Fencepost - May/June 2017 - 37

AFA

SAFETY

ARE YOU AWARE OF
UPCOMING CHANGES TO UL 325?
An important safety message from DASMA, North America's trade association for door
and access control products, in collaboration with IDEA, IDA, AFA & NOMMA

I

n March of this year Underwriters
Laboratories (UL) updated the standard for vehicular gate operators. The
changes to UL 325 will go into effect
on Aug. 1, 2018, just 15 months away.
One of the changes that will affect the
way gate operators are installed involves
the number of safety devices that must be
used. The changes are intended to address
vehicular gate operators traveling in both
the opening and the closing direction. These
changes will affect all horizontal slide gate
operators, all vertical pivot gate operators
and some horizontal swing gate operators.
All UL 325 listed vehicular gate operators are required to have a minimum of two
independent entrapment protection devices.
The inherent type A device is built into the
operator by the manufacturer. This type of
device is usually in the form of an RPM or
current sensor. The additional device can
take several forms, but the most common is
that of a type B1 non-contact (photoelectric)
sensor or a B2 contact (edge device) sensor.
The UL 325 revisions recognize that
vehicular gate operators have the potential to cause harm in both the opening and
the closing direction. Therefore, additional
independent safety devices are needed to be
in place to protect against entrapment when
both opening and closing the gate. Swing
gate operators are affected by the change
only if there is an entrapment zone in both
directions. If there is no entrapment zone in
one direction of travel, then only one means
of entrapment protection is required in that
direction; however, two independent means
of entrapment protection are required in the
other direction.
Entrapment zones are defined as any
area in which the gate, during any period
in its travel, comes closer than 16 inches
to a fixed object or has a gap of more than
2¼ inches. While this revision adds the

need for two entrapment protection devices
in both directions of travel for all horizontal slide gates, all vertical pivot gates and
some vertical swing gates, this is merely
the minimum requirement. It is important
to protect all entrapment areas of a gate
operator as some installations may have
multiple entrapment areas. Each of these
entrapment areas needs to be protected
with two independent entrapment protection devices.

PROPER MOUNTING OF
B1 EXTERNAL ENTRAPMENT
PROTECTION DEVICES
UL 325 defines what types of external
entrapment protection devices can be used
on gate operators. These devices must be
listed by the manufacturer as acceptable
devices and the operator must have been
tested by UL with the device to assure they

www.americanfenceassociation.com | 37 | May/June 2017

work properly together. UL defines where
and how external entrapment devices are
installed by describing how obstruction testing is to be performed.
For non-contact entrapment protection
devices (photoelectric sensors), UL specifies
that they be mounted within six inches of the
vertical plane of the gate and at a maximum
height of 27.5 inches above the ground. If
you have any doubt as to where and how
to mount external entrapment protection
devices, you should always follow the gate
operator manufacturer's instructions.
If the gate operator is UL listed, then
those instructions have been reviewed by
Underwriters Laboratories and have been
approved as proper guidance for the installation of the operator and the required
safety devices.
Whenever in doubt, it is always wise to
err on the safe side. ■


http://www.americanfenceassociation.com

Table of Contents for the Digital Edition of Fencepost - May/June 2017

Editor’s Note
Executive Director’s Message
President’s Message
Board of Directors | Board of Governors
Fencelines
Mistaken Identity: A Story of Cedar
Safety First
Minding Your Business
Class Act: AFA Education Foundation Bestows Seven Scholarships
Safety
Health Plan Checkup: Ensuring Your Benefits Program Is the Picture of Health
CLFMI
The Road More Traveled: 811 Car and 811 Bike Recognized as Damage Prevention Icons
New Members
The 811 Across Texas Public Awareness Campaign
Calendar
FenceSense
Index to Advertisers
Fencepost - May/June 2017 - Intro
Fencepost - May/June 2017 - cover1
Fencepost - May/June 2017 - cover2
Fencepost - May/June 2017 - 3
Fencepost - May/June 2017 - 4
Fencepost - May/June 2017 - 5
Fencepost - May/June 2017 - 6
Fencepost - May/June 2017 - 7
Fencepost - May/June 2017 - 8
Fencepost - May/June 2017 - 9
Fencepost - May/June 2017 - 10
Fencepost - May/June 2017 - 11
Fencepost - May/June 2017 - 12
Fencepost - May/June 2017 - Editor’s Note
Fencepost - May/June 2017 - 14
Fencepost - May/June 2017 - Executive Director’s Message
Fencepost - May/June 2017 - 16
Fencepost - May/June 2017 - President’s Message
Fencepost - May/June 2017 - 18
Fencepost - May/June 2017 - Board of Directors | Board of Governors
Fencepost - May/June 2017 - Fencelines
Fencepost - May/June 2017 - 21
Fencepost - May/June 2017 - Mistaken Identity: A Story of Cedar
Fencepost - May/June 2017 - 23
Fencepost - May/June 2017 - 24
Fencepost - May/June 2017 - 25
Fencepost - May/June 2017 - 26
Fencepost - May/June 2017 - Safety First
Fencepost - May/June 2017 - 28
Fencepost - May/June 2017 - 29
Fencepost - May/June 2017 - 30
Fencepost - May/June 2017 - Minding Your Business
Fencepost - May/June 2017 - 32
Fencepost - May/June 2017 - 33
Fencepost - May/June 2017 - Class Act: AFA Education Foundation Bestows Seven Scholarships
Fencepost - May/June 2017 - 35
Fencepost - May/June 2017 - 36
Fencepost - May/June 2017 - Safety
Fencepost - May/June 2017 - Health Plan Checkup: Ensuring Your Benefits Program Is the Picture of Health
Fencepost - May/June 2017 - 39
Fencepost - May/June 2017 - 40
Fencepost - May/June 2017 - 41
Fencepost - May/June 2017 - 42
Fencepost - May/June 2017 - CLFMI
Fencepost - May/June 2017 - 44
Fencepost - May/June 2017 - The Road More Traveled: 811 Car and 811 Bike Recognized as Damage Prevention Icons
Fencepost - May/June 2017 - 46
Fencepost - May/June 2017 - New Members
Fencepost - May/June 2017 - 48
Fencepost - May/June 2017 - The 811 Across Texas Public Awareness Campaign
Fencepost - May/June 2017 - 50
Fencepost - May/June 2017 - Calendar
Fencepost - May/June 2017 - 52
Fencepost - May/June 2017 - FenceSense
Fencepost - May/June 2017 - 54
Fencepost - May/June 2017 - 55
Fencepost - May/June 2017 - 56
Fencepost - May/June 2017 - 57
Fencepost - May/June 2017 - 58
Fencepost - May/June 2017 - 59
Fencepost - May/June 2017 - 60
Fencepost - May/June 2017 - 61
Fencepost - May/June 2017 - Index to Advertisers
Fencepost - May/June 2017 - cover3
Fencepost - May/June 2017 - cover4
Fencepost - May/June 2017 - outsert1
Fencepost - May/June 2017 - outsert2
Fencepost - May/June 2017 - outsert3
Fencepost - May/June 2017 - outsert4
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