System Earthing Arrangement Selection Application Note

This application note explains how to select the appropriate system earthing arrangement (TN, TT, or IT) for LV electrical installations to ensure protection of persons and equipment against insulation faults. It covers the risks of electric shock, fire, and power unavailability, and compares the three standard arrangements defined by IEC 60364 and NF C 15.100 in terms of safety, availability, and electromagnetic disturbance protection.