1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C78.1406-2004 (R2015)Electric Lamps P28 Single-Contact Medium Prefocus-Based Projection Lamps for Base-Down Operation DimensionsC78.1406-2004 (R2008, R2015) American National Standard for Electric Lamps P28 Single-Contact Me
2、dium Prefocus-Based Projection Lamps for Base-Down Operation Dimensions Secretariat: National Electrical Manufacturers Association Approved: July 24, 2015 American National Standards Institute, Inc. 2015 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publ
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19、 Inc. Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 2015 National Electrical Manufacturers Association All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Conventio
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21、s of America ANSI C78.1406-2004 (R2008, R2015) Page ii 2015 National Electrical Manufacturers Association Foreword (This foreword is not part of American National Standard C78.1406-2004.) Suggestions for improvement of this standard should be submitted to Secretariat C78 National Electrical Manufact
22、urers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 This standard was processed and approved by Accredited Standards Committee on Electric Lamps, C78. Committee approval of the standard does not necessarily imply that all committee members voted for that approval. ANSI C78.14
23、06-2004 (R2008, R2015) Page iii 2015 National Electrical Manufacturers Association Contents Foreword ii 1. Scope . 1 2. Normative References 1 3. Dimensions . 1 4. Operating Position 1 Appendix . 3 Figures Figure 1 Dimensions for Single-Contact Medium Prefocus Base-Down Type Projection Lamps 2 ANSI
24、C78.1406-2004 (R2008, R2015) Page iv 2015 National Electrical Manufacturers Association ANSI C78.1406-2004 (R2008, R2015) Page 1 2015 National Electrical Manufacturers Association 1. Scope 1.1 This standard establishes the dimensions essential to interchangeability of single-contact medium prefocus
25、based projection lamps of T-10 and T-12 bulb sizes. It is not the intent to prescribe operating characteristics or details of design. 2. Normative References 2.1 The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard
26、. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI C78.370
27、-1997, Method for the designation of photo lamps ANSI C79.1-2002, Nomenclature for Glass Bulbs Intended for Use with Electric Lamps ANSI C81.61-2003, Specifications for Bases (Caps) for Electric Lamps 2.2 Lamp Code Designations: Incandescent projection lamps are usually identified by a three-letter
28、code, as specified in American National Standard Method for the Designation of Photo Lamps, ANSI C78.370. 3. Dimensions 3.1 The dimensions and characteristics of the lamp base, IEC base designation P28s, shall comply with American National Standard Specifications for Electric Lamp Bases ANSI C81.61.
29、 3.2 The dimensions shall be as specified in Figure 1 and its accompanying table. The plane of the filament bisects the base flanges within 5. The filament shall be centered on base axis within 0.030 in (0.76mm) in both front and side views. 4. Operating Position 4.1 Lamps of this type are intended
30、to be burned with the axis in an essentially vertical position with the base at the bottom. ANSI C78.1406-2004 (R2008, R2015) Page 2 2015 National Electrical Manufacturers Association Inches Millimeters Dimensions* T-10 T-12 T-10 T-12 A B C (Note 1) D (Note 2) E (Note 1) F G H 1.294 max 4.797 max 0.
31、725 max 3.485 min 0.668 max 2.187 0.030 1.323 nom 5.750 max 1.546 max 4.797 max 0.850 max 3.485 max 0.785 max 2.187 0.030 1.323 nom 5.750 max 32.87 max 121.84 max 18.42 max 88.52 min 16.97 max 55.55 0.76 33.60 nom 146.05 max 39.27 max 121.84 max 21.59 max 88.52 min 19.94 max 55.55 0.76 33.60 nom 146
32、.05 max * Angular dimensions are nominal. NOTES 1 Dimensions C and E define the maximum excursion of the bulb surfaces from the base axis toward the condensing lenses (Dimension E) and the mirror (Dimension C). Therefore, the lamp chimney, the mirror, and the condensing lenses, and their respective
33、mounts, must be so located as to ensure adequate clearance between these parts and the bulb surface. 2 Dimension D applies to those projection lamps having opaque end coatings. However, there are exceptions, the specifications of which are supplied by the equipment manufacturer. Figure 1 Dimensions
34、for Single-Contact Medium Prefocus Base-Down Type Projection Lamps ANSI C78.1406-2004 (R2008, R2015) Page 3 2015 National Electrical Manufacturers Association Appendix (This Appendix is not a part of American National Standard Dimension C78.1406-2004, but is included for information only.) A1 The lo
35、cation of the lamp in a holder is determined by the winged flanges on the base shell. The top surface of the flanges determines the vertical location, the diameter of the flanges determines the lateral location, and the leading edge of the large angular flange section determines the rotational align
36、ment. A2 The terms “T-10” and “T-12” define the general shape and nominal diameter of the bulb. The letter “T” is an abbreviation for tubular; the numbers relate to the nominal diameter in eights of an inch; for example, T-10 is a tubular bulb 10/8 or 1-1/4 inches in diameter. See American National
37、Standard Nomenclature for Glass Bulbs Intended for Use with Electric Lamps, ANSI C79.1. NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
