19.3.1 Entry of water into water-related equipment
[Basic requirements]
Water-related equipment shall be constructed in such a way to avoid water from coming into contact with any live parts, in order to prevent smoke emission, ignition, fire and electric shock hazards. Furthermore, the insulating parts adjacent to conductive parts to which hazardous voltages are applied shall have sufficient tracking resistance characteristics, in order to prevent smoke emission, ignition, and fire hazards.
Note: The term "water" refers to conductive liquids (including bubbles, etc.).
[Design standards]
1) The equipment shall be constructed in such a way that water entering from openings or gaps in the equipment, or water inside the equipment, does not come into contact with any live parts.
Note: This also applies to equipment producing vapor, which is expected to encounter abnormal conditions such as the blockage of the blow-out hole, re-inhalation of exhaled vapor, and stoppage of the exhaust fan.
2) Water-related equipment used for cooking purposes which incorporates a sheathed heater, such as rice cookers and electric grills shall be considered to comply with the above requirement in 1), if the equipment passes the water spray test.
3) Water-related equipment which can be immersed in water by mistake, such as handheld electric mixers and electric thermo pots shall be considered to comply with the above requirement in 1), if the equipment passes the immersion test.
4) The insulating parts adjacent to conductive parts to which hazardous voltages are applied shall have sufficient tracking resistance characteristics.
The following structures can be regarded as having sufficient tracking resistance characteristics.
a) The insulating parts on PWB units that are fully sealed with resin that has sufficient tracking resistance.
b) The insulating parts on PWB units that are partially sealed with resin that has sufficient tracking resistance.
Note: If the partial potting complies with ANNEX 3 (Definition of the term "covered by materials"), then it can be regarded as having sufficient tracking resistance characteristics.
c) The insulating parts such as contact components (switches, relays and thermostats), coil parts (feed valves) and PWBs that have sufficient tracking resistance characteristics.
5) Industrial equipment and FA equipment, which comply with the requirements in Article 1.2, shall be considered to be in conformity with this requirement.
[Criteria]
Compliance is determined
1) by conducting the following water spray test used to check for contact with water.
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."
b) Water shall not come into contact with any live parts.
Note: The presence of any trace of splashed water on live parts shall be identified by visual inspection, in addition to the measurement on the change of insulation resistance and the increase of the leakage current between live parts.
2) by conducting the following water spray test used to check for contact with water.