1、 ANSI C78.1401-2004 Revision of ANSI C78.1401-1975 American National Standard for electric lamps Dimensions for Projection Lamps Double-Contact, Medium Ring (Special B), Base-up Type ANSI C78.1401-2004 Revision of ANSI C78.1401-1975 American National Standard Approved: June 14, 2004 Secretariat: ANS
2、LG -National Electrical Manufacturers Association For Electric Lamps Dimensions for Projection Lamps Double-Contact, Medium Ring (Special B), Base-up Type Copyright g211 2004 by American National Standard Lighting Group NEMA Page 1 of 6 ANSI C78.1401-2004 Revision of ANSI C78.1401-1975 American Nati
3、onal 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 concerned with it
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7、nal 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 title page. CAUTI
8、ON NOTICE: This American National Standard may be revised or withdrawn at any time.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 receive current info
9、rmation 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 Association Copyright
10、 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 of the publisher.
11、Printed in the United States of America Copyright g211 2004 by American National Standard Lighting Group NEMA Page 2 of 6 ANSI C78.1401-2004 Revision of ANSI C78.1401-1975 Contents Page Foreword4 1 Scope5 2 Normative References.5 3 Operating Position5 4 Electrical Contacts5 Figure 1 : Dimensions for
12、 Double-Contact, Medium Ring (Special B), Base-up Projection Lamp6 Copyright g211 2004 by American National Standard Lighting Group NEMA Page 3 of 6 ANSI C78.1401-2004 Revision of ANSI C78.1401-1975 Foreword (This foreword is not part of American National Standard C78.1401-2004) Suggestions for impr
13、ovement 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 and approved by Accredited Standards Committee on Electric Lamps, C78, and its Sub-Committee, C78
14、WG 01. Committee approval of the standard does not necessarily imply that all committee members voted for that approval. Information concerning approval of this standard is based on the documents listed in the table below. Editors Note: During the final review, editorial changes were made to select
15、sections of this published document only, and not to the working base document. Amendment / Change CDV RV Revision C78_1_4159 C78_1_4160David Mullen, Chairman, ASC 78 Randolph N. Roy, ANSLG Secretariat however, the terminals should not exceed boat-shaped areas 0.250 in wide X 0.410 in long with the
16、long axes parallel to the flats on the ring. With lamps of this type, the prefocus ring is not an electrical contact. Copyright g211 2004 by American National Standard Lighting Group NEMA Page 5 of 6 ANSI C78.1401-2004 Revision of ANSI C78.1401-1975 Copyright g211 2004 by American National Standard
17、Lighting Group NEMA Page 6 of 6 NOTE: These dimensions define the maximum excursion of the bulb surfaces from the base axis toward the condensing lenses and the mirror, at the points indicated when the lamp is inserted in a holder which rotationally positions the lamp. (See the end view of the lamp base.) Therefore, the mirror and condensing lenses, and their respective mounts, must be so located as to ensure adequate clearance between these parts and the bulb surface. Fig. 1 Dimensions for Double-Contact, Medium Ring (Special B), Base-Up Projection Lamp
