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Old 01-21-2015, 10:34 AM   #1
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Reading backfeed voltages

No too long back I brought up reading a backfeed voltage through a residential utility meter. When the meter is set and only one leg is hot to it, you'll read full voltage in the other leg. Generally 1 or 2 volts less.

Here's a picture of a conventional meter back, the coil is connected between legs to generate flux to propel the disc. So, once you hook up one leg, its voltage is induced onto the other. A leg to leg check will read near zero. Also, an electronic meter behaves the same way in regards to backfeed.
Reading backfeed voltages-imageuploadedbytapatalk1421858065.844359.jpg


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Jump-start (01-21-2015)
Old 01-21-2015, 10:39 AM   #2
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Thank you for the post. This is the reason why anyone trouble shooting should check line to line.

Similar that goes along with this is an open leg while the hot water heater is running or electric heat. Anything that's line to line. The live leg will back feed the other leg. If the 240 volt load is large enough it can get 120 volt lights/appliances running.

Can get very confusing not checking between hots.


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