Specifications

Diagrams are for reference only.

Consult the appropriate installation sheet for wiring details.

Notification appliance circuit maximum wire length calculation

Use this worksheet to determine the maximum wire length of a notification appliance

circuit. Fill in one worksheet for each NAC connected to the panel.

Maximum signal loss allowed [1] V

x 1000

Wire resistance per 1000 ft/pair [2] ÷ ohms

Total operating current required [3] ÷ A

Maximum circuit length ft

FireShield maximum wire length calculation notesFireShield maximum wire length calculation notes

FireShield maximum wire length calculation notes

[1] 1.6 V for 230 V at 50 Hz, 1.8 V for 230 V at 60 Hz, 1.9 V for 120 V at 60 Hz

[2] Use wire resistance from Table 1.

[3] Use the

20 Vdc VFWR Average/Mean Operating Current

ratings found on the

installation or catalog sheet of each device.

QuickStart maximum wire length calculation notesQuickStart maximum wire length calculation notes

QuickStart maximum wire length calculation notes

[1] For worst case estimates, assume a 1.5 V line loss and all appliances are clustered

at the end of the circuit.

[2] Use wire resistance from Table 1.

[3] Use the

20 Vdc VFWR Average/Mean Operating Current

ratings found on the

installation or catalog sheet of each device.

EST3 maximum wire length calculation notesEST3 maximum wire length calculation notes

EST3 maximum wire length calculation notes

[1] For worst case estimates, assume a 3.4 V line loss and all appliances are clustered

at the end of the circuit.

[2] Use wire resistance from Table 1.

[3] Use the

20 Vdc Average/Mean Operating Current

ratings found on the

installation or catalog sheet of each device.

24 VDC NAC WIRE LENGTH24 VDC NAC WIRE LENGTH

24 VDC NAC WIRE LENGTH

REFERENCE SECTION