> It gets worse the further from the power tools section you get, I find. I had to explain the difference between a three-prong and four-prong 240V plug once at HD and promptly told my friend to stop asking the staff for "help" finding things.

The best feature of Home Depot is order pickup. No need to explain to someone that some appliances use both 120V for control power and 240V power for the motor or heating element; or that you’re installing a receptacle to backfeed a 120/240V panel with a 120/240V generator and therefore you need a 4-wire NEMA 14 series receptacle with a neutral conductor, you just buy one and pick it up from a locker. It’s made buying things from Home Depot tolerable for me, I’m used to buying material from supply houses where the folks are knowledgeable, I know that’s not the case at HD so I don’t even bother asking.