l
Site wiring must include an earth ground connection to the DC power source. Grounding must comply with local,
national, or other applicable government codes and regulations.
l
Power circuits and associated circuit breakers must provide sufficient power and overload protection.
NOTE For related information about power requirements, including DC power cables, see
Weight guidelines
Refer to
"Physical requirements" on the facing page
for detailed weight and size specifications.
l
The weight of an enclosure depends on the number and type of modules installed.
l
Ideally, use two people to lift a storage enclosure. One person can safely lift an enclosure if its weight is reduced by
removing the power and cooling modules and disk drive modules.
l
Do not place enclosures in a vertical position. Always install and operate the enclosures in a horizontal/level
orientation.
l
When loading a rack with enclosures, fill the rack from bottom up; and empty the rack from top down to maintain
optimal rack stability.
l
When installing enclosures in the rack, make sure that any surface over which you might move the rack can support
the weight. To prevent accidents when moving equipment—especially on sloped loading docs and up ramps to
raised floors—ensure you have a sufficient number of helpers. Remove obstacles such as cables, packing, and other
objects from the floor.
l
To prevent the rack from tipping, and to minimize personnel injury in the event of a seismic occurrence, securely
anchor the rack to a wall or other rigid structure that is attached to both the floor and to the ceiling of the room.
Electrical guidelines
l
These enclosures work with single-phase power systems having an earth ground connection. To reduce the risk of
electric shock, do not plug an enclosure into any other type of power system. Contact your facilities manager or a
qualified electrician if you are not sure what type of power is supplied to your building.
l
Enclosures fitted with AC PCMs use a grounding-type (three-wire) power cord. To reduce the risk of electric shock,
always plug the AC power cord into a grounded power outlet.
l
Enclosures fitted with DC PCMs use a DC power cable with positive (+), negative (-) and ground connections. Connect
this cable as described in
.
l
Do not use household extension cords with the enclosures. Not all power cords have the same current ratings.
Household extension cords do not have overload protection and are not meant for use with computer systems.
Ventilation requirements
Refer to
"Environmental requirements" on the facing page
for detailed environmental requirements.
l
Do not block or cover ventilation openings at the front and rear of an enclosure. Never place an enclosure near a
radiator or heating vent. Failure to follow these guidelines can cause overheating and affect the reliability and
warranty of your enclosure.
l
Leave a minimum of 15 cm (6 inches) at the front and back of each enclosure to ensure adequate airflow for cooling.
No cooling clearance is required on the sides, top, or bottom of enclosures.
l
Leave enough space in front and in back of an enclosure to allow access to enclosure components for servicing.
Removing a component requires a clearance of at least 37 cm (15 inches) in front of and behind the enclosure.
Cabling requirements
l
Keep power and interface cables clear of foot traffic. Route cables in locations that protect the cables from damage.
l
Route interface cables away from motors and other sources of magnetic or radio frequency interference.
84
Appendix B
Specifications and requirements