ADTRAN T3SU 300, User Manual

Page: 33 / 145

Chapter 2. Installation and Operation
61202217L1-1B T3SU 300 User Manual 33
Figure 2-1. DC Power Connector
The following UL requirements must be met during installation of
the DC version of the T3SU 300:
1. The unit must be connected to a reliably grounded
-24 or -48 VDC source which is electrically isolated from the AC
source.
2. The branch circuit overcurrent protection should be a fuse or
circuit breaker rated 48 V, 15 A.
3. The unit should be installed in accordance with the
requirements of NEC NFPA 70.
4. A readily accessible disconnect device that is suitably approved
and rated should be incorporated in the fixed wiring.
INSTALLING THE UNIT
The T3SU 300 can be used as a desktop stand-alone device or
mounted into a standard 19-inch equipment rack. The chassis can
also be installed in a 23-inch equipment rack by using the 23-inch
Rack Kit (P/N 1200171L1).
Rackmount Installation
Follow these steps to mount your unit into a rack:
1. Install the 19-inch or 23-inch rackmount flanges on each side of
the T3SU 300 enclosure at one of the three available positions.
Symbol Definition
Frame ground.
+ Positive side of DC power source
(usually ground).
- Negative side of DC power source
(usually -48V).