Specifications

ManualsBrandsEnvoy ManualsFire Alarms1-4 Zone Conventional Fire Alarm Control Panels

Diagrams are for reference only.

Consult the appropriate installation sheet for wiring details.

REFERENCE SECTION

24 VDC NAC WIRE LENGTH24 VDC NAC WIRE LENGTH

24 VDC NAC WIRE LENGTH

FireShield voltage drop calculation notesFireShield voltage drop calculation notes

FireShield voltage drop calculation notes

[1] Use wire resistance from Table 1.

[2] Use the

20 Vdc VFWR Average/Mean Operating Current

ratings found on the

installation or catalog sheet of each device.

[3] Cannot drop below 17 Vdc.

[4] 18.6 V for 230 V at 50 Hz, 18.8 V for 230 V at 60 Hz, 18.9 V for 120 V at 60 Hz

QuickStart voltage drop calculation notesQuickStart voltage drop calculation notes

QuickStart voltage drop calculation notes

[1] Use wire resistance from Table 1.

[2] Use the

20 Vdc VFWR Average/Mean Operating Current

ratings found on the

installation or catalog sheet of each device.

[3] Cannot drop below 17 Vdc.

[4] 17.5 Vdc

EST3 voltage drop calculation notesEST3 voltage drop calculation notes

EST3 voltage drop calculation notes

[1] Use wire resistance from Table 1.

[2] Use the

20 Vdc Average/Mean Operating Current

ratings found on the

installation or catalog sheet of each device.

[3] Cannot drop below 17 Vdc.

[4] 21.4 Vdc

Note:Note:

Note: Due to expected changes by UL the calculations on these two pages and the

load currents for all audio and visual devices are expected to be revised by the end of

2005.

NAC Voltage Drop Calculations

Notification appliance circuit voltage drop calculation

Circuit length Total circuit current [2]

Wire resistance

per 1000 ft [1]

Voltage drop

feet x amps x Ohms ÷ 1000 =

Panel

voltage

Voltage

drop

End of line

voltage [3]

Voltage

drop

Panel

voltage

Voltage

drop %

[4] - = ÷ [4] =