Three-Phase Power Considerations For Racks; Cable Management; Cable Retention - Hitachi g200 Reference Manual

Three-phase power considerations for racks

Increasing power requirements for racks are making the use of three-phase
power at the rack level compelling.
• With single-phase power, at any given time the voltage across the hot and
• Three-phase power uses three cycles that are 120 degrees out of phase,

Cable management

Rack installations should be planned for operational efficiency, ease of
maintenance, and safety. Hitachi offers the Backend Configuration Utility
(BECK), a graphical, cable-management application that can relieve the
typical cable congestion created when populating a rack with storage systems
and their accessories.

Cable retention

Unintentional unplugging or unseating of a power cable can have a serious
impact on the operation of an enterprise storage system. Unlike data cables,
power connectors do not have built-in retention mechanisms to prevent this
from happening.
To prevent accidental unplugging or unseating of power cables, the storage
system includes a rubber cable-retention strap near the AC receptacle on
each controller. These straps, shown in the following image, loop around the
neck of a power cable connector, and the notched tail is slipped over the hook
of the restraining bar fixed to the storage system.
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neutral conductors can be anywhere between its peak (maximum) and
zero. Electrical conductors must be large to meet high amperage
requirements.
which never allows the voltage to drop to zero. The more consistent
voltage derived from the three hot conductors results in smoother current
flow and allows small-gauge conductors to be used to distribute the same
amount of AC power. As a result, the load balancing and increased power
handling capabilities of three-phase distribution can result in more efficient
and less costly installations that require fewer AC cables and PDUs.
Data and power cables
Hitachi Virtual Storage Platform G200 Hardware Reference Guide