Plug-In Electric Vehicle Charger Validation and Test Device

An apparatus for performing a ground fault test of a device that delivers power to a load via one or more power lines, the apparatus comprising:

• a first controllable current generator connect to generate a first ground fault current between ground and a first power line of the one or more power lines;
• and
• a controller coupled to the first controllable current generator, the controller configured to perform actions including:
• selecting a current level from a plurality of current levels that differ from one another,
• controlling the first controllable current generator to generate a ground fault current at the selected current level until a ground fault interrupter within the device trips in response to the ground fault current, or until expiration of an on-time interval associated with the selected current level, whichever occurs first,
• after controlling the first controllable current generator to generate a ground fault current at the selected current level, controlling the first controllable current generator to set the ground fault current to zero for an off-time interval associated with the selected current level, and
• repeating the selecting and controlling actions for each of the plurality of current levels, wherein
• when the ground fault interrupter within the device trips, the actions performed further include reporting the selected current level at which the ground fault interrupter tripped and a time interval from an onset of the ground fault current at the selected level and a time when the ground fault interrupter tripped.