I hung pendant lights that just plug in with no wiring necessary. One of them blew out after an hour, but it was not the bulb. One of them melted at the wire and came crashing to the ground and shattered in our face! We took the other two down after that. The outlets are up in a little groove in the ceiling which I thought was strange. Were these lights incorrectly installed?
Is it possible that you have low voltage pendants plugged into 20 volts? Other than that it does sound like either they are garbage, or the outlets were installed improperly. Certainly, if they are melting the wire, they should not be used until an answer is found.
Updated on April 10, 2018
By Dan Harmon