Do I need to install a leb ground wire in my public **** bathroom?

Not required, in accordance with the electrical safety class.　　1. Class O electrical appliances Electrical appliances that rely on basic insulation to prevent electric shock. It has no grounding protection, and there is no connection between the accessible conductive part and the protective conductor in the fixed wiring of the equipment. If the basic insulation is damaged, the equipment relies on the surrounding environment for protection. Generally, this type of equipment is used in places where the working environment is favorable. In recent years, the safety requirements for household appliances have become increasingly stringent, O class appliances have been increasingly reduced, the old single-speed pull-wire switch control ceiling fan is O class appliances.

2. O Ⅰ type of appliances at least the whole of the basic insulation and with a grounding terminal of the appliance, the power cord has no grounding wire, no grounding protection plug pins, can not be inserted into the power outlet with a grounding terminal. Most of the old domestic fluctuating type power washers are OⅠtype appliances. Only the grounding terminal, but not the grounding wire to the grounding terminal, when used by the user with a grounding wire will be directly grounded shell.

3. Ⅰ type of appliances in addition to relying on the basic insulation for protection against electric shock, but also includes an additional safety measure, the method is easy to touch the conductive parts and has been installed in the fixed line of the protection of the grounding conductor connected to the conductive part of the easy-to-touch in the basic insulation fails, will not become a charged body. For example, domestic refrigerators are Class I appliances - connected to the grounding wire.

4. Class II appliances not only rely on basic insulation, but also have additional safety precautions. Generally the use of double insulation or reinforced insulation structure, but whether the protective grounding depends on the conditions of installation, does not specify. For example, most domestic electric blankets are Class II appliances. Class II appliances are marked with a special symbol: the return mark

5. Class III appliances These appliances rely on the isolation transformer to obtain a safe extra-low voltage power supply to protect against electric shock. At the same time, in any part of the circuit inside the appliance, will not generate a higher voltage than the safe extra low voltage. The International Electrotechnical Commission (IEC) publication Safe Extra Low Voltage (SUV) refers to a specific series of supply voltages that are used to prevent electric shock accidents. The upper limit of this voltage shall in no case exceed 50V AC (50-500Hz) rms between two conductors or between any conductor and earth.