Rack system safety precautions
13
CAUTION:
To avoid danger of the rack falling over, under no circumstances should more than one enclosure be moved
out of the cabinet at any one time.
•
The system must be operated with low pressure rear exhaust installation. The back pressure created by rack doors
and obstacles is not to exceed 5 pascals (0.5 mm water gauge).
•
The rack design should take into consideration the maximum operating ambient temperature for the enclosure,
which is 35ºC (95ºF) for JBODS/EBODs. Above an altitude of 900 meters, derating applies as per ASHRAE Class A2.
•
The rack should have a safe electrical distribution system. It must provide over-current protection for the enclosure
and must not be overloaded by the total number of enclosures installed in the rack. When addressing these concerns,
consideration should be given to the electrical power consumption rating shown on the nameplate.
•
The electrical distribution system must provide a reliable earth connection for each enclosure in the rack.
•
Each power supply line cord will have an earth leakage current of 1mA. The design of the electrical distribution
system must take into consideration the total earth leakage current from all the PSUs in all the enclosures. The rack
will require labeling with “High Leakage Current. Earth connection essential before connecting supply.”
•
The rack—when configured with the enclosures—must meet the safety requirements of UL2416, UL60950-1, and IEC
60950-1.
Leveling an enclosure rack
The rack should be installed on a flat, leveled surface. It should not rest inclined under any circumstances as this could
cause uneven stress on the rack structure, and also on the ground. Enclosures placed in such uneven racks resist smooth
movement in the racks while pushing them in or pulling them out. This can eventually damage the enclosure rails. For
safe operation, follow the leveling instructions as prescribed by the rack manufacturer in the rack documentation.
CAUTION:
Do not install any enclosures into a rack until and unless racks are leveled.
