We were recently notified that a receptacle that had been installed in a storage room by one of our electricians could have been the cause of a small fire. The receptacle was a dedicated 20 A 120V circuit located 5' from a 120/240 v SP loadcenter. There were no staples (fished in) and no other junctions. We do not stab any devices, so the wires were tightly secured under the screws. We did learn that the GC and other subs were using this recept occasionally for trim out tasks, however the GC was adamant that nothing was left plugged in to the receptacle on the night of the fire. The receptacle had been installed and used periodically for over a month. The fire started at approx 2 AM. I spoke with the fire investigator and he basically stated that the only thing in the area of the origin of the fire (as they determined) was this receptacle. The strangest thing about this entire story was three or four different residents in the subdivision called in to the Utility Company complaining about there lights flickering around 8-9 PM that night prior to the fire. Any ideas?