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Installation Power-limited Wiring Requirements
24 MS-2/MS-4 PN 51512:E 01/18/05
2.5 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” (6.35 mm) 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 MS-4 is illustrated below.
ON
1 2 345678
ON
1 2 345678
ON
1 2 345678
SUPERVISORY
SUPERVISORY
SUPERVISORY
SUPERVISORY
TROUBLE
TROUBLE
TROUBLE
TROUBLE
MAINTENANCE
MAINTENANCE
MAINTENANCE
MAINTENANCE
FIRE ALARM
FIRE ALARM
AC
POWER
NAC
DI SABLE
NAC
FA ULT
SYSTEM
TROUBLE
POWER
TROUBLE
WA L K
TEST
ALA RM
SILENCE
ZONE
DI SABLE
FIRE ALARM
FIRE ALARM
RESET
WALK
TEST
ALARM
SILENCE
ACK
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE
ENABLE/DISABLE
3
4
2
1
TB1
TB2
TB3
TB5
TB6
TB7
+ - + -
Nonreset Resettable
C NC NO
ALARM SUPV
C NC NO
J8
J7
J9
TB8
JP1
SW1
BATTERY
HOT NEUT EARTH
TRANSFORMER 1TRANSFORMER 2
SW2 SW3
JP2
EARTHBATTCHG
4XLB
TB1
A+ A- A+ A-
NAC 1 NAC 2
CLASS A CLASS A
A+ A- A+ A-
ZONE 1 ZONE 2
CLASS A CLASS A
A+ A- A+ A-
ZONE 3 ZONE 4
CLASS A CLASS A
SIGNAL TRANSFORMER
XX-XXX-XXXXXX Rev X
SIGNAL TRANSFORMER
XX-XXX-XXXXXX Rev X
Figure 2.9 Typical UL Power-limited Wiring Requirements
Power-limited Circuits
Nonpower-limited Circuits
Power-limited
Circuits
Nonpower-limited
Circuit
AC Power
4XTMF
4XLMF
CAC-4
ms4ulpwr.cdr