Homeland Security and Emergency Services

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Terms to Know

  • Transfer Switch: An electrical switch that switches a load between two sources; some transfer switches are manual (operator effects transfer by throwing switch) while others are automatic and trigger when they sense one of the sources has lost or gained power.

  • Ground Fault Circuit Interrupter (GFCI): A safety device on electrical outlets to shut off electricity if the outlet becomes ungrounded, which would create an unsafe condition and could produce an electrical shock.

  • Carbon Monoxide (CO): A poisonous gas that is formed when carbon is not burned completely, especially when gasoline is burned in engines, e.g., automobiles and generators.