1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C78.391-2004 (R2016)Electric Lamps Characteristics of Subminiature Lamps of T1 and T1-3/4 ShapesANSI C78.391-2004 (R2009, R2016) Page 1 2016 National Electrical Manufacturers Association C78.391-2004 (R2009, R2016) American
2、National Standard for Electric Lamps Characteristics of Subminiature Lamps of T1 and T1-3/4 Shapes Secretariat: National Electrical Manufacturers Association Approved: January 6, 2016 American National Standards Institute, Inc. ANSI C78.391-2004 (R2009, R2016) Page 2 2016 National Electrical Manufac
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17、retation of an American National Standard in the name of the ANSI. 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 CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time.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 ANSI req
18、uire that action be 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 ANSI. Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 R
19、osslyn, 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 Pan American copyrigh
20、t 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 C78.391-2004 (R2009, R2016) Page ii 2016 National Electrical Manufacturers Associa
21、tion Foreword (This Foreword is not part of ANSI C78.391-2004) Suggestions for improvement of this standard should be submitted to: Secretariat C78 National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 This standard was processed and approved by Accr
22、edited Standards Committee on Electric Lamps, C78. Committee approval of the standard does not necessarily imply that all committee members voted for that approval. ANSI C78.391-2004 (R2009, R2016) Page iii 2016 National Electrical Manufacturers Association CONTENTS Foreword. ii 1 Scope 1 2 Referenc
23、e Standards and Related Publications 1 3 Lamp Designations. 1 4 Bulb Designations 1 5 Bulb Finish 2 6 Base Specifications. 2 7 Electrical, Photometry, and Life Characteristics and Requirements. 2 8 Electrical, Photometry, Life, and Physical Requirement Tables 4 TABLES Table 1 T1 Bulb, SX4 Submidget
24、Flanged Base. 5 Table 2 T1 Bulb, GY1.3 Bi-pin Base. 5 Table 3 T1 Bulb, Wire Terminal. 5 Table 4 T1-3/4 Bulb, SX6 Midget Flanged Base. 6 Table 5 T1-3/4 Bulb, W2.1x4.9d Wedge Base. 7 Table 6 T1-3/4 Bulb, Wire Terminal. 8 Table 7 T1-3/4 Bulb, S5.7 Midget Grooved Base. 9 Table 8 T1-3/4 Bulb, GY3.2 Bi-pi
25、n Base 10 Table 9 T1-3/4 Bulb, E5 Midget Screw Base 11 ANSI C78.391-2004 (R2009, R2016) Page iv 2016 National Electrical Manufacturers Association ANSI C78.391-2004 (R2009, R2016) Page 1 2016 National Electrical Manufacturers Association 1 Scope This standard sets forth the physical and electrical c
26、haracteristics of those groups of subminiature incandescent lamps with T1 and T1-3/4 bulb shapes. Lamps with various base or termination configurations are included. 2 Reference Standards and Related Publications 2.1 Normative References When the following American National Standards, referred to in
27、 this standard, are superseded by a revision approved by the American National Standards Institute, the revision shall apply. ANSI C79.1-2002 Nomenclature for Glass Bulbs Intended for use with Electric Lamps ANSI/IEC C81.61-2003 Electrical Lamps Bases ANSI/IEC C81.63-2004 Gauges for Electrical Lamp
28、Bases and Lampholders ANSI C78.370.390lcd-2002 ANS for Electric LampsAmendments to ANSI C78.370-1997 and ANSI C78.390-1998 ANSI C78.390-1998 Method of Designation for Electric LampsMiniature and Sealed Beam Incandescent Lamps SAE Ground Vehicle Lighting Standards Manual, 2002 Edition 2.2 Related Pub
29、lications ANSLG SR25d-1997, Special Report on Assigned Miniature Lamp Codes 3 Lamp Designations Lamp number designations are assigned to miniature lamps according to ANSI C78.390. Numbers are assigned by the administrator of the Lamp Code Designation program. All lamp numbers covered by this standar
30、d are listed in Tables 1 through 9 along with their rated voltage and design amperes, MSCd (mean spherical candela), life, LCL (light center length), MOL (maximum overall length), and filament shape as requested in their original lamp code designation requests. If a manufacturer objects to a newly i
31、ssued lamp code designation number, see the resolution procedure in C78.370.390lcd supplement to C78.390. 4 Bulb Designations Bulb designations are defined in ANSI C79.1. Since the traditional eighth-inch sizes have long been utilized for lamps of this kind, their use is continued in this standard.
32、ANSI C78.391-2004 (R2009, R2016) Page 2 2016 National Electrical Manufacturers Association 5 Bulb Finish Unless otherwise indicated, the bulbs of all lamps in Tables 1 through 9 shall have a clear finish. 6 Base Specifications 6.1 Bases on finished lamps shall comply with the standard sheets in ANSI
33、 C81.61. Standard sheets for the gauges for checking bases are in ANSI C81.63. 6.2 Wire terminal type lamp bases are not standardized. They normally consist of lead wires extending from the lamp pinch/bead or butt seal to be used for an external connection. 7 Electrical, Photometry, and Life Charact
34、eristics and Requirements 7.1 The values of lamp voltage, current, and candela in Tables 1 through 9 are those rated or design values that apply at an initial time after the lamps have been aged or seasoned for 1% of rated life or 10 hours, whichever is less. See SAE Standard J573, Miniature Lamp Bu
35、lbs in SAE Ground Vehicle Lighting Standards Manual. 7.2 Lamp current and candela shall be measured at rated voltage or accelerated test voltage 0.1 volts. Lamps shall be operated at AC or DC voltage equal to their rated or accelerated test voltage. 7.3 For life testing the voltage shall also be mai
36、ntained at rated voltage or accelerated test voltage 0.1 volts. Life of lamps listed in the Tables is that from AC operation. Life of most T1 or T1-3/4 subminiature lamps may be substantially reduced from DC operation. Consult manufacturer for additional information. Also, life listed in the Tables
37、is that from laboratory testing, and not from testing in various applications. 7.4 Lamp Current No more than 20% of the test lamps shall deviate from the current specified for the relevant lamps listed in the Tables by more than an allowance of 10%. 7.5 Initial Candela No more than 20% of test lamps
38、 with clear finish shall deviate from the candela value specified for the relevant lamps in the Tables by more than an allowance of 25%. 7.6 Life Test lamps shall yield an average life to burnout of not less than that specified for the relevant lamps listed in the Tables as modified below to take in
39、to account the statistical effect of sample size. Sample size Allowable variation from specified life (%) 10-19 8 20-39 7 40-99 6 100 or more 5 ANSI C78.391-2004 (R2009, R2016) Page 3 2016 National Electrical Manufacturers Association 7.7 Estimated performance characteristics at other than design vo
40、ltage may be obtained by use of the following formulas. These are only approximations and the accuracy diminishes as V and V1become more widely separated. (Usually no more than 50% is acceptable.) 7.7.1 Current consumption of a lamp is approximately proportional to the 0.55 power of the voltage rati
41、o. Voltage ratio factor = 55.1VV, where V = Application Voltage and V1= Rated Voltage This voltage ratio factor when multiplied by the design current in amps approximates the new current at the application voltage. 7.7.2 Mean spherical candela of a lamp is approximately proportional to the 3.5 power
42、 of the voltage ratio. Voltage ratio factor = 5.31VV, where V = Application Voltage and V1= Rated Voltage This voltage ratio factor when multiplied by the rated candela approximates the new candela at the application voltage. 7.7.3 Life of a lamp is approximately proportional to the 12th power of th
43、e inverse voltage ratio. Voltage ratio factor = 121VV, where V = Application Voltage and V1= Rated Voltage. This voltage ratio factor when multiplied by the rated life hours approximates the new life at the application voltage. 7.7.4 Accelerated Life Tests: Since many of the lamps in this standard h
44、ave extremely long life, accelerated life testing (testing at higher than rated voltage) may be used to approximate the actual life at rated voltage in much less time. For reasonably accurate results the accelerated voltage should not exceed more than 150% of the rated voltage. The following formula
45、 may be used: voltage daccelerateat life Average121VV = voltage rated at lifeaverage eApproximatwhere V is accelerated voltage and V1is rated voltage. ANSI C78.391-2004 (R2009, R2016) Page 4 2016 National Electrical Manufacturers Association 8 Electrical, Photometry, Life, and Physical Requirement T
46、ables Tables 1 through 9 list rated voltage, design current and initial MSCd (Mean Spherical Candela) values, life, LCL (Light Center Length), MOL (Maximum Overall Length), and filament shapes of nine different groups of T1 and T1-3/4 subminiature lamp types, each group with common bulb size and bas
47、e types. Lamps are sorted by voltage in each Table. Most groups of lamps have common LCL and MOL values, and are provided at the top of their respective Tables. If LCL and MOL vary among some lamps in a Table, their LCL or MOL values are noted at the end of the Table (Tables 7 and 8). If LCL and MOL
48、 vary among most lamps in a Table, their LCL and MOL values are listed in separate columns (Table 9). Wire terminal lamps have MOL values only, but do not have LCL values. Definitions of LCL and MOL for each base type among these lamps are as follows: Base Type LCL MOL E5 Midget Screw End of eyelet solder to centroid of coil End of eyelet solder to top of bulb GY1.3 Bipin Bottom of base, excluding pins, to centroid of coil Bottom of base, excluding pins, to top of bulb GY
