Example: Assume you have 10 devices on a zone and each
requires 50 mA average and 2000 Ft. of 14 AWG wiring
(total length=oureturn). The voltage at the end
of the loop is 0.050 amps per device x 10 devices x 3 ohms
1,000 ft. x 2000 ft =3 volts drop.
The same number of devices using 12 AWG wire will pro-
duce only 2 volts drop. The same devices using 18 AWG
wire will produce 8 volts drop. Consult your panel manu-
facturer’s specifications, as well as SpectrAlert’s operating
voltage range to determine acceptable voltage drop.
Installation
All wiring must be installed in compliance with the
National Electrical Code (NEC) and applicable local codes
as well as special requirements of the authority having
jurisdiction, using the proper wire size. This also includes
all applicable NFPA Standards, ANSI/UL 1480, UL 1971 and
NEC 760.
NOTE:
Supply power for strobe must be continuous for
proper operation.
Figure 1. Electrical connections:
Figure 2. Voltage and Power Selection:
25.0V
70.7V
2W
1W
1/2W
1/4W
25.0V
70.7V
2W
1W
1/2W
1/4W
CORRECT
SW1
SW1
INCORRECT
INPUT FROM
AMPLIFIER
TO NEXT
SPEAKER OR EOL
TO NEXT
STROBE OR EOL
INPUT FROM
POWER SUPPLY
Table 1. Sound levels for each transformer
power tap:
Table 2. Current draw of strobes:
NOTE:
The SP2C24177 strobes were only tested at the 20-33 Volt-FWR limits and 16-33 Volt DC limits, all other SP2C
strobes were only tested at the 16-33 Volt-FWR/DC limits. This does not include the 80% low end or 110% high
end voltage limits.
D690-02-00
2
I56-1455-004R
Average Mean Method:
Average RMS Method:
Electrical
1. Connect the speaker/strobe as shown in Figure 1. Keep
in mind that even though the speaker and strobe are a
single mechanical unit, they are electrically independent
and require separate power sources.
NOTE:
Do NOT loop electrical wiring under terminal
screws. Wires connecting the device to the control
panel must be broken at the device terminal con-
nection in order to maintain electrical supervision.
2W
1W
1/2W
1/4W
84
81
78
75
UL
Reverberant
(dBA @ 10 ft.)
Anechoic
(dBA @ 10 ft.)
2W
1W
1/2W
1/4W
87
84
81
78
DC
FWR FWR
DC
FWR
DC
FWR
78
81
48
55
41
51
81
94
56
62
47
62
114
91
68
79
56
73
179 179
127 140 101 126
223 227
153 173 122 163
290 232
191 230 156 212
453
338 291 300 208 241
15
15/75
30
75
95
115
177
Average Mean Current (mA)
24V Models
16V
24V
33V
DC
FWR FWR
DC
FWR
DC
FWR
164 232 170 242 170 224
174 238
172 258 168 228
238 288
226 318 218 298
418 436
398 462 384 486
540 562
534 560 518 552
644 668
612 712 576 728
952
1092 912 1104 872 1184
Peak Current (mA)
DC
FWR FWR
DC
FWR
DC
FWR
91 118
133 177 188 252
91 115
134 179 182 237
94
116
137 179 184
244
99
118
133 177 186
238
92
115
132 176 187
244
81
108
118 175 174
249
79
148 126 170 171
234
In Rush Current (mA)
Candela
20V
24V Models
16V
24V
33V
20V
24V Models
16V
24V
33V
20V
DC
FWR FWR
DC
FWR
DC
FWR
74
71
61
74
54
74
86
81
71
81
62
86
112 103
90
98
78
99
209 178
167 168 143 154
269 242
213 208 180 204
336 300
257 268 218 248
521
412 394 370 315 327
15
15/75
30
75
95
115
177
Average RMS Current (mA)
24V Models
16V
24V
33V
Candela
20V
