Under normal operation, when there is a ground connection, leakage current flows in the chassis or protective earth conductor. If the ground connection is broken for any reason, the leakage current can flow through the body of any person operating the equipment, presenting a potential hazard. IEC 60335-1 recognizes two categories of equipment: portable and stationary. IEC 60950-1 includes three equipment categories, hand-held, movable, and stationary. Portable devices in IEC 60335 are limited to 0.75 milliamperes (mA) of leakage current, the same as hand-held devices in IEC 60950-1. Movable and stationary devices are limited to 3.5 mA of leakage current in IEC 60950-1, the same level stipulated for stationary appliances in IEC 60335-1.