System Sensor SP2C User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

SpectrAlert SP2C Series
Ceiling Mount Speaker/Strobes for

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

Fire Protective Signaling Systems

For use with the following models: SP2C2415, SP2C241575, SP2C2430,
SP2C2475, SP2C2495, SP2C24115, SP2C24177
U.S. Patent Nos. 5,850,178; 5,598,139; 6,049,446; 6,057,778; D424465; 5,931,569; 6,623,143

Specifications:

Mechanical

Input Terminals: 12 to 18 AWG (3.31 to 0.82 mm
Speaker Size: 4 inches (101 mm)
Overall Dimensions: 6.8

Electrical

Maximum Supervisory
Voltage (Speaker): 50 VDC
Operational Humidity Range: 10 – 93% RH (non-condensing)

For Strobes

Voltage: Regulated 24 DC/FWR
Operational Voltage Range: 16–33 Volts
Synchronous Applications
with MDL Module: 17–33 Volts

NOTE: The SP2C Series is suitable for dry and humid environments. Not suitable for use in air handling spaces.
Note for Strobes – Do not exceed: 1) 16-33 Voltage range limit; 2) Maximum number of 70 strobe lights when connecting the MDL
Sync module with a maximum line impedance of 4 Ohms per loop and: 3) Maximum line impedance as required by the fire alarm
control manufacturer.

˝ diameter (173 mm)

2

Flash Rate: 1 Flash Per Second

)

Light Output: Models with 15 only in the model number are

listed at 15 candela.

Models with 1575 in the model number are

listed at 15 candela per UL 1971 but will pro
vide 75 candela on axis (straight down).

Models with 30, 75, 95, 115, 177 are for that

candela.

Sound Output: Sound output levels are established at

Underwriters Laboratories in their reverberant
room.

Always use the sound output specified as UL

Reverberant Room when comparing products.

Listings: UL S5512 Strobe, UL S4048 (Speaker/Strobe)

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NOTICE: This manual shall be left with the owner/user of this
equipment.

General Description

The National Fire Protection Association (NFPA) has published
standards and recommended practices for the speaker/strobes
described in this manual. As a result, the installer must be famil
iar with these requirements as well as all local codes and special
requirements of the authority having jurisdiction.

The SpectrAlert SP2C series ceiling mount speaker/strobe can be
operated with distribution amplifiers having an output voltage of
either 25 volts or 70.7 volts.

The speakers operate at any one of four input power levels. The
output sound level is selected at the time of installation, but can
be changed, if necessary.

The speaker is also equipped with a capacitive input to allow for
DC supervision.

The SpectrAlert SP2C series ceiling mount strobe can be installed
in systems using 24-volt panels having DC or full-wave rectified
(FWR) power supplies. The strobes can also be installed in appli
cations requiring synchronization (MDL required) or applications
that do not require synchronization (no module required).

The SpectrAlert SP2C series ceiling mount speaker/strobes are
designed to meet the requirements of most agencies governing
these devices, including: NFPA, The National Fire Alarm Code,
UL, CSFM, MEA. Also, check with your local Authority Having
Jurisdiction for other codes or standards that may apply.

Power Supply Considerations For Strobes

Panels typically supply DC filtered voltage or FWR (full­wave rectified) voltage. The system design engineer must cal
culate the number of units used in a zone based on the
type of panel supply. Be certain the sum of all the device currents
do not exceed the current capability of the panel. Calculations are
based on using the device current found in Table 2 and must be

­the current specified for the type of panel power supply used.

Wire Sizes

The designer must be sure that the last device on the circuit has
sufficient voltage to operate the device within its rated voltage.
When calculating the voltage available to the last device, it is
necessary to consider the voltage drop due to the resistance of the
wire. The thicker the wire, the less the voltage drop. Generally, for
purposes of determining the wire size necessary for the system,
it is best to consider all of the devices as “lumped” on the end of
the supply circuit (simulates “worst case”).

Typical wire size resistance:
18 AWG solid: Approximately 8 ohms/1,000 ft.
16 AWG solid: Approximately 5 ohms/1,000 ft.

­14 AWG solid: Approximately 3 ohms/1,000 ft.

12 AWG solid: Approximately 2 ohms/1,000 ft.

Note: If class “A” wiring is installed, the wire length may be up to
4 times the single wire length in this calculation.

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D690-02-00 1 I56-1455-009R

Example: Assume you have 10 devices on a zone and each

25.0V

70.7V

2W

1W

1/2W

1/4W

25.0V

70.7V

2W

1W

1/2W

1/4W

CORRECT

SW1

SW1

INCORRECT

TO NEXT
STROBE OR EOL

INPUT FROM
POWER SUPPLY

INPUT FROM
AMPLIFIER

TO NEXT
SPEAKER OR EOL

STROBESPEAKER

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
1,000 ft.

×2000 ft =3 volts drop.

×10 devices×3 ohms

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:

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.

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Figure 2. Voltage and Power Selection:

A0102-00

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Table 1. Sound levels for each transformer
power tap:

A0101-00

NOTE: Supply power for strobe must be continuous for

proper operation.

INPUT

VOLTS

25.0 &

70.7

2 W 1 W1/2 W1/4 W

84 81 78 75

(dBA @ 10 ft.)

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 64

SP2C241575 77 78

SP2C2430 107 113

SP2C2475 197 205

SP2C2495 239 274

SP2C24115 298 325

SP2C24177 399 489

D690-02-00 2 I56-1455-009R

DC Max. Operatng

Current – Strobe

(mA RMS)

UL

Reverberant