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3.6
Speaker Wiring
Each SKE-450 supplies one NAC (Notification Appliance Circuit) for speaker connection.
The speaker circuit can be supervised and wired Class B (Style Y) or Class A (Style Z). The
speaker circuit is capable of 50 watts of power at 25 Vrms or 70.7 Vrms (using the SKE-V70
Module, see Section 8 for SKE-V70 installing instructions).
Note: If the SKE-V70 Module is installed, all speaker wiring must be separated by a minimum of 1/4" from the
low voltage wiring, and must exit the cabinet through its own opening.
3.6.1
Wiring Lengths
Number Of Speakers
@1/2 W
@1 W
10
5
20
10
30
15
40
20
52
26
80
40
100
50
Note: The above table assumes a uniform distribution of the speakers, and that a max of 20% voltage drop on the
last speaker is allowed.
151267
Table 3-7
Total Load
Vrms
Watts
18 AWG
25Vrms
3900
5W
70Vrms
25000
25Vrms
2125
10W
70Vrms
15200
25Vrms
1460
15W
70Vrms
11000
25Vrms
1100
20W
70Vrms
8500
25Vrms
760
26W
70Vrms
6100
25Vrms
550
40W
70Vrms
4100
25Vrms
450
50W
70Vrms
3500
firealarmresources.com
Wire Distance in Feet
16 AWG
14 AWG
6200
9860
39700
63200
3380
5375
24150
38400
2320
3690
17500
27800
1750
2780
13510
21500
1200
1920
9700
15400
875
1390
6500
10360
715
1130
5560
8850
Installation
12 AWG
15680
100520
8540
61100
5870
44200
4420
34175
3050
24520
2200
16480
1800
14070
3-11
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