When it comes to dealing with your T-8 sockets for fluorescent T8 LED tubes, it’s important to understand the difference between shunted and non-shunted varieties. If you use the wrong type, it can pose a serious hazard and can cause irreparable damage to LED tube. It will also cause a short, blackening the socket. Typically, you need an electrician to complete the retrofit process, due to the re-wiring that is involved. It’s critical that the existing G13 sockets are inspected in order to determine how the contacts within the socket functions. More than 90% of fluorescent fixtures use either shunted or non-shunted socket types, with 120v wiring.
Determining Type of Socket
You can use a voltage meter to determine the type of socket that is in the fluorescent fixture. Set the meter to the ‘continuity’ setting. If there is positive continuity showing in the two socket contacts, then the power is flowing between the contacts, meaning that the socket is shunted. If there is no continuity between the contacts, then the socket is non-shunted.
Shunted
Contacts within shunted sockets connect straight into the socket, allowing the power to move from one contact to the other. Shunts can be internal and therefore, invisible. Shunted lamp holders are equipped with 2 holes on the unit. Always use shunted lamp holders for instant start ballasts.
Non-Shunted
Non-shunted lamp holders are equipped with 4 holes on the unit. These need to be used with Rapid start ballasts.
Conversion
To convert a non-shunted lamp holder to a shunted lamp holder, take a short wire and strip both ends. Then, take one end of the wire, inserting it into one of the holes on the left side of the lamp holder. Take the other end and insert it into the right side of the unit. This results in creating a shunted lamp holder, because there is a jump from one side to the other.
Be careful about retrofitting fixtures with poorly manufactured, cheaper LED tubes, as this can cause safety hazards, as well as be in conflict with current electrical and safety compliance codes. Always read the installation manual before attempting to do any work yourself. If you are unsure of how to install T-8 sockets, accessories or LED tubes, call a qualified and licensed electrician to help you. It may cost you a few extra dollars, but it will give you peace of mind in knowing you and your family is safe from any fire hazards.
