UL Rating Lights Guide: Everything You Need To Know (2023)

Let’s face it:

We both know that water and electricity are two rivals that cannot coexist.

And in the event of them coming into contact, several hazards are posed including:

  • Damaging of the electrical appliance.
  • A fire outbreak.
  • Or dreadful enough, electrocuting a person or pet.

For those reasons:

It isn’t so safe to setup lighting fixtures in areas that are exposed to water or moisture.

But:

We still need light anyway.

Even though the bathroom is a hotbed of steam and sprinkling water, you can’t take a bath in darkness because it might lead to other hazards.

Similarly, when performing kitchen chores, you’re going to need ample lighting.

Well:

That’s where UL rating lightscome into play.

I know you might have bumped into a ‘UL Rated’badge on your bulb and wondered what it meant.

Actually, this badge should be the number one consideration when purchasing a bulb.

And if your current bulbs lack the UL rating badge, it might be time to get new ones.

Why?

Well, that question is what prompted me to write this post.

Do you want to learn more about UL rating lights?

I guess you do.

So, stick with me till the end and I’ll tell you everything you need to know about this lighting standard.

Without further ado, let’s get started…

UL Rating Lights Guide: Everything You Need To Know (1)

Table of Contents

Chapter 1: What is UL?

Now:

Before we dive deep into the details, let’s first learn the basics.

So, what do the two letters stand for?

In full, UL stands for Underwriters Laboratories;which is an independent organization concerned with the general safety of the public.

This company is dedicated to product testing and certification; also, setting the standards and regulations for different products.

In our case:

They test bulbs and lighting fixtures to make sure they won’t malfunction and cause fire or other hazards.

And although all bulbs are not UL certified, Underwriters Laboratories sets the compliance standards which all manufacturers must adhere to.

Therefore, most bulbs are generally safe to use.

Well:

That’s it about UL and what they do. With that basic information, we can now jump into the complexities.

So:

You have come across that ‘UL rated’ seal on your bulb and are probably wondering:

What’s the meaning behind the seal? What role does it play? Or is it just for decorative purposes?

Of course, it’s not for beauty.

Here’s all you need to know about the seal:

Chapter 2: What does UL Rated mean?

As aforementioned:

Before any lighting (electronic) product is released for consumption by the general public, it has to pass through Underwriters Laboratories for testing.

Now:

It is only after UL has approved it and declared it safe for usethat it can be availed in the market.

A product with a ‘UL rated’seal has been tested by the UL and has passed the safety requirements.

So, whenever you see this seal on any product, be it food, beverages, or electronics, it simply means that it is certified.

Basically:

The seal is an affirmation that you can enjoy the product without any worries.

Well:

Since we now know what that ‘UL rated’ seal means, we can narrow down to our area of interest: UL rating lights.

So:

Chapter 3: What is UL Rating for Light Fixtures?

Get this:

Although some may refer to it as UL listing, both terms have a similar meaning.

Since we require bulbs for different locations – that is, dry, damp and wet areas – UL does not only test them; they also indicate the locations the bulbs are suitable for use.

So again:

When purchasing a UL light, consider first the area you are going to use the bulb.

Is it dry, damp, or wet?

That should guide you on the UL rating, or rather ‘UL rated’ seal to go for.

Here are the three UL ratings for light fixtures:

1. UL Rated For Dry Locations

Note:

UL-rated bulbs for dry locations are the most common.

As the name suggests, these bulbs are typically meant to only be used indoors.

So, how do you know whether a bulb is listed for dry locations?

Well:

The UL rating information is always stamped on the box that the bulb comes with.

And:

To know whether the bulb is rated for dry locations, look for a ‘yes’ on the seal.

If it’s there, your bulb can’t be exposed to water or any sort of moisture.

Why?

These bulbs are, generally, ‘allergic’ to dampness which could lead to them cracking or getting damaged.

However, this doesn’t mean that they should not be exposed to the slightest moisture; because temporary dampness can’t do any harm to these lamps.

What’s important is good ventilation.

According to an article by Underwriters Laboratory, the purpose of ventilation is to prevent the build-up of moisture at the luminaire.

Simply put:

Proper ventilation gets rid of moisture from the area; therefore, it is vital in dry-rated areas.

The following are the dry locations in your home:

  • Living room,
  • Dining room,
  • Bedroom,
  • Study room,
  • Office,
  • Foyer
  • And hallway.

However:

It is important to note that some bulbs don’t have a ‘yes’ on the seal.

Sometimes, it’s a ‘no’.

So, what about them?

Okay, this doesn’t necessarily mean that they aren’t safe to use.

But it might imply that the bulb isn’t tested by Underwriters Laboratories; or rather, its location of use isn’t specified.

Remember:

UL sets the standards of manufacturing and testing in the lighting industry and the manufacturers have adhered to those regulations. Such a bulb can, therefore, be used in dry locations.

Other UL-listed lighting fixtures don’t specify the location of use, but you can also use them indoors or in areas that are not prone to moisture.

But:

What if the area you want to light up is subject to condensation of moisture?

Well:

That takes us to the next category of UL listings.

And that is:

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2. UL Rated for Damp Locations

Okay:

Let’s begin from the bottom.

What’s the difference between wetness and dampness?

Here’s a good answer:

Wetness is the condition of being watery while dampness refers to moderate humidity.

That’s literally saying that dampness is a lite version of wetness.

Therefore:

Damp locations are areas where water doesn’t directly splash on the lighting fixture.

These include the kitchen, bathrooms, and other areas with sinks and water faucets.

Even though there isn’t direct contact between water and the lamp, there is moisture accumulation which isn’t good for typical bulbs.

Given that condition:

Only use a lighting fixture with a UL listing for damp locations for such an area. Those lamps are labeled on the packaging box as ‘Suitable for Damp Locations’.

They can be used indoors or outdoors and are particularly effective for humid and muggy areas.

However:

Make sure that they don’t come into direct contact with water.

Reason being:

These light fixtures can withstand moisture but not water.

If you are using them near bathtubs, showers, or faucets, it is recommended that you shield them with water safe fixtures. These measures will prevent direct contact.

In general:

UL lights rated for damp locations are suitable for the following outdoor areas:

  • Patios,
  • Covered walk paths,
  • Verandas
  • And covered porches.

And, last but not least, we have:

3. UL Rated for Wet Locations

A lot of the times:

It’s fascinating to see a heavy downpour of water splashing on a lamp yet it doesn’t grind to a halt.

Isn’t it?

So:

How do you know a light bulb is rated for wet locations?

Well:

It is labeled as ‘Suitable for wet locations’.

These UL rating lights are designed to be durable and withstand rain and intense wetness.

Or, in other words, they are stiff and are not shaken by the harshest of weather. They can get in direct contact with water or other splashing liquids and still keep lighting up the place.

For that reason, they are the safest bet for outdoor use.

They can, as well, be used as substitutes for damp listed lamps.

Note:

This doesn’t mean that they can’t be used indoors though. Sometimes, these fixtures often work well for lighting a living room, bedroom, study room, office, or any other indoor location.

However:

Due to their lighting environments, these UL-listed lights tend to collect a lot of water or other sprinkling liquids over time.

Therefore, it is recommended that you wipe them often so that they can give out light to the maximum.

All in all:

They are ideal for:

  • Enclosed showers,
  • Open-air decks,
  • Patios,
  • Gazebos,
  • Uncovered porches,
  • Exterior walls
  • And walkways.

What else?

A Pro Tip:

For those using wet location bulbs outdoors, it is advised that you use a lighting fixture or an outdoor wall sconce. This will noticeably boost the longevity of your UL light.

Moving on…

Chapter 4: What Is a UL Light?

So:

Now that we know what UL stands for and how it works, understanding what a UL light is as easy as counting 1.2.3!

Simply put:

A UL light is a bulb that has been tested by Underwriters Laboratory and declared safe for use by consumers. If a light fixture has the ‘UL rated’ seal, it can be referred to as a UL light.

That is not all.

UL lights are also further rated in the following ways:

  • UL listed for dry locations
  • For damp locations
  • For wet locations

These listings and ratings make UL lights the best bid in the market.

Depending on the location you want to put the bulb, you can use the listings to pick the best fit; so, whenever you are purchasing a lighting fixture, check for the ‘UL rated’ stamp.

Now:

I know you might be asking yourself?

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Chapter 5: What Is the Difference Between UL Certified and UL Listed?

Let’s face it.

We both by now know that UL certifies products, including bulbs, with the aim of making the world safer.

Moreover, we know that products that have passed the UL test acquire the ‘UL rated’ seal.

But:

What does the term UL certified imply?

UL Rating Lights Guide: Everything You Need To Know (2)

a) UL Certified

Well, it’s as easy as it sounds.

A UL certified product meets the set standards and regulations by the Underwriters Laboratory.

To give that seal, they (UL LLC) continually test the product to ensure it is up to the standards.

Some of the things they test include the wire sizes to ensure they carry the claimed current without hitches.

Now:

Since they also ensure that products are correctly constructed, UL certified products are 100% safe.

However, Underwriters Laboratories does not test all products themselves.

Sometimes:

They allow the manufacturers to test the products with the UL seal.

Nevertheless, they regularly follow up to ensure the manufacturer is testing and adhering to the guidelines.

b) UL Listed

On the other hand:

A product that is UL Listed has undergone more tests than a certified one.

Listing involves thorough testing of a specific product to recognize its safety and sustainability standards nationally.

Basically:

UL listed products are free of all faults and hazards; and are also durableif used under normal conditions.

Also, when UL lists products, it recommends them for certain purposes.

For example:

In the case of lighting fixtures, they recommend bulbs as either fit for dry, damp, or wet locations.

Get it?

Anyway, a lot of people often ask:

Chapter 6: Does The U.S. Require UL Approval?

Now:

We know that UL certification is important as it affirms that a product is safe to use and has met the set standards.

One fun fact is that most customers will be attracted to your product due to that circular ‘UL’ mark/seal.

Why?

It’s because the certification seal brings prestige to the product and makes it feel certified and legal.

Don’t you agree?

However, one dominant misconception in the wire and cable industry is that UL certification is a must.

The truth is:

Underwriters Laboratories is one of the many agencies that can be utilized to do the US government’s standardized testing.

Other testing companies include:

  • Electrical Testing Laboratories (ETL)
  • Factory Mutual (FM)

… Whose standards are very similar to UL’s.

Get this:

UL is more popular because they’ve been around for over a century and have established a sturdy reputation; similar to how some phone brands are more trusted than others because they’ve been in the industry for long.

Does it make sense now?

That said:

Your product doesn’t need to undergo UL testing.

You can go for other testing agencies which will also test your product and label it as safe for use or consumption.

All the same, as a marketing strategy, go for UL certification; people are, generally, attracted to UL-rated products.

So:

You have learned a lot about UL and certification and probably want your product to be UL certified. If so, you are probably wondering:

Chapter 7: How Do You Get UL Certification?

Fun fact:

Years ago before the world was made a global village by the internet, you had to physically visit UL offices.

But:

In today’s digital era, you can get certified from the comfort of your office or home.

Awesome, right?

So, let me break down the process for you in four simple steps:

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Step 1: Initiate the Certification Process

Begin by visiting the Underwriters Laboratories, Inc. website.

Then:

Click on the ‘Contact us’section on the website. This will lead you to the links and forms related to the submission of a product sample for testing by UL.

Step 2: Submit a Sample of the Targeted Product

Here, you’ll be required to ship a sample product to UL.

Note:

The shipping and handling costs are to be paid by the organization requesting testing (You). Also, use a well-established shipping company to ensure that the product reaches UL Labs undamaged.

Step 3: Wait For the Tests to Complete

Now:

Once UL receives the product sample, they will begin running tests and evaluating it for safety; while ensuringthat the product is up to OSHA and ANSI standards.

After successful testing, UL will decide on whether to label your product as compliant with its standards and regulationsor not.

Bear in mind:

A rejected product needs to be remanufactured or stay uncertified. Also, UL charges a fee to run tests on a product.

Step 4: Receive Your Certification

If the product is in compliance with OSHA and ANSI standards, UL issues a certificate to the manufacturer.

Moreover, they will authorize the placement of their stampon all products manufactured as per the sample product tested.

Note:

The UL stamp is also an affirmation that the product has been tested and meets OSHA and ANSI standards.

Also:

UL representatives will pay regular visits to the manufacturers to make sure they remain in compliance with the UL standards.

And that’s that.

Simple, right?

Anyway:

The last question needing an answer is:

Chapter 7: Where Or How Do I Get A UL Light Fixture?

It’s a fact:

Distinguishing between a light fixture that’s UL certified and one that’s not is easy.

Therefore:

Getting a UL certified light doesn’t have to be a challenge; just look out for the UL logo on the box.

  • If it exists, the lamp is a UL light fixture.
  • If not, the fixture may not be certified and is potentially dangerous.

The decision to take it or leave it is, however, yours.

Now:

Underwriters Laboratory has become so recognized that – last year alone – around 14 billion products with the UL seal entered the global market.

Thus, most of the light fixtures you’ll come across today are probably UL certified.

But, to make it easier for you…

Here are some of the best UL certified LED fixtures you can buy today:

1. Parkade Indoor Garage Lights

Without a doubt:

The ShineLong Parkade Garage Lightscould be your next big thing if your number one preference is safety.

It goes without saying that they are UL certified and free of any hazards. Besides that, they have a high luminous flux, are strong and energy-efficient as well.

Moreover, these fixtures have a durability of up to 75,000 hours. That’s equivalent to 8 years of uninterrupted lighting.

2. Rancher LEDs

The ShineLong LED Rancheris, indeed, a one of a kind lighting fixture.

You will find it helpful if you’re looking to light up a:

  • Shed,
  • Barn,
  • Farmhouse
  • Or poultry house.

It boasts of having a UL certification and features an IP69K-IK10 protection rating.

This means that it can withstand vapor, water, and even dust.

And:

Even when the Rancher encounters sudden impact, its sturdy exterior keeps the internal parts from breaking or damage. It’s, therefore, very robust and durable.

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3. Gauls IP68 Tubular Light

Looking for high-quality, farmhouse LEDs? Try the ShineLong Gauls LED Lights.

Here’s another perfect fit for poultry sheds, farmhouses, petrol stations, garages, warehouses,and so on.

Most importantly, it is a UL-certified fixture deemed safe and danger-free.

You’ll be impressed by its cylinder design and stiff PC/PMMA materialsthat shield against ammonia corrosion.

Moreover, it’s waterproof, vapor-proof, and dustproof.

And as for the durability, it lasts a good 75,000 hours.

Awesome, right?

4. Alpha LEDs

Get this:

The ShineLong Alphais ideal for large indoor areas such as dining halls, churches, indoor sports arenas, and so on.

Reason being:

They are strong and have a high luminous flux.

And since safety matters a big deal when it comes to lighting, they are waterproof, vapor-proof, dust-proof, and also impact resistant.

5. Slice US Panel Lights

Lastly:

For the best and safest office and school LEDs, try the ShineLong Slice US Panels.

Now:

Just like any other good UL lights, these ones are safe and won’t lead to fires or any other hazards.

Besides that, they have an elegant design, have high luminous flux,and are durable. They also feature a #6063 aluminum frame, PMMA plastic,and alloys that prevent external damagewhile slowing corrosion and aging.

Anyway:

There are so many other fixtures you can choose from with UL certifications.

These are just a few of the best on the market.

In Conclusion…

There you have it.

At least, you know a lot more than you did earlier.

By now:

You know just about everything there is to know about UL ratings, listings, and certifications.

So, next time, while buying a lamp, be sure to check for the stamp. Also, check the UL listings to get the perfect lamp for dry, damp, and wet locations.

Was this post helpful? Did it answer your questions?

If not, feel free to drop your questions and thoughts in the comment section.

I’d love to hear from you.

Share this story!

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FAQs

What is a UL rating on a light? ›

This marking, known as a UL listing, means the product has been tested by Underwriters Laboratories for fire safety and electrical safety. A UL lighting fixture is labeled to indicate the product has passed the specific safety requirements necessary to be used by consumers in their homes and in places of business.

What are UL guidelines? ›

UL Standards are used to assess products; test components, materials, systems and performance; and evaluate environmentally sustainable products, renewable energies, food and water products, recycling systems and other innovative technologies.

Do LED lights need to be UL listed? ›

In other words, LED strip lights must be listed (UL/ETL or otherwise) as a part of a listed lighting system (e.g. LED strip lighting kit), or listed separately as one of the components of an assembled system.

How do you read UL ratings? ›

The UL rating is broken down into Class A and Class B:C ratings. The number beside the letter A ranges from 1 to 40. This is the water equivalency for this extinguisher, where 1 equals 1¼ gallons. For example, 4A means the fire extinguisher is as effective as 5 gallons of water.

What do UL numbers mean? ›

The UL-Listing seal, also known as the “Underwriters Laboratory” seal, that is stamped on most electrical products is an important mark that products carry. It used to be an insurance industry organization, but now it is independent, non-profit organization.

How important is the UL rating? ›

When you're out shopping for electrical devices and supplies for your home project, UL listing is the best way to ensure you're getting safe, properly designed and manufactured products. A product that bears the stamp of UL listing has been tested and verified that it meets UL standards for safety.

How long is UL certification? ›

It might take around 6 months to get it if the electronic device was designed according to the technical requirements applicable to the UL certification standards.

How important is UL certification? ›

UL certifies products with the intent to make the world safer for consumers and workers. Along with product safety testing, UL sets the industry standards for companies to follow during the process of innovating new products.

How can I view UL standards for free? ›

Answer: By visiting our UL Standards site, you will be able to view over 1400 UL Standards. Start with this link https://standardscatalog.ul.com/ and follow the screenshots below: If you are searching for a certain standard insert the number in the search box.

How do I find my UL number? ›

Any "UL File Number" can be retrieved on the base of an UL account which grants access to UL's database. The data base sheet (formerly called "Yellow card") of a concrete "UL File Number" present by the UL's data base holds the information about the manufacturer, the product, and the fulfilled UL standards.

What products must be UL Listed? ›

Appliances, smart devices, furniture, home construction material, and fire and carbon monoxide detectors all bear the Mark. This means the marked product “has been certified to meet scientific safety, quality, or security standards.”

Are non UL lights safe? ›

In our case: They test bulbs and lighting fixtures to make sure they won't malfunction and cause fire or other hazards. And although all bulbs are not UL certified, Underwriters Laboratories sets the compliance standards which all manufacturers must adhere to. Therefore, most bulbs are generally safe to use.

Is UL mandatory? ›

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.

Does UL Listed mean anything? ›

As officially defined by UL, the UL Listed mark signifies “that UL has tested representative samples of a product and determined that the product meets specifically defined requirements.” UL Listed is the most common type of UL mark, and it's the one that you'll find on Polycase enclosures.

What is UL range? ›

Our ranges meet all standards set by the Underwriters Laboratories (UL). UL evaluates external temperature limitations for ranges. The front and sides of a range can vary from 152 to 212 degrees F., depending on the materials.

How many UL standards are there? ›

Since 1903, UL has been creating Standards for product safety. With over 1,000 Standards available for delivery in hardcopy, PDF, or electronic HTML formats, if you're looking for a UL Standard you've come to the right place.

What is UL and why is it important? ›

Underwriter Laboratories (UL) is one of the oldest safety certification companies around. They certify products, facilities, processes or systems based on industry-wide standards. By doing so, they issue over twenty different UL Certifications for a wide-range of categories.

How many exams can you repeat in UL? ›

Repeat exam criteria:

If you have completed only one academic semester in a current academic year, you are permitted to repeat a maximum of 2 modules from that semester. If you have completed two academic semesters, you are permitted to repeat a maximum of 4 modules.

Can you self certify for UL? ›

Yes, a self-declaration process! It is a common misconception that US NRTL approval is mandatory for sale in the US and Canada.

Do you need 3 languages for UL? ›

You must take 2 languages; you can take a third as an option. At least one language must be taken at the advanced level.

Do UL certificates expire? ›

There is no expiration to the UL Certification for a product bearing the UL Mark because the product complied with the requirements in effect at the time manufacture and the application of the Certification Mark.

Can you remove UL stickers? ›

Also, it is prohibited to remove UL labels from an existing sign and reapply to a different sign. Marking and installation requirements are located in both NEC Article 600 as well as UL 48.

Do electronics need to be UL certified? ›

UL certification is necessary in the United States and Canada if the product plugs directly into an AC outlet. Primarily the UL is concerned with the electrical safety of your product. This certification ensures that your product doesn't start an electrical fire, or cause other safety issues.

Where can I download UL standards? ›

Find the UL Standard you need in our catalog, access the Standards Certification Customer Library if you are a UL certification customer, or purchase a Standard from our sales site.

Where can I find UL standards? ›

Go directly to the UL Standards Sales Site to obtain the standard you need and to see What's New. UL's Collaborative Standards Development System provides free access to proposal and meeting information for UL Standards.

What is the difference between UL listed and UL certified? ›

UL Certified is a broader term that includes UL Listed, UL Recognized, as well as UL Classified (which simply means that the product has been tested for one specific standard, such as sustainability). The mark used on your product will depend on which UL certification it has received.

What are fake UL Listed products? ›

Any product that references UL on the carton or on the product itself but has no company name or address. Any product that references UL on the carton, but not on the product itself. Cheap, low quality workman- ship and/or packaging.

What is not UL approved? ›

Just because a product is not UL recognized and tested doesn't mean it's going to spontaneously combust. It simply means that its performance and safety haven't been tested independently and verified to meet those safety standards.

What are two types of UL certification? ›

What Are the Different Types of UL Ratings? There is no general UL certification. Instead, there are three different categories: UL Recognized, UL Listed and UL Classified.

What is the healthiest lighting? ›

But researchers' recommendations for creating a healthy lit environment are nonetheless straightforward: people should seek out bright light and blue light during the day, and minimize exposure to both at night.

What light source is the safest? ›

LEDs. As LEDs emit light outside the UV spectrum, these are much safer than arc and tungsten-halogen lamps as the emitted light will not cause discomfort or damage to eyes. LEDs also carry no risk of releasing toxic chemicals, making these the safest light source.

Does UL apply to low voltage? ›

The National Electric Code (NEC Section 411) requires that low voltage lighting equipment is UL listed for the purpose. This means that all electrical components (fixtures, wire, and transformers) carry UL Listings.

Is UL for USA only? ›

UL Recognized Component Mark

Just as with the UL Listing and Classified Marks, there are three variations of UL's Recognized Component Mark: one for the United States only, one for Canada only and one for both the United States and Canada. The C-UR Mark is applied to components only used in the Canadian market.

What does C on UL listing mean? ›

The optional C-UL-US mark indicates compliance with both Canadian and U.S. requirements. UL encourages those manufacturers with products certified for both countries to use this combined mark, but they may continue using separate UL marks for the United States and Canada.

What is the UL rating used for? ›

The UL Listed seal means that the product has been tested by UL to nationally recognized safety and sustainability standards. Additionally, it has been found to be free from a reasonably foreseeable risk of fire, electric shock in a Division 2 environment.

Does UL mean fire rated? ›

Underwriters Laboratories is the premier independent testing facility for fire ratings. Much like ISO certification or NQA-1 standards are a measure of quality and continual improvement, the U.L. certification is a standard of excellence in fire protection.

Are all lights UL Listed? ›

They test bulbs and lighting fixtures to make sure they won't malfunction and cause fire or other hazards. And although all bulbs are not UL certified, Underwriters Laboratories sets the compliance standards which all manufacturers must adhere to. Therefore, most bulbs are generally safe to use.

How long is a UL certification good for? ›

Pressure sensitive labels that are procured directly from UL have a 3 year expiration date. Manufacturers should have an inventory control system that ensures labels will not be utilized past this expiration date.

Is UL certification mandatory? ›

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 is a UL rated safe? ›

Safes that have been certified by Underwriters Laboratories represent the highest quality product and level of protection available for purchase. UL Rated Safes are rated according to resistance to entry attempts, protection against fire, and other standardized tests.

What is UL classification? ›

UL Classification typically means that UL Solutions has tested and evaluated samples of a product with respect to certain properties of the product. UL classifies products to: Applicable requirements. Standards of other organizations.

What is UL fire protection? ›

A product with an Underwriters Laboratories mark is said to be "UL Listed.” With fireproof safes and files, a UL listing specifies the standard of protection the fireproof container provides its contents when exposed to fire.

Do extension cords have to be UL Listed? ›

Whether it's a humble extension cord or a major appliance, here in the U.S., it should be UL, ETL, or CSA listed. When a product bears one of the distinctive logos below, or the testing agency is listed in the product specifications, you know it has been thoroughly tested and deemed safe—when used as directed.

Can you sell non UL Listed electrical products? ›

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.

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