If your machinery, control panel, or enclosure is headed to the United States or Canada, “UL listed cable gland” is likely the first phrase in the specification. Yet how cable glands are certified in North America confuses even experienced buyers: UL versus ETL, Listed versus Recognized, UL 514B versus other standards, and NPT threads that look nothing like the metric sizes used in Europe or Asia. This guide explains what the UL mark means for a cable gland, which standard applies, and what to verify before you order.

What Does “UL Listed” Mean for a Cable Gland?

UL (Underwriters Laboratories, now UL Solutions) is an OSHA-accredited Nationally Recognized Testing Laboratory (NRTL). When a cable gland carries a UL Listing mark, it means that specific product from that factory passed testing against an applicable safety standard — and the factory faces periodic follow-up inspections to confirm production still matches what was tested.

That distinction matters more than the logo itself:

• Listing is product-specific, not material-specific. A PA66 nylon with a UL 94 flammability rating is a material property. A listed gland is an evaluated finished product with its own UL file number.
• Listing is tied to a factory. The UL file belongs to the manufacturer and the production site, which is why buyers ask for the file number, not just a photo of a mark.
• Listing is enforced at inspection. Field installations follow the National Electrical Code (NFPA 70) in the US and the CE Code (CSA C22.1) in Canada; an authority having jurisdiction (AHJ) can reject equipment that uses unlisted fittings where the code requires listed ones.

UL 514B: The Standard Behind the Mark

The standard that governs most cable glands — called cord grips in North America — is UL 514B, Standard for Conduit, Tubing, and Cable Fittings. Its scope covers fittings used with cable and conduit in NEC and CE Code installations: cord grips, liquid-tight fittings, locknuts, bushings, and related cable entry fittings.

Several practical points follow from that scope:

• UL 514B covers general industrial and commercial cable entry fittings. If your application is a standard control panel, machine, LED driver enclosure, or outdoor junction box, UL 514B is the family of standards you should reference.
• Hazardous-location fittings are separate. Explosion-proof or intrinsically safe glands for Class I/II/III areas are evaluated under different standards, such as UL 1203. A UL 514B listing does not cover a hazardous location claim.
• Evaluation includes mechanical and sealing performance: strain relief and pull-out behavior, sealing under water and oil exposure, thread fit, and flammability of plastic parts — which is why an identical-looking cheap gland can still fail listing.

For the vast majority of OEM and project buyers, the question “is it UL listed?” really means “is it Listed under UL 514B, from a verifiable file, for the thread and cable range I need?”

UL Listed vs. UL Recognized: Know the Difference

North American buyers often confuse two UL approval types that are not interchangeable:

When a supplier says a cable gland is “UL approved,” ask which one they mean. A Recognized component mark on a rubber grommet does not make the assembled gland a Listed product, and an inspector will not accept it as one. For a gland installed at the point of cable entry, request a Listed product. If the same gland will be sold in both the US and Canada, the cULus mark is the practical choice because it covers both countries under one certification.

You will also meet the ETL mark (Intertek) and CSA marks. ETL is not “worse than UL”: Intertek is a separate OSHA-accredited NRTL that tests to the same UL 514B standard. What matters is that the file is real, current, and matches the exact product you are buying.

Why NPT Threads Are the North American Standard

Thread type is where many export orders go wrong. In the US and Canada, enclosure knockouts and conduit entries are commonly threaded in NPT — National Pipe Thread, per ASME B1.20.1 — a tapered inch thread in sizes such as 1/4″, 3/8″, 1/2″, 3/4″, and 1″. A metric M20 gland will not seal in a 3/4″ NPT knockout; forcing it is unsafe and a code violation.

Two related reads will save you most thread mistakes: our guide to metric vs. PG vs. NPT thread conversion explains how the systems compare, and the cable gland size chart maps thread sizes to cable clamping ranges in both systems.

If you are sourcing for the US market, you want gland series that are manufactured with true NPT options rather than adapted metric threads:

• Nickel-plated brass cable glands in Metric, PG, G, and NPT — the workhorse choice for industrial panels and machine tools, with IP68 sealing.
• PA66 nylon cable glands with NPT options — lightweight, corrosion-free, and economical for outdoor lighting and enclosure builders.
• Stainless steel cable glands in SS304/316 with G and NPT threads — specified for washdown, marine, and corrosive environments where the enclosure itself is stainless.

How to Verify a “UL Listed” Cable Gland

Verification takes five minutes if you know what to ask for. Follow these steps before you commit to an order:

1. Ask for the UL file number and the exact manufacturer name on the certificate. A listing always points back to a file held by the factory.
2. Search the UL Product iQ online database (accessible from ul.com) using the file number. Confirm the product description, the standard (UL 514B), and that the file is current — not expired or restricted to another factory.
3. Check the mark on the product or packaging. The mark should match the file: a circular UL for the US, cULus for US and Canada. Be suspicious of a printed logo with no matching file.
4. Request the test report or the listing category page that names the gland series, thread sizes, and cable ranges covered. The listing is only valid for the configurations actually evaluated.
5. Ask your inspector or AHJ in advance which listing they will require for the specific installation — requirements differ between a machine panel and a building installation.

One trap deserves emphasis: a material grade statement such as “UL 94 V-2 nylon” is not a product listing. It describes the plastic’s flammability class. Always ask for the finished-gland listing under UL 514B.

Sourcing UL Listed Cable Glands From a Factory: Documents to Request

Buying factory-direct, documentation is your main protection. Put this checklist in your RFQ:

A reputable factory will tell you plainly whether a given series carries a UL file or not — certification is per product, per file, and per factory. Ask the question early: “Can you provide the UL 514B file number for this NPT gland series?” If the answer is that certification is still in progress, then the product is not Listed today, regardless of how the sales sheet reads.

Jixiang Connector manufactures brass, nylon, and stainless steel gland ranges with NPT options and documents CE, TUV, RoHS, REACH, and IP68 test reports under its QC system. For projects that mandate UL-listed glands, confirm the UL file and supporting documentation with our export team before ordering, so certification questions are settled before your goods ship.

Conclusion

UL certification for cable glands comes down to three ideas. First, listing is product-level: a real UL 514B file held by the factory, not a material grade or a printed logo. Second, North America means NPT: specify inch threads such as 1/2″ NPT and confirm the gland series is manufactured for them. Third, verification is your job: check the file number in UL Product iQ and put the document checklist into your RFQ before you commit.

Doing this homework at sourcing time is cheaper than reworking an enclosure or explaining a red tag to a customer. If you need NPT gland options with documented test reports, talk to our export engineers — they can confirm what documentation is available for the series and thread size you need.

Frequently Asked Questions

What does UL Listed mean for a cable gland?

It means a specific gland product from a specific factory has been tested against a safety standard — normally UL 514B for conduit, tubing, and cable fittings — and the factory is subject to follow-up inspections. The listing is identified by a UL file number you can verify online.

Is ETL the same as UL?

Functionally yes. ETL is the mark of Intertek, a separate OSHA-accredited NRTL that tests to the same standards, including UL 514B. What matters is that the file is real, current, and covers the exact product and thread size you are buying.

What is the difference between UL 514B and UL 1203?

UL 514B covers general conduit, tubing, and cable fittings such as standard cable glands. UL 1203 covers explosion-proof and hazardous-location equipment. A UL 514B listing does not support a hazardous-location claim.

What thread do cable glands use in the United States?

NPT (National Pipe Thread, ASME B1.20.1), a tapered inch thread in sizes such as 1/4″, 3/8″, 1/2″, 3/4″, and 1″. Enclosure knockouts and conduit entries in the US are commonly NPT, so export glands should be manufactured with true NPT options.

Are nylon cable glands UL Listed?

Nylon glands can be Listed under UL 514B when the complete product passes evaluation. Note that a “UL 94 V-2 nylon” statement only describes the plastic’s flammability class — always ask for the finished-product UL file number rather than accepting a material claim.