Oh puhhhleeeze,
YEARS before they made circuit tracers, EVERY electrician carried one of these.

Ya GOTTA take the time to wrap that sucker in tape just in case [Linked Image]

One building I worked in, and enterprising building engineer had used a normal 120v outlet to feed some 277 volt convection units, then they took those out... I'm trying to find the circuit [Linked Image] It was the only time I actually saw the tape "bulge".... got hot too!!!!

When circuit tracers did come out, they were in the $6-700 neighborhood, most companies said the old "We've been getting by without those for years", so I had to go to work for myself to obtain my first one, haven't used a blow switch since..... well, not intentionally anyway.

What would they have done to this poor guy if he had shorted it by accident? Instead of firing the guy, they MAY wanna take a look at their coordination study, but I guess "Hey, it's been working fine for YEARS"