TM 5-805-8
nonmetallic doors and frames. In addition, in hazardous
quired. One or more of the hanging devices, hinges
(BHMA A156.1) or pivots (BHMA A156.4) may be
locations, products which use intrinsically safe power
supplies or other means of operations, such as
replaced with a unit of similar appearance which has been
pneumatics should be considered. In all cases wiring must
modified to contain current carrying wiring. When electri-
be encased in separate metallic conduit with true earth
cal requirements dictate, special products are required to
ground. Stray voltages in many facilities could produce
meet the higher current capabilities. Surface mounted
small voltages in lock wiring which would prevent
transferring devices should not be mounted on the un-
locking devices from releasing in critical situations.
secured side of the opening or be mounted in the opening
b. Locking.
which might encounter traffic that could catch on the
(1) Electric Bolt Retraction. This feature differs
device.
d. Door Control. Electric door control hardware may
from locking in that it retracts the locking mechanism,
allowing the door to be operated in a push-pull manner.
either limit the force required to open or restrict the
This feature could also be used in conjunction with
closing action of the door. The designer should be aware
automatic door openers, providing security as well as
that there is a limited number of automatic door
convenience. Bolt and latch retraction is available in
manufacturers. The selection of automatic doors will
?deadbolt" style electric locks. Single and multipoint latch
consider the safety of operation. Mats which activate
retraction is available in both accident hazard called
doors will be discouraged. Power assist and low energy
?panic" and fire exit devices.
power operated doors will conform to BHMA A156.19.
(2) Locking Control. This action is similar to
(1) Opening Assist Units. These are door
standard pinned profile key action and is available in
operators which for a short time, remove the back
most all types of lockets, such as cylindrical, mortise, and
pressure of a closing device. Operators are also available
exit devices. In each case the trim is unlocked by the
as limited energy door operators designed to occasionally
application of electricity.
open doors for the physically impaired.
(3) Electric Strikes. Electric strikes permit the use
(2) Restricting Closing. This hardware can both
prevent, as well as delay the closing action of a door.
of standard store room function lockets integrated with
access control. For security purposes electric strikes are
Doors are held in the open position for convenient
not recommended for applications which require
operation of the area or building while meeting the self-
mounting on the exterior side of the frame. Electric strike
closing requirements of fire rated doors. This feature may
mounting locations are acceptable when used in
also be used to control the door for securing an opening
conjunction with rim or mortise exit fire and panic
from a remote location and/or for automatically
devices. Labeling restrictions do not allow the use of
containing a building under siege.
(3) Preventing Reclosing. These devices for a
electric strikes with fire rated vertical rod exit devices.
For security reasons and the validity of testing laboratory
door are connected to some type of smoke, fire, or other
approval, the use of vertical rod devices with electric
emergency detection system. If the emergency system is
strikes is not acceptable in those cases where compliance
actuated or there is a loss of power, the door will be self-
with NFPA 101 and NFPA 80 is required.
closing as required by NFPA 80 and other local codes. At
(4) Magnetic Locks. As an auxiliary locking
any time, the door may be manually pulled out of the hold
device, the magnetic lock is suitable for high traffic
open position, allowing the door to close. Devices which
access control designed to control both sides of door.
prevent closing include both those built into the door
Since positive latching is fail-safe on a loss of electrical
closer as well as those which attach to the wall or floor
power, their use as the only locking device on a label door
and have the strike attached to the door. Door closers may
is not acceptable.
also have the smoke and heat sensors built into the closer.
(5) Special Locking Arrangements. NFPA 101
(4) Delayed Reclosing Delayed reclosing provides
and some building codes refer to special locking by this
physically impaired persons adequate time to pass
or similar title. This type of locking combines opening
through an opening without the hindrance of the door
features that typically would be on exit doors with a level
under the force of a door closer. These systems require a
of security which adds a delay time after detection of
limited energy assist unit in place of a standard closer.
from 15 to 30 seconds. The use of this method is dictated
Devices which are similar in appearance to regular
by the requirements of the area to be contained, not only
closers are acceptable from an aesthetic perspective.
e. Switching Devices. These devices range from a
to protect property or information from theft but to
protect lives. This could be the case in a hospital, where
wall mounted switch which must match the finish of the
it might be required to prevent the wandering of patients,
other hardware on or about the door, to a key (or card)
or in high security areas. Normally, it requires several
operated switch that operates the electrified door
pieces of equipment to be assembled into a system. In no
hardware. Such products should be provided by the
manufacturer of the hardware so as to match the finish as
case should this system be assembled which does not
well as the compatibility of the products. Using other
contain an exit device that meets both fire and exit
requirements.
sources could jeopardize the successful operation of a
c. Power Transferring When electric door hardware
system as well as make obtaining parts and service
is mounted on swinging doors, power transferring is re-
difficult.
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