1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL 998HumidifiersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIB
2、UTION WITHOUT PERMISSION FROM ULUL Standard for Safety for Humidifiers, UL 998Fifth Edition, Dated April 25, 2011Summary of TopicsRevisions for UL 998 are being issued to incorporate an effective date for the Fifth Edition. Nochanges in requirements are involved.As noted in the Commitment for Amendm
3、ents statement located on the back side of the titlepage, UL and CSA are committed to updating this harmonized standard jointly. However, therevision pages dated May 19, 2011 will not be jointly issued by UL and CSA as these revisionpages only address UL effective dates.The new/revised requirements
4、issued April 25, 2011, are substantially in accordance with Proposal(s) onthis subject dated November 19, 2010All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying, recording, or o
5、therwisewithout prior permission of UL.UL provides this Standard as is without warranty of any kind, either expressed or implied, including butnot limited to, the implied warranties of merchantability or fitness for any purpose.In no event will UL be liable for any special, incidental, consequential
6、, indirect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or theinability to use this Standard, even if UL or an authorized UL representative has been advised of thepossibility of such damage. In no event shall ULs liability f
7、or any damage ever exceed the price paid forthis Standard, regardless of the form of the claim.Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold ULharmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonablea
8、ttorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronicStandard on the purchasers computer system.The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, figures,and/or other elements of the Standard having
9、future effective dates as indicated in the preface. The priortext for requirements that have been revised and that have a future effective date are located after theStandard, and are preceded by a SUPERSEDED REQUIREMENTS notice.MAY 19, 2011 UL 998 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHE
10、R REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 19, 2011 UL 998tr2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCanadian Standards AssociationCSA C22.2 No. 104-11Fourth EditionUnderwriters Laboratories Inc.UL
11、998Fifth EditionHumidifiersApril 25, 2011ANSI/UL 998-2011UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCommitment for AmendmentsThis standard is issued jointly by the Canadian Standards Association (CSA) and UnderwritersLaboratories Inc. (UL
12、). Comments or proposals for revisions on any part of the standard may besubmitted to CSA or UL at anytime. Revisions to this standard will be made only after processingaccording to the standards development procedures of CSA and UL. CSA and UL will issue revisionsto this standard by means of a new
13、edition or revised or additional pages bearing their date of issue.ISBN 978-1-55491-623-8 2011 Canadian Standards AssociationAll rights reserved. No part of this publication may be reproduced in any form whatsoever without theprior permission of the publisher.CSA Standards are subject to periodic re
14、view, and suggestions for their improvement will be referredto the appropriate committee. To submit a proposal for change to CSA Standards, please send thefollowing information to inquirescsa.ca and include Proposal for change in the subject line:Standard designation (number); relevant clause, table
15、, and/or figure number; wording of the proposedchange; and rationale for the change.To purchase CSA Standards and related publications, visit CSAs Online Store at www.ShopCSA.ca orcall toll-free 1-800-463-6727 or 416-747-4044.Copyright 2011 Underwriters Laboratories Inc.ULs Standards for Safety are
16、copyrighted by UL. Neither a printed nor electronic copy of a Standardshould be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regardingthose Standards shall remain the sole and exclusive property of UL.This ANSI/UL Standard for Safety consists of the Fifth Editi
17、on. The most recent designation of ANSI/UL998 as an American National Standard (ANSI) occurred on April 25, 2011. ANSI approval for astandard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or thePreface. The National Difference Page and IEC Foreword are also exclude
18、d from the ANSI approval ofIEC-based standards.Comments or proposals for revisions on any 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 StandardsDevelopment System (CSDS) at http:/.To purchase UL Standards, v
19、isit Comm 2000 at http:/m- call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSPreface .6INTRODUCTION1 Scope .82 Definitions 83 General 93.1 Components .93.2 Reference publications .103.3 Units of measurement
20、123.4 Terminology 12CONSTRUCTION4 General .125 Enclosures 125.1 General 125.2 Nonmetallic materials 135.3 Enclosure integrity .146 Doors and Covers .157 Accessibility of Uninsulated Hazardous Voltage Live Parts and Film-Coated Wire 168 Protection Against Risk of Injury to Persons Mechanical Protecti
21、on 179 Protection Against Risk of Injury to Persons Materials 1810 Protection Against Risk of Injury to Persons Switches, Controls, and Interlocks .1811 Protection Against Risk of Injury to Persons Surface Temperatures .2012 Stability 2013 Strength of Handles .2014 Strength of Mounting 2015 Mechanic
22、al Assembly .2116 Liquid-Containing Parts 2117 Protection Against Corrosion .2218 Cord-Connected Products .2219 Permanently Connected Products .2320 Leads and Terminals 2421 Flexible Cords 2622 Strain Relief 2723 Bushings 2824 Current-Carrying Parts 2925 Internal Wiring 2926 Protection of Wiring .29
23、27 Wiring Connections .3028 Electrical Insulation .3029 Separation of Circuits .3130 Secondary Circuits 3330.1 General .3330.2 Extra-low-voltage circuits 3331 Grounding .3431.1 General .3431.2 Permanently connected products .3531.3 Cord-connected products 36APRIL 25, 2011 CSA C22.2 NO. 104-11 UL 998
24、 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL31.4 Bonding of internal parts 3632 Bonding Means .3733 Capacitors .3834 Coil Windings 3835 Heating Elements .3936 Motors .3936.1 General .3936.2 Motor overload protection .4036.3 Short circuit
25、 protection 4237 Overcurrent Protection 4238 Protection Against Overheating .4339 Receptacles 4540 Switches and Controllers 4541 Electrically Operated Valves and Solenoids 4642 Spacings 4643 Thermal Insulation 4744 Wetting Live Parts 4845 Internal Plumbing .4846 Filters .4847 Pressure Vessels and Pa
26、rts Subjected to Pressure .4848 Protection of Service Personnel 5048.1 General .5048.2 Construction .5149 Duct- and Plenum-Mounted Products .5350 Construction of Duct- and Plenum-Mounted Products .5350.1 Installation .5350.2 Polymeric material 5350.3 Evaporation pad .5450.4 Supply cord .54PERFORMANC
27、E51 General Test Parameters 5451.1 General .5451.2 Voltage .5551.3 Ambient temperatures 5552 Leakage-Current Test .5553 Humidity-Conditioning Test .5654 Operation Test .5755 Starting Test .5756 Input Test 5757 Normal-Temperature Test 5857.1 All products 5857.2 Duct- or plenum-mounted products .6158
28、Disassembly and Reassembly Test .6159 Impact .6160 Rotating Members 6261 Dielectric Voltage-Withstand Test .6262 Strain-Relief Test .6362.1 General .6362.2 Through-cord switch 6363 Power-Supply Cord Push-Back Relief Test .6364 Cable-Clamp Test 63APRIL 25, 2011CSA C22.2 NO. 104-11 UL 9984UL COPYRIGHT
29、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL65 Abnormal Operation Test 6465.1 General .6466 Thermal Cutoff Test .6467 Gasket Test 6468 Liquid-Container Test .6569 Flooding of Live Parts Test 6570 Backflow Test 6671 Bonding-Conductor Test .6772 Tests o
30、n Parts Subject to Pressure .6773 Mold Stress-Relief Test 68RATINGS74 Electrical Ratings .69MARKING AND INSTRUCTIONS75 Identification and Ratings 6976 Informational and Instructional Markings .7377 Operating Instructions .7378 Field Wiring 74TABLES AND FIGURESTables .76Figures .87Annex A Standards f
31、or componentsAnnex B French translations and markingsAnnex C Manufacturing and Production TestsAPRIL 25, 2011 CSA C22.2 NO. 104-11 UL 998 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPrefaceThis is the harmonized CSA and UL Standard for Hu
32、midifiers. It is the fourth edition of CSA C22.2 No.104, superseding editions published in 2001, 1993, and 1983, and the fifth edition of UL 998.This harmonized Standard was prepared by the Canadian Standards Association (CSA) and UnderwritersLaboratories Inc. (UL). The efforts and support of the Ai
33、r Conditioning and Refrigeration Institute (ARI) andthe Heating, Refrigerating and Air Conditioning Institute of Canada (HRAI) are gratefully acknowledged.This Standard is considered suitable for use for conformity assessment within the stated scope of theStandard.This Standard was reviewed by the C
34、SA Subcommittee on Humidifiers under the jurisdiction of theTechnical Committee on Consumer and Commercial Products and the Strategic Steering Committee onRequirements for Electrical Safety, and has been formally approved by the Technical Committee.This standard has been approved by the American Nat
35、ional Standards Institute (ANSI) as an AmericanNational Standard.Where reference is made to a specific number of samples to be tested, the specified number isconsidered a minimum quantity.Note: Although the intended primary application of this standard is stated in its scope, it is important tonote
36、that it remains the responsibility of the users of the standard to judge its suitability for their particularpurpose.Level of harmonizationThis standard uses the IEC format but is not based on, nor is it considered equivalent to, an IEC standard.This standard is published as an identical standard fo
37、r (CSA, and UL). An identical standard is a standardthat is exactly the same in technical content except for national differences resulting from conflicts incodes and governmental regulations. Presentation is word for word except for editorial changes.InterpretationsThe interpretation by the standar
38、ds development organization of an identical or equivalent standard isbased on the literal text to determine compliance with the standard in accordance with the proceduralrules of the standards development organization. If more than one interpretation of the literal text has beenidentified, a revisio
39、n is to be proposed as soon as possible to each of the standards developmentorganizations to more accurately reflect the intent.CSA effective dateThe effective date for CSA International will be announced through CSA Informs or a CSA CertificationNotice.UL effective dateAs of April 25, 2011 all prod
40、ucts Listed or Recognized by UL must comply with the requirements in thisstandard.MAY 19, 2011CSA C22.2 NO. 104-11 UL 9986UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULA UL effective date is established by Underwriters Laboratories Inc. and
41、is not part of the ANSI approvedstandard.APRIL 25, 2011 CSA C22.2 NO. 104-11 UL 998 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULHUMIDIFIERSINTRODUCTION1 Scope1.1 These requirements cover humidifiers rated 600 V or less, and intended to be
42、 used in accordancewith the National Electrical Code (NEC), ANSI/NFPA 70, and the Rules of the Canadian Electrical Code(CEC), Part I, C22.1.1.2 These requirements cover humidifiers intended for residential and commercial use. This includeshumidifiers of the centrifugal atomizing type, evaporative-me
43、dia type, water-injection type, steam type,and the like. The humidifiers may be for installation in a room, mounted on a wall or a ceiling, or for ductor plenum mounting.1.3 These requirements apply to equipment that includes an electric heating element to heat air or water,or both.1.4 These require
44、ments do not apply to evaporative coolers that are also intended to be used for cooling.1.5 These requirements do not apply to portable, electrode-type products, such as vaporizers, which arecovered by the Standard for Electric Heating Appliances, UL 499, and the CSA Standard for HouseholdCooking an
45、d Liquid-Heating Appliances, CAN/CSA-C22.2 No. 64.2 Definitions2.1 The following definitions apply in this Standard:Circuit, extra-low-voltage A circuit that has an ac potential of not more than 30 V (42.4 peak), andpower of 100 VA or less; or 30 V dc supplied by a primary battery; or supplied by a
46、Class 2transformer; or supplied by a combination of a transformer and fixed impedance that, as a unit,complies with all the performance requirements for a Class 2 transformer. A circuit that is derived froma circuit which exceeds 30 V by connecting resistance or impedance, or both, in series with th
47、e supplycircuit to limit the voltage and current, is not considered to be an extra-low-voltage circuit.Circuit, hazardous voltage A circuit having characteristics in excess of those of an extra-low-voltagecircuit.Combination temperature-regulating and temperature-limiting thermostat A thermostat who
48、se functionis to regulate the temperature under normal conditions of use, and that also serves to prevent a hazardthat might result from conditions of abnormal operation of the heater.Enclosure The enclosure that houses the electrical components, live parts and/or moving parts. It maybe an integral
49、part of the component, a separate item, part of the ultimate enclosure, or the ultimateenclosure (e.g., the outer cabinet).Heater element A complete or partial assembly of a heating element, an electrical insulation (e.g.,refractory, mica), a metal sheath, a glass or quartz envelope or panel, thermal insulation, and a frameor adaptor for holding the assembly together and fastening it in the heater; and leads or terminalconnections, or both, which may or may not include bolts and
