Alcatel 7750 SR-12, Руководство по установке

Страница: 67 / 158

Installing Power Supplies
7750 SR-12
Page 65
I
NSTALLING
DC PEM
S
DC
This section provides information and instructions to perform the following:
• DC Power Warnings and Notes on page 65
• Installing a DC PEM on page 67
→
Installing a DC PEM on page 67
→
DC-Input Power Wiring on page 69
→
Preparing the Power Cable on page 69
→
DC Input Terminal Block Wiring on page 71
DC P
OWER
W
ARNINGS AND
N
OTES
Danger:
• The unit should be connected to a DC branch circuit with a maximum 80A circuit breaker or
fuse which meets the requirements for branch circuit protection. A suitable disconnect device
must be provided in the DC branch, either a circuit breaker or switch that can be employed to
disconnect power to the system during servicing.
• Confirm that the DC power source is OFF during installation. The power source should be a
safety extra-low voltage (SELV) source.
• The 7750 SR-12 router with DC power entry modules should be installed only in restricted
access areas (such as dedicated equipment rooms and electrical closets) in accordance with
Articles 110-26 and 110-27 of the most recent National Electrical Code ANSI/NFPA 70.
• Before connecting or disconnecting ground or power wires to the chassis, ensure that power
is removed from the DC circuit.
Caution:
• The 7750 SR-12 must be directly connected to the DC power supply system earthing
electrode conductor or to a bonding jumper from an earthing terminal bar or bus to which the
DC power supply system earthling electrode is connected.
• The DC power supply source must be located within the same premises as this equipment.
• There must be no switching or disconnecting devices in the earthed circuit conductor
between the DC source and the point of connection of the earthing electrode conductor.