1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA LE 4-2012Recessed Luminaires, Ceiling CompatibilityNEMA LE 4-2012 Recessed Luminaires, Ceiling Compatibility Published by: National Electrical Manufacturers Association 1300 North 17th Street Rosslyn, Virginia 22209 www.nema
2、.org Copyright 2012 by the 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 Artistic Works, and the International and Pan American Copyright
3、 Conventions.LE 4-2012 Page ii Copyright 2012 by the 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 at the time it was develop
4、ed. 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 herein is one, are developed
5、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 fairness in the development of
6、 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 personal injury, property, or o
7、ther 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, express or implied, as to the accuracy or comp
8、leteness 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 products or services by virtue
9、 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 else. Anyone using this documen
10、t 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 available from other sources
11、, 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, designs, or installations for safet
12、y or health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. LE 4-2012 Page iii Copyright 2012 by the National Elec
13、trical Manufacturers Association TABLE OF CONTENTS Page FOREWORD iv Section 1 GENERAL . 1 1.1 SCOPE 1 1.2 DEFINITIONS 1 1.3 SUPPORT WIRES 1 Section 2 TYPES OF RECESSED FLUORESCENT LUMINAIRES 3 2.1 GENERAL INFORMATION . 3 2.2 TYPE F (FLANGED) 3 2.3 TYPE M (MODULAR) AND TYPE Z (Z SPLINE) 4 2.4 TYPE G
14、(GRID) . 7 2.5 TYPE GR (GRID-REGRESSED) 9 2.6 TYPE GN (GRID NEW) . 11 2.7 TYPE NFG (NARROW FACED GRID) . 13 2.8 TYPE NFSG (NARROW FACED SLOT GRID) 15 2.9 TYPE SS (SCREW SLOT) 17 LE 4-2012 Page iv Copyright 2012 by the National Electrical Manufacturers Association FOREWORD The purpose of this standar
15、ds publication is to establish standardized dimensions for recessed luminaires that, if adhered to, will ensure compatibility with conventional generic ceiling suspension systems. Compatibility, as referred to in this standards publication, means that luminaires will be designed to fit into ceiling
16、systems without causing distortion or misalignment of ceiling members and in such a manner as to ensure their proper support within the ceiling in accordance with the National Electrical Code. Compatibility further means that a luminaire will be placed in support systems in a symmetrical manner with
17、out oversized gaps existing between the luminaire and ceiling tiles or ceiling suspension members. It is not the intent of this standards publication to inhibit luminaire design or to impose arbitrary tolerances on any luminaire manufacturer. This standards publication does not attempt to establish
18、comprehensive ceiling grid system standards; other sizes and designs of ceiling systems may be used. However, NEMA-type luminaires may not be compatible with these non-defined systems. In the preparation of this standards publication input of users and other interested parties has been sought and ev
19、aluated. Inquiries, comments, and proposed or recommended revisions should be submitted to the Indoor Lighting Equipment Subdivision of NEMA by contacting: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17th Street Rosslyn, Virginia 22209 The standards
20、 or guidelines presented in a NEMA standards publication are considered technically sound at the time they are approved for publication. They are not a substitute for a product sellers or users own judgment with respect to the particular product referenced in the standard or guidelines, and NEMA doe
21、s not undertake to guarantee the performance of any individual manufacturers products by virtue of this standard or guide. Thus, NEMA expressly disclaims any responsibility for damages arising from the use, application, or reliance by others on the information contained in these standards or guideli
22、nes. This standard was developed by the Luminaire Section to supersede and replace the original NEMA LE 1-1974 and later NEMA LE 4-1987. Section approval of the standard does not necessarily imply that all section members voted for its approval or participated in its development. At the time it was
23、approved, the Luminaire Section was comprised of the following members: Amerillum Brands Amerlux Global Lighting Solutions Atlas Lighting Products, Incorporated BJB Electric L.P. Cooper Lighting Cree, Incorporated Deco Lighting EGS Electrical Group EiKO, Ltd. EYE Lighting International of N.A., Inco
24、rporated Full Spectrum Solutions, Incorporated GE Lighting Systems LE 4-2012 Page v Copyright 2012 by the National Electrical Manufacturers Association Hubbell Lighting, Incorporated Juno Lighting, Incorporated Lithonia Lighting, an Acuity Brands Company LumenOptix, LLC Luraline Lighting MagnarayInt
25、ernational Division World Institute of Lighting and Development Corporation MaxLite National Cathode Corporation Philips Lightolier RAB Lighting RENOVA Lighting Systems, Incorporated Satco Products, Incorporated Technical Consumer Products, Incorporated The Designers Edge Thomas therefore, a slight
26、bow or variation in overall dimensions is to be expected. 2.2 TYPE F (FLANGED) A Type F luminaire, as shown in Figure 2-1, is one having flanges which conceal the edges of the ceiling opening. The luminaire is mounted with integral adjustable supports. All luminaire dimensions are in inches and NW (
27、nominal width), NL (nominal length), and H (support height) must be coordinated. In Figure 2-1: NL = Nominal ceiling opening length. W = Nominal ceiling opening width. FW = Luminaire flange width, such that it adequately conceals ceiling opening and supporting hardware. FL = Luminaire flange length,
28、 such that it adequately conceals ceiling opening and supporting hardware. RW= Recessed housing width, less than or equal to (NW 1/16 in). LL = Luminaire length, less than or equal to NL. H = Support height. LE 4-2012 Page 4 Copyright 2012 by the National Electrical Manufacturers Association HFWRWFL
29、LLNLCross Section of Side Cross Section of EndNot to scaleNWFigure 2-1 TYPE F 2.3 TYPE M (MODULAR) AND TYPE Z (Z SPLINE) Type M and Z luminaires, as shown in Figure 2-2 and Figure 2-3, have flanges that align with the ceiling openings on all four sides. The luminaire is mounted from integral adjusta
30、ble hangers or other means of support. All dimensions are in inches and include out-of-square tolerances. W (modular width), L (modular length), and H (support height) must be coordinated. In Figure 2-2: L = Modular length dimensions. W = Modular width dimensions center-to-center of ceiling support
31、members. FW= Luminaire flange width, equal to W. FL = Luminaire flange length, equal to L. LL = Overall luminaire length, less than or equal to L. H = Support height. All ceiling dimensions shown in Figure 2-3 and designated with an asterisk (*) must be coordinated. All snap bars must run parallel t
32、o fixture length. *LE 4-2012 Page 5 Copyright 2012 by the National Electrical Manufacturers Association 13/16 - 1-1/2” = 1”13/16 - 1-9/16”15/16-7/8” = 1”“Z” Spline “H” Spline15/32”HFW FLLLCross Section of Side Cross Section of EndNot to scaleWLAdjustable Hanger on Each Corner5/16 - 3/8”Figure 2-2 TY
33、PE M AND TYPE Z (SPLINE) *LE 4-2012 Page 6 Copyright 2012 by the National Electrical Manufacturers Association *Snap-in Bar*3/4”Snap-in2-2/32”1/4”5/8”29/32”HAdjustable Luminaire Support BracketW LLLFW FLCross Section of Side Cross Section of EndNot to ScaleFigure 2-3 TYPE M AND TYPE Z (SNAP-IN) *LE
34、4-2012 Page 7 Copyright 2012 by the National Electrical Manufacturers Association 2.4 TYPE G (GRID) A Type G luminaire, as shown in Figure 2-4, is one having edges which rest on, and are supported by, exposed inverted tees configured in a grid pattern. If T-bar clips are integral with or are furnish
35、ed with the luminaire, they shall be field-secured to the inverted ceiling tees. All dimensions are in inches and include out-of-square tolerance. In Figure 2-4: L = Modular length dimension center-to-center of T-bar. W = Modular width dimension center-to-center of T-bar. EL = Luminaire edge length,
36、 equal to (L 1/4 in). A plus (+) tolerance of 3/32 in on edge length (EL) is permitted only if edge width (EW) does not exceed (W 1/4 in). A minus (-) tolerance of 1/8 in is permitted. EW = Luminaire edge width, equal to (W 1/4 in). A plus (+) tolerance of 1/8 in on edge with (EW) is permitted only
37、if edge length (EL) does not exceed (L 1/4 in). A minus (-) tolerance of 1/8 in is permitted. LL = Over-all luminaire length, less than or equal to L. ID-OD = Inside dimension-outside dimension. Note: Special luminaires have been introduced for clean room applications. The grid flange width may be a
38、s wide as 2 in and as high as 2 in The additional width is for gasketing purposes.LE 4-2012 Page 8 Copyright 2012 by the National Electrical Manufacturers Association MAX. 1/4”7/8” MIN.1” MAX.1/2”1-1/2” MAX.EWLLCross Section of Side Cross Section of EndNot to scaleW1/8” MIN.OFFSETID-OD1-1/2” MIN.OFF
39、SETID-ODELLFigure 2-4 TYPE G *LE 4-2012 Page 9 Copyright 2012 by the National Electrical Manufacturers Association 2.5 TYPE GR (GRID-REGRESSED) A Type GR luminaire as shown in Figure 2-5, is the same as a Type G luminaire, except the edges of the luminaire rest on and are supported by concealed inve
40、rted tees configured in a grid pattern. If T-bar clips are integral with, or are furnished with the luminaire, they shall be field-secured to the inverted ceiling tees. A separate regressed splay frame may be used to conceal the edges of the tile and supporting member. All dimensions are in inches a
41、nd include out-of-square tolerance. In Figure 2-5: L = Modular length dimension center-to-center T-bar. W = Modular width dimension center-to-center T-bar EL = Luminaire edge length, equal to (L 1/4 in). A plus (+) tolerance of 3/32 in on each length (EL) is permitted only if edge width (EW) does no
42、t exceed (W 1/4 in). A minus (-) tolerance of 1/8 in is permitted. EW = Luminaire edge width, equal to (W 1/4 in). A plus (+) tolerance of 1/8 in on edge width (EW) is permitted only if edge length (EL) does not exceed (L 1/4 in). A minus (-) tolerance of 1/8 in is permitted. LL = Over-all luminaire
43、 length, less than or equal to L. ID-OD = Inside dimension-outside dimension. LE 4-2012 Page 10 Copyright 2012 by the National Electrical Manufacturers Association MAX. 1/4”7/8” MIN.1” MAX.1/2”1-1/2” MAX.Not to scaleCross Section of Side Cross Section of EndSplay, or decorative trim, by ceilingmanuf
44、acturer. Size, shape, and colordecided by ceiling manufacturer.EWWLL1/8” MIN.OFFSETID-OD1-1/2” MIN.OFFSETID-ODELL =1/2”3/8” =1/2”Figure 2-5 TYPE GR *LE 4-2012 Page 11 Copyright 2012 by the National Electrical Manufacturers Association 2.6 TYPE GN (GRID NEW) A Type GN luminaire as shown in Figure 2-6
45、 is similar to a Type G luminaire, having edges which rest on, and are supported by exposed inverted tees configured in a grid pattern. T-bar clips integral with, or furnished with, the luminaire shall be field-secured to the inverted ceiling tees, and the luminaire shall be centered within the open
46、ing. All dimensions are in inches, and maximum dimensions include out-of-square tolerance. In Figure 2-6: L = Modular length dimension center-to-center T-bar. W = Modular width dimension center-to-center T-bar. EL = Luminaire edge length, equal to (L 1/4 in). A plus (+) tolerance of 3/32 in on edge
47、length (EL) is permitted only if edge width (EW) does not exceed (W 1/4 in). A minus tolerance of 1/8 in is permitted. EW = Luminaire edge width, equal to (W 1/4 in). A plus (+) tolerance of 1/8 in on edge width (EW) is permitted only if edge length (EL) does not exceed (L 1/4 in). A minus (-) toler
48、ance of 1/8 in is permitted. LL = Over-all luminaire length, less than or equal to L. ID-OD = Inside dimension-outside dimension. LE 4-2012 Page 12 Copyright 2012 by the National Electrical Manufacturers Association EWWELLCross Section of Side Cross Section of End1/8“ MIN.OFFSET 45DEGREES1-11/16“MIN
49、.OFFSETID-ODLL45 degrees.580“1.640“MAX.7/8“ MIN.1“ MAXNot to scaleFigure 2-6 TYPE GN *LE 4-2012 Page 13 Copyright 2012 by the National Electrical Manufacturers Association 2.7 TYPE NFG (NARROW FACED GRID) A Type NFG luminaire as shown in Figure 2-7 is similar to a Type G luminaire having edges which rest on and are supported by exposed inverted tees configured in a grid pattern. T-bar clips integral with or furnished with the luminaire shall be field-secured to the inverted ceiling tees, and the luminaire shall be centered with
