3
UL 325 CLASS TYPES AND
OBSTRUCTIONS SENSING SYSTEMS
UL 325 CLASS TYPES
CLASS ONE: RESIDENTIAL
Ÿ
A vehicular gate operator intended for use in
garages or parking areas associated with a
residence of one to four single families.
CLASS TWO: COMMERCIAL OR GENERAL
PUBLIC ACCESS
Ÿ
A vehicular gate operator intended for use at a
commercial location or building, such as a
multi-family housing unit (five or more single
family units), hotel, garages, retail stores, or
other buildings accessible by or servicing the
general public.
CLASS THREE: INDUSTRIAL OR LIMITED
ACCESS
Ÿ
A vehicular gate operator intended for use at
an industrial location or building, such as a
factory, loading dock area, or other locations
not accessible by or intended to service the
general public.
CLASS FOUR: RESTRICTED ACCESS
Ÿ
A vehicular gate operator intended for use at a
guarded industrial location or building, such as
airport security areas or other restricted
access locations not servicing the general
public and where unauthorized access is
prevented via supervision by security
personnel.
THE SIX TYPES OF OBSTRUCTION
SENSING SYSTEMS
TYPE A:
Ÿ
Inherent entrapment protection system. This
system must sense and initiate the reverse of
the gate within 2 seconds of contact with a
solid object.
TYPE B1:
Ÿ
Non-contact sensor (photoelectric sensor or
equivalent). This system shall, upon sensing
an obstruction in the direction of the gate
travel, reverse the gate within a maximum of 2
seconds.
TYPE B2:
Ÿ
Contact sensor (edge device or equivalent).
This system shall, upon sensing an obstruction
in the direction of the gate travel, initiate the
reversal of the gate within a maximum of 2
seconds.
TYPE C:
Ÿ
Inherent force limiting, inherent adjustable
clutch, or pressure relief valve.
TYPE D:
Ÿ
Actuating device requiring continuous pressure
to maintain opening or closing motion of the
gate.
Each class must have (2) monitored entrapment protection devices in each entrapment zone to sense and react
to obstructions within 2 seconds.
All-O-Matic’s gate operators conform to the most rigid Class One.
36VDC MANUAL (09.2020)
Monday, August 31, 2020 8:57:51 AM
