I need a quick help in understanding from you as I'm in the process of assembling a machine for use in the US.
NEMA 5-15 Outlet with 15Amp breaker - OK. NEMA 5-20 Outlet with 20Amp breaker accepts both 15Amp and 20Amp plugs. If now a 5-15 extension cord with multiple outlets is inserted into the 5-20 Outlet, can't the cord be overloaded? Because the breaker rating is too high?
When I mentioned what customers plug in, I had a specific case in mind. Home owner had 3 outlets in a small room and wanted a 4th. Not to worry, they bought a 6', #16 extension cord and stapled it to the wall, and plugged in a floor lamp. Then they wanted a closet light. Not to worry, they bought a 2nd #16 extension cord and plugged it into the first, drilled a hole into the closet and again stapled everything in place. Oops, how to connect the light (pull chain fixture)? They cut the 2nd extension cord and hardwired the fixture, and mounted the fixture directly to an exposed wood beam (who needs a box). They told me "it's only 2 lights so it's not overloaded". I was speechless.
OK, time for a stroll down Memory Lane... Back in time installation of 'outlets' using zip cord, stapled to baseboards and thru walls was common. Matter of fact, Eagle/Leviton made 'devices' for 'surface wiring'.
The device was wired; forget polarity & that 'ground', Screwed to the baseboard, and extended where 'outlets' were wanted. Some installs were 'tapped' off of a duplex, not plugged in.
Light fixtures were installed like Sedesigner1 describes.
This was the closet light in my daughter's new house when I first saw it. The "home inspector" either missed it or thought it was fine. No switch, you just plugged the cord to an extension cord through the wall from the other room, hanging by the door. (yeah I fixed it)