Shunted & Unshunted Tombstone Question


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Old 03-01-19, 11:11 AM
J
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Shunted & Unshunted Tombstone Question

Hi Everyone,

Edit: Sorry I screwed up the title, I meant to write "Tombstones"

Anyway, I was testing the tombstones on my florescent light fixtures and I noticed on one tombstone it shows up as shunted but when I test the opposing tombstone on the other end it shows up as non-shunted.

I'm a bit confused, why would one side show up as shunted and the other as unshunted? The multimeter was set to continuity and that's how I was checking.

Any insight would be greatly appreciated.
 

Last edited by pcboss; 03-01-19 at 12:51 PM.
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Old 03-01-19, 11:14 AM
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There should be a wiring diagram on the ballast. Usually there is only one wire at one end. Typically yellow. This is the common and goes to both pins. At the other end will be either two red or two blue wires.
 
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Old 03-01-19, 12:16 PM
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Hi Pete,

Thanks for the quick reply! Makes sense, I was a bit lazy and did not want to take the fixture apart.

Best Regards,
-John
 
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Old 03-01-19, 03:50 PM
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I do have an additional question (don't know if I need to start a new thread). I plan on converting the fluorescent closet light to an LED single end via direct wire.

The question I have is how do I find out if I have a branch circuit or not? From my understanding, tombstones should not be directly connected to a branch circuit.
 
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Old 03-01-19, 05:37 PM
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All the circuits in your house are branch circuits. If you connect per the LED instructions you will be fine.
 
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Old 03-01-19, 05:41 PM
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Use the old ballast wiring inside the fixture as it's approved for use in a fixture.
The two wires from the non shunted socket should reach the white and black incoming wiring.
There is no polarity.
 
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Old 03-02-19, 12:53 AM
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Got it, Thanks for the help guys!
 
 

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