Leakage current is electric current in an unwanted conductive part under normal operating conditions. Leakage current is the current that flows from either AC or DC circuit in equipment to the chassis, or to the ground, and can be either from the input or the output. If the equipment is not properly grounded, the current flow through other paths such as the human body. This may also happen if the ground is inefficient or is interrupted intentionally or unintentionally.