TN LLE Wiring Methods and Installation 2

Question 1

According to NEC 310.10(H), conductors connected in parallel must be what minimum size?

Accepted Answer

1/0 AWG or larger

Answer

6 AWG or larger

Answer

4 AWG or larger

Answer

2 AWG or larger

Question 2

Per NEC Table 310.15(C)(1), when 4 to 6 current-carrying conductors are bundled together in a raceway, the ampacity must be derated to what percentage of the base table value?

Accepted Answer

80%

Answer

50%

Answer

60%

Answer

70%

Question 3

According to NEC 330.30, Type MC cable must be secured at intervals not exceeding:

Accepted Answer

6 feet

Answer

4 feet

Answer

4.5 feet

Answer

8 feet

Question 4

Under NEC 358.30, EMT (Electrical Metallic Tubing) must be secured at intervals not exceeding:

Accepted Answer

10 feet

Answer

6 feet

Answer

8 feet

Answer

12 feet

Question 5

Under NEC 350.60, Flexible Metal Conduit (FMC) is permitted to serve as the sole equipment grounding conductor only if the total ground return path length does not exceed:

Accepted Answer

6 feet

Answer

3 feet

Answer

8 feet

Answer

10 feet

Question 6

Which of the following best describes a permitted use of Liquidtight Flexible Nonmetallic Conduit (LFNC) per NEC Article 356?

Accepted Answer

Lengths up to 6 feet where flexibility or protection from liquids is needed

Answer

Unlimited lengths in exposed outdoor applications

Answer

As a service entrance conduit on building exteriors

Answer

In lengths exceeding 6 feet in concealed ceiling spaces

Question 7

When a conduit exits a concrete floor slab, NEC 300.4(F) requires that conductors be protected from abrasion by:

Accepted Answer

A listed bushing or equivalent protection at the point where the conduit exits

Answer

Using only rigid metal conduit for all floor penetrations

Answer

Extending the conduit at least 12 inches above the finished floor

Answer

Installing a locknut below the floor surface