Red Seal Electrician Practice
Safety and work practicesQuestion 669 of 1506

What is the main advantage of a GFCI over relying on the design of each appliance?

  1. It prevents all short circuits in the appliance from happening.
  2. It removes the need for any insulation on the power cord.
  3. It raises the supply voltage to the appliance when needed.
  4. It protects the user whatever the appliance design is.
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Correct answer: It protects the user whatever the appliance design is.

A GFCI works from the supply side, so it helps whatever the appliance design. A grounded or double-insulated appliance on top of it is better still.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 3.8: Safe Circuit Design

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Questions last reviewed: 18 October 2026