1 Scope

1.1 These requirements cover ground-fault circuit-interrupters intended for use in one of the following applications:

1. a) Where the voltage to ground is greater than 150 volts and equipment grounding or double insulation is required by the NFPA 70^®, National Electrical Code^® (NEC^®);

2. b) Where the voltage to ground is 150 volts or less and equipment grounding or double-insulation is provided, but the use of a Class A ground-fault circuit-interrupter is not practical.

NFPA 70^®, National Electrical Code^®, and NEC^® are registered trademarks of the National Fire Protection Association, Quincy, MA.

1.2 Ground-fault circuit-interrupters addressed by these requirements are divided into specified class designations, Class C, D, E and F, based upon voltage rating and the characteristics of the grounding circuit. Some are intended for use in circuits where grounding is not provided to the load but double-insulation is provided.

1.3 These ground-fault circuit-interrupters are intended to be applied on circuits as shown in . The requirements for Class A ground-fault circuit-interrupters are in Ground-Fault Circuit-Interrupters, UL 943.