UL 2021-2015 UL Standard for Safety Fixed and Location-Dedicated Electric Room Heaters (Fourth Edition Reprint with revisions through and including December 14 2016).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2021 Fixed and Location-Dedicated Electric Room HeatersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT A

2、UTHORIZED 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 The Fourth Edition of the Standard for Fixed and Location-Dedicated Electric

3、 Room Heaters, UL 2021, has been issued to reect the latest ANSI approval date, and to incorporate the proposals dated July 10, 2015. These proposals include the following: Wall-mounted heaters located near ceiling height. The new requirements are substantially in accordance with Proposal(s) on this

4、 subject dated July 10, 2015. 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 is withou

5、t 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 event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of

6、 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 the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of th

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8、rchaser is storing an electronic Standard on the purchasers computer system. SEPTEMBER 30, 2015 UL 2021 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 30, 2015 UL 2021 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORI

9、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 30, 2015 1 UL 2021 Standard for Fixed and Location-Dedicated Electric Room Heaters First Edition January, 1992 Second Edition April, 1997 Third Edition January, 2013 Fourth Edition September 30, 2015 This ANSI/UL Stand

10、ard for Safety consists of the Fourth Edition. The most recent designation of ANSI/UL 2021 as an American National Standard (ANSI) occurred on September 30, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Comments or proposals for revisions on an

11、y 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 electronic copy of a Standard should be al

12、tered 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 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 2021-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTI

13、ON WITHOUT PERMISSION FROM UL SEPTEMBER 30, 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 Glossary .7 3 Components 9

14、 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 Printed wiring boards 15 3.8 Semiconductors and small electronic components .16 3.9 Suppleme

15、ntal 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 Pressure .29 9 Polymeric Materials 31 10 Assembly 31 11 Protection Against Corrosion .33 12 Adjustm

16、ent 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-Carrying Parts 46 15 Internal Wiring 46 15.1 General .46 15.2 Protection of wiring .47 15.3 S

17、plices 48 15.4 Separation of circuits .49 15.5 Barriers .50 16 Heating Elements .50 17 Electrical Insulation .50 18 Thermal Insulation 51 19 Motors .51 19.1 General .51 19.2 Insulation systems 52 20 Overcurrent Protection, General 53 21 Overcurrent Protection, Motors and Motor Circuits 54 SEPTEMBER

18、30, 2015 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, High-Voltage Control Circuit Conductors .56 22.1 Direct-connected high-voltage control circuit

19、.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 26 Receptacles and Transfer Switches .62 27 Lampholders .62 28 Switches .63 29 Automatic Con

20、trols 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 .71 32.3 Floor heaters 72 PERFORMANCE 33 General 72 34 Power Input Test .73 35 Leakage

21、 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 41.1 General .84 41.2 Abnormal motor temperature test .85 41.3 Stalled fan .86 41.4 O

22、vervoltage 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 Ceiling-panel heaters 93 41.13 Abnormal ambient test .94 42 Endurance Test 95 43 Short-C

23、ircuit 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 Test .100 SEPTEMBER 30, 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL

24、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 Test for Permanence of Cord Tag .104 52.1 General 104 52.2 Test conditions .104 52.3 Tes

25、t 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 Grounding Continuity 109 57 Production-Line Tip Over .109 RATINGS 58 Details .110 MARKINGS 59

26、 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 information 122 SUPPLEMENT SA - FIXED AND LOCATION DEDICATED ELECTRIC ROOM HEATERS F

27、OR 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 SA5 Mounting Means .SA1 SA6 Performance SA1 SUPPLEMENT SB - CEILING INSERT AIR HEATERS

28、 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 Scope SB1 CONSTRUCTION SB2 Temperature Limiting Means SB1 PERFORMANCE SB3 Normal Te

29、mperature 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 overlamping SB4 SB4.3 Thermally protected defeated fan motor SB5 SB4.4 Locked rotor SB7 SB5 Ma

30、rking 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 DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover xed

31、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 movable heaters, wall- or ceiling-hung heaters, baseboard heaters, duct heaters, cent

32、ral-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 requirements. 2 Glossary 2.1 For the purpose of this Standard, the following denition

33、s 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 APPLIANCE INLET (Motor Attachment Plug) A male contact device mounted on an end product a

34、ppliance 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 conguration specied for use with heating or cooking appliances. 2.5 CEILING SURFACE-MOUNTED

35、 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 2 kilowatts or greater and marked as a commercial/industrial heater in accordance wi

36、th 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 to the purpose. When incorporated in an appliance, equipment otherwise typically eld

37、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, 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 7UL COPYRIGHTED MA

38、TERIAL 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 electrical connection to an attachment plug or, as an appliance coupler, to an equipme

39、nt inlet. 2.9 CONTROL CIRCUIT A circuit that carries 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 carry the main power current. 2.10 FIXED HEATER A heater that is fastened or otherwise assi

40、gned 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 those of a low-voltage or an isolated-limited-secondary circuit. 2.12 LOCATION-DEDICATED HE

41、ATER 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 dimension limitations, or both of a movable heater. 2.13 LOW-VOLTAGE CIRCUIT A circuit involving a p

42、otential 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 xed impedance that, as a unit, complies with all the performance requirements for a Class 2 trans

43、former. (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 to be a low voltage nor an isolated limited secondary circuit.) 2.14 TEMPERATURE CONTROLS Device

44、s 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 use, and whose malfunction would not result in a risk of re. b) Limiting - Functions only under

45、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 Control - A control intended to start or regulate the heater during normal operation. An example

46、 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 shock, re, or injury to persons during abnormal operation of the heater. An example would be a

47、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 operating value, operating time, or operating sequence have not been declared and tested to the

48、Standard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1A. SEPTEMBER 30, 2015 FIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS - UL 2021 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FRO

49、M 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 for Household and Similar Use, Part 1: General Requirements, UL 60730-1A. 2.17 TYPE 2.H ACTION So designed that the contacts cannot be prevented from opening and which may automatically reset to the closed position if the reset means i