What is an electrical tombstone?

What is an electrical tombstone?

Tombstones, also sometimes called sockets, are small internal components of a fluorescent or LED fixture. They are responsible for connecting the electrical wires from one end of the fixture to the other and receiving the current of electricity which powers the lamp into creating illumination.

What is a shunted tombstone?

T12 tubes are 1.5 in diameter while T8s are just one inch. All other thingssocket sizes, lengths, distance between pinsare the same. T8 LED tubes won’t fall out if you try to install them in a T12 fixturethey’ll fit just fine.

Are T12 and T8 tombstones the same?

As you can see above, shunted sockets receive voltage through a single set of wires and spread it to two contacts.Non-shunted sockets send voltage to each of the contacts, through two wiring tracks

Do I need shunted or non-shunted sockets?

As you can see above, shunted sockets receive voltage through a single set of wires and spread it to two contacts.Non-shunted sockets send voltage to each of the contacts, through two wiring tracks

How do you wire a tombstone?

If your existing light fixture shows positive continuity when testing both contacts on a single socket (usually the meter will beep), there is power flowing between the two contacts, and this is a shunted tombstone. If there is no power between contacts, it is a non-shunted tombstone.

How can you tell if a tombstone is shunted?

Non-Shunted Rapid Start Tombstones like this are needed. T8 fixtures must have the input side sockets changed to T12 sockets of the Non-Shunted Rapid Start type, as T8 sockets have a circular conductor that will not allow them to properly separate the line and the neutral sides of the circuit.

Are T12 and T8 interchangeable?

In terms of physical compatibility, both T8 and T12 lamps use the same G13 bi-pin base, so as long as they are the same length (e.g. 4-ft), a T8 lamp will physically fit inside a T12 fixture.

What happens if I put a T12 bulb in a T8 fixture?

If you place T12 tubes in a fixture with a T8 ballast, you will wear out the ballast and have to replace it. If you place T8 tubes in a fixture with a T12 ballast, then the tubes will have a shorter life due to a higher current through the tube.

Will T8 work with T12 ballast?

Senior Member. If you run a t8 bulb on a t12 ballast you will have premature bulb life as the t12 ballast will over tax the bulb. If you run it vice versa and have a t8 ballast running a t12 bulb you will have premature ballast life as the t12 bulb takes more to run and will over work the ballast.

Do I need shunted or non shunted?

For example, there are T8 plug-and-play LEDs made to work with rapid-start ballasts and programmed-start ballasts, requiring non-shunted sockets.

Do I need shunted or non shunted for T8 LED?

If your existing light fixture shows positive continuity when testing both contacts on a single socket (usually the meter will beep), there is power flowing between the two contacts, and this is a shunted tombstone. If there is no power between contacts, it is a non-shunted tombstone.

Do I have shunted or non shunted tombstones?

The difference between a shunted and non-shunted socket is how the electrical current flows through the fixture. Current flows through a shunted socket through a single path and through a non-shunted socket through multiple paths.

How do you wire a shunted tombstone?

Tombstones, also sometimes called sockets, are small internal components of a fluorescent or LED fixture. They are responsible for connecting the electrical wires from one end of the fixture to the other and receiving the current of electricity which powers the lamp into creating illumination.

How do you test for tombstones?

As you can see above, shunted sockets receive voltage through a single set of wires and spread it to two contacts.Non-shunted sockets send voltage to each of the contacts, through two wiring tracks

What is the difference between shunted and non shunted?

Non-Shunted Rapid Start Tombstones like this are needed. T8 fixtures must have the input side sockets changed to T12 sockets of the Non-Shunted Rapid Start type, as T8 sockets have a circular conductor that will not allow them to properly separate the line and the neutral sides of the circuit.

Are T8 tombstones shunted?

This is because T12 fixtures have non-shunted tombstones, exactly what you need for LED tubes. T8 fixtures have shunted tombstones, and those tombstones need to be replaced as part of the conversion to LED.

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