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UL 943C OUTLINE
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UL 943C OUTLINE 2nd Edition, November 2, 2012 OUTLINE OF INVESTIGATION FOR SPECIAL PURPOSE GROUND-FAULT CIRCUIT-INTERRUPTERS
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Description / Abstract:
These requirements cover ground-fault circuit-interrupters
intended for use in one of the following applications:
a) Where the voltage to ground is greater than 150 volts and equipment grounding or double insulation is required by the National Electrical Code, ANSI/NFPA 70,
b) Where the voltage to ground is 150 volts or less and equipment grounding or doubleinsulation is provided, but the use of a Class A ground-fault circuit-interrupter is not practical.
Ground-fault circuit-interrupters addressed by these requirements are divided into three classes, Class C, D and E, 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.
These ground-fault circuit-interrupters are intended to be applied on circuits as shown in Figure 1.1. The requirements for Class A ground-fault circuit-interrupters are in the Standard for Ground-Fault Circuit-Interrupters, UL 943.
a) Where the voltage to ground is greater than 150 volts and equipment grounding or double insulation is required by the National Electrical Code, ANSI/NFPA 70,
b) Where the voltage to ground is 150 volts or less and equipment grounding or doubleinsulation is provided, but the use of a Class A ground-fault circuit-interrupter is not practical.
Ground-fault circuit-interrupters addressed by these requirements are divided into three classes, Class C, D and E, 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.
These ground-fault circuit-interrupters are intended to be applied on circuits as shown in Figure 1.1. The requirements for Class A ground-fault circuit-interrupters are in the Standard for Ground-Fault Circuit-Interrupters, UL 943.