NEC Code Quiz: Wiring and Installation

Which of the following wiring methods is suitable for use in wet locations according to the NEC code?

• Nonmetallic-sheathed cable (NM)

• Rigid metal conduit (RMC)

• Armored cable (AC)

• Electrical metallic tubing (EMT)

When determining the conductor size for a branch circuit, which factor is most important to consider according to the NEC?

• The color of the insulation

• The length of the conductor

• The current-carrying capacity (ampacity)

• The type of load connected

According to the NEC, what is the minimum clearance required in front of a panelboard for safe operation and maintenance?

• 1 foot

• 3 feet

• 5 feet

• 7 feet

Which of the following is a requirement for installing conductors in a raceway according to the NEC?

• Conductors must be of the same color

• Conductors must be of the same material

• Conductors must be derated if more than three are in a raceway

• Conductors must be installed without any splices

What is the primary purpose of using a panelboard in an electrical installation?

• To increase the voltage of the circuit

• To provide a central point for circuit protection and distribution

• To reduce the current in the circuit

• To serve as a backup power source

In the NEC, which table would you refer to for determining the ampacity of conductors?

• Table 310.15(B)(16)

• Table 250.66

• Table 430.52

• Table 220.55

Which of the following is a correct statement about the installation of panelboards according to the NEC?

• Panelboards can be installed in bathrooms

• Panelboards must be installed in a vertical position

• Panelboards can be installed in closets used for storage

• Panelboards must be installed at least 6 feet above the floor

What is the maximum number of conductors allowed in a conduit according to the NEC, assuming no derating is required?

• 3 conductors

• 4 conductors

• 5 conductors

• 6 conductors

According to the NEC, what is the minimum size of a copper conductor that can be used for a 20-amp branch circuit?

• 10 AWG

• 12 AWG

• 14 AWG

• 16 AWG

Which of the following is a requirement for grounding a panelboard according to the NEC?

• The grounding conductor must be the same size as the largest ungrounded conductor

• The grounding conductor must be connected to a separate grounding electrode

• The grounding conductor must be bonded to the neutral bus

• The grounding conductor must be insulated