The national standard "safe voltage" stipulates that China's safe voltage ratings are 42V, 36V, 24V, 12V and 6V, which should be selected according to the workplace, operator conditions, mode of use, power supply, line conditions and other factors. Safety voltage is the voltage that does not cause personal electric shock accident, generally lower than 36 volts.
Safety voltage, is the voltage that does not cause direct death or disability. General environmental conditions allow continuous contact with the "safe low voltage" is 24V. (May also be 36V, 12V AC/DC, 24V is the most common)
Related regulations on safety voltage:
According to the characteristics of production and workplace, the use of the appropriate level of safety voltage is to prevent the occurrence of electrocution casualties. fundamental measures to prevent electric shock casualties from occurring. The national standard "Safe Voltage" (GB3805-83) stipulates that China's safe voltage ratings are 42V, 36V, 24V, 12V and 6V, which should be selected according to the workplace, operator conditions, mode of use, mode of power supply, line conditions and other factors.
The Safe Voltage (GB3805-83) is the most authoritative and basic standard about the voltage which is not dangerous to people. Fully analyze the data in the table can be seen, in the most unfavorable conditions (in addition to medical and human body submerged in water), this limit is: 15 ~ 100Hz AC voltage (RMS) does not exceed 16v; ripple-free DC is 35v. 50Hz AC 16V value, compared to today's engineering habits (and even junior high school physics textbooks) is also used in 36V, much lower; even lower than the GB4706.5.1, released in 1998. GB4706.1-98 issued in 1998 (household and similar electrical appliances safety requirements) in the safety of the special low voltage not exceeding 42V value.
September 1, 2008, the implementation of the "extra-low voltage (ELV) limits" GB/T3805-2008 do not know what new provisions, now can not find the full text.
The safe voltage value is different from country to country, according to the specific environmental conditions in China, the safe voltage value is stipulated as follows:
65V in the building without high electric shock risk.
24V in the building with high electric shock risk.
12V in the building with extra low electric shock risk.