System Sensor SpectrAlert SP2C Series Installation And Maintenance Instructions page 2

Example: Assume you have 10 devices on a zone and each
requires 50 mA average and 2000 Ft. of 14 AWG wiring
(total length=outgoing+return). The voltage at the end
of the loop is 0.050 amps per device×10 devices×3 ohms
1,000 ft.×2000 ft =3 volts drop.
The same number of devices using 12 AWG wire will produce only
2 volts drop. The same devices using 18 AWG wire will produce
8 volts drop. Consult your panel manufacturer's specifications, as
well as SpectrAlert's operating voltage range to determine accept-
able 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.
Figure 1. Electrical connections:
SPEAKER
INPUT FROM
AMPLIFIER
INPUT FROM
POWER SUPPLY
A0101-00
NOTE: Supply power for strobe must be continuous for
proper operation.
Table 2: Current draw of strobes
NOTE: All 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.
FWR Max. Operating
Current – Strobe
Model No. (mA RMS)
SP2C2415 68
SP2C241575 77
SP2C2430 107
SP2C2475 197
SP2C2495 239
SP2C24115 298
SP2C24177 399
D690-02-00
STROBE
TO NEXT
SPEAKER OR EOL
TO NEXT
STROBE OR EOL
DC Max. Operatng
Current – Strobe
(mA RMS)
64
78
113
205
274
325
489
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Electrical
1. Connect the speaker/strobe as shown in Figure 1. Keep in mind
that even though the speaker and strobe are a single mechani-
cal 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 connection in order to
maintain electrical supervision.
Figure 2. Voltage and Power Selection:
CORRECT
25.0V
70.7V
2W
1W
1/2W
1/4W
A0102-00
Table 1. Sound levels for each transformer
power tap:
INPUT
2 W 1 W
VOLTS
25.0 &
84 81
70.7
2
INCORRECT
25.0V
70.7V
2W
1W
1/2W
1/4W
1 / W 1 / W
UL
2 4
Reverberant
(dBA @ 10 ft.)
78 75
I56-1455-009R