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ANSI C78.1401

4th Edition, January 1, 2004

Complete Document

Electric Lamps — Dimensions for Projection Lamps—Double-Contact, Medium Ring (Special B), Base-up Type

Includes all amendments and changes through Reaffirmation Notice , 2016

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ANSI C78.1402

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Description / Abstract:

This standard establishes the dimensions essential to the interchangeability of lamps of the double-contact, medium ring (Special B), base-up type. It is not intended to prescribe either operating characteristics or details of design, such as the shape of the ventilation ports or the method of attachment of the prefocus ring to the base.
ANSI/NEMA MW 1000, 2014