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IMPORTANT SAFETY INSTRUCTIONS
Mighty Mule 352
5
ENTRAPMENT ALARM (UL 325; 30A.1.1A)
The Mighty Mule® 352 Gate Opener is designed to stop and reverse within 2 seconds when the
gate comes in contact with an obstruction. Additionally, these openers are equipped with an audio
entrapment alarm which will activate if the unit obstructs twice while opening or closing. This alarm
will sound for a period of 5 minutes, or until the opener receives an intended signal from a hardwired
entry/exit source (e.g. push button control or keypad) and the gate returns to a fully open or fully closed
position. Turning the power switch on the control box OFF and back ON will also deactivate the alarm.
Wireless controls such as transmitters and wireless keypads will not deactivate the alarm.
Secondary Means of Protection Against
Entrapment
As specified by Gate Opener Safety Standard, UL 325 (30A.1.1), automatic gate openers shall have
an inherent entrapment sensing system, and shall have provisions for, or be supplied with, at least one
independent secondary means to protect against entrapment. The Mighty Mule® 352 utilizes Type A, an
inherent (i.e., built-in) entrapment sensing system as the primary type of entrapment protection. Also, the
Mighty Mule® has provisions for the connection of Type B2 protection to be used as the secondary type
of entrapment protection.
1. For gate openers utilizing a contact sensor (e.g., safety edge sensor– Type B2) in accordance with
UL 325 (51.8.4 [i]):
A. One or more contact sensors shall be located at the leading edge, bottom edge, and post edge,
both inside and outside of a vehicular swing gate system.
B. A hard wired contact sensor shall be located and its wiring arranged so that the communication
between the sensor and the gate opener is not subjected to mechanical damage.
C. A wireless contact sensor such as one that transmits radio frequency (RF) signals to the gate
opener for entrapment protection functions shall be located where the transmission of the signals
are not obstructed or impeded by building structures, natural landscaping or similar obstruction.
A wireless contact sensor shall function under the intended end-use conditions.
Bottom Edge Contact Sensor
on both sides of the gate
Leading Edge Contact Sensor
on both sides of the gate
Post Edge Contact Sensor
on both sides of the gate
Post Edge Contact Sensor
on both sides of the gate
Vehicular GateVehicular Gate