Instruction manual

P83601 F
Sheet 4 of 11
Table 3A: Horn Current Ratings (AMPS) for Wall Models
High dBA
Voltage NS4-2415W NS4-241575W NS4-2430W NS4-2475W NS4-24110W
20.0VDC 0.024 0.024 0.024 0.024 0.024
24.0VDC 0.028 0.028 0.028 0.028 0.028
31.0VDC 0.036 0.036 0.036 0.036 0.036
20.0VRMS 0.034 0.034 0.034 0.034 0.034
24.0VRMS 0.044 0.044 0.044 0.044 0.044
31.0VRMS 0.057 0.057 0.057 0.057 0.057
Voltage NS4-1215W NS4-121575W ------ ------ ------
10.5VDC 0.014 0.014 ------ ------ ------
12.0VDC 0.015 0.015 ------ ------ ------
15.6VDC 0.021 0.021 ------ ------ ------
10.5VRMS 0.021 0.021 ------ ------ ------
12.0 VRMS 0.025 0.025 ------ ------ ------
15.6 VRMS 0.030 0.030 ------ ------ ------
Low dBA
Voltage NS4-2415W NS4-241575W NS4-2430W NS4-2475W NS4-24110W
20.0VDC 0.017 0.017 0.017 0.017 0.017
24.0VDC 0.022 0.022 0.022 0.022 0.022
31.0VDC 0.027 0.027 0.027 0.027 0.027
20.0VRMS 0.022 0.022 0.022 0.022 0.022
24.0VRMS 0.033 0.033 0.033 0.033 0.033
31.0VRMS 0.043 0.043 0.043 0.043 0.043
Voltage NS4-1215W NS4-121575W ------ ------ ------
10.5VDC 0.008 0.008 ------ ------ ------
12.0VDC 0.009 0.009 ------ ------ ------
15.6VDC 0.011 0.011 ------ ------ ------
10.5VRMS 0.010 0.010 ------ ------ ------
12.0 VRMS 0.011 0.011 ------ ------ ------
15.6 VRMS 0.015 0.015 ------ ------ ------
WARNING: MAKE SURE THAT THE TOTAL AVERAGE CURRENT, TOTAL PEAK CURRENT AND TOTAL
INRUSH CURRENT REQUIRED BY ALL APPLIANCES THAT ARE CONNECTED TO THE SYSTEM’S PRIMARY
AND SECONDARY POWER SOURCES, SIGNALING CIRCUITS, SM AND DSM SYNC MODULES DO NOT EXCEED
THE POWER SOURCES’ RATED CAPACITY OR THE CURRENT RATINGS OF ANY FUSES ON THE CIRCUITS TO
WHICH THESE APPLIANCES ARE WIRED. OVERLOADING POWER SOURCES OR EXCEEDING FUSE RATINGS
COULD RESULT IN LOSS OF POWER AND FAILURE TO ALERT OCCUPANTS DURING AN EMERGENCY, WHICH
COULD RESULT IN PROPERTY DAMAGE AND SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.
When calculating the total average, peak and inrush currents: Use Table 3 and 3A to determine the highest value of “Rated Average
Current” for an individual strobe (across the expected operating voltage range of the strobe), and use Table 3 to determine the highest
value of “Rated Inrush Current” or “Rated Peak Current” (whichever is higher) of an individual strobe (across the expected voltage
range of the strobe), then multiply these values by the total number of strobes; be sure to add the currents for any other appliances,
including audible signaling appliances, powered by the same source and include any required safety factors.
If the inrush current or peak current exceeds the power supplies’ inrush capacity, the output voltage provided by the power supplies
may drop below the listed voltage range of the appliances connected to the supply and the voltage may not recover in some types of
power supplies. For example, an auxiliary power supply that lacks filtering at its output stage (either via lack of capacitance and/or
lack of battery backup across the output) may exhibit this characteristic.
CAUTION: Series NS4 are not designed to be used on coded systems in which the applied voltage is cycled on and off.