UL 325 gate opener requirements, explained

An automatic gate is a heavy machine that moves on its own. UL 325 is the US standard that sets how gate operators must protect people from being trapped or struck. Here’s what it asks for, what changed in 2016, and a checklist you can hand to an installer.

What UL 325 and ASTM F2200 cover

• UL 325 is the safety standard for door, gate, window and similar operators. For gates, it sets how the operator senses obstructions, which external sensors it must support and monitor, and the installation instructions makers must give.
• ASTM F2200 covers how automated vehicular gates are built: openings people could reach through, exposed rollers, gaps and similar hazards. DASMA notes UL 325 aligned some of its rules with ASTM F2200 in 2016.

You need both. A listed operator can’t make an unsafe gate safe.

Usage classes

UL 325 sorts gate operators into four classes by where they’re used. These are the definitions in Eagle’s installation manuals:

Class	Where	Examples
I	Residential: a home of one to four single-family dwellings, or its garage or parking area	Driveway gate
II	Commercial or general access, open to the public	Apartment complex (five or more units), hotel, retail
III	Industrial or limited access, not open to the public	Loading dock, industrial yard
IV	Restricted access, supervised by security staff	Airport security area, guarded facility

An operator must be listed for the class you use it in. DASMA notes the Class II and III definitions were tightened in 2016, which can change which operator suits a site.

Types of entrapment protection

UL 325 labels the ways an operator can protect people. Eagle’s manuals list them like this:

Type	What it is
A	Inherent: built into the operator, usually a sensor that detects the motor working harder and reverses
B1	Non-contact sensor, such as a photo eye
B2	Contact sensor, such as an edge sensor on the gate
C	Inherent adjustable clutch or pressure-relief device (swing gates and barrier arms)
D	A control you must hold down to keep the gate moving

There used to be a Type E (an audio alarm). Since January 12, 2016 it no longer counts as entrapment protection, because it’s a warning, not a protection.

What changed on January 12, 2016

DASMA published the changes, written by engineers from DoorKing and LiftMaster:

1. Two independent means. Each place a person could be trapped needs at least two independent means of entrapment protection. They can be two built-in systems, two external devices, or one of each, but not two of the same type.
2. Monitoring. Photo eyes (B1) and edge sensors (B2) used for protection must be checked by the operator every cycle, for connection and correct operation. If one is missing, broken or shorted, the gate runs only on constant pressure, and remotes won’t work.
3. The installer decides where. Manufacturers show examples; the installer must find every entrapment risk on the actual site.
4. “Primary” and “secondary” removed. All protection devices are equally important.
5. Type E removed as protection. All classes must have an audio alarm that sounds after two obstructions in a row.
6. Controls at least 6 ft away from any moving part, except emergency controls for fire, police and EMS.
7. Barrier arms need protection if the arm moves toward a rigid object closer than 16 in.
8. Class II and III definitions refined.

DASMA’s technical director adds that protection is needed in both directions of travel, that every monitored device must be UL 325 listed and approved by the operator’s maker, and that a clutch (Type C) counts only if it was tested with that operator.

Where sensors go

The installer must protect every spot where the gate can trap someone. Eagle’s manuals show typical placements:

Slide gates

• Edge sensors on the leading and trailing edges of the gate, and post-mounted inside and outside where the gate passes.
• Photo eyes across the opening for the closing direction, and along the fence for the opening direction, where the gate can trap someone against a wall.
• Positive stops at both ends of the track.

Swing gates

• Edge sensors on the inside and outside leading edge of the leaf.
• An edge on the bottom of the leaf if it’s more than 6 in above the ground at any point in its swing.
• Photo eyes across the opening, and in the area the leaf sweeps when it opens toward a wall or the operator.

Install rules: a checklist

From UL 325’s installation instructions as reproduced by DoorKing and in Eagle’s manuals:

• The operator is listed for the gate type and the usage class.
• At least two independent means of entrapment protection for each entrapment area, in each direction.
• External photo eyes and edges are monitored and approved by the operator’s maker.
• Slide gate openings are screened from the bottom of the gate to at least 72 in (6 ft) high, so a 2 1/4 in ball can’t pass through, including the fence section the gate covers when open.
• Exposed rollers are guarded and pinch points removed or guarded.
• Controls are at least 6 ft from any moving part, can’t be reached through the gate, and outdoor controls have a security feature. Some manuals ask for more; Eagle’s swing manual says 10 ft.
• Warning signs are visible on both sides of the gate.
• The vehicle gate isn’t used by pedestrians; they have a separate gate.
• Swing gates don’t open into public access areas.
• The gate moves freely before the operator is installed, and its weight is within the operator’s rating (how to weigh a gate).

Old operators and old manuals

You can still install a UL 325 listed operator made before January 12, 2016, following its own instructions, according to DASMA. But read the manual’s date. If it still talks about “primary” and “secondary” protection or lists Type E as protection, it was written before the 2016 rules. Ask the maker for the current manual, and follow today’s monitoring rules for external sensors.

Eagle openers and UL 325

Eagle’s current manuals describe a built-in reversing sensor (Type A) on its operators, inputs for photo eyes and edges, and an alarm that sounds after two obstructions in a row. Its Eagle-I manual states that photo eyes and edges must be monitored.

The photo eye our partner sells for this is below. It was sold out when we checked on November 9, 2026.

Accessory

Eagle Access Control Systems

Eagle EG360 Monitored/Non-Monitored Photo Eye

Best for: Entrapment protection on UL 325 operators, or upgrading an older system

• UL 325 compliant, per the seller

Who it's forEagle and other operators that need a monitored photo eye across the gate opening.

Skip it ifYour operator's manual lists a different approved sensor; use the one your opener's maker approves.

Pros

• UL 325 compliant, per the store page
• Works on monitored (UL) and non-monitored (non-UL) inputs
• Up to 50 ft sensing range
• Reflector, hood and mounting hardware included

Cons

• Retro-reflective: needs a reflector lined up across the opening
• Pricier than the non-monitored EG363

Specs from Gate Operators Direct product page, checked Nov 2026.

$250–$300 at the time of writing (checked Nov 2026)

Check price at Gate Operators Direct

The cheaper Eagle EG363 is a non-monitored photo eye. Under the 2016 rules, a non-monitored eye can’t count as one of the required means of protection on a current operator.

Test it every month

Eagle’s manuals say to test the operator monthly: the gate must reverse when it meets a rigid object, and stop when a non-contact sensor is blocked. After any change to force or limits, test again. A gate that doesn’t reverse needs service before anyone uses it.

Common mistakes

• One photo eye and nothing else. Most sites have more than one entrapment area, and each needs two means of protection in each direction.
• Unmonitored sensors on a post-2016 operator. The gate will drop to hold-to-run, or the sensor won’t protect anyone.
• Keypads within reach of the gate. Keep controls 6 ft from moving parts.
• Turning up the force to make a sticky gate move. Fix the gate instead; manuals warn against over-tightening the clutch to compensate for a damaged gate.
• Using an old manual with pre-2016 rules.

Related

• Choose a listed operator with our guide to choosing a gate opener and the Gate Opener Finder.
• Gate swinging outward? Read push vs pull gate openers.
• Sensor holding the gate open? See gate opens but won’t close.
• See where the sensors go in a real install: swing gate and slide gate installation guides.
• Compare listed openers for slide gates and swing gates.