1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1638A Visual Signal Appliances for General Signaling Use STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYR
2、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Visual Signal Appliances for General Signaling Use, UL 1638A First Edition, Dated June 22, 2016 Summary of Topics This is the First Edition of ANSI/UL 1638A, the Standard for
3、 Safety for Visual Signal Appliances for General Signaling Use. The new requirements are substantially in accordance with Proposal(s) on this subject dated April 8, 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by a
4、ny means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no ev
5、ent will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of
6、the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, e
7、xpense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JUNE 22, 2016 UL 1638A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRO
8、DUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 22, 2016 UL 1638A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 22, 2016 1 UL 1638A Standard for Visual Signal Appliances for General Signaling Use First
9、Edition June 22, 2016 This ANSI/UL Standard for Safety consists of the First Edition. The most recent designation of ANSI/UL 1638A as an American National Standard (ANSI) occurred on June 22, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Commen
10、ts or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electro
11、nic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 1638A-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FO
12、R FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 22, 2016 VISUAL SIGNAL APPLIANCES FOR GENERAL SIGNALING USE - UL 1638A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope
13、 .5 2 General 5 2.1 Components .5 2.2 Units of measurement .6 2.3 Undated references .6 2.4 Electrical circuit terminology .6 CONSTRUCTION 3 Enclosure 6 3.1 General .6 3.2 Cast metal enclosures 8 3.3 Sheet metal enclosure 9 3.4 Nonmetallic enclosures 9 3.5 Ventilating and acoustical openings 10 4 Ac
14、cessibility of Uninsulated Live Parts, Film-Coated Wire, and Moving Parts 10 5 Corrosion Protection .12 6 Field Wiring Connections .12 6.1 General 12 6.2 Field wiring compartment .13 6.3 Field wiring terminals or leads 13 6.4 Grounding terminals and leads 14 6.5 Grounded supply terminals and leads 1
15、4 7 Internal Wiring .15 7.1 General 15 7.2 Aluminum terminations .15 7.3 Wireways .16 7.4 Splices .16 7.5 Barriers 16 7.6 Bushings .16 7.7 Strain relief .17 8 Components 17 8.1 Mounting of components .17 8.2 Operating components .18 8.3 Current-carrying parts 19 8.4 Coil windings .19 8.5 Connectors
16、and receptacles 19 8.6 Electrical insulating material 19 8.7 Printed-wiring boards 20 9 Adhesives Used to Secure Conductive Parts 20 10 Spacings 21 PERFORMANCE 11 General 22 11.1 Test samples 22 11.2 Test voltages 23 12 Electrical Measurements .23 JUNE 22, 2016 VISUAL SIGNAL APPLIANCES FOR GENERAL S
17、IGNALING USE - UL 1638A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 13 Variable Voltage Operation Test 23 14 Temperature Test .23 15 Endurance Test 26 16 Component Failure Test .26 17 Abnormal Operation and Burnout Test 27 18 Dielectric
18、 Voltage-Withstand Test .27 19 Rain Test 28 20 Variable Ambient Tests 32 21 Transient Tests .32 21.1 General .32 21.2 Supply line transients .32 21.3 Internally induced transients .33 22 Vibration Test 33 23 Jarring Test 33 24 Tests on Polymeric Materials .34 25 High-Temperature Exposure Test .35 26
19、 Flame Test .35 27 Impact Test 35 INSTALLATION AND OPERATING INSTRUCTIONS 28 General 36 MARKINGS 29 General 36 APPENDIX A Standards for ComponentsA1 JUNE 22, 2016 VISUAL SIGNAL APPLIANCES FOR GENERAL SIGNALING USE - UL 1638A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIB
20、UTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover electrically-operated visual signaling appliances, rated 300 volts or less, and intended for indoor locations, outdoor locations, or both, in accordance with the National Electrical Code, NFPA 70. 1.2 These requiremen
21、ts cover visual signaling appliances for use in ordinary locations. Visual signaling appliances for use in hazardous locations, as dened in the National Electrical Code, NFPA 70, are evaluated on the basis of their compliance with these requirements and further appropriate examination and tests to d
22、etermine their acceptability for such use. 1.3 These requirements cover general signal use visual signaling appliances that are intended for non-emergency use. These visual signals do not contain any sensory functions and are intended to be connected to or controlled by other equipment. 1.4 When the
23、 appliance produces both a visual signal and an audible signal, the product shall also comply with the Standard for Audible Signal Appliances for General Signaling Use, UL 464A, or the Standard for Speakers for Commercial and Professional Use, UL 1480A, as appropriate. 1.5 These requirements do not
24、cover visual signaling appliances intended for re alarm use as dened in the National Fire Alarm Code, NFPA 72. 1.6 These requirements do not cover lamp or strobe-light assemblies intended for entertainment or room lighting. 1.7 These requirements do not cover emergency lighting or exit lighting visu
25、al signals. 1.8 These requirements do not cover annunciators that identify functions of a re or emergency signaling system or relate information concerning portions thereof. Annunciators are covered under the Standard for Control Units and Accessories for Fire Alarm Systems, UL 864. 2 General 2.1 Co
26、mponents 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by this standard. 2.1.2 A component is not required
27、to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. JUNE 22, 2016 VISUAL SIGNAL APPLIANCES FOR GENERAL SIGNALING USE - UL 163
28、8A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components are incomplete in construction features or restricted i
29、n performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 2.2 Units of measurement 2.2.1 Values stated without parentheses are the requirement. Value
30、s in parentheses are explanatory or approximate information. 2.3 Undated references 2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 2.4 Electrical circuit terminology 2.
31、4.1 For the purpose of these requirements, electrical circuit characteristics are dened as follows: a) High-Voltage A circuit classied as high-voltage is one having circuit characteristics in excess of those of a low-voltage circuit. b) Low-Voltage A circuit classied as low-voltage is one involving
32、a potential of not more than 30 volts AC, 42.4 volts peak or DC. 2.4.2 The term appliance as used in these requirements refers to any equipment covered by this standard. 2.4.3 For purposes of this standard the terms “visual” and “visible” are interchangeable. CONSTRUCTION 3 Enclosure 3.1 General 3.1
33、.1 The enclosure of an appliance shall be sufficiently strong and rigid to resist the abuses likely to be encountered during intended service. The degree of resistance inherent in the appliance shall preclude total or partial collapse and the attendant reduction of spacings, loosening or displacemen
34、t of parts, and other serious defects which alone or in combination constitute an increase in the risk of re, electric shock, or injury to persons. 3.1.2 Enclosures for individual electrical components, outer enclosures, and combinations of the two are to be considered in determining compliance with
35、 the requirement in 3.1.1. JUNE 22, 2016 VISUAL SIGNAL APPLIANCES FOR GENERAL SIGNALING USE - UL 1638A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.1.3 Operating parts, such as gear mechanisms, light-duty relays, and similar devices, s
36、hall be protected against fouling by dust or other material that may impair their intended operation. 3.1.4 Electrical parts of an appliance shall be enclosed to provide protection against contact with uninsulated live parts. 3.1.5 An appliance intended to be installed on a ush-device box, cutout bo
37、x, or similar device, is to be evaluated with regard to compliance of the combination with the requirement in 3.1.4. 3.1.6 The enclosure of an appliance shall be provided with means for mounting in the intended manner. Any ttings, such as brackets or hangers necessary for proper mounting shall be fu
38、rnished with the appliance. The mounting means shall be accessible without disassembling any operating part of the appliance. The removal of a completely assembled panel, cover, or equivalent, to mount the appliance is not considered to be disassembly of an operating part. 3.1.7 An enclosure shall h
39、ave provision for the connection of metal-clad cable, conduit, or non-metallic sheathed cable. An enclosure without such provision may be used when instructions are furnished with it indicating the sections of the enclosure that are intended to be drilled in the eld for the connection of raceways, o
40、r when the appliance is intended for mounting on an outlet box. 3.1.8 A cover or other detachable part of the enclosure shall be provided with means, other than snap-catch fastenings only, for rmly securing it in place. The removal of the cover or detachable part shall require the use of a common ha
41、nd tool, such as a screwdriver or wrench. 3.1.9 Except as noted in 3.1.10, an appliance intended for either ush or surface mounting in a back box shall be provided with a back box of thickness as specied in Table 3.1. Table 3.1 Thickness of sheet metal Group Maximum dimensions of enclosure Minimum t
42、hickness of sheet metal Steel Copper, brass or aluminum, Length or width, Area, Zinc-coated, Uncoated, inches (mm) inches 2 (cm 2 ) inch (mm) inch (mm) inch (mm) A 3 (76.2) 6 a (39) 0.025 (0.64 b ) 0.021 (0.53 b ) 0.023 (0.58 c ) B 8 (203) 36 (232) 0.030 (0.76 b,d ) 0.027 (0.69 b,d ) 0.036 (0.91 d )
43、 C 12 (305) 90 (581) 0.034 (0.86 d ) 0.032 (0.81 d ) 0.045 (1.14 d ) a Volume of enclosure not more than 12 cubic inches (197 cm 2 ). b Sheet steel for an enclosure intended for outdoor use (rain-tight) is required to be not less than 0.036 inch (0.91 mm) thick when zinc coated and not less than 0.0
44、32 inch (0.81 mm) thick when uncoated. c Sheet copper, brass, or aluminum for an enclosure intended for outdoor use (rain-tight) is required to be not less than 0.029 inch (0.074 mm) thick. d For a cover in Group B or C having a supporting frame or equivalent reinforcing and not intended for outdoor
45、 use, the thickness of sheet steel may be less than that specied in the table but shall not be less than 0.021 inch (0.53 mm) 0.025 inch (0.64 mm) when zinc coated; and the thickness of copper, brass, or aluminum may be less than that specied in the table, but shall not be less than 0.029 inch (0.74
46、 mm). 3.1.10 An appliance need not be furnished with a back box if: a) Means are provided for attachment to a standard outlet box and JUNE 22, 2016 VISUAL SIGNAL APPLIANCES FOR GENERAL SIGNALING USE - UL 1638A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P
47、ERMISSION FROM UL b) The required spacings as specied in Spacings, Section 10, are maintained when the appliance is mounted on such a box. 3.1.11 There shall be space within a terminal or wiring compartment to permit the use of a standard conduit bushing on conduit connected to the compartment when
48、a bushing is required for intended installation. 3.2 Cast metal enclosures 3.2.1 The thickness of cast metal used for an enclosure shall be as indicated in Table 3.2. Cast metal having a thickness 1/32 inch (0.8 mm) less than that indicated in the table may be used when the surface under considerati
49、on is curved, ribbed, or otherwise reinforced, or when the shape, size, or both, of the surface provides mechanical strength equivalent to the required thickness. Table 3.2 Cast metal enclosures Use, or dimensions of area involved a Minimum thickness Die-cast metal, Cast metal of other than the die-cast type, inch (mm) inch (mm) Area of 24 square inches (155 cm 2 ) or less and not having any dimension greater than six inches (152 mm) 1/16 (1.6) 1/8 (3.2) Area greater than 24 square inches (155 cm 2 ) or having
