It's a bit disingenuous to suggest that accidents like this don't also happen in the U.S. (or other "first-world" countries). In the mid-to-late '90s I was working on a project that had a fatal accident in the Omaha NE area (fortunately I wasn't present to witness it). Another contractor was lacing new fiber-optic cable to the existing coaxial cable and realized they'd run the fiber over a safety ground about 7 poles…
> They knew there was a slight risk the ground wire would be hot once disconnected Is there some way you could measure that before touching it or messing with it? And then call in the power company if its properties are not what they are expected to be?
The current can be measured by measuring the field around the wire. There are many manufacturers of clip on ammeters which make a loop around the wire and then measure The current or potential induced in the loop by the field resulting from the current in the ground wire.
That video was truly horrible. Was that metal scaffolding? I am surprised that fault carried on for 3 Minutes. A fuse should have blown or other protection operated.
Maybe if it was wooden scaffolding it was a high impedance fault undiscernable from high loads.