Electrical hazards can be prevented by which of the following?

1. Properly grounding the circuit
2. Using ground fault circuit interrupters (GFCIs)
3. Using only Underwriters Laboratories (UL)–approved electrical equipment
4. Using as many extension cords as necessary to keep the wires out of the way
a. 1 and 2 c. 2 and 3
b. 3 and 4 d. 1, 2, and 3

ANS: D
Grounding provides a path of least resistance that allows current to bypass the body in the event of a short circuit. Ground fault circuit interrupters are circuit breakers that will trip when there is even a small difference between current flowing out through the device and current returning through the device. Underwriters Laboratories certifies devices that are plugged into current sources.