1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2021 Fixed and Location-Dedicated Electric Room Heaters STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRI
2、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fixed and Location-Dedicated Electric Room Heaters, UL 2021 Fourth Edition, Dated September 30, 2015 Summary of Topics This revision of ANSI/UL 2021 includes a Clarication of
3、Requirements for Heating Elements and miscellaneous editorial corrections. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new requirements are substantially in accordance with Proposal(s) on this subject date
4、d June 10, 2016 and October 28, 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as i
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9、UTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 30, 2015 (Title Page Reprinted: December 14, 2016) 1 UL 2021 Standard for Fixed and Location-Dedicated Electric Room Heaters First Edition January, 1992 Second Edition April, 1997 Third Edition January, 2013 Four
10、th Edition September 30, 2015 This ANSI/UL Standard for Safety consists of the Fourth Edition including revisions through December 14, 2016. The most recent designation of ANSI/UL 2021 as an American National Standard (ANSI) occurred on December 14, 2016 ANSI approval for a standard does not include
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13、ANSI/UL 2021-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 14, 2016 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBU
14、TION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 Glossary .7 3 Components 9 3.1 General .9 3.2 Attachment plugs, receptacles, connectors, and terminals 11 3.3 Controls 11 3.4 Cords, cables, and internal wiring .14 3.5 Film-coated wire (magnet wire) 15 3.6 Insulation systems .15 3.7
15、 Printed wiring boards 15 3.8 Semiconductors and small electronic components .16 3.9 Supplemental insulation, insulating bushings, and assembly aids 17 3.10 Switches 17 3.11 Transformers 18 4 Units of Measurement 18 5 References 19 6 General .19 CONSTRUCTION 7 Enclosure .19 8 Parts Subject to Pressu
16、re .29 9 Polymeric Materials 31 10 Assembly 31 11 Protection Against Corrosion .33 12 Adjustment Stop 33 13 Supply Connections .33 13.1 Permanently connected appliances .33 13.2 Cord-connected heaters .37 13.3 Strain relief 41 13.4 Pin terminals .41 13.5 Bushings 44 13.6 Pilot lights .45 14 Current-
17、Carrying Parts 46 15 Internal Wiring 46 15.1 General .46 15.2 Protection of wiring .47 15.3 Splices 48 15.4 Separation of circuits .49 15.5 Barriers .50 16 Heating Elements .50 17 Electrical Insulation 50A 18 Thermal Insulation 51 19 Motors .51 19.1 General .51 19.2 Insulation systems 52 20 Overcurr
18、ent Protection, General 53 21 Overcurrent Protection, Motors and Motor Circuits 54 DECEMBER 14, 2016 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 22 Overcurrent Protection, Hig
19、h-Voltage Control Circuit Conductors 56 22.1 Direct-connected high-voltage control circuit 56 22.2 Tapped high-voltage control circuits 56 23 Overcurrent Protection, Transformers .57 23.1 High-voltage transformers .57 23.2 Low-voltage transformers 59 24 Temperature Limiting Means .59 25 Alarms .61 2
20、6 Receptacles and Transfer Switches 62 27 Lampholders 62 28 Switches .63 29 Automatic Controls and Control Circuits 65 29.1 General .65 29.2 Terminals and actuating members of safety devices 67 30 Spacings 67 31 Grounding 69 32 Guarding of Heating Elements 70 32.1 General .70 32.2 Panel-type heaters
21、 .71 32.3 Floor heaters 72 PERFORMANCE 33 General 72 34 Power Input Test 73 35 Leakage Current Test 73 36 Normal Temperature Tests .76 37 Conditions for Operation Tests 81 38 Continuous Operation Test .82 39 Terry Cloth Test Fabric .84 40 Alarm Device Endurance Test 84 41 Abnormal Operation Test .84
22、 41.1 General .84 41.2 Abnormal motor temperature test .85 41.3 Stalled fan .86 41.4 Overvoltage test .86 41.5 Tip over .87 41.6 Vertical wall .87 41.7 Terry cloth drape .88 41.8 Litter 89 41.9 Motor overload and stalled motor .89 41.10 Wall-mounted heaters .91 41.11 Floor insert heaters 93 41.12 Ce
23、iling-panel heaters 93 41.13 Abnormal ambient test .94 42 Endurance Test 95 43 Short-Circuit Tests .96 44 Overload Test High-Voltage Transformers 97 45 Burnout Test High-Voltage Transformers .98 46 Dielectric Voltage-Withstand Test 99 47 Insulation Resistance Test 99 48 Rain Test .99 49 Static Load
24、Test 100 SEPTEMBER 30, 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 50 Stability of Cord-Connected, Floor-Supported Heaters 100 51 Element Support Impact Tests .100 52 Tes
25、t for Permanence of Cord Tag 104 52.1 General .104 52.2 Test conditions .104 52.3 Test method 104 53 Protection Against Personal Injury Test .105 54 Strength of Adjustment Stop Test 107 MANUFACTURING AND PRODUCTION TESTS 55 Production-Line Dielectric Voltage-Withstand 108 56 Production-Line Groundin
26、g Continuity .109 57 Production-Line Tip Over 109 RATINGS 58 Details .110 MARKINGS 59 Details .110 60 Instructions for Use and Care 118 60.1 General .118 60.2 Installation .119 60.3 Important instructions 119 60.4 Operation 120 60.5 Maintenance 121 60.6 Grounding instructions .121 60.7 Heater carton
27、 information 122 SUPPLEMENT SA - FIXED AND LOCATION DEDICATED ELECTRIC ROOM HEATERS FOR USE UNDER USCG ELECTRICAL ENGINEERING REGULATIONS SUBCHAPTER J, (46 CFR, PARTS 110 113) ELECTRIC ROOM HEATERS FOR MARINE USE SA1 Scope SA1 SA2 Enclosure SA1 SA3 Heating Elements .SA1 SA4 Automatic Controls SA1 SA
28、5 Mounting Means SA1 SA6 Performance .SA1 SUPPLEMENT SB - CEILING INSERT AIR HEATERS WITH LAMPS INTRODUCTION SEPTEMBER 30, 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SB1
29、 Scope SB1 CONSTRUCTION SB2 Temperature Limiting Means SB1 PERFORMANCE SB3 Normal Temperature Test SB2 SB3.1 General SB2 SB3.2 Test box .SB2 SB3.3 Insulation SB3 SB3.4 Test procedure .SB3 SB4 Abnormal Operation Tests SB4 SB4.1 Inherently protected overlamping SB4 SB4.2 Thermally protected overlampin
30、g SB4 SB4.3 Thermally protected defeated fan motor SB5 SB4.4 Locked rotor SB7 SB5 Marking SB7 SB6 Operating and Installation Instructions .SB8 SEPTEMBER 30, 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUT
31、ION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover xed and location-dedicated electric room heating equipment rated 600 volts or less to be employed in ordinary locations in accordance with the National Electrical Code, ANSI/NFPA 70. 1.2 These requirements do not cover
32、movable heaters, wall- or ceiling-hung heaters, baseboard heaters, duct heaters, central-heating furnaces, fan-coil units, panel- or cable-type radiant-heating equipment, electric boilers, or any other electric heating equipment or appliances that are covered in or as a part of separate, individual
33、requirements. 2 Glossary 2.1 For the purpose of this Standard, the following denitions apply. 2.2 APPLIANCE COUPLER A single-outlet, female contact device for attachment to a exible cord as part of a detachable power-supply cord to be connected to an appliance inlet (motor attachment plug). 2.3 APPL
34、IANCE INLET (Motor Attachment Plug) A male contact device mounted on an end product appliance to provide an integral blade conguration for the connection of an appliance coupler or cord connector. 2.4 APPLIANCE (FLATIRON) PLUG An appliance coupler type of device having a cord guard and a slot congur
35、ation specied for use with heating or cooking appliances. 2.5 CEILING SURFACE-MOUNTED HEATER A heater that is permanently attached and mounted directly to a ceiling surface in such a manner that tools are necessary for its removal. 2.6 COMMERCIAL/INDUSTRIAL HEATER Any heater that is either: a) Rated
36、 2 kilowatts or greater and marked as a commercial/industrial heater in accordance with 59.16, b) Rated greater than 250 volts, c) A polyphase heater, or d) Rated greater than 6 kilowatts. 2.7 COMPONENT A device or fabricated part of the appliance covered by the scope of a safety standard dedicated
37、to the purpose. When incorporated in an appliance, equipment otherwise typically eld installed (e.g. luminaire) is considered to be a component. Unless otherwise specied, materials that compose a device or fabricated part, such as thermoplastic or copper, are not considered components. SEPTEMBER 30,
38、 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.8 CORD CONNECTOR A female contact device wired on exible cord for use as an extension from an outlet to make a detachable e
39、lectrical connection to an attachment plug or, as an appliance coupler, to an equipment inlet. 2.9 CONTROL CIRCUITAc i r c u i tt h a tc a rries the electric signals directing the performance of a controller which, in turn, governs power delivered to a motor or other load. A control circuit does not
40、 carry the main power current. 2.10 FIXED HEATER A heater that is fastened or otherwise assigned to a specic location, and is permanently wired to the branch circuit. 2.11 LINE-VOLTAGE CIRCUIT A circuit involving a potential of not more than 600 volts, and having circuit characteristics in excess of
41、 those of a low-voltage or an isolated-limited-secondary circuit. 2.12 LOCATION-DEDICATED HEATER A cord-connected heater that is normally placed in one location for usage such as cord-connected wall- or ceiling-mounted heater, or freestanding cord-connected heater that exceeds the weight or dimensio
42、n limitations, or both of a movable heater. 2.13 LOW-VOLTAGE CIRCUITAc i r c u i ti nvolving a potential of not more than 30 volts alternating-current, (42.4 volt peak or direct-current), and supplied by a primary battery or by a standard Class 2 transformer, or by a combination of transformer and x
43、ed impedance that, as a unit, complies with all the performance requirements for a Class 2 transformer. (A circuit derived from a source of supply classied as a line voltage circuit, using resistance in series with the supply circuit as a means of limiting the voltage and current, is not considered
44、to be a low voltage nor an isolated limited secondary circuit.) 2.14 TEMPERATURE CONTROLS Devices that respond with a change in temperature (thermostatic devices) may be one of the following types: a) Regulating - Functions only to regulate the temperature of the heater under intended conditions of
45、use, and whose malfunction would not result in a risk of re. b) Limiting - Functions only under conditions that produce abnormal temperatures. The malfunction of such a device will result in a risk of re. c) Auxiliary - Thermostatic device other than of the regulating or limiting type. d) Operating
46、Control - A control intended to start or regulate the heater during normal operation. An example would be a temperature-regulating control. An operating control could provide Type 1 or Type 2 action. (See denitions 2.15 2.18). e) Protective Control - A control intended to reduce the risk of electric
47、 shock, re, or injury to persons during abnormal operation of the heater. An example would be a temperature limiting control. A protective control always provides Type 2 action. (See denitions 2.15 2.18). 2.15 TYPE 1 ACTION Automatic action for which the manufacturing deviation and the drift of its
48、operating value, operating time, or operating sequence have not been declared and tested to the Standard for Automatic Electrical Controls Part 1: General Requirements, UL 60730-1. DECEMBER 14, 2016 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED
49、FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.16 TYPE 2 ACTION Automatic action for which the manufacturing deviation and the drift of its operating value, operating time, or operating sequence have been declared and tested to the Standard for Automatic Electrical Controls Part 1: General Requirements, UL 60730-1. 2.17 TYPE 2.H ACTION So designed that the contacts cannot be prevented from opening and which may automatically reset to the close
