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HP StorageWorks XP12000 Disk Array Site Preparation Guide
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 XP12000
disk array. The power cords on 60 Hz cabinets are shipped with plugs
attached and connected. 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.
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.
See
Appendix A
for specific plug and receptacle part numbers and ordering
information.
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.
If necessary, an HP representative can measure your power line noise level
and make appropriate recommendations concerning the use of line
treatment devices.
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