1、ANSI/BHMA A156.24-2018 Revision of BHMA A156.24 - 2012 STANDARD FOR DELAYED EGRESS LOCKING SYSTEMS SPONSOR BUILDERS HARDWARE MANUFACTURERS ASSOCIATION, INC. AMERICAN NATIONAL STANDARDS INSTITUTE Approved March 29, 2018 2 An American National Standard implies a consensus of those substantially concer
2、ned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether they have approved the Standard or not, from manufactu
3、ring, marketing, purchasing, or using products, processes, or procedures not conforming to the Standard. American National Standards are subject to periodic review and users are cautioned to obtain the latest editions. CAUTION NOTICE: This American National Standard may be revised or withdrawn at an
4、y time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling
5、 or writing The American National Standards Institute. Published by BUILDERS HARDWARE MANUFACTURERS ASSOCIATION, INC. 355 Lexington Avenue, New York, New York, 10017 Copyright 2018 by the Builders Hardware Manufacturers Association, Inc. Not to be reproduced without specific authorization from BHMA
6、Printed in the US This Standard was developed by the Builders Hardware Manufacturers Association, Inc. It was approved by ANSI under the canvass method. BHMA was accredited on 21 March 1983 as a sponsor using the Canvass Method. 3 FOREWORD (This Foreword is not a part of ANSI/BHMA A156.24) The gener
7、al classification of builders hardware includes a wide variety of items which are divided into several categories. To recognize this diversity, a sectional classification system has been established. This Standard is the result of the collective efforts of members of the Builders Hardware Manufactur
8、ers Association, Inc. (BHMA) who manufacture these products. The total Product Standards effort is therefore, a collection of sections, each covering a specific category of items. Strength, cycle, and operational tests have been established to insure safety and stability to which the public is entit
9、led. There are no restrictions on design. This Standard is not intended to obstruct but rather to encourage the development of improved products, methods and materials. BHMA recognizes that errors will be found, items will become obsolete, and new products and methods will be developed. With this in
10、 mind the Association plans to update, correct and revise these Standards on a regular basis. It shall also be the responsibility of manufacturers to request such appropriate revisions. The BHMA numbers that indicate functions of delayed egress locking systems do not identify size of design and are
11、not intended to be used without necessary supplementary information. Individual manufacturers catalogs should be consulted. 4 TABLE OF CONTENTS 1. SCOPE 5 2. DEFINITIONS 5 3. GENERAL . 6 4. TEST METHODS . 8 5. TESTS . 8 APPENDIX (NOT A PART OF ANSI/BHMA A156.24) 10 5 1. SCOPE 1.1 This standard cover
12、s products used in connection with conventional exit devices or locks causing the doors to remain locked after releasing actuation for a predetermined length of time. Performance criteria are included for functional, cycle, operational, fail-safe and overload requirements. 1.2 Tests described in thi
13、s Standard are performed under laboratory conditions. In actual usage, results vary because of installation, maintenance, and environmental conditions. 2. DEFINITIONS 2.1 Delayed Egress Locking Systems A delayed egress locking system consists of a device or combination of devices arranged to be lock
14、ed in the direction of egress for a predetermined time after the normal releasing process has been initiated. After the predetermined time, the door allows egress. 2.2 Irreversible Process Period The amount of time from the application of force with the intent to open the door until the device is un
15、locked in the direction of egress. It is preset, normally at 15 or 30 seconds, as permitted by the AHJ. 2.3 Loss of Power Electrical power failure or voltage drop in the building or at the delayed egress locking system to the extent that the lock will release. 2.4 Nuisance Alarm The period of time,
16、of no more than 3 seconds which when removal of the force will cease the irreversible process period. It deters initiating the irreversible process of delayed egress in the event of accidental bumping of the door or actuating device. 2.5 Rated Line Voltage The operating voltage specified by the manu
17、facturer of a delayed egress locking system for that lock. 6 3. GENERAL 3.1 When a force, not to exceed 15 lbf (67 N), is continuously applied on the door or release device, for no more than three seconds, an irreversible process shall be initiated. That irreversible process will allow the door to b
18、e opened after that period. An audible signal shall be activated in the vicinity of the door equipped with the delayed egress locking system, to indicate to the user of the door that the system is operative. 3.2 Delayed egress locking systems are subject to building, fire, and life safety code requi
19、rements. Consult applicable codes for values in effect for nuisance delay duration release delay duration and other specific requirements. 3.3 Some codes require that when a door equipped with a delayed egress locking system is opened during unauthorized egress, the delay feature must be reset manua
20、lly at the door when the door closes. 3.4 The releasing mechanism of delayed egress locking systems shall require only one motion to initiate the irreversible process of opening, and the method of operation shall be obvious in all lighting conditions. 3.5 Upon loss of power, the time delay feature s
21、hall become inoperative and the lock shall allow egress without the delay. Battery back-up systems where permitted, shall not interfere with required emergency release systems. 3.6 Force to operate latch releasing trim shall be in compliance with the respective BHMA A156 series hardware standard. 3.
22、7 Exit devices, locks or auxiliary locks equipped with a delayed egress feature shall meet the requirements of ANSI/BHMA Standards A156.2-2017 for Bored and Pre-assembled Locks and Latches, A156.3-2014 for Exit Devices, ANSI/BHMA A156.13-2017 for Mortise Locks, A156.23-2017 for Electromagnetic Locks
23、 or A156.36-2016 for Auxiliary Locks, as applicable. Component manufacturers using locks or exit devices made by others are permitted to qualify their delayed egress system by testing with a single manufacturers lock. Upon qualification, any manufacturers lock of the same type, and providing it meet
24、s the applicable ANSI/BHMA Standard, may be used.7 3.8 American National Standards referenced in this Standard are available from the American National Standards Institute . 3.9 Delayed egress locking systems shall meet the requirements of the applicable clauses of UL Standard 294 as agreed upon by
25、 the Nationally Recognized Testing Laboratory (NRTL) and the manufacturer. The delayed egress locking system shall be so listed or labeled by the NRTL and be under the follow-up inspection service of the certifying laboratory. 8 4. TEST METHODS 4.1 The cycle test shall be performed on a 3 ft by 7 ft
26、 by 1 3/4 inch (915 x 2130 x 45 mm) minimum single door of wood or metal with a metal frame. The door and frame shall be rigid enough to hold hardware firmly and to withstand the tests outlined. Provisions shall be made for mounting appropriate measuring devices. A combined calibration and reading a
27、ccuracy within 5% shall be required for all values. 4.2 Doors shall be hung on heavy-duty anti-friction bearing hinges or pivots. 4.3 The door shall close and latch between each test cycle. 4.4 The delayed egress locking system to be tested shall be as described in 3.7 and shall be installed in acco
28、rdance with the manufacturers published instructions. 4.5 One sample shall be subjected to all of the tests. 5. TESTS 5.1 Cycle Test The door shall be opened by actuating the lock equipped with a 15 second maximum delay feature as described in 3.1. The door shall be allowed to close by action of the
29、 door closer. Electrically re-lock the system so that the time delay is operative. This constitutes one cycle. Repeat for 10,000 cycles. Failure occurs if more than a 15 lbf (67 N) force on the door or release device, or a torque of 28 in-lbf for levers, or 9 in-lbf for knobs, is required prior to a
30、nd at the completion of the cycle test or if the lock cannot be released at the end of the 15 second period at any point during the cycling period. 5.2 Operational Voltage Test Test the delayed egress locking system including electrical components at 15% of the rated line voltage to verify the opera
31、tion. 5.3 Strength Test All latching mechanisms shall be disengaged unless the latching mechanisms are an integral part of the delayed egress locking system. Apply and maintain 400 lbf. to the door approximately 3 in. (76mm) from the latch edge and 40 in. (1020 mm) from the floor in the direction of
32、 door swing. After five seconds, actuate the delayed egress locking system. The load shall be 9 continued until the 15 or 30 second irreversible process period has completed. The load shall then be removed and the door shall not open and the device shall function normally after release of the force.
33、 5.4 Test to Release Under Load With the door closed and the delayed egress locking system in the armed state, actuate the irreversible process period. Maintain 250 lbf. for a minimum ten seconds in the direction of door swing, until the irreversible process period ends. For exit devices, the force
34、shall be applied at the center of the actuating surface; for all other types of hardware, release any latching and apply the force approximately 3 in. (76mm) from the latch edge and 40 in. (1020 mm) from the floor. Failure occurs if the door opens prior to the expiration of the irreversible process
35、period or, does not open under load upon expiration of the irreversible process period. 5.5 Immunity Requirements (ESD) All system components which are subject to contact during normal operation shall meet the requirements of IEC 61000-4-2, level 4. 10 APPENDIX (NOT A PART OF ANSI/BHMA A156.24) A-1
36、Delayed egress locking systems should be used only in buildings protected throughout by an approved automatic fire detection system or an approved sprinkler system. Upon the initiation of such systems, the time delay feature should become inoperative and the releasing mechanism of the lock shall ope
37、rate without the delay. A-2 Signage and emergency lighting are required by the applicable building, life safety, and fire codes adopted by the jurisdiction to be installed on or adjacent to the device. This signage is usually supplied by the delayed egress locking system manufacturer and reads “Push
38、 Until Alarm Sounds. Door Can Be Opened in 15 (30) Seconds.“ or similar language. A-3 The maximum time irreversible process period permitted by the applicable building, life safety, and fire codes is 15 seconds with 30 seconds permitted when approved and adopted by the jurisdiction. A-4 Labeling pro
39、cedures for a delayed egress locking system require a reexamination or engineering evaluation by the laboratory for previously investigated components used in other assemblies. A-5 Conformance Criteria. Certification that products offered meets the requirements of this Standard and conform to the in
40、dividual manufacturers drawings, specifications, standards and quality assurance practices are available and in some circumstances are required. Buyer requirements determine the need for proofs of conformance such as first article inspection, test laboratory reports, or listings. Specifiers requirin
41、g assertions of conformance utilize statements of conformance by individual manufacturers, or test reports acceptable to the buyer. A-6 Preservation, Packaging and Packing. Unless other arrangements between buyer and seller are made, preservation, packaging and packing shall be sufficient to protect
42、 containers and their contents under normal shipping and handling conditions from the source of supply to the destination point. A-7 Marking. Unless other arrangements between buyer and seller are made, marking shall be in accordance with the individual manufacturers standard practice. 11 A-8 Conformance to Other Standards. This Standard contains a requirement for products to be listed or labeled by nationally recognized independent testing laboratories. Such laboratories require conformance to other standards in addition to ANSI/BHMA A156.24.
