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Shunted vs. Non-Shunted Sockets

Question:  How do i tell the difference between a shunted and non-shunted socket?

This little diagram tells the whole story and would apply for T8 and T5 sockets….

T5 Ballast types that run on non-shunted sockets are rapid-start, programmed-start, or dimming ballast’s.  The most common ballast for T5 fixtures today is the instant-start ballast, which uses standard shunted sockets.

Benefits of a double-ended lamp is that the harness from one side of the fixture (whether shunted or non-shunted) is line-voltage , and the harness from the other side of the fixture (whether shunted or non-shunted) is the neutral.  Leaving the sockets in place keeps the UL listing of fixture intact.

When working with 10-lamp T5 fixtures, it is suggested that only five of the sockets be wired together in a run. Meaning… two separate bundles attached to line voltage and neutral.

If you have 480v power, it is currently not possible to use either style of T8/T5 lamps as they cannot handle input voltages that high.  Customers must utilize either step-down transformers or look for other alternatives such as new fixtures.

A more detailed approach is in the diagram attached:  Linear Ballast Bypass Rewiring Maxtrix Sheet

If you have further questions on how to safely and effectively upgrade your facility, reach out to one of the LumenSquad Team Members today.