ANSI C78.21-2003 白炽灯 PAR和R型.pdf

ANSI C78.21-2003
Revision of ANSI C78.21-1995 with all supplements
American National Standard
I Approved October 30, 2003
Secretariat Anslg-national Electrical Manufacturers Association
For Electric Lamps
PAR and R Shapes
An American National Standard implies a consensus of those substantially concerned with its scope and provisions. It is intended
as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does
not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or
using products, processes, or procedures not conforming to the standards. Users are cautioned to obtain the latest editions
The American National Standards Institute 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
CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time.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
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Standards Institute
Copyright O 2003 by American National Standard Lighting GROUP-NEMA
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ANSI C78.21-2003
Revision of ANSI C78. 21-1995 with all supplements
American
Approval of an American National Standard requires verification by ANSI that
the requirements for due process, consensus, and other criteria for approval
National
have been met by the standards developer. An American National Standard
mplies a consensus of those substantially concerned with its scope and
Standard
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 unanimity
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, purchasing, or using products, processes, o
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 T
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. 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 t