Last Friday I parked the Volt in my carport and plugged it into the same 120v outlet that I have been using for the last month. An hour later the house experienced a power surge. Seeing that a pair of (ganged) 70 amp circuit breakers that feed the sub panel in the carport had tripped, I went to the carport. There I smelled smoke and saw that a slot, 1 1/2" long and 1/4" wide, had been burned through the steel faceplate of the sub panel.
When the responding fire fighters removed that faceplate we saw that a feed wire had partially melted its insulation and had completely burned through under the slot.
My electrician replaced the burned out feed wire (black, No. 6 size) and determined that the failed wire had been
supplying not only the Volt's outlet, but two air conditioning units, resulting in an imbalance, such that the black side of the circuit was carrying almost 20 amps more current than the red side. The Volt's outlet has now been re-wired to the red side and I have used it for an uneventful charge cycle.
I certainly do not blame the Volt in any way, as it was simply the (big) straw that broke the back of the electical system. Clearly I had too much on one circuit. No one, so far, has been able to tell me why the feed wire burn through occured prior to the circuit breakers opening.
I plan to have an independent electrician review all circuit loads and I offer this only as a cautionary tale to other Volt owners and welcome feedback from this group.