Knowledge Builders

what is a class 2 led

by Santino Lakin Published 8 months ago Updated 3 months ago
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The drivers used in a typical LED lighting system in residential and commercial applications are listed as Class 2 or are individually identified as recognized components and intended to be used as part of an NRTL listed field-installed LED lighting assembly.

Class 2 LED Driver
These LED drivers have a voltage rating of fewer than 60 volts (in dry applications) and 30 volts (in wet applications), a current rating of fewer than 5 amps, and a wattage rating of fewer than 100 watts. Due to these restrictions, the number of LEDs that a Class 2 LED driver can handle is limited.
Dec 18, 2021

Full Answer

What is the difference between Class 1 and Class 2 LED drivers?

An LED Driver with a UL Class 1 rating has a high-voltage output and safety protection is required within the fixture. A Class 1 driver can accommodate more LEDs, making it more efficient than a Class 2 driver. In addition, confusion often exists regarding the difference between Class 2 and Class II rated ac-dc power supplies.

Can led led power supplies be Class 2 compliant?

LED Power supplies can take 120V of power and convert it down into low-voltage 12V or 24V power. In order for the power supply to be Class 2 compliant, 12V drivers must be 60W and under and 24V drivers must be 96W and under. These limitations are in place to lower the risk of electric shock or overheating from excessive currents.

What is the difference between UL Class 1 and Class 2?

UL Class 1 drivers 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. A Class 1 driver can accommodate more LEDs, making it more efficient than a Class 2 driver.

What are the different classes of LED lights?

Generally speaking LEDs would be in the lower Classes (1, 1M, 2, 2M, 3R), but very exceptionally may be Class 3B. At the time of writing we are not aware of any Class 4 LEDs*.

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What is a Class 2 LED driver?

Class 2 LED drivers that are listed or part of a listed system comply with UL 1310 Standard for Safety for Class 2 Power Units which requires the output voltage to pose no risk of fire or electric shock which makes secondary circuit protection unnecessary.

What is a Class 2 LED light?

What's Class II? 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.

What is a Class 2 power unit for LED lights?

With Class II power supplies, there are two layers of insulation, or a single layer of reinforced insulation, between the user and the internal current carrying components. In these types of power supplies with two layers of insulation, the first layer is often referred to as “Basic Insulation”.

Is Class 1 or Class 2 better?

Generally, Class 1 drivers are paid a higher wage and do long-haul driving, whilst Class 2 drivers usually work around towns and cities.

What is the difference between Class 1 and Class 2 lighting?

The vast majority of light fittings are known as class 1 which means they require an earth wire. Fittings which don't require an earth wire will always be marked as class 2 and / or double insulated.

How do I know if I have a Class 2 power supply?

IEC protection Class II power supplies will have a two-wire power cord as opposed to a three-wire power cord with Safety Earth connection. Products designed with Class II insulation often are labeled as “Class II” or “double insulated” or will have the concentric square symbol on the safety label.

When would you use a Class 2 power supply?

Class 2 relates to the power supply's safety, and it limits the maximum power that the power supply can deliver. Class 2 power supply is popular in the automation, control, and the power supply lighting industry because of lower safety protection requirements, decreasing complexity and cost during installation.

What does a Class 2 power supply mean?

Class II (with Roman numerals) refers to power supplies with either a double or reinforced insulation barrier between the input and the output. Class II supplies do not rely on an earth connection to protect against shock hazard. Many cell phone chargers and laptop power supplies are Class II.

What is the difference between a Class 1 and Class 2 power supply?

Class I - where user protection from electric shock is achieved through a combination of insulation and a protective earthing/ground. Class II - where user protection from electric shock is achieved through two levels of insulation (either double or reinforced), without the need for earthing.

How do I know if my appliance is Class 1 or Class 2?

The required PAT tests for Class I appliances are the Earth Continuity and Insulation Resistance tests which will check the basic insulation and earth connection. A Class II appliance usually has a plastic cover. The only way to accurately identify it is to look for the Class II appliance symbol.

Is Class 2 the same as 7.5 tonne?

What is a Class 2 Lorry Licence? A Class 2 HGV lorry licence is the same as an LGV or HGV lorry licence which allows you to drive a vehicle over 7.5t and up to 32 tonnes.

What is class 1 and class 2 electrical equipment?

Class 1 and Class 2 appliances are all powered by mains voltages. Both classes are required to provide at least two levels of protection to the end user. You could see this as a back-up; if one protection layer fails then the second layer back-up is still in place. This makes electrical equipment safe to use.

What is a Class 2 light fixture?

Class 2 lighting fixtures contain no electronics in the fixtures themselves. The dimming control power conversion and constant current drivers for multiple fixtures are housed in a remote DC, Class 2 intelligent power supply, which can be located up to 150′ away from the fixtures.

What is the difference between Class 1 and Class 2 electrical equipment?

The required PAT tests for Class I appliances are the Earth Continuity and Insulation Resistance tests which will check the basic insulation and earth connection. A Class II appliance usually has a plastic cover. The only way to accurately identify it is to look for the Class II appliance symbol.

What is the difference between a Class 1 and Class 2 power supply?

Class I - where user protection from electric shock is achieved through a combination of insulation and a protective earthing/ground. Class II - where user protection from electric shock is achieved through two levels of insulation (either double or reinforced), without the need for earthing.

What is a Class 2 power source?

Class II (with Roman numerals) refers to power supplies with either a double or reinforced insulation barrier between the input and the output. Class II supplies do not rely on an earth connection to protect against shock hazard. Many cell phone chargers and laptop power supplies are Class II.

What is class 2 AC DC?

The differences are significant and important to understand. The NEC (National Electric Code) identification of Class 2 refers to the output voltage and power capabilities of ac-dc supplies, while the IEC (International Electrotechnical Commission) designator of protection, Class II, refers to a power supply’s internal construction and electrical insulation.

What is UL Class 1 LED?

UL Class 1 drivers 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. A Class 1 driver can accommodate more LEDs, making it more efficient than a Class 2 driver.

What is class 2 insulation?

Products designed with Class II insulation often are labeled asClass II” or “double insulated” or will have the concentric square symbol on the safety label. This symbol just like Chinese characters “回”. In brief, the table below shows the difference between Class I, Class II, Class1 and Class2. Classify.

What is the difference between UL Class 1 and UL Class 2?

UL Class 2 drivers comply with standard UL1310, meaning output is considered safe to contact and no major safety protection is required at the LED/luminaire level. There is no risk of fire or electric shock.

What class is a visible laser pointer?

Extended sources have higher power limits than point sources for a given laser Class. Therefore a visible LED emitting 10 mW may be Class 2, while a visible laser pointer of the same power would be Class 3B. NB Laser pointers above Class 2 are banned for sale to the public by trading standards. CW.

When did the IEC abolition of class 3A?

In 2001 the standard governing the safety of laser products in Europe (EN) and Internationally (IEC), was substantially revised and the Classification system was overhauled. This resulted in the introduction of three new laser classes (1M, 2M and 3R) and the abolition of Class 3A. Below is a brief description of each of the current laser classes.

What are some examples of laser products?

Notable examples of this are CD and DVD players which are Class 1 laser products while containing Class 3R or Class 3B lasers and laser printers which are Class 1 laser products but contain Class 4 embedded lasers.

What is class 2 power?

Power. The more important part of the NEC Class 2 standard is the power limitations of the power supply. LED Power supplies can take 120V of power and convert it down into low-voltage 12V or 24V power. In order for the power supply to be Class 2 compliant, 12V drivers must be 60W and under and 24V drivers must be 96W and under.

How many layers of insulation are there in a Class II power supply?

With Class II power supplies, there are two layers of insulation, or a single layer of reinforced insulation, between the user and the internal current carrying components. In these types of power supplies with two layers of insulation, the first layer is often referred to as “Basic Insulation”.

What is the second layer of insulation?

Basic insulation is the insulation that you see around the wires coming out of the power supply. The second layer is usually an insulating case around the power supply. Class II power supplies can be identified on the label by a symbol of a large square with a smaller square inside of it.

Can I use multiple 12V power supplies?

However, for larger projects such as home remodels or commercial space builds, a large amount of power is needed to power multiple lights. You can install multiple 12V 60W Class 2 LED Power Supplies or you can install a high wattage multi-tap power supply like a 12V 240W Class 2 LED Power Supply. High wattage multi-tap power supplies, like a 12V 240W power supply, contain 4 separate 60W outputs. Each output has its own circuit breaker so if one of them were to experience a power surge the other outputs won’t be affected. Using a large power supply, when it’s needed, is a more affordable solution and easier to install than multiple power supplies.

What is a class 2 circuit?

Class 2 and 3 circuits are defined as the portion of the wiring system between the power source and the connected equipment. Because of the power limitations of Class 2 circuits, many consider them to be safe from a fire initiation standpoint and to provide an acceptable level of protection from electrical shock. Class 3 circuits limit the output power to a level that usually will not initiate fires. But, they can and do operate at higher voltage levels and, therefore, can present a shock hazard.

What is the minimum size of a class 2 or 3 circuit?

Substitute cables for the circuit type. The minimum size circuit is 18 AWG when a Class 2 or 3 circuit is reclassified and used as a Class 1 circuit. But remember, most Class 2 or 3 circuits usually are wired using listed cable types specified by the NEC.

When a circuit fails, what is the hazard?

For example, when the failure of a circuit component can create a significant hazard, such as an explosion or fire, a Class 1 circuit, and not a Class 2 or 3 circuit, must be used. Bottom line, a component failure that is capable of producing a direct hazard is required to be installed in conduit or be provided with physical protection.

What is UL Class 2?

UL Class 2 drivers comply with standard UL1310, meaning output is considered safe to contact and no major safety protection is required at the LED / luminaire level. There is no risk of fire or electric shock. These drivers operate using less than 60 volts in dry applications, 30 volts in wet applications, less than 5 amps, and less than 100 watts. However, these limitations pose restrictions on the number of LEDs a Class 2 driver can operate.

What are LED drivers?

Due to increasing energy regulations, most people are familiar by now with the long life spans and energy savings associated with LEDs, or light-emitting diodes. However, many are not aware that these innovative light sources require specialized devices called LED drivers to operate. LED drivers (also known as LED power supplies) are similar to ballasts for fluorescent lamps or transformers for low-voltage bulbs: they provide LEDs with the electricity they require to function and perform at their best.

What wattage should LED drivers use?

According to the NEC (National Electrical Code), LED drivers should be paired with LEDs that use 20% less than their maximum rated wattage (with the exception of AC LED drivers). Drivers should not be paired with an LED that is at or exceeds the driver’s maximum wattage to avoid overstressing the driver components. For example, if you have a driver that can operate a maximum of 96 watts, it should only operate LEDs that use 77 watts at most (96 x 0.8 = 76.8).

How to determine power factor of LED?

It is calculated by dividing the power being used by the driver (wattage) divided by the product of the input voltage times the current going in (volts x amps). The range for power factor is a decimal between 0 and 1. The closer to 1 the power factor is, the more efficient the driver is. A good power factor is 0.9 or above.

Can LEDs be dimmed?

If the specs don’ t mention dimming at all, it is safe to assume that the product is not dimmable. Dimmable external drivers often require an external dimmer, or other dimming control devices specified on the product datasheet (namely TRIAC, Trailing Edge, or 1-10v dimmers) to work. Since technologies are improving rapidly, it’s best to test specific LED/dimmable driver combinations for acceptable dimming performance before making large purchases if brand-specific dimmer compatibility charts are not available.

Do LED lights need a driver?

For the aforementioned reasons, every LED light source requires a driver. However, some LEDs, particularly those designed for household use, contain internal drivers rather than separate, external drivers. Household bulbs usually include an internal driver because it makes replacing old incandescent or CFL bulbs easier. These include LED bulbs with standard screw-in or plug-in bases (E26 / E27 or GU24 / GU10 – see images below) or those that specify a line-voltage (120 volts) input on their datasheet. LEDs that typically require an external driver include cove lights, downlights, and tape lights, as well as certain fixtures, panels, and outdoor-rated lights. These bulbs are often used for commercial, outdoor, or roadway lighting purposes. They typically require a separate driver because it’s simpler and cheaper to replace the driver than the LEDs. Sometimes, LEDs will come equipped with a separate driver. Other times, manufacturer datasheets will specify whether or not an LED requires a separate driver, along with the type of driver it requires if necessary.

Do LEDs need constant current drivers?

Yes, in that they both regulate current. However, if you use a resistor, the current will slowly continue to rise over time. Constant-current drivers are preferable because they are more consistent, efficient, and flexible, especially for high-power LEDs.

What is the color of LEDs?

Aluminium alloys are used to obtain red, orange and yellow light, and indium alloys are used to get green, blue and white light. Slight changes in the composition of these alloys change the colour of the emitted light.

What is LED?

A light-emitting diode (LED) is a semiconductor device that emits light when an electric current flows through it. When current passes through an LED, the electrons recombine with holes emitting light in the process. LEDs allow the current to flow in the forward direction and blocks the current in the reverse direction.

How is energy released in light emitting diodes?

The energy is released in the form of photons on recombination. In standard diodes, the energy is released in the form of heat. But in light-emitting diodes, the energy is released in the form of photons. We call this phenomenon electroluminescence. Electroluminescence is an optical phenomenon, and electrical phenomenon where a material emits light in response to an electric current passed through it. As the forward voltage increases, the intensity of the light increases and reaches a maximum.

What is the drop in voltage of LED?

Light Emitting Diode Circuit. The LEDs also have a specific drop in voltage forward in cases where it is used typical circuits like a conventional diode. The drop in voltage depends on the current of the LED, the color of the produced light , etc.

How do LEDs work?

LEDs work on the principle of Electroluminescence. On passing a current through the diode, minority charge carriers and majority charge carriers recombine at the junction . On recombination, energy is released in the form of photons. As the forward voltage increases, the intensity of the light increases and reaches a maximum.

What is a light emitting diode?

A light-emitting diode (LED) is a semiconductor device that emits light when an electric current flows through it.

What are LEDs used for?

LEDs find applications in various fields, including optical communication, alarm and security systems, remote-controlled operations, robotics, etc. It finds usage in many such areas because of its long-lasting capability, low power requirements, swift response time, and fast switching capabilities. Below are a few standards LED uses: 1 Used for TV back-lighting 2 Used in displays 3 Used in automotives 4 LEDs used in the dimming of lights

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