In a dry air environment, human skin impedance can withstand a voltage of about 50V without getting an electric shock, but in a humid environment, if it exceeds12 V, it may cause an electric shock accident. Therefore, when people stand on the wet ground or touch the water pipe in the bathtub, they may get an electric shock, and when they take a shower, they will feel numb because of the stepping voltage. Therefore, in order to ensure the safe use of electricity in bathrooms and kitchens, indoor electrical equipment should take the following measures:
1. If possible, consider using a low-voltage power supply (for example, step down with a transformer). Although the general place 36V is safe voltage, the bathroom and kitchen are damp places, which belong to the special environment with electrical danger, so 24V safe voltage should be adopted.
2. When using 220 volt power supply, electric shock protector or leakage switch should be installed. Once the electrical appliances and lines leak, the power supply will trip.
3. The distribution lines in the bathroom and kitchen should adopt flame-retardant trough plates or conduits, and the distribution lines should be as far away from the bathroom or water pipes as possible. It is strictly forbidden for water distribution pipes to pass under water pipes, tubs or other water containers.
4. All metal components in the bathroom and kitchen, such as hot and cold water pipes, various metal pipe heads, floor drains, heating pipe heads, building steel structures, pe wires entering the room, etc., should be connected with each other by 20×3mm flat steel or copper core wires not less than 6 square millimeters.
Form a local equipotential connection network to prevent potential difference caused by externally introduced voltage. However, if there is no PE wire indoors, it must not be introduced from outside to avoid introducing undue voltage. 5. Install electrical appliances as little as possible in the bathroom, and it is best not to set other sockets except the special socket for exhaust fan. If other power outlets must be installed, they must be far away from barrels and basins, and equipped with leakage protectors with starting current not greater than 30mA.
6. Waterproof and moisture-proof lighting lamps should be selected; The installation height of exhaust fan, bathroom heating lamp and lighting equipment shall not be less than 2.2m, and the heating lamp is generally installed on the roof of the bathroom.
7. The uncharged metal shell of electrical equipment must be grounded (PE wire) according to regulations, and the grounding resistance shall be ensured to be no more than 4 ohms.
8. All electrical equipment in the bathroom and kitchen must be regularly cleaned of oil and dust on the surface, and the power supply must be cut off when cleaning; And do regular maintenance work to eliminate hidden dangers.
The above is the relevant introduction of this article. I believe you will have a simple understanding of it after reading it. If necessary, follow the 1 home network for more information.