First time I have ever come across an electrical cable inserted in a hole drilled in bottom of joist. I am sure the “2 inch minimum clearance from edge of joist would apply here”, would just like to verify that. There was no visible exit from joist so who ever drilled the hole must have gone through it completely.
Welll my concern would be as this is a structural support beam in basement that one of the beams has been compromised by drilling a hole from top to bottom. This reduces size of beam and load bearing capacity and also maximum span distance. Beam would be rated at roughly as 3 1/2 joists compared to the 4 joist ( at 1 1/2 inches ) beam it started at.
Well I kind of think you are overthinking it. Can’t really imagine a 1/2 inch hole would, in any way, compromise the beam.
I suspect one of our SEs might offer an opinion. You could PM Randy Mayo he will answer better than me.
Don’t make much sense, but there is no doubt in my mind that little hole is going to affect that 4-ply beam.
As Larry said, protection plates should be added so some idiot decides to finish the basement.