Haven't noticed but when I worked at the electrical substations welding aluminum bus piping up near Bonnieville Dam we had dangling straps on all rigs otherwise the "induced" (what we call static) electricity would knock your socks off.
The substation was not live but the overhead wires were carrying 800,000+ volts. I was unfortunate in picking up a shovel by the metal end that had been laying on the ground for week.
I would imagine that it was also a precautionary measure as not to ignite the gasoline tanks.
QCRobert