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Appendix
83
DC Power
The system relies on the protective devices in the building installation for
protection against short-circuit, overcurrent, and earth (grounding) fault.
Ensure that the protective devices in the building installation are properly
rated to protect the system, and that they comply with national and local
codes.
Ensure that there is a readily accessible disconnect device incorporated in
the building's installation wiring.
A separate protective earthing terminal is provided on this product and
shall be permanently connected to earth.
For the DC supply circuit, select a DC supply cable that is certified by UL,
AWM VW-1 Style 1015, minimum 16 AWG, minimum 105º C, minimum
300 V.
CAUTION: This equipment is designed to permit the connection of
the earthed conductor of the DC supply circuit to the earthing conductor at
the equipment. If this connection is made, all of the following conditions
must be met:
This equipment shall be connected directly to the DC supply system
earthing electrode conductor or to a bonding jumper from an earthing
terminal bar or bus to which the DC supply system earthing electrode
conductor is connected.
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.
The DC supply source is to be located within the same premises as this
equipment.
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.
WAR NING : This unit is intended for installation in restricted access
areas. A restricted access area (server room, data center, etc.) is where
access can only be gained by service personnel through the use of a special
tool, lock and key, or other means of security, and is controlled by the
authority responsible for the location.