1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 823 Electric Heaters For Use In Hazardous (Classied) LocationsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIA
2、L 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 to reaffirm approval
3、 as an American National Standard. No changes in requirements are involved. 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
4、 an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The revisions dated January 31, 2012 include a reprinted title page (page 1) for this Standard. All rights reserved. No part of this publication may be reproduced, stored in a r
5、etrieval 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 without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of me
6、rchantability 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 data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an a
7、uthorized 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 the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, a
8、nd hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard
9、are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located
10、after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JANUARY 31, 2012 UL 823 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 31, 2012 UL 823 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
11、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 20, 2006 (Title Page Reprinted: January 31, 2012) 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 Locations, Class I
12、, 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, 1971 Fourth Edi
13、tion 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 January 31, 2012. The most recent designation of A
14、NSI/UL 823 as a Reaffirmed American National Standard (ANS) occurred on January 31, 2012. 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 submitted to UL
15、 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 Standards and al
16、l copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2012 UNDERWRITERS LABORATORIES INC. ANSI/UL 823-2007 (R2012)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER
17、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 Measurement .8 5 Unda
18、ted 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 Enclosure
19、.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 11.8 Shaf
20、t 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 Provisi
21、ons 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 ELECTR
22、IC 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 Corrosion .43 2
23、1 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 Test on B
24、ushings 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 Moist amm
25、onia-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 compounds 57 33 Ex
26、plosion 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 joint surfaces
27、 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 FURTHER REPRODUCTI
28、ON 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, DIVISION 2, GROUP G
29、 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 Atomized-water me
30、thod .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 I, Groups A, B,
31、 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 SA5.1 General - Clas
32、s 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 (Flat or Cylindrical), and Rabbet Joints: Class I, Groups A, B, C, and D SA5 SUPPLEMENT SB - ALTERNATIVE EXPLOSION TESTS SB1 Explosion Tests .SB1 OCTOBER 20, 2006 ELECTRIC HEATERS FOR US
33、E 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 insta
34、llation 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 als
35、o 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 explo
36、sion-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 or
37、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. 1.6 T
38、hese 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 pre
39、ssure 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, except
40、 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 3.1 Ex
41、cept 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 the
42、 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 capabil
43、ities. 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 expl
44、anatory 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 sha
45、ll 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 enclosu
46、re 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 PERMISSION FR
47、OM 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) locatio
48、ns. 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 7.3.1
49、 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-ignition-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,
