Dell PowerEdge Rack Enclosure 4820 - Manual (Page 7)

Dell Data Center Site Planning Guide
Page 5
 Re-provision air where a higher demand exists. There are numerous types of vent tiles
with varying resistance to flow. By putting more restrictive tiles or a lesser number of
vent tiles in areas where the equipment requirements are lower, greater volumes of
chilled air can be rerouted to areas with greater chilled air requirements.
 Consider implementing containment to provide full separation between hot and cold
air.
Electrical Requirements
Like cooling, the electrical branch wiring distribution and routing to the rack should be an integral part
of the planning for a rack’s placement and alignment to other racks. The rack system should not be
connected to an AC power source that is also being used by industrial equipment such as electric
motors, welders, elevators, copiers, or large monitors.
Consideration should be given to methodology used to deliver the branch wiring to the rack. Branch
wiring distribution methodology can influence adoptability of cooling strategies mentioned above.
If overhead power is planned, there may need to be provisions made for an overhead electrical
distribution assembly structure (wire way, raceway, bus duct, or other solution). If power will be
routed under the floor, there may be a need for an area or space below the rack to accommodate
similar types of assembly structure.
Consideration should be given for the grounding of the rack in compliance with the facilities design and
local code. This may be supported through a power distribution unit (PDU) installed in the rack. Follow
your regional electrical guidelines. If you need assistance selecting rack-level PDU and UPS solutions,
please refer to dellpdu.com and dellups.com for guidance.
Safety Considerations
Ensure that the site complies with the following local codes and regulations, as applicable:
 Building codes
 Fire codes
 Electrical codes
 Insurance regulations
 Fire detection
 Fire extinguishers (carbon dioxide or halon is recommended)
 Approved evacuation plan
 Fireproof cabinets for storage of flammable material (such as printer paper)
Rack Handling Considerations
WARNING: Rack cabinets can be extremely heavy and move easily on the wheels and casters.
The cabinet has no brakes. Use extreme caution while moving the rack cabinet. Retract the leveling
feet when relocating the rack cabinet. Avoid long or steep inclines, rough surfaces, or ramps where loss
of cabinet control may occur. Extend the leveling feet for support and to prevent the cabinet from
rolling.
WARNING: Avoid rolling the rack cabinet over rough surfaces. Hard impacts to the casters
could cause them to break, and the rack could become unstable and may tip over.