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Class Types for appliances consider the insulation system of the product. It specifies measures to prevent dangerous contact voltages on unenergized parts of the electronic device. According to the measures, it can be divided into four Class, Class 0, Class I, Class II, and Class III. We here mainly discuss I, II, and III.
Class I LED lights have basic insulation and must incorporate a protective earth connection to mitigate the risk of electric shock. The safety of them is achieved by using basic insulation and also providing a means of connecting to the protective earth conductor in the building where by routing those conductive parts that are otherwise capable of assuming hazardous voltages to earth ground if the basic insulation fails. This means a class I LED light will provide a terminal/pin for earth ground connection.
Class II LED lights not only rely on basic insulation to prevent electric shock protection but also must provide additional safety protection measures such as double insulation or reinforced insulation. There is no reliance on either protective earth or installation conditions. This means a class II LED light does not have a terminal/pin for earth ground connection.
To get Class II certificated LED lights, we must install Class II certificated LED drivers. Below is the picture of a Class II driver with the &#;&#;&#; symbol. Furthermore, we should use two layers of insulating material between live parts and the user, or use reinforced insulation so that no dangerous voltage will become exposed which might cause an electric shock. Now ZGSM has many series street lights that are class II certificated, for example, H series, K series, and Rifle series.
Class II symbolClass III LED light is defined as that protection against electric shock depends on the absence of a voltage above safety extra-low voltage (SELV). SELV is defined in the relevant standards as the voltage not exceeding 25VAC or 60VDC. So the extra safety features built into Class I and Class II LED lights are therefore not required for Class III LED lights. For example, ZGSM solar or DC input street lights are Class III classified.
For more information about Key Factors to Consider in the Street Lighting Design,you can read our related article &#;Key Factors to Consider in the Street Lighting Design&#;.
Class 1 and Class 2 come from UL standard. UL (NEC Class 2 Power Units) are product safety standards that aim to keep humans safe by lowering the possibility of a hazardous situation.
The UL , Class 2 Power Units, standard applies to power supplies within a limited output current and output voltage range. The Class 2 standard is specified in UL Standard Number UL.
Class 1 products have output ranges outside UL Class 2 designations. An LED Driver with a UL Class 1 rating has a high-voltage output and safety protection is required within the fixture (LED light).
Class 2 product is with an electronic circuit whose output current and power are under the limitation shown in UL Table as below. They operate using less than 60 volts in dry applications, 30 volts in wet applications, less than 5 amps, and less than 100 watts. So the risk of fire can be reduced significantly. And the safety distances and flammability rating of components can be much lower.
Circuit voltage (Vmax ) a,b ac or dc Volts Maximum nameplate ratings Maximum output current (Imax )c, Amperes Volt-Amperes Amperes 0 &#; 20 5.0 X Vmax 5 8 Over 20 to 30 100 100/Vmax 8 Over 30 to 60, dc only 100 100/Vmax 150/Vmax Class 2 symbolClass 1 material is a designation of the RWMA. The Resistance Welding Manufacturers Alliance (RWMA) is an organization of leading manufacturers of resistance welding equipment and materials. The alliance was established to promote the use of resistance welding and to provide technical expertise.
Class 1 is often used to weld aluminum and other good conductors like brasses and bronzes which require high weld currents.
Class 2 material is a designation of the RWMA. Class 2 is the most used material in the resistance welding industry. As electrodes it is used for welding bare and coated steels.
In brief, the table below shows the difference between Class I, Class II, Class III, Class1, and Class2.
ClassifyClass IClass IIClass IIIClass1Class2AuthorityIECIECIECNECNECInsulationBasic insulationDouble Insulated/Electrical limitationElectrical limitationSymbol ULULCharacteristicthree-wire power cordtwo-wire power cordSolar or others with extra-low voltagePower&#; Volt-AmpsVoltage&#;60&#;Dry&#;We will find that Class I, Class II, or Class III has no connection with Class 1 or Class 2. There are two standards for electrical equipment. In the market, LED light can be with Class II standard, but it&#;s not with Class 2 LED driver. However, Class II certificated LED light must be with Class II LED driver. Meantime, an LED light with a Class II LED driver doesn&#;t mean that it&#;s Class II certificated. You have to check whether the product is with two layers of insulating material or reinforced insulation between live parts and the user. It&#;s important when we are applying for Class II certificates.
With the above clarification, We believe that you have a good understanding of Class I/II/III and Class 1/2. Hope this will help you find suitable LED products that you need.
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Understandably, there is sometimes misunderstanding about the distinction between Class 2 and Class II rated ac-dc power supply. The distinctions are crucial and must be understood. The NEC (National Electric Code) designation of Class 2 relates to the output voltage and power capabilities of ac-dc supplies, while the IEC (International Electrotechnical Commission) protection designator, Class II, refers to the internal architecture and electrical insulation of a power supply.
IEC Class I input models have basic insulation and must incorporate a protective earth (ground) connection to mitigate the risk of electric shock.
IEC Class II input models feature additional safety precautions such as double insulation or reinforced insulation, thereby eliminating the need for a protective earth (ground) connection. Therefore, Class II input power supplies have a 2-pin input receptacle [IEC C8 or C18 type] instead of the 3-pin input receptacles found on Class I input models.
My name is Taylor Gong, I&#;m the product manager of ZGSM Tech. I have been in the LED lights industry for more than 13 years. Good at lighting design, street light system configuration, and bidding technology support. Feel free to contact us. I&#;m happy to provide you with the best service and products.
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Insulation may be grouped into the following recognised classes:
Class A insulation consists of materials such as cotton, silk and paper when suitably impregnated or coated or when immersed in a dielectric liquid such as oil. Other materials or combinations of materials may be included in this class if by experience or tests they can be shown to be capable of operation at the Class A temperature.
Maximum allowed temperature: (IEC-1 & NEMA MG1-12.43): 105C, 221F.
Class B insulation consists of materials or combinations of materials such as mica, glass fibre, asbestos, etc., with suitable bonding, impregnating or coating substances (beware a few older applications used asbestos). Other materials or combination of materials, not necessarily inorganic, may be included in this class, if by experience or tests they can be shown to be capable of operation at the class B temperature.
Maximum allowed temperature: (IEC-1 & NEMA MG1-12.43): 130C, 266F.
Class C insulation consists of materials or combinations of materials such as mica, porcelain, glass, quartz with or without an inorganic binder (beware a few older applications used asbestos). Other materials or combinations of materials may be included in this class, if by experience or tests they can be shown to be capable of operation at temperatures above the Class H limit. Specific materials or combinations of materials in this class will have a temperature limit, which is dependent upon their physical, chemical and electrical properties.
Maximum allowed temperature: (IEC-1 only): >180C, 356F.
Class E insulation consists of materials or combinations of materials, which by experience or tests can be shown to be capable of operation at Class E temperature (materials possessing a degree of thermal stability allowing them to be operated at a temperature 15 Centigrade degrees higher than Class A materials).
Maximum allowed temperature: (IEC-1 only): 120C, 248F.
Class F insulation consists of materials or combinations of materials such as mica, glass fibre, asbestos, etc., with suitable bonding, impregnating or coating substances, as well as other materials or combinations of materials, not necessarily inorganic, which by experience or tests can be shown to be capable of operation at the Class F temperature (materials possessing a degree of thermal stability allowing them to be operated at a temperature 25 Centigrade degrees higher than Class B materials).
Maximum allowed temperature: (IEC-1 & NEMA MG1-12.43): 155C, 311F.
Class H insulation consists of materials such as silicone elastomer and combinations of materials such as mica, glass fibre, asbestos etc., with suitable bonding, impregnating or coating substances such as appropriate silicone resins. Other materials or combinations of materials may be included in this class if by experience or tests they can be shown to be capable of operation at the Class H temperature.
Maximum allowed temperature: (IEC-1 & NEMA MG1-12.43): 180C, 356F.
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