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This equipment is designed to permit the connection of the grounded conductor of
the DC supply circuit to the grounded conductor at the equipment. If this
connection is made, all of the following conditions must be met:
1.
This equipment shall be connected directly to the DC supply system
grounded electrode conductor or to a bonding jumper from a grounded
terminal bar or bus to which the DC supply system grounding electrode
conductor is connected.
2.
This equipment shall be located in the same immediate area (such as,
adjacent cabinets) as any other equipment that has a connection between
the grounded conductor of the same DC supply circuit and the grounding
conductor, and also the point of grounding of the DC system. The DC
system shall not be grounded elsewhere.
3.
The DC supply source shall be located within the same premises as this
equipment.
4.
Switching or disconnecting devices shall not be in the grounded circuit
conductor between the DC source and the point of connection of the
grounding electrode conductor.
Rackmount Precautions
1.
Elevated Operating Ambient - If installed in a closed or multi-unit rack
assembly, the operating ambient temperature of the rack environment may
be greater than room ambient. Therefore, consideration should be given to
installing the equipment in an environment compatible with the maximum
ambient temperature (Tma) specified by the manufacturer.
2.
Reduced Air Flow - Installation of the equipment in a rack should be such
that the amount of air flow required for safe operation of the equipment is
not compromised.
3.
Mechanical Loading - Mounting of the equipment in the rack should be
such that a hazardous condition is not achieved due to uneven mechanical
loading.
4.
Circuit Overloading - Consideration should be given to the connection of
the equipment to the supply circuit and the effect that overloading of the
circuits might have on overcurrent protection and supply wiring.
Appropriate consideration of equipment nameplate ratings should be used
when addressing this concern.
5.
Reliable Grounding - Reliable grounding of rackmounted equipment
should be maintained. Particular attention should be given to supply
connections other than direct connections to the branch circuit (e.g., use
of power strips).