Hello, came across a strange situation in a commercial building in Massachusetts. In all the electrical panels in the building there's a voltage reading that just should not be there. You have all the 20 amp single pole branch circuits in all the 208/120 volt electrical panels, the wire leaves the breaker enters either MC cable or EMC and either enters a job box and does nothing or goes to cord cap where nothing is plugged into the cord cap. When you turn of the breaker and take a voltage reading from one or all of the three feed phase wires in the panel I get a reading of 80 volts. Just seems completely impossible. Anyone have any ideas?
Mysterious Voltage
- Thread starter Eagle126
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- Location
- Massachusetts
It might be something else but is likely phantom voltage
Read the info in this link https://www.nema.org/Technical/Documents/Bull_88_reaffirmed_12_15_11.pdf
Read the info in this link https://www.nema.org/Technical/Documents/Bull_88_reaffirmed_12_15_11.pdf
peter d
Senior Member
- Location
- New England
I also vote for ghost/phantom voltage. Use a solenoidal or a low impedance digital tester like the Fluke T+Pro and you will likely see that the circuit is dead.
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