Edison screw
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The Edison screw fitting is a system of light bulb connectors, developed by Thomas Edison in 1909 under the Mazda trademark. The designation Exx refers to the diameter in millimeters, e.g. E27 has a diameter of 27 mm.
In America the standard size is E26, although E12 is used for candelabra fixtures and E10 on some Christmas lights. E17 is also common, especially in some table lamps. In most countries which use 230-240 volts AC domestic power, E27 and E14 are common sizes, although the Bayonet mount is also used.
Larger sizes are used for higher powered lighting, like streetlights and floodlighting.
[edit] Edison screw cap fittings
| Type | Size Ø | Name | IEC |
|---|---|---|---|
| E5 | 5mm | Lilliput Edison Screw (LES) | IEC 60061-1 (7004-25) |
| E10 | 10mm | Miniature Edison Screw (MES) | IEC 60061-1 (7004-22) |
| E12 | 12mm | Candelabra Edison Screw (CES) | IEC 60061-1 (7004-28) |
| E14 | 14-17mm | Small Edison Screw (SES) | IEC 60061-1 (7004-23) |
| E17 (110v) | 14-17mm | Small Edison Screw (SES) | IEC 60061-1 (7004-26) |
| E26 (110v) | 26-27mm | (Medium) Edison Screw (ES) | IEC 60061-1 (7004-21A-2) |
| E27 | 26-27mm | (Medium) Edison Screw (ES) | IEC 60061-1 (7004-21) |
| E40 | 40mm | Giant Edison Screw (GES) | IEC 60061-1 (7004-24) |
[edit] See also
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