Flexible output distribution cables for use in data processing areas under a raised floor are
optional and may be factory supplied. Cable lengths and layout should be well planned:
• Cable access - Cable routes should follow aisles between equipment. This will
facilitate access to cables for installation, routine inspection, and future changes.
• Cable length - Measure the distance to the load equipment following right-angle
paths, rather than diagonally or directly. Always measure to the extreme far side of
the equipment with respect to the unit to insure adequate cable length.
• Air circulation - Prevent restriction of airflow under the raised floor by running
the flexible conduits flat on the sub-floor, in parallel paths.
For best performance, the Rack Mount Power Distribution Unit should be located as close to
the load as practical.
Initial system output loading should be between 50% and 75% of rated capacity. This allows
the addition of future loads without immediately investing in another distribution unit.
Keep the load balanced - Balancing of loads is good design practice on any 3-phase system.
Accordingly, each distribution panel is load-balanced at the factory, based on output branch
circuit breaker sizes. All additions to the system should be arranged so as to preserve this
balance.
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