Stray voltage is generally regarded as being below 10 volts as correctly stated by Dave K.
Voltages above 10 volts are generally considered to be fault currents (volts x amps = current) or leakage currents both which should be corrected immediately to prevent death or injury.
The term used in the above answer by Dave K is somewhat misleading in that stray voltage is not the "natural voltage"; it is "manmade voltage" and not natural.
DC voltage may be manmade or naturally occurring.
In a multi-grounded wye distribution, earth is used as a conductor in parallel with the primary neutral.
The intentional grounding of the primary neutral to earth, creates "earth currents", nature did not create them. Man created this condition.
The multi-grounded wye distribution system is the only commonly used distribution system that creates "stray voltage" by design. This is clearly stated in CRN 2002 and NEETRAC 2008. Chuck Untiedt
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