How To Classify Household Appliances
Household appliances are classified according to safety standards, and the national safety requirements for commonly used appliances are divided into five categories: Class 0, Class 01, Class I, Class II, and Class III.
Class 0: This type of electrical appliance only relies on working insulation to isolate the live parts from the casing, without grounding requirements. This type of electrical appliance is mainly used in places that people cannot reach, such as rectifiers for fluorescent lamps. So the safety requirements for such appliances are not high.
Class 01: This type of electrical appliance has working insulation and a grounding terminal that can be used with or without grounding. When used in dry environments (indoor with wooden flooring), it can be left ungrounded, otherwise it should be grounded, such as an electric soldering iron.
Class I: With working insulation, grounding terminals and grounding wires are required to be grounded and grounded. The grounding wire must use copper core insulated wires with a yellow green dual color appearance. There should be clamping devices to prevent loosening at the outlet of the appliance, and the contact resistance should be less than 0.1 ohms, such as in refrigerators.
Class II: This type of electrical appliance adopts double insulation or reinforced insulation requirements, without grounding requirements. The so-called double insulation refers to the presence of independent protective insulation or effective electrical isolation in addition to working insulation. This type of electrical appliance has a high level of safety and can be used for appliances that come into contact with human skin, such as electric scissors, electric heat combs, etc.
Class III: Various electrical appliances that use safe voltage (below 50 volts), such as shavers, electric combs, electric blankets, etc., must use safe voltage products in situations where there is no safe grounding and dry insulation environment.
Extended Information:
Home appliance placement environment:
1. High temperature environment.
High temperature environments can accelerate the aging of insulation materials in household appliances, and once the insulation materials are damaged, they can cause leakage and short circuits, leading to personal electric shock and even fire accidents.
2. Wet environment.
The washing machine should not be left in the bathroom for a long time, and household appliances should not be placed near flower pots and fish tanks. It is also important to note that containers containing liquids should not be placed on household appliances, and wet cloths should not be used to scrub or rinse electrical equipment with water.
3. Corrosive environment.
The shell and insulation materials of household appliances are subject to long-term chemical erosion, which can shorten their service life. Therefore, household appliances such as refrigerators and washing machines should not be placed in kitchens with severe corrosion and pollution to avoid erosion by gas, liquefied petroleum gas, or oil fumes.
4. Safe environment.
Household appliances should generally be placed in a safe and stable place, and should not be placed in corridors with vibration or easy impact. If placed in an unsafe location, accidentally causing severe vibration and impact on household appliances can cause screws to loosen, solder joints to fall off, and electrical and mechanical components to shift. It can even cause damage such as dents and cracks in the housing of household appliances, misalignment of components, and wire breakage.
