separate from the dedicated ground.
The additional ground can be hard conduit.
Specific power plugs and receptacles are required for the DKC and DKUs depending on the power
option you specify when ordering the HP XP24000 disk array. The power cords on 60 Hz cabinets
are shipped with plugs attached. The power cords on 50 Hz cabinets are shipped without plugs. You
are responsible for having the correct plugs and receptacles installed by an electrician in compliance
with local electrical requirements and practices.
See “Electrical specifications for the HP XP24000 Disk Array” on page 47 for specific plug and
receptacle part numbers and ordering information.
CAUTION:
When installing the receptacles, the electrician must ensure that each receptacle has its own neutral (if
required) and ground. Using the same neutral/ground for more than one circuit causes voltage loss and
heat problems and can create a fire hazard. A shared neutral conductor that fails open-circuit can cause
overvoltage damage to equipment.
Power line transients
Heavy electrical loads from nearby machinery or equipment (for example, elevators or electric welders)
can cause intermittent system problems with sophisticated electronic equipment, even if that equipment
is on a separate circuit breaker. When faced with these conditions, provide a separate, completely
independent power panel with an isolated ground and circuit breaker coming directly from the main
building power source or secondary power source.
Site requirements for the HP XP24000 Disk Array44