Installing the Alarm System 141
Practice 450-1011-201
17. Installing a -48 Vdc Power
Distribution System
This part describes how to install a -48 V Power Distribution System. This system
is used when the cabinets are powered from -48 V office battery, rather than
commercial 110/220 Vac power.
Installing a Factory-configured -48 V Power System
This procedure describes how to install a -48 Vdc Power Distribution System on
cabinet systems. The ordering codes provided for Northern Telecom products reflect
the most recent versions at the time of printing.
- CAUTION -
If, for any reason, the input box requires service, power to the system must be
removed at the main disconnect device. This must be done by qualified
personnel.
A Distribution Box can be serviced after removing power to the system by
switching the circuit breaker located in the input box to the OFF position.
(1) Remove the preassembled power system from the shipping container. The
system is ready to install on the cabinets. Connection hardware required to
connect long or short cable and the input box to the cabinet is supplied with the
system.
(2) If the system is operating, make sure all users have signed off, and power the
system down.
(3) Remove the ac input cord from the input jumper (if applicable).
(4) Remove the dc serial ID label from the plastic bag shipped with the input box.
The following label fields have been filled in at the factory: volts (dc), amps,
and model number (NT4G01__).
(5) Copy into the appropriate fields on the dc label, in permanent ink, the following
information from the ID label located on the ac input jumper: serial number,
manufacturing date code, and Rel/Mix number.
