Lamps: A device that distributes, transmits, or transitions light from one or more light sources and includes components necessary to support, secure, and protect the light source (but not the light source itself), and the necessary circuit aids and They are connected to the power supply facility.
2. Ordinary lamps: to provide protection against accidental contact with live parts, but no special dust, anti-solid foreign body and waterproof grade lamps.
3. Portable lamps: normal use, the lamp connected to the power supply can be moved from one place to another lamp.
4. Fixed fixtures: lamps that can not be easily moved from one place to another because they are fixed so that they can only be disassembled by means of a tool.
5. Embedded lamps: Manufacturers specify lamps that are fully or partially embedded in the mounting surface.
6. Live parts: In the course of normal use, may cause electric shock of the conductive parts. The center conductor should be considered a live part.
7. EN SELV-safety extra-low voltage: The AC voltage is effective between circuits such as a safety isolating transformer or a converter that is isolated from the power supply, between conductors or between any conductor and ground The value does not exceed 50V.
8. UL low voltage line: open circuit voltage does not exceed the AC voltage RMS 30V line.
9. Basic insulation (EN): added to the live parts to provide basic protection against electric shock. The pressure should be above 2U + 1000V (U: local grid voltage).
10. Supplemental Insulation (EN): Independent insulation attached to basic insulation for protection against basic insulation failure. The pressure value should be above 2U + 1750V (single layer).
11. Double insulation (EN): the basic insulation and insulation composition of the insulation, pressure value should be 4U +2750V or more (that is, the basic insulation and insulation and the sum of insulation).
12. Enhanced insulation (EN): Insulation effect and double insulation is equivalent to a reinforced insulation. On the whole, it is generally only one layer, but it can also be composed of multiple layers, and each layer can not be clearly segmented and measured separately. The pressure value should be above 4U + 2750V.
13. CLASS O-level lights (EN): only the basic insulation for the protection of light fixtures, no grounding and other protective measures.
14. CLASS Class I (EN): In addition to the basic insulation for the electric shock protection measures, but also the use of other protective measures such as grounding lamps.
15. CLASS Class II fixtures (EN): Take double insulation or increase the insulation for the electric shock protection measures. The insulation effect does not depend on the grounding or installation conditions.
16. CLASS Class III (EN): Use special low safety voltage (SELV) for the protection of lightning protection.
17. Normal flammable material: The ignition temperature of the material is at least 200 ° C and the material is not deformed or reduced at this temperature. Such as wood and wood-based materials with a thickness greater than 2 mm.
18. Flammable material: A material other than conventional combustible material and non combustible material. Such as wood fibers and wood-based materials with a thickness of less than 2.
19. Non-combustible material: non-combustible material. Such as metal, cement and so on.