The use of fluorescent lighting has become commonplace in new homes and remodeling projects. Fluorescent lights have a longer lifespan, and use less electricity, and produce less heat than incandescent bulbs. But sometimes a fluorescent light socket needs to be replaced. You absolutely need to know which type of fluorescent light sockets is required for the lamp.
There are many different types of fluorescent lighting. They all fall into one of three categories: preheat, rapid start, and instant start. In all cases, the correct socket must be used when repairing the unit. A lamp using the incorrect fluorescent light socket can melt the wiring, damage the lamp, or create a fire hazard.
Sockets are available in medium and tall profiles. They are also grouped into shunted or non-shunted sockets.
Shunted sockets are used with instant-start ballasts and use a single track for the electrical current. The unit joins two points on a circuit with a conductor. The electrical current to travels from the ballast through the socket to the lamp pins. Many of the shunted socket holders have a large S on the back of the socket.
Non-shunted sockets are used with programmed-start ballasts and are not joined. They have two separate points of entry for the wires. This creates two tracks for the electrical current to travel.
It is not easy to visibly notice the difference in the sockets. Some can be identified by the number of wires going into the base of the socket. However, to correctly identify which socket is required, test the socket using a voltage meter.
Knowing which replacement fluorescent light socket is appropriate for your light fixture is important for safety. Before replacing the socket use proper safety. Ensure the power is cut off to the light at the circuit breaker. After shutting off the power, use a voltage meter to check that there is no power to the unit.
