With the continuous development of LED technology, many LED products have gradually replaced the market using traditional light source products.
The current national general standard for lamps in China is still GB7000. 1-Version 2007, this time GB7000. 1-2015 (Hereinafter referred to as the new standard)
, Increased many requirements to adapt to LED lamps, which has played a great role in the certification and testing of LED lamps and lanterns products in China and international mutual recognition.
Nameplate marking, aiming at the characteristics of LED lamps, the standard adds supplementary requirements to the nameplate marking of lamp products using LED as light source.
For example, in the new version of the standard, the lamps that can be installed on the surface of ordinary combustible materials no longer require the F symbol in the mark, which means that products without warning marks have high requirements and wide application range, this saves the content and space of the mark for some very small LED lamps, but if it encounters products that cannot be covered by thermal insulation materials, the relevant symbols are required to be seen during installation, and each side is 25mm small, which needs attention for LED embedded lamps with smaller volume.
The symbol that embedded lamps cannot be covered by thermal insulation materials is different from the ultraviolet radiation of traditional metal halide lamps. The blue light overflow of LED lamps will affect the rhythm of human beings through human retinal nerves, even more harmful to the retina of minors.
The new standard requires that lamps and lanterns should have corresponding marks to warn constructors or users and avoid the risk of blue light hazards.
For portable lamps and handheld lamps, if the product has a threshold illuminance Ethr according to IEC/TR 62778 and the distance between the product and the lamp is more than 200 when the value is reached, the standard thinks that the user may approach the lamp frequently, so it is required to see the warning symbol first when the light source is not seen, reminding the user not to look at the bright light source;
For fixed installed lamps and lanterns, if the same threshold illuminance is met, a distance must be provided in the instruction book, informing the construction party to install the product at a place beyond the distance from people, avoid passing people entering areas with retinal hazards.
In addition to some Self-ballasted LED bulb lamps, the LED light sources of many lamps are designed as non-user replacement or even non-replaceable forms, which leads users to use them, it is impossible to identify whether the lamp can replace the light source.
When the life of a lamp is over or fails, the user often cannot identify the light source state of the lamp from outside the lamp, which leads the user to open the lampshade to find out, if there are live parts inside the lamp at this time, it will cause electric shock hazard.
Different from the connection form of traditional light sources, it is generally equipped with a standard lamp holder component, which may be E14, E27, 2G11, G5, G13, G12, etc. Even if the lampshade is turned on, the light source is replaced by hand, it also has certain anti-electric shock protection capability. The connection method of non-user replacement or non-replaceable LED light source generally does not use standard lamp holders, but uses some connectors or even direct welding, when there are no standard components to provide electric shock prevention, it is very necessary to inform the user of the danger of electric shock. The new standard requires that there should be a warning outside the cover for electric shock prevention and a symbol of electric shock danger (IEC60417-6042).
Electrical insulation most LED modules work under DC, which is different from the working condition of traditional light sources. Obviously, the electrical insulation characteristics of LED lamps will also change.
The new standard mainly adapts to this change from creepage distance, electrical clearance, electrical strength and some related structural requirements.
The new version of the standard shows a trend of relaxation in the requirements for creepage distance and electrical clearance of lamps and lanterns. First, ordinary lamps and lanterns and non-ordinary lamps and lanterns (IPX1 or above)
It is believed that as long as the enclosure protection can be qualified, the lamp cavity is equivalent to the environment of ip20.
At the same time, the creepage distance and electrical clearance under DC voltage are clearly specified: for creepage distance, the equivalent DC voltage is equal to the effective value of sinusoidal AC voltage, for electrical clearance, the equivalent DC voltage is equal to the peak value of AC voltage.
This means that the limit value of creepage distance directly regards DC voltage as AC effective value for table lookup calculation, and at the same time there is a conversion between peak value and effective value in the electrical clearance.
With the decrease of creepage distance and gap requirement, the voltage value of electrical strength test also shows a downward trend.
The additional insulation is reduced to 2U 1000 equivalent to the basic insulation requirement, and the double insulation or reinforced insulation is reduced to 4U 2000. Due to the limited space inside some small LED lamps, the distance between poles, the distance between the pole and the shell is small. Due to the relaxation of this clause, such lamps are undoubtedly easier to pass the test.
LED lamps also have programmable characteristics and can be closely related to intelligent lighting. Therefore, compared with traditional lamps, LED lamps have many control circuits, dimming circuits, etc, the new standard also adds insulation requirements between various lines, such as SELV circuit and LV power supply, SELV circuit and FELV circuit, etc.
For details, please refer to Appendix X of the standard, which specifies the insulation requirements between active components and accessible conductive components of circuits in various lamps.