According to the safety performance of lamps, lamps are divided into four categories, namely:
0 class lamps: rely on the basic insulation as anti-electric shock protection - only the wire pvc insulation. If the basic insulation failure (wire damage: such as broken when the line,) resulting in electric shock, fire hazards. Protection against electric shock had to rely on the environment.
Class I Lamps: Protection against electric shock not only depends on basic insulation, but also includes additional safety measures, that is, easy to reach the conductive parts connected to the fixed line in the protective grounding conductor, so that the conductive parts can be touched in case of basic insulation failure Not charged. (0 class lights + ground)
Class Ⅱ lamps class Ⅱ luminaire: Protection against electric shock not only depends on basic insulation, but also with additional safety measures, such as double insulation or reinforced insulation, but no grounding or depending on the installation conditions of protection measures.
Class III lamps: the power used for the safety extra low voltage, and the lamp will not produce higher than the SELV (36v) low voltage. That is: the mains converted to 36v low voltage (plus transformer way).
It can be seen, 0 class lamps is not set up a special grounding device lamps. This type of lighting has the lowest safety performance.