IEVref:845-08-15ID:
Language:enStatus: Obsolete
Term: cap
Synonym1: base, US
[Preferred]
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Definition: that part of a lamp which provides connection to the electrical supply by means of a lampholder or lamp connector and, in most cases, also serves to retain the lamp in the lampholder

NOTE 1 – The term base is also used in both the United Kingdom and the United States of America to denote an integral part of a lamp envelope which has been so shaped that it fulfills the function of a cap. It may engage either a holder or a connector, depending on other design features of the lamp- and holder system.

NOTE 2 – The cap of a lamp and its corresponding holder are generally identified by one or more letters followed by a number which indicates approximately the principal dimension (generally the diameter) of the cap in millimetres. The standard code is to be found in IEC Publication 61.


Publication date:1987
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