24VDCꢀ2-wireꢀhorn/strobeꢀcurrentꢀdrawꢀisꢀshownꢀinꢀTableꢀ
1-C.
3.ꢀ
Currentꢀdrawꢀforꢀotherꢀhorn/strobeꢀpowerꢀsuppliesꢀcanꢀbeꢀ
calculatedꢀbyꢀaddingꢀtheꢀstrobeꢀcurrentꢀinꢀTableꢀ1-Aꢀtoꢀtheꢀ
hornꢀcurrentꢀinꢀTableꢀ1-Bꢀfromꢀtheꢀchosenꢀsettings.
1.ꢀ
2.ꢀ
Currentꢀdrawꢀforꢀstrobe-onlyꢀproductsꢀisꢀshownꢀinꢀTableꢀ1-A.
Electrical Specifications
OperatingꢀVoltage
24ꢀVDCꢀandꢀFWR ꢀunfiltered
OperatingꢀVoltageꢀRange
16–33ꢀV
U.S.ꢀPatentꢀNumbers
6,049,446ꢀ
1
6,057,778ꢀ
D424,465
InputꢀTerminals
12ꢀtoꢀ18ꢀAWG
OperatingꢀVoltageꢀRangeꢀw/Sync•Circuitꢀ
Module
2
17-33ꢀV
Notes:
1.ꢀFullꢀWaveꢀRectifiedꢀ(FWR)ꢀvoltageꢀisꢀaꢀnon-regulated,ꢀtime-varyingꢀpowerꢀsourceꢀthatꢀisꢀusedꢀonꢀsomeꢀpowerꢀsupplyꢀandꢀpanelꢀoutputs.
2.ꢀTheꢀMDLꢀcausesꢀaꢀone-voltꢀvoltageꢀdropꢀinꢀtheꢀnotificationꢀapplianceꢀcircuit.
Table 1-A: SpectrAlert Strobe UL Max. Current Draw (mA RMS) Table 1-B: Horn UL Max. Current Draw Measurements (mA RMS)
16-33V FWR Operating
Current – Strobe
(mA RMS)
16-33V DC Operating
Current – Strobe
(mA RMS)
16-33V (DC)
16-33V (FWR)
Strobe
Setting
Temporal
Low
Volume
Electromechanical
3000ꢀHzꢀInterrupted
Electromechanical
3000ꢀHzꢀInterrupted
Electromechanical
3000ꢀHzꢀInterrupted
Electromechanical
3000ꢀHzꢀInterrupted
23
33
53
57
37
32
49
56
23
23
44
40
29
33
49
58
15
15/75
30
68
64
High
Volume
77
78
107
197
239
298
399
113
205
274
325
489
Non-
Temporal
Low
Volume
75
95
High
Volume
115
177
Table 1-C: 24V DC Horn/Strobe UL Max. Current Draw Measurements (mA RMS)
Temporal
Non-Temporal
Low Volume
Electromechanical
High Volume
Electromechanical
Low Volume
High Volume
Candela Setting
3000 Hz
73
3000 Hz
78
Electromechanical
3000 Hz
75
Electromechanical
3000 Hz
86
15
15/75
30
73
76
75
81
89
89
91
92
89
90
96
98
126
225
272
297
512
125
222
270
297
504
128
222
271
296
501
128
222
271
296
496
125
219
266
291
491
125
219
265
290
493
131
221
269
292
491
134
222
270
293
496
75
95
115
177
Explanation of Published Voltage, Current, and SPL Specifications
In May 2004 Underwriters Laboratories changed standard During May 2004, UL also changed the way they list the
UL 1971 to require that operating current measuremments voltage range of a device. All 12V products will be listed
are made using RMS (root mean square) instead of peak between 8 – 17.5V and all 24V products will be listed
or average values. RMS measurements more accurately between 16 – 33V. Those devices are considered “regulat-
predict the power consumption of a device since they take ed”. Any product that does not operate within these ranges
into account the entire current draw profile including surge, will be listed as a “special application” with its operating
repetitive surge, and peak values. The published RMS cur- voltage specified on the device.
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.
Notes
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.
SYSTEMSENSOR [ SYSTEMSENSOR ADVANCED IDEAS. ]
