Ahhh, an old and forgotten thread! [Linked Image]
Need to get a "Heads-Up" out to u2slow, and find out just a little bit more regarding this scenario; such as:

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[*] What type of Volt Meter was used - Low Z input or Hi Z Input,


[*] Any "Free-Wheeling" Motors running during the Voltage testing - i.e. Induction Motor(s) running with no loads connected to shaft,


[*] Are both Services fed from the same Transformer Bank - as in a 4 wire Delta, or is there a 3 wire Delta and a separate 1Ø 3 wire Transformer,


[*] Any Incandescent Lamps in the location "Burning Bright" or failing rapidly,


[*] Any Resistance Heating Equipment, which runs exceptionally hot,


[*] Any way to connect the 2nd tester lead to a "known to be solidly bonded" item, or maybe the Grounded Conductor side of a nearby 125 VAC Receptacle,


[*] Can you place a moderate load - say possibly 10-15 amp load, on the Circuit at the test point, then check Voltage,


[*] If using a Hi Input Impedance Meter (Hi Z Input) - such as a DVM with a very low AC Voltage range - have you shunted the meter with a lower Impedance item (like a "Wiggy" in Parallel).
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Per "A", Would like to know what type of Meter is being used, which may / may not be of any influence. Also, is there any "Highest / Peak" switch on the Meter?

Per "B", Unloaded Induction Motors on the same Circuit(s) or Line(s) may have caused a higher Voltage reading at one point, and maybe by the time the Voltage was tested again (at the Panel), the Motor(s) were loaded up or turned off.

Per "C", maybe if there are two separate Transformer banks feeding the dual services, somehow something got mixed up???

Per "D", looking for an overall Voltage increase... as would be explained by Incandescent Lamps which are "Brighter Than Really Should Be", or "Full-Time Job Replacing Lamps".
Similar in respect for item "E", except the Heating Elements really kick Butt!

As to "F", could "The Other" lead of the Tester be connected to something known to be Ground Bonded - or the "Larger" tab side of a nearby 125 VAC Receptacle?

"G" would see what effects placing a load on the circuit would have on the Voltage - at that point (the 6-50R Receptacle).

And for "H", try testing Voltage with both a "Wiggy" and your Meter at the same time, then see if any difference in Voltage readings. Alternative to the "Wiggy" might be an Incandescent Lamp (something safe please!!!).

Will check back later for replies.

Scott35

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!