What Are UL 325 Standards?

UL 325 safety standards are rules and regulations that address the automatic operation of vehicular gates, louvers, garage doors, and windows. The standards set forth within UL 325 are developed by Underwriters Laboratories (UL) which acts as an independent organization that establishes safety standards for a wide range of products. These standards are created in collaboration with industry experts, manufacturers, government agencies, and consumer representatives.

UL 325 was initially introduced in 1973 and has undergone multiple revisions, the most recent of which was in February of 2023. As of May 2018, 43 states including California and Nevada have adopted versions of the International Building Code (IBC) that reference compliance with UL 325 and ASTM F2200. These standards are enforceable as law in the states that have adopted the IBC, making UL 325 a critical standard for ensuring safety in automated gate and door systems across much of

the United States​.

Key Components of UL 325 Standards

UL 325 requires gate operators to have built-in mechanisms to prevent entrapment – meaning that if something obstructs the gate while moving, the gate must either stop or reverse direction to avoid causing harm. UL 325 sets forth entrapment protection in two categories:

• Type A Entrapment Protection: Inherent entrapment sensing devices built into the gate operator. These devices automatically detect obstructions and reverse or stop the gate without external sensors. 
• Type B Entrapment Protection: External entrapment sensors such as photoelectric or edge sensors (contact activated) are added to the gate system at specific locations to detect obstructions. When an obstruction is detected, they send a signal to the gate operator to stop or reverse the gate’s movement. 

In addition to entrapment protection, gates must be equipped with a means to operate manually in case of power failure or malfunction. This ensures the gate can be opened or closed in any situation. 

Compliance and Installation

UL 325 specifies that all installation practices must comply with the National Electrical Code and local codes. Installers must ensure that all components are correctly connected and configured according to the manufacturer’s specifications and UL 325 requirements.

Since its introduction in 1973, UL 325 has undergone 3 major revisions, 2019, 2020, and 2023. Each revision is part of an ongoing process to enhance and address safety concerns to account for technological advancements in the industry.

How does UL 325 Apply to My Gate?

UL 325 standards are non-retroactive. This means that operators installed prior to UL 325 revisions typically do not need to be upgraded to meet the new requirements. However, while older systems are grandfathered in, any major modifications made to the gate systems or control mechanisms will need to be completed in accordance with the most recent UL 325 revision. Major modifications can be summarized as any alteration that changes the functionality and performance of the gate, as well as anything that would impact its performance, including major changes in weight or adding additional features.

What constitutes a major modification? 

• Replacement of the control system: Updating or replacing the gate’s control unit with a new system that changes how the gate operates or responds to safety sensors. Note: A like-for-like swap does not constitute a major modification as it does not change functionality or performance. 
• Changes to entrapment protection features: adding, removing, or significantly altering the entrapment protection devices (i.e. safety sensors or reversing mechanisms) that affect how the cate detects and responds to obstructions. 
• Alteration of the Motor or Drive Mechanism: Replacing or significantly modifying the motor or the mechanical parts that move the gate, which could affect the gate’s speed, force, or the way it opens and closes.
• Integration of Additional Functionalities: Adding features such as automated access controls, security systems, or other technologies that interact with the gate’s operational mechanics. 
• Structural Changes to the Gate: Significantly altering the size, weight, or design of the gate, which could impact the load and performance specification for which the original operator was designed.

Industrial Door Company’s Approach to UL325

Industrial Door Company takes a comprehensive approach to servicing automated gates, emphasizing safety, reliability, and compliance with industry standards. Our service strategy includes routine maintenance checks, timely repairs, and upgrades to ensure that each gate system operates efficiently and safely. Industrial Door Company will ensure that all mechanical components, sensors, and control systems are meticulously inspected and maintained. This proactive servicing helps extend the life of gate systems, enhances functionality, and reduces the risk of accidents, aligning with their commitment to customer satisfaction and safety.

Conclusion

Industry standards such as UL 325 are vital for ensuring the safety and reliability of automated gate systems. These regulations govern the essential safety features required to prevent accidents and injuries, such as entrapment protection mechanisms and manual operation capabilities. We are committed to ensuring your gates are operational and up to all applicable codes. 

Industrial Door Company is here to help with a comprehensive approach to service, repair, and routine maintenance. We will ensure that your automated gates run smoothly, and are safe, reliable, and fully compliant. 

Drew Morgan

Drew is a seasoned Installation Manager and problem solver with a passion for getting projects completed and correct the first time. Drew brings 40 years of experience in the industry to the table with 18 years in rolling door manufacturing and 22 years here at Industrial Door Company. Over the years he has accumulated a vast sum of knowledge in the commercial door industry and wears many hats. Drew balances the needs of our team and our clients and our clients building long lasting relationships along the way. He has great attention to detail with his primary focus being helping people in any way he can.