UL 1310, Class 2 Power Units (2022)

81-89Info

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81InfoGeneral81.1The requirements in Sections 81 – 89 apply to a flush device cover plate with integral power supply with Class 2 output connector(s) with or without a night light. These devices shall comply with the applicable requirements of this Standard except as modified by the requirements in Sections 81 – 89.81.2These requirements are applicable to flush-type, parallel blade construction of the ANSI/NEMA 1-15R or 5-15R configurations only. These requirements do not cover products incorporating a flush device cover plate with connection means other than plug blades.81.3These requirements are applicable only to non-metallic flush device cover plates that are intended for indoor use only.82InfoConstruction82.1In addition to the construction, performance, and marking requirements contained in this Standard, a flush device cover plate with integral power supply with one or more Class 2 output low-voltage connectors with or without a night light shall comply with the applicable requirements of the Standard for Cover Plates for Flush-Mounted Wiring Devices, UL 514D.82.2The flush device cover plate profile shall not hinder the complete seating of an attachment plug of the type intended for use with the receptacle.82.3A flush device cover plate with integral power supply with one or more Class 2 output low-voltage connectors with a night light shall also comply with the applicable requirements of the Standard for Direct Plug-In Nightlights, UL 1786.82.4The Class 2 low-voltage output connectors of a flush device cover plate with integral power supply with one or more Class 2 output low-voltage connectors with or without a night light shall be insulated and extend beyond the plane of the receptacle mounting yoke and be accessible when the cover plate is installed as intended.82.5The Class 2 low-voltage power supply shall be configured for supply from a single branch circuit receptacle.82.6

A flush device cover plate with integral power supply with one or more Class 2 output low-voltage connectors with or without a night light intended for installation requiring the removal of a receptacle cover plate shall comply with the following:

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  1. The device shall be able to be fully inserted in the outlets; and
  2. The device shall be able to be fully seated against the wall such that the outlet box opening in the wall is completely covered.
83InfoPolymeric Enclosures83.1In addition to the insulating material requirements of the Standard for Cover Plates for Flush-Mounted Wiring Devices, UL 514D, a polymeric material used to enclose the power unit circuitry shall have a flame rating not less than 5V, in accordance with the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, or comply with the 127 mm Flame Test specified in the Standard for Polymeric Material – Use in Electrical Equipment Evaluations, UL 746C.84InfoSpacings84.1A flush device cover plate with integral power supply with one or more Class 2 output low-voltage connectors shall maintain a minimum of a 1/4 inch (6.35mm) separation of branch circuit wiring and Class 2 connections after installation. Compliance shall be determined by measurement and if required, the Assembly Test in Section 87.84.2Class 2 output low-voltage connectors shall be located as to prevent a line blade of an attachment plug from being improperly inserted into the Class 2 output low-voltage connector (i.e. USB) slot and the line contacts of a receptacle. Compliance shall be determined by inspection and if required, the Assembly Test in Section 87.85InfoConfigurations85.1The device shall comply with the cover plate dimensions as specified in Wiring Devices –Dimensional Specifications, NEMA WD 6, intended to accommodate the intended flush-mounted wiring device.85.2The blade portion of the device shall comply with the NEMA 1-15P or 5-15P blade dimensions specified in Wiring Devices – Dimensional Specifications, NEMA WD 6.86InfoClass 2 Output Power Supply Testing86.1

For all testing to this Standard, except for the Assembly Test in Section 87, the device is to be energized from a duplex receptacle wired to a source of supply as intended. The duplex receptacle is to be mounted in a non-metallic outlet box test wall according to Figure 86.1. The outlet box is to be mounted in a vertical wall section as follows:

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  1. With plywood or gypsum wallboard surfaces; and
  2. Loosely filled with fiberglass or equivalent thermal insulation.
86.2

Under any condition of low voltage output loading, individually or collectively, tests are to be conducted to represent the worst case of:

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  1. No load on the branch circuit receptacle outlet; and
  2. Full load from the branch circuit receptacle outlet.
87InfoAssembly Test87.1

A flush device cover plate with integral power supply with one or more Class 2 output low-voltage connectors with or without a night light shall comply with all of the following:

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  1. Maintain a minimum of a 1/4 inch (6.35 mm) separation of branch circuit wiring and Class 2 connections;
  2. Not permit contact to be made between the probes shown in Figure 16.1, Figure 16.2, or Figure 16.4 and any live part through the Class 2 output connectors or through any opening or joint surrounding the installed device; and
  3. Not permit contact to be made between the Class 2 output connector and receptacle line contacts with a NEMA 1-15P attachment plug.
87.2The device is to be checked for compliance with 87.1(a). Following assembly of the test setup shown in Figure 86.1, the device is to be checked for compliance with 87.1(b). The probes of Figure 16.1, Figure 16.2, or Figure 16.4 are to be applied to any opening or joint surrounding the Class 2 output and through the Class 2 output connector slot openings with a force of 8 ounces (2.2 N) in attempt to contact live parts. A suitable indicating device (such as an ohmmeter, battery-and-buzzer combination, or similar device) is to be connected between the probe and the wiring terminal of the receptacle to determine whether contact is made. The probes are to be inserted in the Class 2 output connector slot opening successively in three directions in any orientation that may permit access to contact live parts. The probes are to be applied for approximately 5 seconds in each of the three directions. During each application, the probes are not to be moved or rotated and are to be withdrawn when moving from one direction to the next.87.3

The same representative assembly as described in 87.2 is to be checked for compliance with 87.1(c), using a NEMA 1-15P polarized attachment plug. One blade is to be inserted into the slot openings of the Class 2 output connector and the other blade into the slot openings of the receptacle contacts with

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a force of 10 pounds (45 N) in an attempt to contact live parts. A suitable indicating device (such as an ohmmeter, battery-and-buzzer combination, or similar device) is to be connected between the Class 2 output connector and the contacts of the receptacle to determine whether contact is made. The attachment plug is to be manipulated in any direction or orientation that may permit access to contact live parts. The attachment plug is to be applied for approximately 5 seconds in each direction.

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88InfoInstallation Instructions88.1Installation instructions shall appear on the device, on the smallest unit container, or on a separate instruction sheet provided with each device. If the installation instructions are provided on the smallest unit container or on a separate sheet, they shall be attached to the device in such a manner that they are unable to become detached during normal conditions of handling and storage prior to initial installation or usage. The use of an individual carton, blister pack, or equivalent securing of the device to the instructions, meets the intent of the requirement. However, friction attachment shall not be employed.88.2A device intended for installation with receptacle cover plate or cover plate screw removed shall be provided with detailed installation instructions to enable proper installation of the device with the cover plate removed. The inclusion of a pictorial representation is optional.88.3A device intended for installation over receptacle cover plates of specific dimensions shall be provided with installation instructions that describe the maximum overall dimensions of the receptacle cover plate with which the device is intended to be used.88.4A device having blade spacing not in accordance with the Standard for Current Taps and Adapters, UL 498A, Figure 9.1 – Blade and Contact Spacing, shall be provided with installation instructions that specify, by catalog number or equivalent designation, the receptacles with which the device is to be used.88.5Instructions shall include information to alert the user that a single branch circuit shall supply the device. The instructions shall include a pictorial or photograph illustrating proper installation.89InfoMarkings89.1The output Class 2 connectors shall be marked as being “Class 2” and marked with the output electrical rating. These markings shall be permanently marked and visible after installation.

FAQs

What is a UL 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 is a Class 2 power unit? ›

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 maximum voltage a Class 2 circuit can handle? ›

The maximum circuit voltage is 30VAC and 60VDC for a Class 2 power source limited by overcurrent protection, and 150VAC or VDC for a Class 3 power source limited by overcurrent protection.

What voltage is a Class 2 transformer? ›

Class 2 transformers: Maximum 30Vrms, (42.4V peak), maximum power is 100VA.

Are all Class 2 power supplies the same? ›

For a power supply to be considered Class II, which is different from Class 2, it needs to follow the design laid out by the IEC (International Electrotechnical Commission). This code is necessary to protect the user from electrical shock.

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.

Is Class 2 the same as double insulated? ›

A Class II or double insulated electrical appliance uses reinforced protective insulation in addition to basic insulation. Hence, it has been designed in such a way that it does not require a safety connection to electrical earth (ground).

What is the difference between a Class 1 and Class 2 circuit? ›

Class 1 is regular power wiring using one or more of the wiring methods provided, listed, in chapter 3, the NEC 300's. Class 2 or 3 is an article 725 wiring method for power limited building control wiring, allowing the more fragile wiring methods of art 725 (CL 2 cable) and exceptions from the requirements of chap 3.

What does Protection Class II mean? ›

Class II - where user protection from electric shock is achieved through two levels of insulation (either double or reinforced), without the need for earthing. Class III - where the input is connected to a safety extra-low voltage (SELV) circuit meaning no further protection, such as earthing, is required.

What is an example of a Class 2 circuit? ›

A common example of Class 2 circuitry in your home is the doorbell wiring and associated transformer. The doorbell button on the front and rear of your home is a switch, opening and closing the connection between two low-voltage conductors, as you press the button.

Does a Class 2 wiring need a box? ›

Splices made in Class 2 cables must be in a box.

Does Class 2 wiring require conduit? ›

Class 2 circuits are limited to 100 Watts of power per circuit, do not require the cables to be housed in conduit and can be installed by DAS technicians rather than licensed electricians. To ensure compliance with the 100W limitation, the power distribution equipment employs active current limiting circuitry.

What does class 2 mean on a transformer? ›

Class 2 refers to a transformer that delivers 100VA or less with a maximum output voltage of 30VAC or less. Class 2 transformers are limited, either by inherent winding impedance or external fusing, to power levels considered safe enough to receive special consideration in safety requirement compliance.

What is a Class 2 transformer used for? ›

These transformers are used to reduce the risk of electric shock hazard, and may have equal input and output voltages, and are therefore used strictly for the safety isolation they provide.

What is a class two transformer used for? ›

Class 2 transformers have unique characteristics to enhance safety. Most notably, low secondary voltage to reduce electrical shock hazard and low power to reduce fire hazard.

What is a Class 2 product? ›

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. Examples of Class II appliances are hair dryers, DVD players, televisions, computers, and photocopiers. Class II appliances have two layers of insulation.

What is Class 2 low voltage wiring? ›

What Is NEC Class 2? - YouTube

What is the difference between Class 2 and Class 3 wiring? ›

Class 2 cables shall have a voltage rating of not less than 150 volts. Class 3 cables shall have a voltage rating of not less than 300 volts. Class 2 and Class 3 cables shall have a temperature rating of not less than 60°C (140°F).

Is a laptop charger Class 1 or 2? ›

Class I Power supplies used for IT equipment like monitors and laptops, are earthed for screening the electronics, not for electrical safety. Protection from electric shock is provided by double or reinforced insulation.

Can I run low voltage wire through wall? ›

You Can Safely Run Low Voltage and Other Cables in Bundles

You can bundle low-voltage cables together when running them. This makes it much easier when running them through walls. As long as the cables are well insulated, there should be no interference between any of the signals.

Do low voltage lights need to be grounded? ›

Low voltage systems are often ungrounded, which is normal, but non-current-carrying metal parts of equipment associated with low voltage systems are generally required to be grounded if the supply system is grounded.

What type of insulation does a class 2 product rely on? ›

In Class II equipment protection is achieved with double or reinforced insulation rather than reliance on a PE and basic insulation, either because a reliable PE is not available or for other system-specific reasons.

How do I know if my light is double insulated? ›

Double insulated lights are known as Class 11 or Class 2 light fittings and do not require an earth cable. In addition, there is also a logo for double insulated lighting which is a black square within a black square. This should appear on the packaging and instructions provided with the light.

How do you tell if an appliance is double insulated? ›

Double Insulated Appliances - Electrical Safety - GCSE Physics

What does an electrician do Class 2? ›

They install, test, and maintain wiring, lighting systems, and fixtures in homes and businesses.

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 Class 1 Class 2 and Class 3? ›

Jun 08, 2022. In electronics manufacturing, printed circuit boards are separated into three categories: 1, 2, and 3. The categories reflect the level of quality of each circuit board type, from lowest (Class 1 standards) to highest (Class 3 standards).

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

To PAT Test Class 1 Equipment an Earth Continuity test is required. These appliances do not require earth protection as these are protected by 2 layers of insulation ( Double Insulated ) . This makes the appliance safer and not require an earth. Most Class 2 equipment has a double box symbol on it.

Is double insulated equipment class 2? ›

These appliances are also referred to as having “double insulation” since in class II appliances a supplementary insulation is added to the basic insulation (see Figure F70).

What is class 2 Fe equipment? ›

A new class of equipment has been added, Class 2 FE (Functional Earth) to cover equipment that has electric shock protection by double or reinforced insulation; but requires a functional earth to operate correctly.

Can I use thermostat wire for low-voltage lighting? ›

Even if the supply is listed as Class 2 using small gauge wire such as thermostat wire is a bad idea. The voltage drop is going to greatly effect the lighting performance. There is 10 times as much current on a 12 volt lighting system as there is for the same system operating at 120 volts.

What is a Class 2 circuit breaker? ›

In the simplest terms, a Class 2 circuit is of such low voltage and current, and therefore low power, that it does not present a fire hazard or a shock hazard to personnel. Designs that ensure available energy is limited have many engineering, regulatory, installation, and operational benefits.

Is it okay to splice low-voltage wire? ›

You can splice low voltage wires with solder and electrical tape or with various connectors or splicing kits. Choose your connecting method depending on the type of cable, the voltage and the current.

Is it permitted to install Class 2 wiring in the same raceway or enclosure as electric light and power wiring? ›

1. For example, you can install Class 2 and 3 circuits in the same enclosure as electric light, power, Class 1, and nonpower-limited fire alarm circuits if they are separated by a barrier (Fig. 2). Combinations Listed Class 2 cables have 150V insulation, whereas listed Class 3 cables are rated 300V [725.82(G)].

Does low-voltage need a box? ›

It is not required, but it can be a good idea. Personally, I would prefer them to be in conduit (e.g. ENT/smurf tube) with splices in junction boxes. Just like with electrical wires, it will protect them from damage while providing accessibility for splices.

What can you do with low-voltage wiring? ›

Low voltage wiring is often used for Smart doorbells, telephones, garage door opener controls, heating and cooling thermostats, landscape lighting, alarm system sensors and controls (security system cameras, motion sensors), audio-visual wiring (surround sound audio systems, cable television, intercom systems), ...

Where shall the over current devices be located for a Class 2 system? ›

Rule 16-208 requires the overcurrent device to be located where the Class 2 conductor receives its supply.

What is a Class 2 conductor? ›

Conductors are divided into 4 categories for the purpose of use; Class 1: Solid conductors, Class 2: Stranded conductors, Class 5: Flexible conductors, Class 6: Conductors with flexibility more than Class 5.

Which of the following is an approved wiring method in any class 2 location? ›

As noted in Sec. 502.10(B)(1)(2), the following wiring methods shall be permitted: "rigid metal conduit, intermediate metal conduit, electrical metallic tubing, dusttight wireways."

What is a UL power adapter? ›

What is a UL-certified AC adapter? A UL-certified AC adapter bears an authorized UL Mark. This means it has been evaluated and meets the appropriate Standard for Safety. These adapters comply with UL safety requirements for the US.

What is a Class 2 transformer used for? ›

These transformers are used to reduce the risk of electric shock hazard, and may have equal input and output voltages, and are therefore used strictly for the safety isolation they provide.

What is UL listed PSU? ›

What Are UL-Listed Devices? When a product is UL-listed, it means that the global safety certification company UL has confirmed that the the product is safe for use. Products that should definitely be UL-listed before installation in your home include fixed appliances and electrical equipment.

What is a Class 2 air filter? ›

Class 2 Air Filters – Those that, when clean, burn moderately when attacked by flame or emit moderate amounts of smoke or both.

Is Anker UL listed? ›

Anker Power Strip Surge Protector, 12 Outlets, 10 ft Extension Cord, 1875W Output for Computer,Desktop Accessory, Laptop & Phone,Multiple Charging Station for Home, Office (2×4000 Joules),UL Listed.

What is a UL listed product? ›

UL Listing means that UL has tested representative samples of a product and determined that the product meets specific, defined requirements. These requirements are often based on UL's published and nationally recognized Standards for Safety.

What does an EU adapter look like? ›

They consist of a 9 mm long conductive tip of 4 mm diameter with a rounded ending, followed by a 10 mm long flexible insulated shaft of not more than 3.8 mm diameter. The two pins are not exactly parallel and converge slightly; their centres are 17.5 mm apart at the tip and 18.6 mm apart at the base.

What is the difference between Class 1 and Class 2 transformers? ›

Class I units are insulated and protected by an earth terminal. Class II transformers have double insulation or reinforced insulation. Class III transformers have outputs at Safety Extra-Low Voltages (SELV) below 50 V ac or 120 V dc.

What is Class 2 low voltage wiring? ›

What Is NEC Class 2? - YouTube

What is a Class 2 or 3 transformer? ›

A Class 2 or Class 3 transformer that is inherently limited has an impedance within the transformer that limits the current output to a particular maximum value. It may or may not be provided with a thermostat or other temperature sensitive device to limit its maximum temperature.

How important is UL certification? ›

UL Recognition ensures the safety and efficiency of machinery used by workers. It also empowers companies to strive for more sustainable practices. Because UL Recognized focuses on components, UL ensures that the equipment is properly housed.

Is UL certification mandatory? ›

There is no law in the U.S. requiring UL certification. But commercial building and electrical codes as well as retailers may require it. And if you produce a product designed to meet specific safety criteria or it might pose a safety risk, you definitely need testing.

Is UL Listed necessary? ›

Having a UL listed certified unit is not legally required. It is, however, a common practice because many large companies will only buy equipment that has passed the UL safety tests.

What MERV is best for home? ›

In general, the best MERV rating for a home is somewhere between 8-10. These filters will capture a large portion of the airborne particles and improve indoor air quality without making your energy costs rise significantly.

Is MERV 8 good enough? ›

But is it enough filtration? In many cases, a MERV 8 air filter is more than adequate. However, if you are worried about outdoor air pollution, family members with respiratory issues, pets are in the home, then going with a higher MERV rating might be a good idea.

Are high MERV filters bad for furnace? ›

While the highest MERV ratings are the most effective for air quality, they can harm your HVAC system. A higher MERV rating means a higher resistance, which means less airflow. When researching HVAC systems, airflow will come up a lot.

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