UL 1484-2016 pdf download
UL 1484-2016 pdf download.Residential Gas Detectors.
49.8.2.2 The transients produced are to be oscillatory and have an initial peak voltage of 6000 volts. The nse time is to be less than 0.5 microsecond. Succes&ve peaks of transients are to decay to a value ol 50 percent of the preceding peak. Each transient is to have a total duration of 20 microseconds.
49.8.2.3 The gas detector Is to be subjected to 500 oscillatory transient pulses induced at a rate of once every 10 seconds, Each transient pulse is to be induced at a time 90 degrees into the positive half of the 60•hertz cycle. A total of 250 pulses are to be applied so that the polanty of the transients is positive with reference to earth ground, and the remaining 250 pulses are to be negative with respect to earth ground.
49.8.3 Internally induced transients
49.8.3.1 The detector is to be energized in the standby condition while connected to a source of supply as specified in Table 33.1. The supply is to be interrupted for approximately 1 second at a rate of not more than 6 cycles per minute for a total of 500 cycles. A cycle is to consist of 9 seconds of energi.zation and 1 second of de-energization. Following the test. the detector is to be operated for its intended signaling performance.
49.8.4 Extraneous transients
49.8.4.1 A gas detector is to be energized from a source of rated voltage and frequency and subjected to transients generated from the following devices located 1 foot (305 mm) from the detector or interconnecting wires, or both. The time of application for the condition specified in (a) is to be at least 2 minutes. The conditions specified in (c) — (e) are to be applied for 10 cycles, each cycle of 2 seconds duration. For the Condition specified in (b), the 1 foot distance is to be measured from the transmitter-receiver (walkie-talkie or cellular phone) antenna to the surface of the gas detector.
a) Sequential arc (Jacob’s ladder) generated between two 15 inch (381 mm) long, 14 AWG
(2.1 mm2) solid copper conductors attached rigidly in a vertical position to the output terminals of an oil burner ignition transformer or gas tube transformer rated 120 volts. 60 hertz primary. 10,000 volts, 60 hertz, 23 milliamperes secondary. The two wires are to be formed In a taper
starting with a 118 inch (3.2 mm) separation at the bottom (adjacent to terminals) and extending to 1 1/4 inches (31.8 mm) at the top.
b) Energization and transmission of random voice message of three separate transmitter- receiver units (walkie.talkies or cellular phones) in turn, each having a 5•watt output and operating In the following nominal frequencies:
1) 27 megahertz:
2)150 megahertz:
3) 450 megahertz:
4) 866 megahertz: and
5) 910 megahertz.
A total of six energizations are to be applied from each transmitter-receiver: five to consist of 5 seconds on and 5 seconds off, followed by one consisting of a single 15-second energization. For this test, the walkie-talkies or cellular phones are to be in the same room and on the same plane as the gas detector under test.
c) Energization of an electric drill rated 120 volts. 60 hertz, 2.5 amperes.
498.5 Low-voltage wiring transients
49.8.5.1 A gas detectoi having lOW-vOlta9e wiring shall be subjocted to 60 transient voltage pulses. The pulses are to be induced in:
a) A detector circuit intended to be connected to the low-voltage initiating device circuit of a System control unit:
b) A low-voltage power-supply circuit: and
C) A low-voltage signaling circuit.
498.5.2 Each circuit is to be subjected to five different transient wavefornis having peak voltage levels in the range of 100 — 2400 volts, as delivered into a 200 ohm load. A transient waveform at 2400 volts is to have a pulse rise time of 100 volts per microsecond, a pulse duration of approximately 80 microseconds, and an energy level of approximately 1.2 joules Other applied transients are to have peak voltages representative of the entire range of 100 — 2400 volts, with pulse durations from 80 — 1110 microseconds. and energy levels not less than 0.03 joule nor greater than 1.2 joules.
4985.3 The gas detector is to be subjected to 60 transient pulses induced at the rate of six pulses per minute as follows:
a) Twenty pulses (two at each transient voltage level) specified in 49.8.5.2 between each circuit lead or terminal arid earth ground, consisting of ten pulses of one polarity, and ten of the opposite polarity (total of 40 pulses); and
b) Twenty pulses (two at each transient-voltage level) specified in 49.8,5.2 between any two leads or terminals consisting of ten pulses of one polarity and ten of the opposite polarity.
