Licensed Electrical Contractor Wiring Methods and Materials 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

Two 90-degree bends

Answer

Three 90-degree bends

Answer

Five 90-degree bends

Question 2

Which wiring method is permitted for use in a Class I, Division 1 hazardous location?

Accepted Answer

Rigid metal conduit (RMC)

Answer

Type NM cable

Answer

Type AC cable

Answer

Electrical metallic tubing (EMT)

Question 3

When installing Type UF cable underground, what is the minimum burial depth required for a residential branch circuit rated at 120 volts?

Accepted Answer

18 inches

Answer

6 inches

Answer

12 inches

Answer

24 inches

Question 4

Electrical metallic tubing (EMT) is NOT permitted to be used in which of the following locations?

Accepted Answer

Concrete encasement in wet locations

Answer

Dry locations exposed to view

Answer

Concealed in walls of commercial buildings

Answer

Supported on open cable trays

Question 5

What is the minimum size of equipment grounding conductor required for a circuit protected by a 60-ampere overcurrent device using copper conductors?

Accepted Answer

10 AWG

Answer

14 AWG

Answer

12 AWG

Answer

8 AWG

Question 6

Type MC cable installed in a cable tray must be secured at intervals not exceeding how many feet?

Accepted Answer

6 feet

Answer

3 feet

Answer

4 feet

Answer

8 feet

Question 7

Which of the following conductors is approved for direct burial without conduit?

Accepted Answer

Type UF

Answer

Type THHN

Answer

Type XHHW

Answer

Type TW