Bnc Lamp
Bnc Lamp

Bayonet mount
Uses
This style of connector was named after its original use for soldiers who need to mount bayonets to the ends of their rifles in a hurry. The same need also applies to photographers who may need to change lenses quickly.
Several classes of electrical cable connectors, including audio, video, and data cables use bayonet connectors. Examples include BNC, C, and ST connectors.
Home light bulbs (230/240 V mains voltage) in India, Australia, Ireland, New Zealand, the UK, Middle East and, in older installations, France, also have this type of "B" base, as well as the Edison screw (E) base used in the United States, Japan and other countries. These bulbs have two pins on opposite sides of the cap; however, some specialized bulbs have three pins (cap designation B22d-3) to prevent use in domestic light fittings. Examples of three pin bulbs are found in mercury street lamps and fireglow bulbs in some older models of electric fire. Bayonet cap bulbs are very common worldwide in applications where vibration may loosen conventional bulbs, such as automotive lighting and other small indicators, and in many flashlights.
Some bulbs may have slightly offset lugs to ensure they can be only inserted in one direction; this is particularly true in bulbs like the 1157 automobile tail-light which has two different filaments to act as both a running light and a signal light. In the 1157 automotive bulb, each filament has a different brightness and is connected to a separate contact on the bottom of the base, the two contacts being symmetrically positioned about the axis of the base (unlike a 3-way medium screw base in which the two filament contacts are a center circle and a ring,) so proper orientation of the bulb is necessary to connect each filament to the correct separate circuit. Newer bulbs use a wedge base which does not have this issue.
Bayonet bases or caps are often abbreviated to BC, often with a number after. The number refers to the diameter of the base (e.g., BC22 is a 22 mm diameter bayonet cap lamp). BC15, a 15 mm base, can also be referred to as SBC standing for small bayonet cap. The lowercase letter s or d refers to whether there are one (single) or two (double) contacts on the bottom of the bulb.
Bulb bayonet mounts
Compact fluorescent lamp with double contact B22d bayonet mount
Incandescent light bulb with double contact B22d bayonet mount, and corresponding socket with sprung connectors
Preceding bulb mounted in the socket
LED lamps with GU10 bi-pin twist-lock mount
Incandescent 40 W BA15d bulb
See also: Automotive lamp types
Type
IEC
DIN
ANSI
B15d
IEC 60061-1 (7004-11)
DIN 49721
BA15d
IEC 7004-11 A
DIN 49720
BA15s
IEC 7004-11 A
DIN 49720
BA20d
IEC 7004-12
DIN 49730
B21s-4
B22d
IEC 60061-1 (7004-10)
BY22d
B24s-3
GU10
IEC 60061-1 (7004-121)
GZ10
IEC 60061-1 (7004-120)
GU24
Pending (Mar 2007)
While G actually indicates bi-pin, those listed above have a twist-lock, but with parallel pins from the end instead of opposing pins on the side.
These are the available sizes in the UK:
Designation
Alternative designation
Contacts
Dimension, etc.
BA5s
1
5 mm
BA7s
1
7 mm
BAX9s
1
9 mm
BA9s
Miniature bayonet cap (MBC)
1
9 mm
BA15d
Small bayonet cap (SBC)
2
15 mm
BAX15s
1
15 mm
BA15s
Single centre contact (SCC)
1
15 mm
BA20s
1
20 mm
BA20d
2
20 mm
BA21d
2
21 mm
B21-4
21 mm 4 pin
BA22d
Bayonet cap (BC)
2
22 mm
BC-3
Bayonet cap (BC)
2
22 mm 3 bayonet pins
B22d-3
2
22 mm double ended (railway)
BX22d
2
22 mm
Of these, only the BC (BA22d) is widely used in homes.
References
^ see http://technical.greenstock.co.uk/KYBLampBases.htm
IEC 61184: Bayonet lampholders, International Electrotechnical Commission, 1997. (also: BS EN 61184) specifies requirements and tests for the B15 and B22 bayonet holders for light bulbs used in some Commonwealth countries
See also
Bipin
Arri bayonet
Lens mount
Joseph Swan
Bayonet - a type of knife that attaches to a rifle.
External links
GU-24 Goes Mainstream
Line-voltage Socket Design Competition (GU24)
Categories: Fasteners | Light sockets
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