Safe voltage refers to the series of voltages below 50V supplied from a specific power source.
Safety voltage is a series of specific power supply voltage below 50V adopted to prevent electric shock accidents, which is divided into five levels of 42V, 36V, 24V, 12V and 6V, and different levels of safety voltage are selected according to different operating conditions. The safety voltages commonly used in construction sites are 12V, 24V and 36V.
Special places must be powered by safety voltages for lighting.
The following special places must use safe voltage power supply lighting:
(1) indoor lamps and lanterns below 2.4m from the ground, hand-held lighting fixtures, general wet workplace (basement, wet room, wet staircase, manned works, tunnels, and high temperatures, conductive dust, etc.) of the lighting, the power supply voltage should be not more than 36V.
(2) in the wet and easy to Lighting power supply voltage in the place of touching the electrically charged body, should not be greater than 24V.
(3) In particularly humid places, boilers or metal containers, conductive ground using hand-held lighting lamps and so on, the lighting power supply voltage should not be more than 12V.