According to the safety performance of the luminaire, the luminaires are divided into four categories, namely:
Class 0 lamps: rely on basic insulation as protection against electric shock - only by the pvc of the wire for insulation. In case of basic insulation failure (wire breakage: broken skin when passing the line), resulting in electric shock and fire hazard. Protection against electric shock has to rely on the environment.
Class I luminaires: Protection against electric shock not only relies on basic insulation, but also includes additional safety measures, that is, connecting accessible conductive parts to protective earthing conductors in fixed lines, so that accessible conductive parts fail in the event of basic insulation failure. Not to be charged. (0 type lighting + ground wire)
Class II lamp class II luminaire
1. Definition of Class II lamps:
Protection against electric shock not only relies on basic insulation, but also has additional safety measures, such as double or reinforced insulation, but without grounding or protection depending on the installation conditions.
2. Characteristics and standard requirements for Class II lamps:
(1) Such a luminaire can have one of the following forms:
(a) Complete enclosure luminaires made of durable and sturdy insulating material that encases all metal components, except for small components such as nameplates, screws and rivets that are completely isolated from live parts by insulating materials. At least equivalent to reinforced insulation. Such a luminaire is referred to as an insulated casing type II luminaire.
(b) Luminaires with a sturdy, all-metal enclosure, all of which are double insulated, except for those that are clearly not usable with double insulation. Such a luminaire is referred to as a metal casing type II luminaire.
(c) A luminaire having a combination of the above a) and b).
(2) The outer casing of the insulated casing type n luminaire may be part or all of the supplementary insulation or reinforced insulation.
(3) If the grounding is to help start, rather than directly accessing the accessible metal parts, the luminaire is still considered a Class II luminaire. The base of the lamp housing and the starter belt of the light source are not considered to be accessible to metal parts, except as determined by the test in Appendix A as live parts.
(4) If a luminaire with double or reinforced insulation has a uniform grounding terminal or grounding contact, the luminaire is of Class I construction. However, if a fixed Class II luminaire is used for loop installation, it may have an internal terminal that is used to maintain the electrical continuity of the ground conductor that does not terminate within the luminaire. The internal terminals are isolated from accessible metal by Class II insulation.
Class III luminaires: The power supply used is a safety extra low voltage, and the inside of the luminaire does not generate a low voltage higher than SELV (36v). Namely: convert the mains into a low voltage of 36v (plus transformer).
It can be seen that the type 0 luminaire is a luminaire without a special grounding device. This type of luminaire has the lowest safety performance.
Editor: Yingzi
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