Safety And Dedicated Ground; Grounding; Ac Power Requirements - HP StorageWorks XP10000 - Disk Array Manual

Safety and dedicated ground

The primary reason for 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

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.

AC power requirements

The disk array primary rack has four separate connections to 200 VAC, single-phase, 20-amp power.
The second rack has two connections to AC power in the minimum configuration (four recommended)
and four connections to AC power in the maximum configuration. Power requirements are 200 VAC,
single-phase, 20-Amps.
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 AC power cords and plugs are available to suit the power requirements and receptacles in
your location. You can specify the cords and plugs you need when you order the HP XP10000 disk
array. 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 chapter 3
ordering information.
38 Site requirements for the XP10000 disk array
for specific power requirements as well as plug and receptacle part numbers and