Underwriters Laboratories Standard 325
UL 325 Standard
The Underwriters Laboratories Inc. (UL) is a not-for-profit organization that is the leading third-party certification organization in North America. UL’s primary mission is to evaluate products in the interest of public safety.
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What is the UL 325 Standard?
UL 325 started as a standard focused on the electric operation of garage doors. In the mid 1990’s electric gate operators where included into the UL 325 standard and over the following years government agencies and other interest groups have monitored the standard’ progress, providing input on the final format of the standard that relates to gate operators. The current edition of UL 325 is the Fifth Edition, dated June 7, 2002.
Highlights of the UL 325 include:
- A glossary defining types of operators,
- Classification of operators,
- Entrapment protection criteria for each class,
- Entrapment alarm criteria,
- Requirements for gate construction and installation.
- Installation of warning signs
All UL 325 compliant gates must have as a minimum, a primary and a secondary entrapment protection system.
Entrapment protection system types:
- Non-contact sensor
- Contact sensor
- Adjustable clutch or pressure relief
- Continuous pressure actuating device
- Audio alarm
What is allowed as an acceptable primary and secondary device depends on the classification of the gate in question.
Gate Operator Classifications:
- Residential (one to four single family dwellings)
- Commercial usage with general public access
- Industrial usage with limited public access
- Industrial usage with restricted public access
All gate operator classes must have both a primary and a secondary entrapment provision; where the secondary entrapment system is a different type then the first. What is allowed to be used for each depends on the operator classification.
There are also provisions in the UL325 standard regarding gate operators that describe what should happen in the event of different scenarios resulting from entrapment device activations. For example, an audio alarm should sound in the event of two sequential activations of entrapment protection if the gate has public access.
This is just an overview of the UL325 standard. It is our recommendation that every new gate should be installed in compliance with this standard. We would also advise that existing gates should be inspected to determine whether are [still] in compliance.