1、UL 499ISBN 0-7629-0161-6Electric Heating AppliancesJuly 17, 1998 UL 499 tr1Underwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for SafetyforElectric Heating Appliances, UL 499Twelfth Edition, Dated March 26, 1997Revisions: This Standard contains revisions throug
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20、een view or theprinted Standard.The requirements in this Standard are now in 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 ha
21、ve been revised and that have a future effective date arelocated after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice.New product submittals made prior to a specified future effective date will be judged under all of therequirements in this Standard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 w
22、ith a specified future effective date, unless theapplicant specifically requests that the product be judged under the current requirements. However, if theapplicant elects this option, it should be noted that compliance with all the requirements in this Standard willbe required as a condition of con
23、tinued Listing and Follow-Up Services after the effective date, andunderstanding of this should be signified in writing.Copyright 1998 Underwriters Laboratories Inc.July 17, 1998 UL 499 tr4This Standard consists of pages dated as shown in the following checklist:Page Datetr1 tr4 . July 17, 19981 . M
24、arch 26, 1997 (Reprinted July 17, 1998)2 . March 26, 19973 . July 17, 19984 20 . March 26, 199721, 22, 22A, 22B . July 17, 199823, 24 . March 26, 199725 . July 17, 199826 42 . March 26, 199743 . July 17, 199844, 45 . March 26, 199746 . July 17, 199847 49 . March 26, 199750 . November 17, 199751 69 .
25、 March 26, 199770, 70A, 70B . July 17, 199871, 72 . March 26, 199773 . November 17, 199774 88 . March 26, 1997A1 . November 17, 1997A2 . March 26, 1997sr1, sr2 . July 17, 1998tr5 July 17, 1998 UL 499No Text on This PageMARCH 26, 1997(Title Page Reprinted: July 17, 1998)1UL 499Standard forElectric He
26、ating AppliancesFirst Edition October, 1930Second Edition October, 1933Third Edition December, 1936Fourth Edition May, 1940Fifth Edition January, 1949Sixth Edition August, 1956Seventh Edition June, 1962Eighth Edition July, 1968Ninth Edition January, 1972Tenth Edition December, 1978Eleventh Edition J
27、une, 1987Twelfth EditionMarch 26, 1997An effective date included as a note immediately following certain requirements is oneestablished by Underwriters Laboratories Inc.The Department of Defense (DoD) has adopted UL 499 on August 17, 1987. Thepublication of revised pages or a new edition of this sta
28、ndard will not invalidate theDoD adoption.Revisions of this standard will be made by issuing revised or additional pages bearingtheir date of issue. A UL Standard is current only if it incorporates the most recentlyadopted revisions, all of which are itemized on the transmittal notice thataccompanie
29、s the latest set of revised requirements.ISBN 0-7629-0161-6COPYRIGHT 1978, 1998 UNDERWRITERS LABORATORIES INC.2 ELECTRIC HEATING APPLIANCES UL 499 MARCH 26, 1997CONTENTSFOREWORDINTRODUCTION1 Scope . 52 Components . 53 Units of Measurement . 64 References . 6CONSTRUCTION5 General . 66 Frame and Enclo
30、sure . 67 Assembly . 158 Stability . 169 Corrosion Protection . 1610 Supply Connections . 1711 Current-Carrying Parts . 2712 Internal Wiring . 2813 Heating Elements . 3114 Electrical Insulation . 3115 Thermal Insulation . 3116 Motors . 3217 Overcurrent Protection of Conductors and Heating Elements .
31、 3218 Motor-Running Overload Protection . 3419 Motor and Power-Transformer Short-Circuit and Ground-Fault Protection . 3420 General (Short-Circuit and Ground-Fault) Overcurrent Protection . 3521 Thermal Cutoffs . 3522 Lampholders . 3523 Switches . 3624 Automatic Controls and Control Circuits . 3725
32、Spacings . 3826 Grounding . 3927 Pressure Vessels and Parts Subject to Pressure . 4128 Protection Against Injury to Persons . 42PERFORMANCE29 General . 4330 Power Input Test . 4331 Leakage Current . 4332 Normal Temperature Test . 4733 Test of Insulation Resistance and Leakage Current as a Result of
33、Moisture . 5434 Dielectric Voltage-Withstand Test . 5735 Mechanical Endurance Test . 5836 Resistance to Impact . 5937 Overflow Test . 6238 Abnormal Operation Test . 62JULY 17, 1998 ELECTRIC HEATING APPLIANCES UL 499 339 Testing of Component Switches and Control Devices . 6740 Strain Relief Test . 70
34、40A Push-Back Relief Test . 7041 Test for Permanence of Cord Tag for Outdoor-Use Heating Appliances with Power-SupplyCords Less than 6 Feet (1.8 m) . 70MANUFACTURING AND PRODUCTION-LINE TESTS42 Production-Line Dielectric Voltage-Withstand Test . 7143 Polarization and Grounding Continuity Tests . 72RATINGS44 Details . 73MARKINGS45 Details . 7346 Instructions . 80ELECTRODE-TYPE HEATING APPLIANCES47 Scope . 8048 General . 8049 Construction . 8050 Operation Test . 8151 Vaporizer-Operation Test . 8252 Leakage Current Test .
