1. This equipment shall be connected directly to the DC supply system
earthed 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 earthed conductor of the same DC supply circuit and the
earthing conductor, and also the point of earthing of the DC system.
The DC system shall not be earthed 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 earthed circuit
conductor between the DC source and the point of connection of the
earthing electrode conductor.
Rack Mount 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 Earthing - Reliable earthing of rack-mounted 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).
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