Amplifier Field Wiring
Overview
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.
Table 2: Class A Speaker Circuit Wiring Distances for 100W Amplifiers*
Power (Watts)
Distance to the Last Speaker (One Way) (Feet/Meters)
VRMS
Applied
Actual
12 AWG (3.309 mm
2
)
14 AWG (2.081 mm
2
)
16 AWG (1.309 mm
2
)
18 AWG (0.8231 mm
2
)
25
50
25
812 ft. (247 m)
510 ft. (155 m)
340 ft. (104 m)
200 ft. (61 m)
25
40
20
1,015 ft. (309 m)
640 ft. (195 m)
402 ft. (123 m)
252 ft. (77 m)
25
30
15
1,350 ft. (411 m)
850 ft. (259 m)
535 ft. (163 m)
337 ft. (103 m)
25
20
10
2,035 ft. (620 m)
1,250 ft. (381 m)
804 ft. (245 m)
505 ft. (154 m)
25
10
5
4,070 ft. (1,241 m)
2,600 ft. (792 m)
1,600 ft. (488 m)
1,012 ft. (308 m)
70
100
50
3,250 ft. (991 m)
2,049 ft. (625 m)
1,288 ft. (393 m)
810 ft. (247 m)
70
80
40
4,060 ft. (1,237 m)
2,554 ft. (778 m)
1,600 ft. (488 m)
1,010 ft. (308 m)
70
70
35
4,959 ft. (1,511 m)
2,930 ft. (893 m)
1,820 ft. (555 m)
1,158 ft. (353 m)
70
60
30
5,430 ft. (1,655 m)
3,400 ft. (1,036 m)
2,138 ft. (652 m)
1,350 ft. (411 m)
70
50
25
6,500 ft. (1,981 m)
4,096 ft. (1,248 m)
2,578 ft. (786 m)
1,620 ft. (494 m)
70
40
20
8,121 ft. (2,475 m)
5,108 ft. (1,557 m)
3,212 ft. (979 m)
2,020 ft. (616 m)
70
30
15
10,860 ft. (3,310 m)
6,800 ft. (2,073 m)
4,270 ft. (1,301 m)
2,689 ft. (820 m)
70
20
10
16,212 ft. (4,941 m)
10,190 ft. (3,106 m)
6,400 ft. (1,951 m)
4,030 ft. (1,228 m)
70
10
5
32,400 ft. (9,876 m)
20,000 ft. (6,096 m)
12,500 ft. (3,810 m)
8,000 ft. (2,438 m)
Table 3: Class B Speaker Circuit Wiring Distances for 100W Amplifiers*
Power (Watts)
Distance to the Last Speaker (One Way) (Feet/Meters)
VRMS
Applied
Actual
12 AWG (3.309 mm
2
)
14 AWG (2.081 mm
2
)
16 AWG (1.309 mm
2
)
18 AWG (0.8231 mm
2
)
25
50
25
1,624 ft. (495 m)
1,021 ft. (311 m)
680 ft. (207 m)
400 ft. (122 m)
25
40
20
2,033 ft. (620 m)
1,279 ft. (390 m)
804 ft. (245 m)
505 ft. (154 m)
25
30
15
2,707 ft. (825 m)
1,704 ft. (519 m)
1,070 ft. (326 m)
673 ft. (205 m)
25
20
10
4,067 ft. (1,240 m)
2,558 ft. (780 m)
1,608 ft. (490 m)
1,011 ft. (308 m)
25
10
5
8,140 ft. (2,481 m)
5,120 ft. (1,561 m)
3,219 ft. (981 m)
2,024 ft. (617 m)
70
100
50
6,500 ft. (1,981 m)
4,098 ft. (1,249 m)
2,577 ft. (785 m)
1,620 ft. (494 m)
70
80
40
8,121 ft. (2,475 m)
5,108 ft. (1,557 m)
3,212 ft. (979 m)
2,020 ft. (616 m)
70
70
35
9,918 ft. (3,023 m)
5,860 ft. (1,786 m)
3,685 ft. (1,123 m)
2,317 ft. (706 m)
70
60
30
10,860 ft. (3,310 m)
6,800 ft. (2,073 m)
4,276 ft. (1,303 m)
2,700 ft. (823 m)
70
50
25
13,000 ft. (3,962 m)
8,197 ft. (2,498 m)
5,154 ft. (1,571 m)
3,241 ft. (988 m)
70
40
20
16,243 ft. (4,951 m)
10,216 ft. (3,114 m)
6,424 ft. (1,958 m)
4,040 ft. (1,231 m)
70
30
15
21,721 ft. (6,621 m)
13,602 ft. (4,146 m)
8,553 ft. (2,607 m)
5,379 ft. (1,640 m)
70
20
10
32,424 ft. (9,883 m)
20,394 ft. (6,216 m)
12,823 ft. (3,908 m)
8,065 ft. (2,458 m)
70
10
5
64,800 ft. (19,751 m)
40,000 ft. (12,192 m)
25,000 ft. (7,620 m)
16,000 ft. (4,877 m)
* Wiring distances affected by capacitance of speaker circuit wiring if using CSNAC. See notes in Figure 9.
page 8
579-174 Rev. Q
Digital/Analog Amplifiers Installation Instructions
