UL325 Entrapment Protection
Class I | Class II |
A vehicular gate operator (or system) intended for use in a home of
A vehicular gate operator (or system) intended for use in a commercial location or building such as a 
Class III | Class IV |
A vehicular gate operator (or system) intended for use in a industrial location or building such as a factory or loading dock area or other locations not intended to service the general public.
A vehicular gate operator (or system) intended for use in a guarded industrial location or building such as an airport security area or other restricted access locations not servicing the general public, in which unauthorized access is prevented via supervision by security personnel.
This table illustrates the entrapment protection requirements for each of the four UL325 classes.
UL325 | Horizontal Slide, Vertical Lift, Vertical Pivot | Swing and Vertical Barrier (arm) | |||
Classifications |
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Primary Protection | Secondary Protection | Primary Protection | Secondary Protection | ||
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Class I and II | A | B1, B2 or D | A or C | A, B1, B2, C or D | |
Class III | A, B1 or B2 | A, B1, B2, D or E | A, B1, B2 or C | A, B1, B2, C or D | |
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Class IV | A, B1, B2 or D | A, B1, B2, D or E | A, B1, B2, C or D | A, B1, B2, C, D or E | |
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A- Inherent entrapment protection system.
B1 - Provision for connection of, or supplied with, a
B2 - Provision for connection of, or supplied with, a contact sensor (edge device or the equivalent). When used as the PRIMARY device, must be monitored.
C- Inherent adjustable clutch or pressure relief device.
D- Provision for connection of, or supplied with, an actuating device requiring continuous pressure to maintain opening or closing motion of the gate.
E- An inherent audio alarm.
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