NFS2-3030/E Installation Manual — P/N 52544:N1 07/18/2014
35
UL Power-limited Wiring Requirements
Installation
3.10.4 Auxiliary Power Supply Connections
If an optional auxiliary power supply is installed in the cabinet, connect it at this time. Follow the
connection procedures specified in your auxiliary power supply manual.
3.11 UL Power-limited Wiring Requirements
Power-limited and non-power-limited circuit wiring must remain separated in the cabinet. All
power-limited circuit wiring must remain at least 0.25 inches (6.35 mm) from any non-power-
limited circuit wiring. All power-limited and non-power-limited circuit wiring must enter and exit
the cabinet through different knockout and or conduits. To maintain separations easily, it is
recommended that non-power-limited modules are grouped together. For example, use a separate
row or designated side of the enclosure so that power-limited and non-power-limited wiring do not
cross. Install tie wraps and adhesive squares to secure the wiring.
For a quick reference to control panel circuits, refer to Figure 2.1 at the start of this manual. The
power-limiting label inside your cabinet door identifies which compatible modules have power-
limited or non-power-limited wiring.
Figure 3.19 Typical Wiring in a Four-Row Backbox
Component
Status
CPU
The green Power indicator will come on when power is coming from the main
power supply. The yellow Trouble indicator will come on until batteries are
connected.
Main power supply
The green AC indicator will come on when AC is supplied.
The yellow Trouble indicator will come on until batteries are connected.
Each auxiliary power
supply
The yellow Trouble indicator comes on because batteries are not connected.
Table 3.2 AC Power Checklist
Nonpower-limited circuit
(Assumes relay is connected to a
non-power-limited signal source)
Power-limited
circuits
Loop-
control &
Loop-
expander
modules
NFS2-3030
Side-View
Power-limited
circuits
Separating non-power-limited and
power limited circuits within the
backbox with adhesive squares
amp
s
24cab3
w
rngsi
d
e
.w
m
f
3
030U
LW
IR
IN
G.
w
m
f
NOTE:
If additional knockouts are added to the backbox,
proper separation of power-limited and non-power-limited
wiring should be maintained.
