1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C78.1402-2004For electric lampsDimensions forProjection LampsG17q and GX17q BasedFour-pin, Prefocus, forBase-down OperationANSI C78.1402-2004 Revision of ANSI C78.1402-1975 American National Standard Approved: July 8, 2004 S
2、ecretariat: ANSLG -National Electrical Manufacturers Association For Electric Lamps Dimensions for Projection Lamps G17q and GX17q Based Four-pin, Prefocus, for Base-down Operation Copyright g211 2004 by American National Standard Lighting Group - NEMA 1ANSI C78.1402-2004 Revision of ANSI C78.1402-1
3、975 American National Standard Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. An American National Standard implies a consensus of those substantially
4、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. Substantial agreement means much more than a simple majority, but not necessarily unani
5、mity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The existence of an American National Standard does not in any respect preclude anyone, whether s/he has approved the standard or not, from manufacturing, marketing, pur
6、chasing, or using products, processes, or procedures not conforming to the standards. It is intended as a guide to aid the manufacturer, the consumer, and the general public. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of a
7、ny 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. Requests for interpretations should be addressed to the Committee Secretariat referred to on the
8、title page. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may rec
9、eive current information on all standards by calling or writing the American National Standards Institute. Printed and distributed by: Information Handling Services/Global Engineering Documents 15 Inverness Way East, Englewood, CO 80112-5776 Under Contract with National Electrical Manufacturers Asso
10、ciation Copyright g2112004 by American National Standard Lighting Group In Affiliation with National Electrical Manufacturers Association All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission o
11、f the publisher. Printed in the United States of America Copyright g211 2004 by American National Standard Lighting Group - NEMA 2ANSI C78.1402-2004 Revision of ANSI C78.1402-1975 Contents Page Foreword4 1 Scope5 2 Normative References.5 3 Dimensions.5 4 Operating Position5 Figure 1 : Dimensions for
12、 Double-Contact, Medium Ring (Special B), Base-up Projection Lamp.6 Appendix.7 A1 Operation above 100 Volts7 A2 Internal Reflector.7 A3 Bulb Designations.7 A4 Base Types.7 Copyright g211 2004 by American National Standard Lighting Group - NEMA 3ANSI C78.1402-2004 Revision of ANSI C78.1402-1975 Forew
13、ord (This foreword is not part of American National Standard C78.1402-2004) Suggestions for improvement of this standard should be submitted to the Secretariat C78, American National Standard Lighting Group (NEMA), 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209. This standard was processed an
14、d approved by Accredited Standards Committee on Electric Lamps, C78, and its Working Group, C78 WG 01. Working Group approval of the standard does not necessarily imply that all working group members voted for that approval. Information concerning approval of this standard is based on the documents
15、listed in the table below. Editors Note: During the final editorial review, changes were made to select sections of this published document only, and not to the working base document. Amendment / Change CDV RV Revision C78_1_4161 C78_1_4162David Mullen, Chairman, ASC 78 Randolph N. Roy, ANSLG Secret
16、ariat the numbers relate to the nominal diameter in eights of an inch; for example, T-10 is a tubular bulb 10/8 in (1-1/4 in) in diameter. A4 Base Types There are two types of the four-pin, prefocus base in current use. One has three bosses spaced as approximately 120 intervals; the other has a raised ring around the base shell. Both variations are usually interchangeable. 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
