SilentKnight SKE-450 Voice Evacuation Control Panel - Manual (Page 21)

Installation
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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
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.
Table 3-7
Number Of Speakers Total Load Wire Distance in Feet
@1/2 W @1 W Vrms Watts 18 AWG 16 AWG 14 AWG 12 AWG
10 5
25Vrms
5W
3900 6200 9860 15680
70Vrms 25000 39700 63200 100520
20 10
25Vrms
10W
2125 3380 5375 8540
70Vrms 15200 24150 38400 61100
30 15
25Vrms
15W
1460 2320 3690 5870
70Vrms 11000 17500 27800 44200
40 20
25Vrms
20W
1100 1750 2780 4420
70Vrms 8500 13510 21500 34175
52 26
25Vrms
26W
760 1200 1920 3050
70Vrms 6100 9700 15400 24520
80 40
25Vrms
40W
550 875 1390 2200
70Vrms 4100 6500 10360 16480
100 50
25Vrms
50W
450 715 1130 1800
70Vrms 3500 5560 8850 14070