This section contains amplifier field wiring guidelines and illustrations, including speaker circuit wiring distances. The information covers all types of
wiring, with and without backup amplifiers, NAC expansion modules, Constant Supervision NAC (CSNAC) modules, and Class A adapters.
Note: TrueAlert ES speaker appliances have a maximum wire length. Refer to the Speaker Wiring Application. Guidelines in the ES-PS IDNAC Card
Installation Instructions, 579-1289.
Note: "Applied Power" is the total amplifier power available to the speaker circuit. Applied power is consumed by speakers and wiring losses. "Actual
Power" is the speaker power available over the maximum distance designated for each wire size. Complying with the wire sizes and associated
distances specified will ensure no more than a 3dB wiring power loss to the end of the speaker circuit.
Power (Watts)
VRMS
Applied
Actual
25
50
25
25
40
20
25
30
15
25
20
10
25
10
5
70
100
50
70
80
40
70
70
35
70
60
30
70
50
25
70
40
20
70
30
15
70
20
10
70
10
5
Power (Watts)
VRMS
Applied
Actual
25
50
25
25
40
20
25
30
15
25
20
10
25
10
5
70
100
50
70
80
40
70
70
35
70
60
30
70
50
25
70
40
20
70
30
15
70
20
10
70
10
5
* Wiring distances affected by capacitance of speaker circuit wiring if using CSNAC. See notes in Figure 9.
page 8
Table 2: Class A Speaker Circuit Wiring Distances for 100W Amplifiers*
Distance to the Last Speaker (One Way) (Feet/Meters)
2
12 AWG (3.309 mm
)
812 ft. (247 m)
1,015 ft. (309 m)
1,350 ft. (411 m)
2,035 ft. (620 m)
4,070 ft. (1,241 m)
3,250 ft. (991 m)
4,060 ft. (1,237 m)
4,959 ft. (1,511 m)
5,430 ft. (1,655 m)
6,500 ft. (1,981 m)
8,121 ft. (2,475 m)
10,860 ft. (3,310 m)
16,212 ft. (4,941 m)
32,400 ft. (9,876 m)
Table 3: Class B Speaker Circuit Wiring Distances for 100W Amplifiers*
Distance to the Last Speaker (One Way) (Feet/Meters)
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