NEMA OS 4-2016 Requirements for Air- Sealed Boxes for Electrical and Communication Applications.pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA OS 4-2016Requirements for Air-Sealed Boxes for Electrical and Communication ApplicationsNEMA OS 4 Requirements for Air-Sealed Boxes for Electrical and Communication ApplicationsPublished by National Electrical Manufacturers

2、Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2016 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Art

3、istic Works, and the International and Pan American copyright conventions. 2016 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document

4、 at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained he

5、rein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process and establishes rules to promote fai

6、rness in the development of consensus, it does not write the document and it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any pers

7、onal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, expressed or implie

8、d, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturer or sellers p

9、roducts or services by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone el

10、se. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may be

11、 available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, design

12、s, or installations for safety or health purposes. Any certification or other statement of compliance with any health- or safety-related information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. NEMA OS 4-2016 Page i 2

13、016 National Electrical Manufacturers Association CONTENTS Foreword ii Section 1 General 1 1.1 Scope . 1 1.2 References 1 1.3 Definitions 2 Section 2 Construction 3 Section 3 Performance Criteria . 4 3.1 Air Leakage Performance 4 Section 4 Test Method . 5 4.1 Procedure 5 4.1.1 General 5 4.1.2 Sampli

14、ng 5 4.2 Sample preparation . 5 4.2.1 Assembly of Wiring Methods . 5 4.2.2 Mounting in Test Chamber 5 4.3 Air Flow Measurement . 7 Section 5 Marking and Documentation . 8 5.1 Product Marking 8 5.2 Installation Instructions 8 FIGURES 1 Inside Chamber Door with Boxes Mounted 6 2 Inside Chamber Door wi

15、th Boxes Mounted 6 3 Block Diagram of Blower Door/Duct Leakage Style Test Apparatus .A-1 4 Fabricated Test Chamber with Test Panel Installed A-2 5 Air Exhaust/Calibration Chamber .A-2 6 Air Diffuser in Test Chamber A-3 ANNEXES A Description of Typical Blower Door/Duct Leakage Style Apparatus for Int

16、ernal Air Leakage Measurements A-1 B Applicable Building and Energy Codes and Other Resources B-1 NEMA OS 4-2016 Page ii 2016 National Electrical Manufacturers Association Foreword Building and energy codes for energy-efficient construction place a high priority on preserving the building thermal en

17、velope. Installation of doors; windows; and mechanical, electrical, and other systems within exterior walls and ceilings and other separations between conditioned and unconditioned spaces results in penetrations in the air barrier. When these penetrations are not effectively sealed, the air barrier

18、is compromised, resulting in air leakage, both in and out, which increases the energy usage necessary to maintain the desired condition of the air inside the structure. Besides external walls and ceilings in a building, uninsulated interior walls and interior floor-ceiling cavities not designed spec

19、ifically for air exchange, present pathways for air leakage. Even though air barriers are not commonly installed here, consideration should be given to using effective sealing techniques at wall, ceiling, and floor penetrations in these areas. Sealing air-barrier penetrations is not always as simple

20、 as applying more insulation, caulk, or expanding foam. Products such as electrical outlet boxes, having design features that address effective sealing of the air-barrier penetrations, also reduce potentially undesirable effects that can result from the use of unspecified sealing techniques. Annex B

21、 of this standard provides pertinent references to the applicable building and energy codes and to other helpful references. In the preparation of this standards publication, input of users and other interested parties has been sought and evaluated. Inquiries, comments, and proposed or recommended r

22、evisions should be submitted by contacting: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 This standards publication was developed by the Outlet and Switch Box Section. Section approval does not necessaril

23、y imply that all section members voted for its approval or participated in its development. At the time it was approved, the section was composed of the following members: 2D2C, Inc.http:/Lincolnshire, IL Allied Moulded Products, Inc. http:/Bryan, OH Arlington Industries, Inc.http:/Scranton, PA Eato

24、ns B-Line Businesshttp:/Highland, IL Crouse-Hinds by Eatonhttp:/www.crouse-Syracuse, NY Emerson Automation Solutionshttp:/ IL Pentair Engineered Electrical & Fastening Solutionshttp:/Solon, OH Hubbell Incorporatedhttp:/Shelton, CT Legrand/Pass & Seymourhttp:/Syracuse, NY RACOhttp:/ Bend, IN Sigma El

25、ectric Manufacturing Corporationhttp:/Garner, NC Southwire Companyhttp:/ GA Thomas & Betts, A Member of the ABB Grouphttp:/Memphis, TN Wiremold/Legrandhttp:/West Hartford, CT NEMA OS 4-2016 Page 1 2016 National Electrical Manufacturers Association Section 1 General 1.1 Scope This standard establishe

26、s a performance test and classification scheme for outlet boxes: wall boxes, ceiling boxes, and floor boxes used for electrical and communication applications having design provisions for reducing the flow of air (air leakage) through the box and at its installed interface with the building structur

27、e, when installed as intended for normal use as instructed by the manufacturer. The classification scheme in this standard meets the intent of the International Energy Conservation Code (IECC) and covers boxes installed in walls, ceilings, and floors where an air barrier is required. This standard d

28、oes not cover design or performance of electrical outlet boxes that are addressed in ANSI/UL 514A, CSA C22.2 No.18.1, NMX-J-023-ANCE, ANSI/UL 514C, CSA C22.2 No.18.2, ANSI/NEMA OS1, ANSI/NEMA OS2, IEC 60670-1, IEC 60670-21, or IEC 60670-23. This standard does not cover environmental classifications

29、for boxes or enclosures addressed in ANSI/UL 50E, CSA C22.2 No. 94.2, or NMX-J-235/2-ANCE. 1.2 References The following normative documents contain provisions that through reference in this text constitute provisions of this standards publication. By reference herein, these publications are adopted,

30、 in whole or in part as indicated, in this standards publication. Unless otherwise stated, references are to the latest edition of the standard. ASTM International (ASTM) 100 Barr Harbor Drive West Conshohocken, PA 19428-2959 ASTM E283-04 (2012), Standard Test Method for Determining Rate of Air Leak

31、age Through Exterior Windows, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen Association of Standards and Certification (ANCE) Av. Lzaro Crdenas No. 869 Nueva Industrial Vallejo Ciudad de Mxico C.P. 07700 Mxico NMX-J-023-ANCE, Metallic Outlet Boxes NMX-J-235/2-ANCE

32、, Enclosures for Electrical Equipment, Environmental Considerations Canadian Standards Association (CSA) 5060 Spectrum Way Mississauga, ON L4W 5N6 Canada CSA C22.2 No.18.1-13, Metallic outlet boxes CSA C22.2 No.18.2-06 (R2016), Nonmetallic outlet boxes CSA C22.2 No. 94.2-15, Enclosures for electrica

33、l equipment, environmental considerations NEMA OS 4-2016 Page 2 2016 National Electrical Manufacturers Association International Electrotechnical Commission (IEC) 3, rue de Varemb, 1stFloor Case postale 131 CH -1211 Geneva 20 Switzerland IEC 60670-1:2015, Boxes and enclosures for electrical accessor

34、ies for household and similar fixed installationsPart 1: General requirements IEC 60670-21:2004+AMD1:2016 CSV, Boxes and enclosures for electrical accessories for household and similar fixed installationsPart 21: Particular requirements for boxes and enclosures with provision for suspension means IE

35、C 60670-23:2006+AMD1:2016 CSV, Boxes and enclosures for electrical accessories for household and similar fixed installationsPart 23, Particular requirements for floor boxes and enclosures International Code Council (ICC) 500 New Jersey Avenue, NW, 6thFloor Washington, DC 20001 International Energy C

36、onservation Code (IECC)-2015 Underwriters Laboratories (UL) 333 Pfingsten Road Northbrook, IL 60062 ANSI/UL 50E, Enclosures for Electrical Equipment, Environmental Considerations ANSI/UL 514A, Metallic Outlet Boxes ANSI/UL 514C, Standard for Nonmetallic Outlet Boxes, Flush-Device Boxes, and Covers 1

37、.3 Definitions air barrier: Material(s) assembled and joined together to provide a barrier to air leakage through the building envelope. An air barrier may be a single material or a combination of materials. IECC 2015 For the purpose of this standard, a box providing sealing at the air barrier is a

38、component of the air barrier. air-sealed boxes: Electrical or communication boxes that are classified and comply with the appropriate provisions of this standard. building thermal envelope: Basement walls, exterior walls, floor, roof, and any other building elements that enclose conditioned space or

39、 provide a boundary between conditioned space and exempt or unconditioned space. IECC 2015 conditioned space: An area or room within a building being heated or cooled, containing uninsulated ducts, or with a fixed opening directly into an adjacent conditioned space. NEMA OS 4-2016 Page 3 2016 Nation

40、al Electrical Manufacturers Association Section 2 Construction The products construction shall comply with all requirements of the relevant product standards in accordance with applicable electrical codes. Note: Consideration should be given to the impact on compliance with provisions of other stand

41、ards and requirements for outlet boxes when adapted for classification to this standard. Among these considerations are flammability and temperature rating of materials, electrical continuity (bonding) between metallic components, and the impact on fire resistance ratings for boxes in fire-resistive

42、 walls and floor-ceiling assemblies. NEMA OS 4-2016 Page 4 2016 National Electrical Manufacturers Association Section 3 Performance Criteria 3.1 Air Leakage Performance Boxes that penetrate the air barrier of the building thermal envelope shall limit air leakage between conditioned and unconditioned

43、 spaces when installed as intended. When tested in accordance with section 4, boxes shall have an air leakage rate no greater than 2.0 cubic feet per minute (CFM) (0.944 L/s) at 1.57 psf (75 Pa) test pressure differential. NEMA OS 4-2016 Page 5 2016 National Electrical Manufacturers Association Sect

44、ion 4 Test Method 4.1 Procedure 4.1.1 General The procedure for determining the rate of air leakage through electrical outlet boxes shall be in accordance with ASTM E283. 4.1.2 Sampling The aggregate opening of all samples tested shall be a minimum of 75 in. The samples tested shall be of the same c

45、onstruction and type. 4.2 Sample Preparation 4.2.1 Assembly of Wiring Methods Assembly shall be in accordance with the manufacturers instructions when provided. 4.2.1.1 Boxes for Use with Cable or Tubing and Conduit Boxes having provision for conduit or tubing and cable shall be separately tested ac

46、cording to 4.2.1.2 and 4.2.1.3, as applicable. 4.2.1.2 Boxes for Use with Cable Only Boxes for use with cable shall be tested with one cable and a cable fitting, if required. The largest size cable for which the box is intended shall be tested. 4.2.1.3 Boxes for Use with Conduit or Tubing Only Boxes

47、 for use with conduit or tubing shall be tested as an assembly, with one conduit or tube of the largest trade size for which the box is intended attached by a fitting, if required. The conduit or tube shall be of a length that fits within the test chamber and shall be sealed at the end opposite the

48、box entry. 4.2.2 Mounting in Test Chamber 4.2.2.1 Boxes shall be mounted to the front wall of the test chamber in a fashion that replicates how the sealing feature of the box interacts with the drywall or floor in a typical installation (See Figures 1 and 2). 4.2.2.2 A cut-out of the appropriate size for the box shall be provided in the front wall of the test chamber with a minimum -inch clearance on all sides. A rigid support plate of a width not exceeding inch may be used to secure the box