Allied Telesis AT-8550SP - Manual (Page 66)

Installation
66
Wiring a DC Powered Unit
For a DC powered switch, perform the following steps:
1. Before you attach wires to the DC terminal block at the rear of the
switch, review the following warning:
Warning
It is suggested that as a safety precaution, a 10 Amp circuit breaker
should be installed at the supply end of the cable to be used with
this LAN equipment.
ALWAYS connect the wiring to the LAN equipment before
connecting the wiring to the breaker. To avoid the danger of
physical injury from electrical shock, do not work with HOT feeds.
Always be sure that the breaker is in the OFF position before
connecting the wiring to the breaker.
16
Note
A tray cable is required to connect the power source if the unit is
powered by centralized DC power. The tray cable must be UL listed
Type TC tray cable and rated at 600 V and 90 degree C, with three
conductors, minimum 14 AWG.
2. On the rear side of the chassis is a DC terminal block. Starting from
the left side of the terminal block, identify the positive, frame
ground, and negative terminals using the symbols beneath the
terminal block or the illustration in Figure 24.
Figure 24 Positive, Ground, and Negative Terminals
3. With a 14-gauge wire-stripping tool, strip the three wires in the tray
cable coming from the DC input power source to 8mm
± 1mm (0.31
in.,
± 0.039 in.).
FOR CENTRALIZED DC
POWER CONNECTION,
INSTALL ONLY IN A
RESTRICTED AREA
DC INPUT
36-60VDC
Positive
Ground
Negative