Fire-Lite ECC-50 - UL Power-limited Wiring Requirements

Emergency Command Center Manual — P/N LS10001-000FL-E:D 9/3/2014 49
UL Power-limited Wiring Requirements Installation
2.12 UL Power-limited Wiring Requirements
Power-limited and nonpower-limited circuit wiring must remain separated in the cabinet. All
power-limited circuit wiring must remain at least 0.25" away from any nonpower-limited circuit
wiring. Furthermore, all power-limited and nonpower-limited circuit wiring must enter and exit the
cabinet through different knockouts and/or conduits. A typical wiring diagram for the ECC-50/100
with two speaker circuits is shown below.
Figure 2.30 Typical Wiring Diagram for UL Power-limited Requirements
Power-limited Circuits
(Class 2)
e
c
c
u
l
p
w
r
.
w
m
f
Power-limited Circuits
(Class 2)
Power-limited
Circuits
(Class 2)
AC Power
Nonpower-
limited Circuit
Power-limited
Circuits
(Class 2)
Power-limited
Circuits
(Class 2)
to batteries
nonpower-
limited circuit
Power-limited
Circuits
(Class 2)
NOTE: Use of the 70V transformer makes all power-limited circuits Class 3.