E2 Wiring Methods and Materials 2

Question 1

What is the maximum number of 90-degree bends permitted in a single run of EMT between pull points?

Accepted Answer

Four 90-degree bends

Answer

Two 90-degree bends

Answer

Three 90-degree bends

Answer

Five 90-degree bends

Question 2

Which wiring method is specifically listed for use in concrete encasement?

Accepted Answer

Rigid Metal Conduit (RMC)

Answer

Electrical Metallic Tubing (EMT)

Answer

Intermediate Metal Conduit (IMC)

Answer

Flexible Metal Conduit (FMC)

Question 3

Under NEC Article 330, Metal-Clad (MC) cable installed exposed in a commercial building must be supported at intervals not exceeding:

Accepted Answer

6 feet

Answer

18 inches

Answer

3 feet

Answer

10 feet

Question 4

When installing liquidtight flexible metal conduit (LFMC) in lengths exceeding 6 feet, the installer must:

Accepted Answer

Use a separate equipment grounding conductor inside

Answer

Install expansion fittings every 6 feet

Answer

Increase conduit trade size by one

Answer

Replace with rigid conduit

Question 5

What is the minimum cover requirement for RMC installed directly in a concrete slab on grade?

Accepted Answer

0 inches — no cover required

Answer

1 inch

Answer

2 inches

Answer

3 inches

Question 6

A commercial inspector finds Schedule 40 PVC conduit installed in a machinery area subject to physical damage. This installation is:

Accepted Answer

A code violation — Schedule 80 or RMC required

Answer

Acceptable if conduit is painted

Answer

Acceptable with warning labels

Answer

Acceptable below 6 feet only

Question 7

The NEC requires that all conductors of the same circuit, including the EGC, must be contained within the same raceway primarily to:

Accepted Answer

Prevent inductive heating of metallic raceways

Answer

Simplify color coding

Answer

Reduce voltage drop

Answer

Meet minimum fill requirements