a) Water shall be sprayed by taking the actual use of the equipment under consideration according to the following "Water spray methods used to check for contact with water." The insulation resistance of the equipment shall be measured two minutes after the test.
b) The insulation resistance of the equipment shall be at least 1 M.
3) by conducting the following immersion test.
a) During the immersion test, the equipment shall be immersed in water to simulate such a state during actual use. After drawing the equipment out of the water, the water shall be drained and the droplets of water on the surfaces of the equipment shall be wiped off. Two minutes later, the insulation resistance shall be measured.
b) The insulation resistance of the equipment shall be at least 1 M.
4) by conducting the following tracking resistance test.
Criterion: No ignition shall occur up to 200 drops.
Test sample: The insulating parts adjacent to conductive parts to which hazardous voltages are applied in actual equipment under actual operating conditions
Test liquid: An aqueous solution (whose water is either distilled water or ion-exchanged water) of ammonium chloride with a 0.2% concentration (NH4Cl which meets the standard for reagent class 1)
Voltage: The rated voltage
Amount of liquid dripped: 20 mm3 per drop
Drip height: 30 to 40 mm
Drip interval: 30 ±5 sec.
If scintillation exceeds the drip interval, the dripping shall be temporarily suspended until the scintillation subsides, after which the dripping shall be resumed.
Note1: If non-resetting protective devices in actual equipment operate before igniting, then the test can be regarded as being conformant and the test can therefore be concluded. However, if protective devices that are not of the non-resetting type operate, then the test shall be resumed and continued until 200 drops are applied after the protective devices are reset.
Note2: If it is impossible to apply the drops to the target insulating parts adjacent to conductive parts in actual equipment, then the test shall be conducted by taking out the parts.
In this case, test liquid may be dripped onto the insulating parts in the same position as actual equipment.
Note3: Whenever the test liquid is dripped, currents must flow between conductive parts through an aqueous solution of ammonium chloride, unless currents cannot physically flow between conductive parts through an aqueous solution of ammonium chloride because distances through the insulation between conductive parts is too long or there is a partition between conductive parts. Note4: In the case of the conductive parts on a PWB, only the conductive part under the worst conditions among them may be tested. The following are cases where conductive parts are under the worst condition.
a) Conductive parts most unfavorable in the relationship between the voltage and insulation distance
b) Conductive parts presumed to accumulate a lot of dust, such as near the fresh-air intake of a cooling fan
4-a) Compliance is determined on the basis of Level I in PCSS-Q-07003 "Moisture resistance