CEA Wiring Methods & Installation Practices 2

Question 1

What is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?

Accepted Answer

12 inches

Answer

RMC requires a minimum burial depth of 6 inches under a residential driveway, but 12 inches is the NEC standard for RMC under driveways subject to vehicular traffic.

Question 2

Which wiring method is NOT permitted in a Class I, Division 1 hazardous location?

Accepted Answer

Flexible metal conduit (FMC)

Answer

Standard flexible metal conduit is not permitted in Class I, Division 1 hazardous locations because it cannot maintain an explosion-proof seal.

Question 3

When installing EMT in a concrete slab, which requirement applies?

Accepted Answer

EMT must be coated or corrosion-resistant when encased in concrete

Answer

EMT encased in concrete must be made of steel listed for the purpose or protected by a listed corrosion-resistant coating.

Question 4

What is the maximum number of 90-degree bends allowed between pull points in a conduit run?

Accepted Answer

Four 90-degree bends

Answer

The NEC limits conduit runs to a total of 360 degrees (four 90-degree bends) of bends between pull points to allow wire to be pulled without damage.

Question 5

Type AC cable (armored cable) must be secured within how many inches of every box or fitting?

Accepted Answer

12 inches

Answer

Type AC cable must be secured within 12 inches of every box, cabinet, or fitting and at intervals not exceeding 4.5 feet.

(CEA) Certified Electrical Apprentice Practice Test

(CEA) Certified Electrical Apprentice Practice Test

CEA Wiring Methods & Installation Practices 2