A project specification lands on your desk. Under “Seismic Bracing Components,” you read: “All sway bracing components shall be UL Listed and FM Approved.”
You reach out to three suppliers. But before you can evaluate quotes or lead times, you’re forced to confront a question that most MEP contractors and specifiers never think to ask—until it holds up a submittal:
What is the actual difference between UL Listing and FM Approval—and does this project require one, the other, or both?
This article cuts through the acronyms. We’ll break down the fundamental distinctions between these two certification systems, compare their testing philosophies and performance criteria, and give you a practical framework for determining which mark your project actually needs—based on three decisive factors: code jurisdiction, insurer requirements, and project location.
1. Who Are UL and FM? Two Different Organizations, Two Different Missions
1.1 Underwriters Laboratories (UL)
UL is an independent, third-party testing and certification organization founded in 1894. Its mission is public safety: UL tests products to verify that they meet established safety standards, and it maintains a publicly accessible directory of certified products. When a component is “UL Listed,” it means UL has tested representative samples of that product to the relevant UL standard and determined that the product meets the standard’s requirements. UL also conducts periodic factory audits to verify that ongoing production matches the tested samples.
UL is not an insurance company. It does not insure buildings or property. Its certification is a statement about product safety and performance, not about insurability.
1.2 Factory Mutual (FM Approvals)
FM Approvals is the testing and certification division of FM Global — one of the world’s largest commercial property insurers. FM’s mission is loss prevention: FM tests products to determine whether they reduce the risk of property damage. When a component is “FM Approved,” it means FM has tested the product to its own standards (which are often more rigorous than UL standards for the same product category) and determined that the product meets FM’s loss prevention criteria.
The critical distinction: FM is both a certifier and an insurer. An FM Approved product has been evaluated not just for safety, but for its ability to prevent property loss — because FM Global’s own insurance payouts depend on that loss prevention actually working during a fire or earthquake.
1.3 The Practical Difference
2. Seismic Bracing: UL 203A vs. FM 1950 — The Testing Standards
For seismic sway bracing components used in fire sprinkler and MEP pipe support systems, two specific testing standards apply:
2.1 UL 203A: Sway Brace Devices for Sprinkler System Piping
UL 203A governs sway brace devices and relies on static load testing as its core methodology. Testers apply a gradually increasing tensile or compressive load to the brace component until failure occurs, then apply a safety factor to the failure load to determine the published rating.
This testing protocol features several distinct characteristics:
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Static loading – Testers apply load gradually (not cyclically), measuring ultimate strength under steady force.
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No seismic simulation – The test excludes the cyclic, multi-directional loads typical of actual earthquakes.
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Component-level focus – The standard tests individual parts (clamps, hinges, attachments) in isolation, not as fully assembled braces.
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Minimum NFPA requirement – UL 203A provides the minimum certification NFPA 13 mandates; Section 18.2 explicitly requires sway bracing components to be “listed.”
2.2 FM 1950: Seismic Sway Braces for Pipe, Tubing and Conduit
FM 1950 is FM Global’s standard for seismic sway braces. Its testing methodology is significantly more rigorous than UL 203A, incorporating dynamic, cyclic loading that simulates actual earthquake conditions.
Key characteristics of FM 1950 testing:
- Dynamic shake table testing: The brace assembly is mounted on a shake table and subjected to cyclic loading at frequencies and amplitudes that simulate seismic ground motion. This is the critical difference — FM 1950 tests whether the brace survives repeated load cycles, not just a single pull to failure (Utterlyty).
- Assembly-level testing: FM 1950 tests the complete brace assembly — structural attachment + brace member + pipe clamp + all connectors — as an integrated unit, not as individual components.
- Tension-only restriction: FM 1950 only permits tension-only (cable) braces for end-of-branch-line restraint. For main and cross-main piping, FM requires rigid bracing capable of resisting both tension and compression — a more demanding requirement than UL 203A/NFPA 13, which allows tension-only braces in most locations (Risk Logic).
- Corrosion resistance testing: FM 1950 includes environmental exposure testing to verify that the brace components maintain their load rating after exposure to corrosive conditions.
2.3 Testing Comparison Summary
3. Which Certification Does Your Project Need? A Decision Framework
3.1 Scenario 1: NFPA 13 Jurisdiction, No FM Global Insurance
3.2 Scenario 2: FM Global-Insured Facility
Requirement: FM Approved components mandatory.
If the project owner’s property insurance is provided by FM Global (or its affiliates), the insurer’s loss prevention standards apply — and those standards require FM Approved components.FM Global Data Sheet 2-8 (Earthquake Protection for Automatic Sprinkler Systems) mandates FM Approval per FM 1950 for all sway bracing components.
This requirement applies regardless of local building code. Even if the local code only requires UL Listed components, the insurance contract requires FM Approved components — and non-compliance can result in denied claims after an earthquake. FM Global-insured facilities are common in:
- Large commercial and industrial facilities in North America
- Multinational corporation facilities worldwide
- Data centers, pharmaceutical plants, and semiconductor fabs
- Many projects in the Middle East where FM Global is a leading property insurer
3.3 Scenario 3: Middle East and International Projects
Requirement: Often both UL Listed and FM Approved.
In the Middle East—particularly in the UAE, Saudi Arabia, Qatar, Kuwait, and Oman—many large-scale projects such as hospitals, airports, hotels, and commercial towers require components that carry both UL Listing and FM Approval. This dual-certification requirement stems from two key drivers:
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Insurance requirements – Project property insurance is often underwritten by FM Global or a reinsurer that mandates compliance with FM standards.
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Regulatory clarity – While local civil defense authorities accept either UL or FM certification as proof of code compliance, many consulting engineers specify both to eliminate any ambiguity and ensure seamless approval across all stakeholders.
Specifying dual-certified components from a single supplier simplifies procurement (one supplier, one set of documentation) and eliminates the risk of field substitution between certified and non-certified components.
3.4 Scenario 4: Projects with No Specific Certification Requirement
Recommendation: Specify FM Approved components anyway — for future-proofing.
Some projects—particularly in developing markets with less prescriptive building codes—may not require any seismic bracing certification. Even so, specifiers should still choose FM Approved components because: (1) they protect the project if an FM-affiliated carrier later insures the property, (2) they provide documented proof of product quality during a failure investigation, and (3) they future-proof the installation—if new owners or a new insurance carrier take over, the bracing system already meets the higher standard.
4. The Tianying Machinery Advantage: Dual-Certified Components as Standard
At Weifang Tianying Machinery Co., Ltd., our seismic sway bracing components — beam adapters, hinges, pipe clamps, structural attachments — carry both UL Listing and FM Approval. This is not a marketing convenience — it is an engineering decision that reflects the reality of the global project market.
A specifier in Dubai does not want to determine whether the project insurer requires FM or UL — they want components that satisfy both. A contractor in Singapore does not want to stock two inventory lines for the same component type — they want one SKU that covers all projects. And a project owner in Lagos does not want to discover, after a fire or earthquake, that the installed components lacked the certification their insurer required.
Key Tianying Machinery certifications:
- UL Listed: Sway brace components tested to UL 203A; pipe hangers tested to UL 203
- FM Approved: Sway brace components tested to FM 1950 — including shake table dynamic testing and assembly-level validation
- CE Certified: Meeting European Union safety, health, and environmental requirements for products sold in the European Economic Area
Our cooperative factories undergo periodic factory audits by both UL and FM to verify ongoing manufacturing consistency — ensuring that the component you install today matches the component that passed the certification test. Every shipment includes traceable certification documentation linking the product’s serial or batch number to the certification record.
5. Frequently Asked Questions (FAQ)
Q: Does NFPA 13 specifically require UL Listed or FM Approved components?
A: NFPA 13 requires components to be “listed,” and Section 3.2.3 of NFPA 13 defines that term to mean a product appears on a list published by an organization that the authority having jurisdiction (AHJ) accepts. Both UL and FM are organizations acceptable to virtually all AHJs. So NFPA 13 does not require “UL Listed” specifically — it requires “listed” by a recognized testing laboratory, and UL Listing satisfies this. FM Approval also satisfies the NFPA 13 “listed” requirement because FM is a recognized testing laboratory. However, NFPA 13 does not require FM Approval — that requirement comes from the insurer, not the code (QRFS).
Q: Can I use UL Listed components on an FM Global-insured project?
A: No — unless the specific component also carries FM Approval. FM Global Data Sheet 2-8 explicitly requires FM Approved sway bracing components for fire sprinkler systems in FM-insured facilities. Using UL-Listed-but-not-FM-Approved components on such a project creates a compliance gap that can result in: (1) the insurer requiring replacement of the components at the owner’s expense, (2) the insurer declining to cover earthquake-related sprinkler system damage, or (3) the insurer imposing a higher premium or deductible. If your project is FM-insured, specify FM Approved components — end of discussion.
Q: Does Tianying Machinery provide both UL and FM certification for every component?
A: Yes. Our seismic sway bracing product line — including beam adapters, hinges, pipe clamps, structural attachments, and complete brace assemblies — carries both UL Listing (UL 203A / UL 203) and FM Approval (FM 1950). We also hold CE certification for sales into the European Economic Area. Every component ships with traceable certification documentation linking the product to its UL and FM certification records. This eliminates the compliance risk of mixed-source assemblies, where some components are certified and others are not — a common issue when contractors source individual parts from multiple suppliers.
Q: Is FM 1950 testing really that different from UL 203A?
A: Yes — the difference is fundamental. UL 203A tests a component by pulling it once until it breaks (static load to failure). FM 1950 tests the complete assembly on a shake table that simulates actual earthquake motion — applying hundreds or thousands of load cycles at varying frequencies and amplitudes. A component that passes UL 203A static testing may still fail under FM 1950 dynamic testing due to fatigue, loosening of threaded connections, or wear at hinge points — failure modes that static testing cannot detect. This is why FM insists on its own testing standard: an earthquake is a dynamic, cyclic event, not a single static pull.
Q: Is FM Approved always better than UL Listed?
A: “Better” depends on the context. FM 1950 testing is unquestionably more rigorous for seismic applications because it tests the complete assembly under dynamic loading that simulates an earthquake. For this reason, an FM Approved seismic sway brace has been validated to a higher standard of performance than a UL-Listed-only brace. However, for non-seismic applications — such as standard pipe hangers in non-earthquake zones — UL 203 certification is fully adequate and is the industry standard. The key is matching the certification to the application and the project’s requirements.
Q: How does CE certification fit with UL and FM?
A: CE certification is the European Union’s mandatory conformity marking for products sold within the European Economic Area. It covers safety, health, and environmental requirements defined by EU directives and regulations. CE is a legal requirement for market access in Europe — it is not a substitute for UL or FM, and UL/FM are not substitutes for CE. For projects in Europe, CE certification is mandatory; UL and FM are optional but often specified by multinational owners and insurers. For projects outside Europe, UL and FM are the primary certifications of interest, and CE serves as additional validation of product quality. Tianying Machinery’s products carry all three certifications — UL, FM, and CE — enabling supply to projects under any combination of jurisdictional and insurer requirements.
Q: Does using dual-certified components cost more than single-certified components?
A: The component cost difference is typically minimal (5–10%) because the manufacturing process and materials are the same — the difference is in the testing, certification maintenance, and factory audit costs that the manufacturer incurs and amortizes across production volume. The real cost comparison is not between dual-certified and single-certified components from the same supplier — it is between dual-certified components and the risk of specifying the wrong certification. If a contractor installs UL-Listed-only components on an FM-insured project, the cost of replacement — including labor, downtime, and disposal — can exceed the entire bracing budget. For this reason, many international contractors and specifiers standardize on dual-certified components for all projects, eliminating the risk of certification mismatch regardless of project-specific requirements.
6. Conclusion
UL Listed and FM Approved are not interchangeable terms. They represent different testing philosophies (static vs. dynamic), different organizational missions (public safety vs. loss prevention), and different compliance drivers (code compliance vs. insurance compliance).
For seismic bracing and fire protection systems, the practical rule is:
- UL Listed satisfies NFPA 13 code requirements — the minimum standard.
- FM Approved satisfies insurer requirements — the higher standard, and mandatory for FM Global-insured facilities.
- Dual certification (UL + FM) satisfies both — and eliminates the project risk of installing the wrong certification.
In a global project market where a contractor in Dubai may install bracing on a project insured by an FM Global affiliate and inspected by a consultant referencing NFPA 13, dual-certified components are not a luxury — they are the only procurement strategy that eliminates certification risk entirely.
Weifang Tianying Machinery Co., Ltd. supplies UL Listed, FM Approved, and CE Certified seismic sway bracing systems, pipe hangers, and structural attachments from our manufacturing base in Weifang, Shandong, China — 150 km from Qingdao port, with global shipping to projects across the Middle East, Southeast Asia, Africa, Europe, and the Americas.
Contact our team to request certification documentation, component specifications, or a project-specific quotation.
