What are the two types of electrical wire installation?

What are the two types of electrical wire installation?

• A. Overhead and Underground
• B. Rigid and Flexible
• C. Surface and Recessed
• D. Open and Closed (Protected)

Answer: (D)

Open versus closed installations describe whether wiring is exposed or protected. Open wiring is visible and often runs in accessible spaces; it’s easier to inspect but more susceptible to physical damage. Closed, or protected wiring, is installed inside conduits, ducts, or walls, shielding the conductors from damage, moisture, and accidental contact. This distinction matters for safety, durability, and code compliance. The other options describe routing, conductor types, or mounting style, but they don’t define the protection level as clearly as open versus closed.

Open versus closed installations describe whether wiring is exposed or protected. Open wiring is visible and often runs in accessible spaces; it’s easier to inspect but more susceptible to physical damage. Closed, or protected wiring, is installed inside conduits, ducts, or walls, shielding the conductors from damage, moisture, and accidental contact. This distinction matters for safety, durability, and code compliance. The other options describe routing, conductor types, or mounting style, but they don’t define the protection level as clearly as open versus closed.