Wiring Methods & Materials Flashcards

What is the minimum radius of a field bend for a 1-inch EMT conduit?

Answer: 5 inches

NEC Chapter 9, Table 2 specifies that a 1-inch EMT requires a minimum bend radius of 5 inches to the inside of the bend.

Which of the following wiring methods is required for service entrance conductors installed underground?

Answer: Any wiring method listed in Article 230

NEC 230.43 lists the permitted wiring methods for service entrance conductors, including various conduit types and cables appropriate for the installation.

Liquidtight flexible nonmetallic conduit (LFNC) installed outdoors must be which of the following?

Answer: Listed for outdoor use

NEC 356.10(5) requires LFNC installed outdoors to be listed for outdoor use to withstand UV exposure and weather conditions.

When installing parallel conductors in separate conduits, what is required regarding conductor arrangement?

Answer: Each conduit must contain all phases, neutral, and EGC

NEC 310.10(H)(1) requires each parallel conduit to contain conductors of all phases, the neutral, and the equipment grounding conductor to prevent inductive heating.

What is the maximum trade size of electrical metallic tubing (EMT) available?

Answer: 4 inches

NEC 358.20(A) states that EMT is available in trade sizes ½ through 4 inches.

When conductors of different systems (e.g., 120V and 277V) are installed in the same raceway, what is required?

Answer: All conductors must be rated for the highest voltage in the raceway

NEC 300.3(C)(1) requires all conductors sharing a raceway to be insulated for the maximum voltage present in the raceway.

What type of support is required for ENT (electrical nonmetallic tubing) installed in a concealed location?

Answer: Supported every 10 feet and within 3 feet of every box

NEC 362.30(A) requires ENT to be securely fastened at intervals not exceeding 10 feet and within 3 feet of every outlet box or termination.