Patent ID: 8717038

Claim:
A wiring testing device configured to test the wiring correctness of an inverter, that serves to convert a direct voltage into a three-phase alternating current, the inverter configured to be connected to a low-voltage three-phase system with a neutral conductor serving as a reference point for grid-side conductor voltages, comprising: a test circuit configured to measure the grid-side conductor voltages and determine an average value from the sum of the instantaneous values of the grid-side conductor voltages; a display unit configured to display an error message if the average value exceeds a threshold voltage for a defined time period; and a capacitor connected between a phase of the three-phase system and the neutral conductor configured to generate a voltage imbalance if the neutral conductor connection is missing, wherein the test circuit is configured to measure the conductor voltages and determine the voltage imbalance, and wherein the display unit is configured to generate an error message if the neutral conductor connection is found missing.