In the current GB7000.1-2002 standard, lamps are divided into four categories according to the type of electric shock protection, namely, Class 0 lamps, Class I lamps, Class II lamps and Class III lamps.
1、 Class 0 lnminaire
Lamps that rely on basic insulation for electric shock protection. This means that the easily accessible conductive parts of the lamp (if any) are not connected to the protective conductor in the fixed line of the facility. In case of basic insulation failure, the environment has to be relied on.
2、 Class 1 luminaire
The electric shock protection of lamps not only depends on the basic insulation, but also includes additional safety measures, that is, connecting the accessible conductive parts to the protective conductor in the fixed line of the facility, so that the accessible conductive parts will not be electrified when the basic insulation fails.
3、 Class II Luminaire
The protection against electric shock not only depends on the basic insulation, but also has additional safety measures, such as double insulation or reinforced insulation. However, there is no protection measures that rely on grounding or installation conditions.
4、 Class III Luminaire
The protection against electric shock depends on a class of lamps whose power supply voltage is a safety extra low voltage (SELV) and in which no voltage higher than SELV is generated. The protection against electric shock is an important indicator for evaluating the safety characteristics of lamps. However, previous spot checks by the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) show that the protection against electric shock of lamps and lanterns in China is unqualified, which is in the forefront of various items that are unqualified in spot checks.
It can be seen from the standard definition that Class 0 lamps provide the lowest electric shock protection. In order to ensure that Class 0 lamps can be used safely, the current standard specifies how to use Class 0 lamps. For example, Article 1.2.21 of the standard stipulates that Class 0 lamps are only applicable to ordinary lamps; According to Article 2.2, lamps with rated voltage over 250V shall not be classified as Class 0, lamps used under adverse conditions shall not be classified as Class 0, and lamps installed on rails shall not be classified as Class 0. Class 0 lamps rely on basic insulation as electric shock protection, and the use environment is limited to non-conductive places. However, in the actual use process, it is difficult for users to identify the categories of lamps one by one and whether the use environment belongs to non-conductive environment. Based on this consideration, the new standard eliminates category 0 lamps
