Electrical Specifications

OperatingVoltage

InputTerminals

12to18AWG

OperatingVoltageRange

16–33V

OperatingVoltageRangew/Sync•Circuit

17-33V

U.S.PatentNumbers

6,049,446

6,057,778

D424,465

Table 1-A: SpectrAlert Strobe UL Max. Current Draw (mA RMS)

Strobe

Setting

16-33V FWR Operating

Current – Strobe

(mA RMS)

16-33V DC Operating

Current – Strobe

(mA RMS)

15

68

64

15/75

77

78

30

107

113

75

197

205

95

239

274

115

298

325

177

399

489

Table 1-B: Horn UL Max. Current Draw Measurements (mA RMS)

16-33V (DC)

16-33V (FWR)

Temporal

Low

Volume

Electromechanical

23

23

3000HzInterrupted

33

23

High

Volume

Electromechanical

53

44

3000HzInterrupted

57

40

Non-

Temporal

Low

Volume

Electromechanical

37

29

3000HzInterrupted

32

33

High

Volume

Electromechanical

49

49

3000HzInterrupted

56

58

Notes:

1.FullWaveRectified(FWR)voltageisanon-regulated,time-varyingpowersourcethatisusedonsomepowersupplyandpaneloutputs.

2.TheMDLcausesaone-voltvoltagedropinthenotificationappliancecircuit.

Table 1-C: 24V DC Horn/Strobe UL Max. Current Draw Measurements (mA RMS)

Temporal

Non-Temporal

Low Volume

High Volume

Low Volume

High Volume

Candela Setting

Electromechanical

3000 Hz

Electromechanical

3000 Hz

Electromechanical

3000 Hz

Electromechanical

3000 Hz

15

73

73

76

78

75

75

81

86

15/75

89

89

91

92

89

90

96

98

30

126

125

128

128

125

125

131

134

75

225

222

222

222

219

219

221

222

95

272

270

271

271

266

265

269

270

115

297

297

296

296

291

290

292

293

177

512

504

501

496

491

493

491

496

Explanation of Published Voltage, Current, and SPL Specifications

During May 2004, UL also changed the way they list the

voltage range of a device. All 12V products will be listed

between 8 – 17.5V and all 24V products will be listed

between 16 – 33V. Those devices are considered “regulat-

ed”. Any product that does not operate within these ranges

will be listed as a “special application” with its operating

voltage specified on the device.

Notes

1.Currentdrawforstrobe-onlyproductsisshowninTable1-A.

2.24VDC2-wirehorn/strobecurrentdrawisshowninTable

1-C.

3.Currentdrawforotherhorn/strobepowersuppliescanbe

calculatedbyaddingthestrobecurrentinTable1-Atothe

horncurrentinTable1-Bfromthechosensettings.

In May 2004 Underwriters Laboratories changed standard

UL 1971 to require that operating current measuremments

are made using RMS (root mean square) instead of peak

or average values. RMS measurements more accurately

predict the power consumption of a device since they take

into account the entire current draw profile including surge,

repetitive surge, and peak values. The published RMS cur-

rent is the maximum operating current of that device within

its operating voltage range. This current maximum may or

may not occur at the endpoints of the voltage range.

Similarly, UL tests the audibility of devices in accordance

with UL 464 by measuring them across the operating volt-

age range to determine the minimum sound pressure level

produced at any particular setting.