1、UL 48ISBN 1-55989-974-3Electric SignsUnderwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Electric Signs, UL 48Fourteenth Edition, Dated February 29, 1996Revisions: This Standard contains revisions through and including July 2, 2001.UL Standards fo
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3、sulting from the use of ULs new electronic publishing system, please note thatadditional pages (on which no requirements have been changed) may be included in revision pages dueto relocation of existing text and reformatting of the Standard.Text that has been changed in any manner is marked with a v
4、ertical line in the margin. Changes inrequirements are marked with a vertical line in the margin and are followed by an effective date noteindicating the date of publication or the date on which the changed requirement becomes effective.The following table lists the future effective dates with the c
5、orresponding reference.Future Effective Date ReferencesJanuary 2, 2004 Paragraphs, 5.3.3, 10.2.1, 10.2.2, 10.3.1, 16.1A.1, 20.1.8,20.1.9, 20.1.11, 30A.2, Table 16.1, Figure 20.1The new and/or revised requirements are substantially in accordance with ULs Bulletin on this subjectdated February 4, 2000
6、. The bulletin is now obsolete and may be discarded.Not all proposals from the February 4, 2000 bulletin have been adopted. Some will be revised andreproposed at a later date. Additional revisions, editorial in nature, are included.The revisions dated July 2, 2001 include a reprinted title page (pag
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21、effect, except for those paragraphs, sections, tables, figures,and/or other elements of the Standard having future effective dates as indicated in the note following theaffected item. The prior text for requirements that have been revised and that have a future effective dateare located after the St
22、andard, and are preceded by a SUPERSEDED REQUIREMENTS notice.New product submittals made prior to a specified future effective date will be judged under all of therequirements in this Standard including those requirements with a specified future effective date, unlessthe applicant specifically reque
23、sts that the product be judged under the current requirements. However, ifJULY 2, 2001 UL 48tr2the applicant elects this option, it should be noted that compliance with all the requirements in thisStandard will be required as a condition of continued Listing, Recognition, and Follow-Up Services afte
24、rthe effective date, and understanding of this should be signified in writing.Copyright 2001 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:Page Date1-3.July 2, 20014.May14,19995-14B.July 2, 200115-17 .February 29, 199618-22B.July 2, 200123.De
25、cember 19, 199624-24B .September 3, 199825.February 29, 199626.September 3, 199827-30 .July 2, 200131-33 .February 29, 199634.July 2, 200135.February 29, 199636-40B.July 2, 200141-42 .February 29, 199643-50 .July 2, 200151.September 3, 199852-54B.July 2, 200155.February 29, 199656-56B.July 2, 200157
26、.February 29, 199658-60 .July 2, 200160A-60B .September 3, 199861-66 .July 2, 200167.September 3, 199868-71 .February 29, 199672-76 .July 2, 2001A1-A2 .July 2, 2001SR1-SR2.July 2, 2001JULY 2, 2001 UL 48 tr3JULY 2, 2001 UL 48tr4No Text on This PageFEBRUARY 29, 1996(Title Page Reprinted: July 2, 2001)
27、1UL 48Standard for Electric SignsFirst Edition November, 1917Second Edition March, 1930Third Edition September, 1937Fourth Edition March, 1940Fifth Edition June, 1954Sixth Edition February, 1957Seventh Edition December, 1958Eighth Edition December, 1960Ninth Edition November, 1966Tenth Edition Octob
28、er, 1971Eleventh Edition June, 1976Twelfth Edition November, 1980Thirteenth Edition March, 1988Fourteenth EditionFebruary 29, 1996An effective date included as a note immediately following certain requirementsis one established by Underwriters Laboratories Inc.Revisions of this Standard will be made
29、 by issuing revised or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on the transmittal noticethat accompanies the latest set of revised requirements.ISBN 1-55989-974-3COPYRIGHT 1989, 2001 U
30、NDERWRITERS LABORATORIES INC.JULY 2, 2001ELECTRIC SIGNS - UL 482No Text on This PageCONTENTSFOREWORD .4INTRODUCTION1 Scope .52 General .62.1 Components .62.2 Units of measurement .62.3 Undated references .73 Glossary .7CONSTRUCTION4 General .115 Frame and Enclosure .115.1 General .115.2 Thickness of
31、 sheet metal enclosures .135.3 Openings .136 Ventilating Openings .14A7 Glass Panels and Letters .14B7.1 General .14B7.2 Thickness .157.3 Support .168 Panels and Diffusers Other Than Glass .188.1 General .188.2 Decorative and structural parts other than glass .199 HID Lamp Signs .2010 Resistance to
32、Moisture .2110.1 Exclusion of water .2110.2 Drain openings .2110.3 Drain holes .2210.4 Gaskets .2211 Provisions for Mounting and Support .2211.1 Fixed signs .2211.2 Reserved for future use. .22A11.3 Portable signs .22A11.4 Pendant support .22B12 Protection Against Corrosion .22B13 Fastenings .2314 A
33、ccessibility of Live Parts .2615 Mechanical Assembly .2715.1 Hinges .2715.2 Electrical devices .2815.3 Signs shipped in sections .2816 Supply Connections .28A16.1 Permanently-connected signs .28A16.1A General .28A16.2 Conduit, electrical tubing, and cable .28A16.3 Cord-connected signs .28B17 Polarization .32JULY 2, 2001 ELECTRIC SIGNS - UL 48 2A18 Grounding and Bonding .
