1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C78.21-2011 (R2016)Incandescent Lamps PAR and R Shapes 2016 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons
2、 engaged in the development and approval of the document 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. ANSI standards and guideline publications, of which the document containe
3、d herein 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 to promote fairness in the devel
4、opment 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 personal injury, prope
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6、acy 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 products or service
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8、his 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 available from ot
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10、s 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. ANSI C78.21-2011 (R2016) Page i 2016 Nati
11、onal Electrical Manufacturers Association AMERICAN NATIONAL STANDARD Approval of an American National Standard requires verification by The American National Standards Institute, Inc. (ANSI) that the requirements for due process, consensus, and other criteria for approval have been met by the standa
12、rds developer. An American National Standard implies a consensus of those substantially concerned with its scope and provisions. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly, and materially affected interests
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15、itute, Inc., does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute, I
16、nc. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on this title page. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute, Inc., require that action be
17、 taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute, Inc. Published by National Electrical Manufacturers Association 1300 North 1
18、7thStreet, Suite 900 Rosslyn, Virginia 22209 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 Artistic Works, and the International and
19、 Pan American copyright conventions. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America ANSI C78.21-2011 (R2016) Page ii 2016 National Electrical Manufac
20、turers Association Foreword (This foreword is not part of American National Standard C78.21) Suggestions for improvement of this standard should be submitted to the Secretariat C78, 1300 North 17thStreet, Suite 900, Rosslyn, VA 22209. This standard was processed and approved by the Accredited Standa
21、rds Committee on Electric Lamps, C78. Committee approval of the standard does not necessarily imply that all committee members voted for that approval. ANSI C78.21-2011 (R2016) Page iii 2016 National Electrical Manufacturers Association CONTENTS Foreword ii Part I General Information. 1 1 Scope 1 2
22、Normative References 1 3 Definitions and abbreviations. 2 4 Lamp designations 2 5 Bulb designations 3 6 Bulb finish. 3 7 Beam photometry and classification. 3 8 Lamp drawings. 3 9 Electrical characteristics. 4 10 Requirements. 4 11 Information on luminaire design 4 Part II Lamp Classes 7 Table 1 Sta
23、ndard Lamp Classes with PAR and R Bulbs. 7 Part III Lamp Space Drawings. 13 Part IV Product Drawings 31 Annex A Informative References 36 ANSI C78.21-2011 (R2016) Page iv 2016 National Electrical Manufacturers Association . ANSI C78.21-2011(R2016) Page 1 2016 National Electrical Manufacturers Associ
24、ation Part I General Information 1 Scope This standard provides physical and electrical characteristics of the group of incandescent lamps that have PAR and R bulb shapes. Lamps with clear, frosted, and lens end bulbs, with clear and prescription lenses, and with various reflector coatings are cover
25、ed. Lamps covered in this standard may contain either of two basic types of light sources: an incandescent filament or a tungsten halogen inner bulb. Sunlamps and heat lamps of the R type are included. Lamps with discharge arc tubes are not included. Other groups of incandescent lamp standards are a
26、ffected by this revision. Please see the normative paragraph below referencing 78.20, 78.22, and 78.23. At the time of issuance of this standard there was no comparable standard published by the International Electrotechnical Commission (IEC). 1.1 Important Patent Disclaimer At the time of publicati
27、on, it is possible that some of the elements of this document may be the subject of patent rights. When this Standard was approved for publication, the National Electrical Manufacturers Association (NEMA) did not know of any patent applications, patents pending, or existing patents. NEMA shall not b
28、e held responsible for identifying any or all such patent rights. 2 Normative References The following standards contain provisions, which through reference in this text constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All stand
29、ards 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 C78.20 American National Standard for Electric LampsA, G, PS, and Similar Shapes
30、with E26 Medium Screw Bases ANSI C78.22 American National Standard for Incandescent LampsA, G, PS, and Similar Shapes with E39 Mogul Screw Bases ANSI C78.23 American National Standard for Incandescent LampsMiscellaneous Types ANSI C78.30 American National Standard for Electric LampsProcedure for Use
31、 in Preparation of Lamp Space Drawings ANSI/IEC C78.60360 American National Standard for Electric Lamps Standard Method of Measurement of Lamp Cap Temperature Rise ANSI C78.60432:1 American National Standard for Electric LampsIncandescent LampsSafety Specifications, Part 1: Tungsten Filament Lamps f
32、or Domestic and Similar General Lighting Purposes ANSI C78.60432:2 American National Standards for Electric LampsSafety Specifications, Part 2: Tungsten Halogen (TH) Lamps for Domestic and Similar General Lighting Purposes ANSI C78.379 American National Standard for Electric LampsClassification of t
33、he Beam Patterns of Reflector Lamps ANSI C79.1 American National Standard for Nomenclature for Glass Bulbs Intended for Use with Electric Lamps ANSI C78.21-2011(R2016) Page 2 2016 National Electrical Manufacturers Association ANSI C81.61 American National Standard for Electrical Lamp Bases Specifica
34、tions for Bases (Caps) for Electric Lamps ANSI C81.63 American National Standard for Gauges for Electric Lamp Bases and Lampholders IESNA LM-20 IESNA Approved Method for Photometric Testing of Reflector-type Lamps1IESNA LM-45 IESNA Approved Method for Electrical and Photometric Measurements of Gener
35、al Service Incandescent Filament Lamps IESNA LM-54 IES Guide to Lamp Seasoning 3 Definitions and Abbreviations In addition to bulb and base codes that are defined in the referenced standards, some terms common to the industry are utilized in this standard and used in Table 1. 3.1 MOL (maximum overal
36、l length): Distance along the lamp axis from eyelet solder to top or face of the bulb. 3.2 LCL (light center length): Distance from the reference plane (eyelet solder for screw bases) to the center of the light-emitting filament of the lamp. 3.3 class: A grouping of like lamps having the same rated
37、wattage, bulb shape, base, MOL, and bulb finish, including two or more voltage ratings within a voltage range. Each line item in Table 1 is a class. 3.4 voltage range: A series of rated voltages related to commonly available supply lines. A footnote to Table 1 lists several common voltage ranges tha
38、t apply to classes of lamps in this standard. 3.5 rated wattage: Wattage marked on the lamp. See IESNA LM-45 for measurement of wattage. 3.6 rated voltage: The voltage marked on the lamp. If lamps are marked with a range voltage, it shall be interpreted that they are appropriate for use on any line
39、voltage within that range. Consult manufacturers catalog to determine design voltage. 3.7 base temperature rise: The surface temperature rises above ambient temperature of a standard test lampholder fitted to the lamp when measured according to the standard method. Maximum base temperature rise limi
40、ts apply to base-up burn position at which maximum temperature rise occurs unless lamps are restricted to other burn positions by their manufacturers. See ANSI/IEC C78.60360 for method of measurement. 3.8 service: The field of most common application for a given lighting source. Service indicated in
41、 this standard is not necessarily the only application. “Spotlight“ and “floodlight” are generic terms only used to describe either spot or flood light service. 4 Lamp Designations This standard does not place any control over lamp designations. Incandescent reflector lamps are generally designated
42、by wattage, bulb type, and voltage ratings. Additional codes may be applied by lamp manufacturers. See lamp manufacturers catalogs for more detailed information. 1Available from the Illuminating Engineering Society ANSI C78.21-2011(R2016) Page 3 2016 National Electrical Manufacturers Association 5 B
43、ulb Designations Bulb designations used in this standard are defined in ANSI C79.1 and used in Table 1. Since the traditional eighth-inch sizes have long been utilized in some lamp designations, they are so used in this standard. The metric equivalents are shown in parentheses. Certain bulbs are not
44、ed in Table 1 with “BR“ and “ER” designations, which are used by most manufacturers. These are the same as “RB“ and “RE“ bulb designations in ANSI C79.1. PAR is a designation that means “parabolic aluminized reflector” mostly applied to pressed hard glass, two-part (lens and reflector) reflector lam
45、ps. Some R-lamps are also made with hard glass, so noted in Table 1. PAR16 compact reflector lamps made with ceramic enclosures are also listed. Other R-lamps are made with soft glass, and soft glass is implied unless otherwise noted. 6 Bulb Finish 6.1 Reflector Bulbs used in PAR and R lamps usually
46、 have an internal metallic coating on the reflector section of the bulb for directing a light beam out through the lens. Sometimes dichroic coatings are used in the reflector section of the bulb, for selective transmission of infrared energy through that area. 6.2 Lens Only those R lamps with clear,
47、 inside-frosted, and lens end lens sections are considered in this standard unless otherwise noted. Similarly, PAR lamps with clear lenses, stippled patterns, or molded prescriptions are considered. Colored coatings are not covered unless specifically noted. 7 Beam Photometry and Classification See
48、IESNA LM-20 for method of photometry testing of reflector lamps. See ANSI C78.379 for information on classification of beam patterns. 8 Lamp Drawings 8.1 Lamp Space Drawings in Part III For each bulb-base-MOL category, lamp space drawings in Part III of this standard show the maximum limits of the space that may be occupied by any part of the bulb. A typical bulb shape is shown as a dashed line within that maximum space. The space shown shall accommodate
