What are Ground Loops?

In this episode, E&S Grounding Solutions President
David Stockin responds to viewers' questions about
the differences between ground “loops” and ground “rings”.
Ground loops are a common term that is often ill defined and even more often used inappropriately.
Typically, ground loops are used to define a process where the return currents (neutral currents) are
allowed to travel back to the source on the normally non-current-carrying exposed conductive parts of a circuit, in violation of NEC 250.6
Objectionable Currents. Objectionable Currents are hazardous to
both persons and equipment and must be removed from any
circuit,
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[@wh2410]

Good video. When I check the ground to neutral connection in very large services (3000 amps), I will sometimes see between 5 and 10 amps. I thought this was normal, but apparently not. I assume these are because someone has grounded the neutral in a panel somewhere inside the building.