Standards are the basis of product quality. Understanding standards and implementing standards is an important task to improve product quality. When we implement standards and ensure product quality as the basic principle of the company, ubiquitous lamps will provide safe and harmonious work. The living and entertainment environment enables people to fully enjoy the happy life brought by the light.
The significance of the standard
GB7000.1-2007 "Lamps Part 1: General Requirements and Tests" was released on November 12, 2007, and will be implemented on January 1, 2009.
As a general requirement and test standard in the safety standards of lamps, GB7000.1 is cited by other standards of GB7000 series and is the basic standard for lamp safety. Compared with the 2002 version, GB7000.1-2007 has changed a lot, such as the removal of Class 0 luminaires in the luminaire classification, the increase of the abnormal conditions in the durability test, and the expansion of the illuminating abnormal circuit conditions. Scope, etc., these changes will have an impact on the lighting industry, especially the lighting industry.
Differences between old and new basic standards
For the implementation of GB7000.1-2007 standard, the author now makes the main difference between GB7000.1-2007 and the previous version of GB7000.1-2002 "General Safety Requirements and Tests for Luminaires" (hereinafter referred to as "old standard") analysis.
(1) The new standard removes Class 0 lamps
1. Definition of Class 0, Class I, Class II and Class III lamps
According to the type of anti-shock type, the lamps can be classified into Class 0, Class I, Class II or Class III lamps, which are defined as follows:
(1) Class 0 lamps
Relying on basic insulation as a luminaire for protection against electric shock. This means that the accessible conductive parts of the luminaire (if such parts) are not connected to the protective conductors in the fixed wiring of the facility, and in the event of a failure of the basic insulation, they have to rely on the environment.
(2) Class I lamps
The protection against electric shock of the luminaire not only depends on the basic insulation, but also includes additional safety measures, that is, the accessible conductive parts are connected to the protective grounding conductors in the fixed wiring of the installation, so that the accessible conductive parts fail in the event of basic insulation failure. Do not bring electricity.
(3) Class II lamps
The protection against electric shock of luminaires depends not only on basic insulation, but also on additional safety measures such as double or reinforced insulation, without protective earthing or depending on installation conditions.
(4) Class III lamps
Protection against electric shock relies on a supply voltage that is safe extra low voltage (SELV) and does not produce a luminaire that is higher than the SELV voltage.
2. The necessity of class 0 lamps to be deleted
(1) Basic rules for protection against electric shock
Under normal conditions or under single fault conditions, hazardous live parts should not be touched and accessible conductive parts should not be dangerous live parts.
Protection under normal conditions is provided by basic protection and protection under single fault conditions is provided by fault protection. Enhanced protection measures provide protection in both cases.
(2) Normal conditions
Basic protection is essential to meet the requirements of the basic rules of protection against electric shock for protection against electric shock under normal conditions.
(3) Single fault condition
A single failure is considered when the following conditions occur:
The accessible non-hazardous live part becomes a dangerous live part (for example, due to failure to limit steady-state contact current and charge measures); or accessible electrically conductive parts that are uncharged under normal conditions become dangerous charged parts ( For example, due to damage to the substantially electrically conductive portion of the exposed conductive portion; or dangerous live parts may be accessible (eg, due to mechanical damage to the outer casing).
To meet the requirements of the basic rules for protection against electric shock in the protection against electric shock under a single fault condition, fault protection is essential. This protection can be achieved by the following methods:
Use further protection that does not rely on basic protection; or use enhanced protection with both basic and fail-safe features.
Class 0 luminaires use basic insulation as a basic protection without fail-safe measures. Class 0 luminaires are for non-conductive environments only. Class I luminaires are protected by equipotential bonding, that is, basic insulation is used as a basic protective measure, and protection equipotential bonding is used as a fault protection measure. Class II luminaires are protected by double or reinforced insulation, ie basic insulation is used as a basic protective measure, additional insulation is used as a fail-safe measure or reinforced insulation that provides basic protection and fault protection. Class III luminaires are protected by SELV in electrical quantity limits.
Compared with Class I, Class II and Class III luminaires, since Class 0 luminaires use basic insulation as the basic protection, and there is no fault protection measures, there are the basic rules for the above-mentioned protection against electric shock. Therefore, Class 0 fixtures are removed in GB7000.1-2007.
3. The new standard increases the protection against electric shock on the outer surface of the luminaire that cannot be used for basic insulation components without accidental contact measures.