What Is a Lamp Socket?

A lamp socket is a component that mechanically supports and electrically connects an electric light bulb base. It’s a key component in a lamp and without it, a lamp wouldn’t function. Lamp sockets also help keep a light fixture safe from electric shock. It is important to properly identify the type of socket you need for your lamp or fixture before purchasing a replacement. If you are unsure of the type of socket your fixture has, try using a voltage tester to confirm the presence of electricity.

Most light fixtures use standard Edison screw or medium base sockets for their bulbs. They have right-handed threads that allow them to be screwed into the socket clockwise and removed counterclockwise. They are used in a wide variety of lamps and chandeliers.

Other types of lamp bases include candelabra, bayonet-base and double-ended sockets. The latter are most commonly found in night lights and decorative lamps. They are used with two bulbs and can be controlled with a turn knob switch that operates either one bulb or both.

Sockets are also available in different styles and materials to suit the look of your fixture. Brass plated sockets are a good choice for use in antique lamps as their color harmonizes with many vintage finishes. Antique brass sockets have been darkened to appear aged, and are very useful in creating vintage designs. The metal body of the socket can be finished in a variety of colors, such as black or gold. It is best to match the finish of your sockets with the shade you plan to use for a uniform appearance.

Depending on the type of socket, it may be shunted or non-shunted. A shunted socket receives a single wire carrying current through it and spreads it across two contacts, while a non-shunted socket sends current to each of its contacts independently.

A non-shunted socket is the safest option as it prevents the hot screw of the socket from becoming energized when the bulb is removed or inserted incorrectly. A shunted socket, on the other hand, can become energized when the bulb is plugged in or removed and is not suitable for all applications.

If your sockets are not working, there may be a number of causes. First, make sure there is current in the fixture by using a voltage tester to touch the center of the socket’s bottom pin. If the tester lights up or beeps, the socket is functioning correctly. If the tester does not, then the socket itself could be the cause. If a problem is detected, disconnect the power to the fixture by switching off the circuit breaker or removing the fuse and check the socket for damage. If the socket is damaged, it should be replaced.