1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 823 Electric Heaters For Use In Hazardous (Classied) Locations STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL
2、 COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Electric Heaters For Use in Hazardous (Classied) Locations, UL 823 Ninth Edition, Dated October 20, 2006 Summary of Topics This revision to ANSI/UL 823 is being issued
3、to reaffirm approval as an American National Standard. No changes in requirements are involved. The new requirements are substantially in accordance with Proposal(s) on this subject dated February 26, 2016. The revisions dated April 22, 2016 include a reprinted title page (page 1) for this Standard.
4、 Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on w
5、hich the changed requirement becomes effective. 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 Sta
6、ndard 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 event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, los
7、t 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 the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard
8、, 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, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation i
9、ntroduced while purchaser is storing an electronic Standard on the purchasers computer system. APRIL 22, 2016 UL 823 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 22, 2016 UL 823 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT
10、 AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 20, 2006 (Title Page Reprinted: April 22, 2016) 1 UL 823 Standard for Electric Heaters For Use in Hazardous (Classied) Locations The First and Second editions were titled Electric Heaters for Use in Hazardous Loc
11、ations, Class I, Groups C and D, Class II, Groups E, F, and G. The Third through fth editions were titled Electric Heaters For Use In Hazardous Locations, Class I, Groups A, B, C, and D, and Class II, Groups E, F, and G. First Edition September, 1965 Second Edition January, 1969 Third Edition June,
12、1971 Fourth Edition May, 1972 Fifth Edition July, 1977 Sixth Edition October, 1985 Seventh Edition February, 1991 Eighth Edition October, 1995 Ninth Edition October 20, 2006 This ANSI/UL Standard for Safety consists of the Ninth Edition including revisions through April 22, 2016. The most recent des
13、ignation of ANSI/UL 823 as a Reaffirmed American National Standard (ANS) occurred on April 22, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be subm
14、itted 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 altered in any way. All of ULs Stand
15、ards 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 823-2012 (R2016)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM
16、UL OCTOBER 20, 2006 ELECTRIC HEATERS FOR USE IN HAZARDOUS (CLASSIFIED) LOCATIONS - UL 823 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 General 7 3 Components .8 4 Units of Measureme
17、nt .8 5 Undated References 8 6 Enclosure Types 8 7 Class I, Zone and Group Equivalency .9 7.1 Class I, Zone 1, Group IIA .9 7.2 Class I, Zone 1, Group IIB .9 7.3 Class I, Zone 1, Group IIC .9 7.4 Zone 20, Zone 21, and Zone 22 9 8 Glossary 9 CONSTRUCTION ALL HEATERS 9 General .10 10 Enclosure 10 10.1
18、 Enclosure .10 10.2 Thickness 11 11 Joints in Enclosures .12 11.1 General .12 11.2 Cemented joints .12 11.3 Joints with amepaths Class I, Groups A, B, C, and D .13 11.4 Class I, Groups C and D locations 14 11.5 Class I, Group B locations 20 11.6 Class I, Group A locations 21 11.7 Threaded joints .22
19、 11.8 Shaft Openings .23 11.9 Class II 27 12 Holes in Enclosures .30 12.1 Class I locations .30 12.2 Class II locations 30 13 Hot-Water or Steam Radiators 31 13.1 General .31 13.2 Immersed heating elements 31 13.3 Low-water cutoff 31 13.4 Parts subject to pressure .31 13.5 Water-ll opening 31 13.6 P
20、rovisions for mounting 31 14 Supply Connections Fixed Heaters 31 14.1 General .31 14.2 Conduit seals .35 14.3 Class II locations 36 14.4 Supply connections Portable heaters 38 14.5 Cord clamp .40 14.6 Securing of threaded joints .41 15 Hooks and Handles .41 16 Casters and Wheels .41 OCTOBER 20, 2006
21、 ELECTRIC HEATERS FOR USE IN HAZARDOUS (CLASSIFIED) LOCATIONS - UL 823 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 17 External Metal Parts .41 18 Bonding and Grounding 41 19 Temperature-Limiting Devices .42 20 Protection Against Corrosi
22、on 43 21 Materials Applied to Joint Surfaces 43 PERFORMANCE 22 Temperature Test .44 22.1 General .44 22.2 All heaters 45 22.3 Heaters for Class I locations 46 22.4 Heaters for Class II locations .46 22.5 Heaters for simultaneous exposure to Class I and Class II locations .47 23 Accelerated-Aging Tes
23、t on Bushings 48 24 Strain-Relief Test 48 25 Rough-Usage Test 48 26 Drop Test 49 27 Overturning Test 49 28 Stability Test 49 29 Dielectric Voltage-Withstand Test 50 30 Thermal-Cutoff Test .51 31 Low-Water Cutoff Test .51 31.1 General .51 31.2 Overload .51 31.3 Endurance .51 31.4 Pressure .51 31.5 Mo
24、ist ammonia-air stress cracking test .52 32 Non-Metallic Enclosure Materials Tests .52 32.1 General .52 32.2 Chemical compatibility by material samples .53 32.3 Chemical compatibility by complete end product tests .54 32.4 Test for accumulation of static electricity .56 32.5 Tests on sealing compoun
25、ds .57 33 Explosion Tests .58 34 Hydrostatic Pressure Test 62 35 Dust Penetration Test 64 36 Secureness of Conduit Hubs Test .64 37 Resistance Test .65 37.1 General .65 37.2 Leakage test on factory-installed conduit seals 65 37.3 Electrical-resistance test .65 37.4 Equipment having coated threaded j
26、oint surfaces or conduit openings .66 37.5 Tests on joint gaskets .66 PART II HEATERS FOR CLASS I, DIVISION 2, GROUPS A, B, C, AND D LOCATIONS GENERAL 38 Details .66 OCTOBER 20, 2006 ELECTRIC HEATERS FOR USE IN HAZARDOUS (CLASSIFIED) LOCATIONS - UL 823 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FUR
27、THER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 39 Enclosure 67 39.1 General .67 39.2 Enclosure material .68 40 Supply Connections .68 41 Protection Against Corrosion 69 42 Arcing and Sparking Parts 69 PERFORMANCE 43 Temperature Test .69 PART III HEATERS FOR CLASS II, DIVIS
28、ION 2, GROUP G LOCATIONS GENERAL 44 Details .70 45 Enclosure 70 46 Supply Connections .70 47 Control Devices .71 48 Protection Against Corrosion 71 PERFORMANCE 49 Temperature Test .71 50 Dust-Tight Enclosure Test 72 50.1 General .72 50.2 Dust-penetration method .72 50.3 Dust-blast method .73 50.4 At
29、omized-water method 73 MANUFACTURING AND PRODUCTION TESTS 51 General 73 52 Air-Leakage Test 74 53 Dielectric Voltage-Withstand Test .74 54 Bonding Test .74 MARKINGS 55 General 74 SUPPLEMENT SA - ALTERNATE JOINTS IN ENCLOSURES SA1 General SA1 SA2 Cemented Joints .SA1 SA3 Joints with Flamepaths Class
30、I, Groups A, B, C, and D .SA2 SA4 Labyrinth Joints Groups A, B, C, and D .SA3 SA5 Threaded Joints SA3 OCTOBER 20, 2006 ELECTRIC HEATERS FOR USE IN HAZARDOUS (CLASSIFIED) LOCATIONS - UL 823 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SA5
31、.1 General - Class I, Groups A, B, C, and D SA3 SA5.2 Class I, Groups A and B .SA3 SA5.3 Class I, Groups C, and D SA4 SA6 Straight(FlatorCylindrical),andRabbetJoints:ClassI,GroupsA,B,C,andD .SA5 SUPPLEMENT SB - ALTERNATIVE EXPLOSION TESTS SB1 Explosion Tests .SB1 OCTOBER 20, 2006 ELECTRIC HEATERS FO
32、R USE IN HAZARDOUS (CLASSIFIED) LOCATIONS - UL 823 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover explosion-proof, dust-ignition-proof and dust-tight portable and xed electric heaters for i
33、nstallation and use in hazardous (classied) locations, Class I, Divisions 1 and 2, Groups A, B, C, and D; Class II, Division 1, Groups E, F, and G; Class II, Division 2, Groups F and G; and Class III, Divisions 1 and 2, in accordance with the National Electrical Code, NFPA 70. 1.2 These requirements
34、 also cover explosion-proof electrical equipment for installation and use in Class I, Zone 1, Groups IIA, IIB and IIC hazardous (classied) locations and dust-ignition-proof equipment for use in Zone 20, 21, and 22 locations. Revised 1.2 effective December 30, 2010 1.3 These requirements also cover e
35、xplosion-proof electrical equipment that has been investigated for use in one or more specic gas or vapor atmospheres with or without additional Class I Groups. See 55.4. 1.4 These requirements cover electric air heaters, electric hot-water or steam radiators, and electric hot plates rated 600 volts
36、 or less. 1.5 These requirements also cover paint heaters, rated 600 volts or less, for use at pressures not exceeding 100 psig (690 kPa). Paint heaters operating at more than 100 psig may be investigated in accordance with these requirements and any additional requirements judged to be necessary. 1
37、.6 These requirements do not cover medical equipment. 1.7 These requirements cover heaters for use only under the following atmospheric conditions: a) A minimum ambient temperature of minus 50C (minus 58F); b) An oxygen concentration not greater than 21 percent by volume; and c) A nominal barometric
38、 pressure of one atmosphere. 2 General 2.1 An electric heater for use in hazardous locations shall also comply with the applicable requirements for a similar product for use in ordinary locations. 2.2 An electric heater for Class III locations shall comply with requirements for Class II, Group G, ex
39、cept that an enclosure for Class III, Division 2 shall be of the type described in 45.3. NOVEMBER 15, 2007 ELECTRIC HEATERS FOR USE IN HAZARDOUS (CLASSIFIED) LOCATIONS - UL 823 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Components 3.
40、1 Except as indicated in 3.2, a component of a product covered by this standard shall comply with the requirements for that component. 3.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in
41、 the product covered by this standard, or b) Is superseded by a requirement in this standard. 3.3 A component shall be used in accordance with its rating established for the intended conditions of use. 3.4 Specic components are incomplete in construction features or are restricted in performance cap
42、abilities. 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. 4 Units of Measurement 4.1 Values stated without parentheses are the requirement. Values in parentheses are
43、explanatory or approximate information. 5 Undated References 5.1 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. 6 Enclosure Types 6.1 A heater that is marked enclosure Type 7
44、 shall comply with the applicable requirements for Class I. A heater that is marked enclosure Type 9 shall comply with the applicable requirements for Class II. 6.2 An enclosure that is intended for use in other environmental conditions shall also comply with the applicable requirements for each enc
45、losure type, for example Type 3, 4X, or 6, specied in the Standard for Enclosures for Electrical Equipment, UL 50. OCTOBER 20, 2006 ELECTRIC HEATERS FOR USE IN HAZARDOUS (CLASSIFIED) LOCATIONS - UL 823 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSIO
46、N FROM UL 7 Class I, Zone and Group Equivalency 7.1 Class I, Zone 1, Group IIA 7.1.1 Explosion-proof electrical equipment intended to be marked in accordance with 55.2 shall comply with all the requirements for explosion-proof electrical equipment for use in Class I, Group D hazardous (classied) loc
47、ations. 7.2 Class I, Zone 1, Group IIB 7.2.1 Explosion-proof electrical equipment intended to be marked in accordance with 55.3 shall comply with all the requirements for explosion-proof electrical equipment for use in Class I, Group C hazardous (classied) locations. 7.3 Class I, Zone 1, Group IIC 7
48、.3.1 Explosion-proof electrical equipment intended to be marked in accordance with 55.5 shall comply with all the requirements for explosion-proof electrical equipment for use in both Class I, Group A and Class I, Group B hazardous (classied) locations. 7.4 Zone 20, Zone 21, and Zone 22 7.4.1 Dust-i
49、gnition-proof electric heaters intended to be marked Zone 20 and 21 in accordance with 55.8 shall comply with all the requirements for dust-ignition-proof electrical equipment for use in Class II, Division 1 hazardous (classied) locations. 7.4.2 Dusttight electric heaters intended to be marked Zone 22 in accordance with 55.9 shall comply with all the requirements for Dusttight electric heaters for use in Class II, Division 2 hazardous (classied) locations. 8 Glossary 8.1 For the purpose of
