System Sensor SP2C Series Ceiling Mount Speaker_Strobes User Manual
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.
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
SW
1
INCORRECT
TO NEXT
STROBE OR EOL
INPUT FROM
POWER SUPPLY
INPUT FROM
AMPLIFIER
TO NEXT
SPEAKER OR EOL
STROBE
SPEAKER
Table 1. Sound levels for each transformer
power tap:
D690-02-00
2
I56-1455-009R
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.
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.
Model No.
FWR Max. Operating
Current – Strobe
(mA RMS)
DC Max. Operatng
Current – Strobe
(mA RMS)
SP2C2415
68
64
SP2C241575
77
78
SP2C2430
107
113
SP2C2475
197
205
SP2C2495
239
274
SP2C24115
298
325
SP2C24177
399
489
A0101-00
A0102-00
INPUT
VOLTS
2 W
1 W
1
/
2
W
1
/
4
W
25.0 &
70.7
84
81
78
75
UL
Reverberant
(dBA @ 10 ft.)