Tesla Motors recently updated Model S software to automatically reduce the current the vehicle draws from power outlets if there appears to be a wiring fault, since some wiring faults can cause fires.
The update comes after a fire incident happened in Irvine, CA back in November. The fire investigators determined that the fire was caused by a wall-charging system that overheated and not by the luxury sedan itself.
If the Model S onboard charging system detects unexpected fluctuations in the input power to the vehicle, it will automatically reduce the charging current by 25%. For example, this will reduce a 40 amp charge rate to 30 amps.
According to Tesla, the software update is designed to help protect you even when a problem exists that is outside of the car or charging electronics.
It should significantly increase robustness and safety in the unlikely situation that a home wiring system, receptacle, adapter or cord is unable to meet its rated current capacity.