1.1 This Standard applies to Class A, single- and three phase, ground-fault circuit interrupters intended for protection of personnel, for use only in grounded neutral systems in accordance with the National Electrical Code (NEC), ANSINFPA 70, the Canadian Electrical Code, C22.1 (CEC)， and Electrical Installations (Use), NOM-001-SEDE. These devices are intended for use on alternating current (AC) circuits of 120 V, 208Y/120 V, 120/240 V, 127 V, or 220Y/127 V, 60 Hz circuits.
