Specifications and Safety Warnings
DC Power Supply Warnings
Beta Draft Confidential
CBX 500 Multiservice WAN Switch Hardware Installation Guide
4/5/03
2-5
DC Power Supply Warnings
Safety Warnings
1. There are mechanical and electrical shock hazards present throughout the system
if one or more of the modules is removed. There are no operator serviceable
components. Only qualified personnel are allowed to service the unit.
Warning –
•
The DC power supply must be installed only in restricted access areas (dedicated
equipment rooms, equipment closets, or the like) in accordance with Articles 110-16,
110-17, and 110-18 of the National Electrical Code, ANSI/NFPA 70. Connect to a 48V DC
source which is electrically isolated from the AC source and which is reliably connected to
earth.
•
This equipment is designed to permit the connection of the grounded conductor of the DC
supply circuit to the grounding 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 grounding
electrode conductor or to a bonding jumper from a grounding terminal bar or bus to
which the DC supply system grounding 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 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.
–
The DC supply source is to be located within the same premises as the equipment.
–
There shall be no switching or disconnecting devices in the grounded circuit conductor
between the DC source and the point of connection of the grounding electrode
conductor.
•
A readily accessible disconnect device must be provided in the fixed wiring for a DC
power supply. It must be suitable for the rated voltage and current specified.
•
Safe operation of this unit requires connection to a grounded outlet. To prevent possible
injury from voltages on the telecommunications network, disconnect all
telecommunications network lines before disconnecting the unit from the grounded outlet.
