78 XLS140 Installation Manual Form Number 95-7673-3 P/N 51927:C  12/06/2005 
Electrical Specifications Electrical Specifications
Signaling Line Circuit (SLC) 
Notification Appliance Circuits & Releasing Circuits 
Output Relays
Output relays for Alarm, Trouble, Supervisory, and Security are available on power supply 
terminals TB8, TB9, TB10, and TB11 respectively.
Contact ratings: 2.0 A @ 30 VDC (resistive) 
Four-wire Smoke Detector Power
Control Panel terminals TB7 RESET (+) and (–) supply filtered, low-noise power for four-wire 
smoke detectors. Specifications are:
• Nominal voltage: 24 VDC
• Maximum rated current: 1.25 A DC
• Maximum ripple voltage: 176 mVrms
Refer to the Device Compatibility Document for compatible 24 VDC detectors.
Power Output 
Control Panel terminals TB7 NONRST (+) and (–) supply one (1) power-limited circuit available 
to power external devices, such as notification appliances and annunciators.
• Nominal voltage: 24 VDC
• Maximum rated current: 1.25 A DC
• Maximum ripple voltage: 176 mVrms
Refer to the Device Compatibility Document for compatible devices and notification appliances. 
Item Value
Voltage 24 VDC nominal, 27.6 VDC maximum
Maximum length  12,500 ft. (3810 m) per channel (NFPA Style 4) or 10,000 ft. (3048 m) total 
loop or circuit length (NFPA Style 6 and 7)
Note: Refer to Appendix B.2 “Wire Requirements” for limitations. 
Maximum current  400 mA peak, 200 mA average (max short circuit; circuit will shut down until 
short is fixed)
Maximum resistance  50 ohms (supervised and power-limited)
Item Value
Max. wiring voltage drop 2 VDC (except CMX which is 1.2 VDC)
Nominal operating voltage  24 VDC
Current for all external 
devices connected to the 
control panel’s power supply
6.0 A in alarm (3 A continuous)
Optional ACPS-2406  Total 6 A in alarm (5 A continuous)
Optional APS-6R Total 6 A in alarm (4 A continuous)
Maximum signaling current/
circuit per NAC
2.5 A 
Note: Some devices have maximum draws less than this; refer to the device’s 
documentation.
End-of-Line Resistors 
(ELRs)
Control Panel NACs (TB3, TB4, TB5, TB6): 2.2K, 1/2 watt
ICM-4RK, ICE-4, VCM-4RK, VCE-4, and DCM-4RK: 4.7K, 
1/2 watt (2 watts on 70 Vrms audio)
XP6-C, XLS-CM-N/TC810N1013 Modules: 47K, 1/2 watt
NOTE: The Control Panel provides a total of 6.0 A of power in alarm (3 A in standby), shared by 
all internal circuitry and external provisions (24 V resettable and non-resettable). For power 
requirements, refer to the power supply calculation tables in Appendix A.