Installation
NEC Power-limited Wiring Requirements
18
FCPS-24FS PN 51883:B 12/04/02
2.4 NEC 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 circuit wiring and
nonpower-limited circuit wiring must enter and exit the cabinet through different
conduits. One such example of this is shown below. Your specific application may
require different conduit knockouts to be used. Any conduit knockouts may be used.
For power-limited applications, use of conduit is optional.
1 2 3 4 5 6 7 8
O N
TB1
J2
T
R
AN
SF
O
R
M
E
R
2
T
R
A
NS
FO
R
M
ER
1
J1
F1
JP4
30V
15A
SW1
TB4
JP3
J3
TB5
TB2
JP1
JP2
+ -
EARTH NEUT HOT
OUT4
- NAC4 +
OUT3
- NAC3 +
OUT2
- NAC2 +
OUT1
- NAC1 +
AUX -
IN2-
IN2+
OUT1-
OUT1+
IN1-
IN1+
SYNC IN -
SYNC IN +
AUX +
NO NC
AUX TBL
COM
BATTERY
AC
AC/
BATT
CHGR
GND
FLT
NAC
TRBL
CA
UTI
O
N
HI
G
H
V
O
L
TA
G
E
CA
U
T
IO
N
HI
G
H
V
O
L
TA
G
E
NAC 4 CLASS A
A- A+
NAC 3 CLASS A
A- A+
NAC 2 CLASS A
A- A+
NAC 1 CLASS A
A- A+
SYNC IN -
SYNC IN +
8
9
8
8
9
9
10
11
12
13
14
15
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
0
1
2
3
4
7
6
5
TENS
ONES
ADDRESS
LOOP
Figure 2.6 Power-limited Wiring Example
AC Power
Nonpower-limited
Output Circuits
Power-limited Circuits
Relay Contacts
Nonpower-limited Circuit
Input Circuits
Power-limited Circuit
Specific Application
Power & SLC are
Power-limited Circuits
24f
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