UL 22:2008 pdf download – Amusement and Gaming Machines
UL 22:2008 pdf download – Amusement and Gaming Machines.
36.13 An appliance that is provided with internal or external receptacle connectors for the installation of accessories Is to be subjected to the normal temperature test with such connectors loaded to their maximum rated output,
36.14 The test Is to be conducted simulating the most severe installation the construction permits. Installation in an alcove, in a right-angle corner of a room, or against a wall is to be simulated it the appliance lends itself to such placement.
36.15 The temperature test for an amusement ride is to consist of continuous operation with a 1 50-pound load, applied in such a position so as to simulate as nearly as possible the load imposed by the human body, until constant temperatures are attained.
37 Dielectric Voltage-Withstand Test
37.1 PrImary circuIts
37.1.1 An appliance shall withstand for 1 minute without breakdown the application of an essentially sinusoidal potential at a frequency within the range of 40 — 70 hertz with the appliance at the maximum operating temperature reached in normal use:
a) Successively applied between each diflerent type of primary circuit and earth ground (dead metal parts) with all other primary circuits connected to the earth ground.
b) Applied between any live or current-carrying part of the primary circuit of an isolating-type power transformer and each secondary circuit of that transformer.
C) Applied between terminals of opposite polarity on capacitors that are connected across the line.
37.1.2 The test potential is to be:
a) One thousand volts for an appliance using a motor rated I horsepower (373 W output) or less and 250 volts or less or
b) One thousand volts plus twice the rated voltage for an appliance using a motor rated more than 112 horsepower or more than 250 volts, or an appliance applied directly to persons. A handle. joystick, or an appliance that persons may ride are not considered to be applied directly to persons.
37.1.3 II an autotransformer is in the circuit, an essentially sinusoidal potential 011250 volts plus twice the rated voltage at a frequency in the range of 40 — 70 hertz is to be applied to all wiring involving more than 250 volts.
37.1.4 The primary of the autotransformer is to be disconnected arid the test potential is to be applied directly to the wiring that involves the higher potentials.
Exception: Circuits derived from isoJation transformers that are powered by a secondary circuit that does not involve a risk of electric shock need not be tested.
373.2 The test potential may be obtained from any convenient source having a capacity to maintain the potential indicated in Table 37.1. except in case of beakdown. The output voltage of the test apparatus is to be monitored. Starting at zero, the applied potential is to be increased at a rate of approximately 200 volts per second until the required test value is reached and is to be held at that value for 1 minute. A DC source or an AC source with a peak value equal to the DC value may be used for testing a DC circuit.
37.3.3 Printed-wirIng assemblies and other electronic circuit components that would be damaged by application of the test potential or that would short-circuit the test potential are to be removed, disconnected, or otherwise rendered inoperative before the dielectric voltage-withstand tests are conducted. A representative subassembly may be tested instead of an entire appliance. Rectifier diodes in the power supply may be individuaJly shunted before the test is conducted to avoid destroying them in the case of a malfunction elsewhere in the secondary circuit.
37.4 Induced potential
37.4.1 When at operating temperature, each power transformer shall operate without breakdown while a potential indicated in Table 37.1 is induced for 1 minute in each secondary winding that furnishes power at a higher potential than the primary windings.
Exception. A winding of a transformer that does riot seive a prime power-supply function (such as a resonant winding of a constant-voltage transformer) need not be subjected to this test.
37,4.2 An essentially sinusoidal source is to be used. and the frequency of the source may be in the range of 180 — 1000 hertz if necessary to prevent saturation of the core.
37.4.3 Primary- and secondary-circuit wiring connected to a transformer Is to be disconnected for the test mentioned in 37.4.1.