This guy could have gone outside and measured. I would have.
Twice. 3 times after seeing how close the HV was.
I always cringe when driving a ground rod, cutting in a box from the outside or when drilling across a stud in a finished wall. You never know what's on the other side of the stud or in the ground. I even cut through a cable in my own house when cutting in a box for a receptacle!
Cringe?-----I sweat and tremble!
How about drilling the top plate from the attic wondering just how (40 or 50 years ago) the original EC ran the cable. Did he drill on one side of the bay and, as close as possible to the top plate, cross the bay and staple?
I've drilled two holes through the top plate, one for the flashlight and one for my eye, and, after the dust had settled, saw that the EC of old had stapled his cable right along the horizontal block that I had planned to drill through next. (using several bit extensions)
And then there's the fun of adding an expandable fan brace kit between floors or in otherwise inaccessible locations.
This has me jamming my arm into the hole as far as I can trying to scrape the trusses (joists) as best I can with a long screwdriver feeling for cables, pipes, anything.