EETC Wiring Methods 2

Question 1

What is the maximum number of 90-degree bends permitted in a single run of rigid metal conduit (RMC) between pull points?

Accepted Answer

Four 90-degree bends

Answer

NEC 358.26 limits the total bends to 360 degrees (equivalent to four 90-degree bends) between pull points in EMT and RMC runs.

Question 2

Which wiring method is specifically listed for use in hazardous (classified) locations Class I, Division 1?

Accepted Answer

Rigid metal conduit (RMC)

Answer

Rigid metal conduit (RMC) is one of the approved wiring methods for Class I, Division 1 hazardous locations per NEC Article 501.

Question 3

When installing PVC conduit underground, what is the minimum cover required for a branch circuit rated 120V or less under a residential driveway?

Accepted Answer

18 inches

Answer

NEC Table 300.5 requires 18 inches of cover for PVC conduit under residential driveways for circuits 120V or less.

Question 4

What is the minimum radius for a field bend in 2-inch RMC?

Accepted Answer

9.5 inches

Answer

NEC Table 344.24 specifies a minimum bend radius of 9.5 inches for 2-inch RMC to prevent conductor damage.

Question 5

Type UF cable differs from Type NM cable primarily because UF cable is:

Accepted Answer

Suitable for direct burial in the earth

Answer

Type UF (Underground Feeder) cable has a moisture-resistant, sunlight-resistant jacket approved for direct burial per NEC 340.10.

(EETC) Electrical Technician Certification Practice Test