Open socket installation height from the ground is generally about 1.5-1.8m, dark socket distance from the ground can not be less than 0.3m. If there are children and the elderly in the home, but also choose a safety socket with an insurance block, to prevent children from touching the socket holes lead to electric shock and other accidents.
In general, low voltages are below 1100 volts, amps are 200,250,320,420,660 amps, and so on. High voltages above 7200 volts, 350 amps, 500 amps, are commonly used in coal mines, mines, tunnels, railways, ports, power stations and other areas.
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