Solution and Answer Guide
Illustrated Guide to the National
Electrical Code 9th Edition
What is the primary purpose of the National Electrical Code (NEC)?
A) To provide design specifications for electrical equipment
B) To ensure safety in electrical installations
C) To offer guidelines for electrical system performance
D) To standardize the cost of electrical materials
Answer: B) To ensure safety in electrical installations
,Which section of the NEC covers general requirements for wiring methods and
materials?
A) Article 300
B) Article 400
C) Article 500
D) Article 600
Answer: A) Article 300
In the NEC, what does Article 310 pertain to?
A) Conductors for General Wiring
B) Grounding and Bonding
C) Circuit Wiring
D) Safety Procedures
Answer: A) Conductors for General Wiring
Which NEC Article deals with the installation of electrical services?
A) Article 230
B) Article 250
C) Article 300
D) Article 400
Answer: A) Article 230
According to the NEC, what is the minimum working space required in front of an
electrical panel?
A) 24 inches
B) 30 inches
C) 36 inches
D) 48 inches
, Answer: B) 30 inches
What is the primary function of a Ground Fault Circuit Interrupter (GFCI)?
A) To prevent overheating of circuits
B) To protect against electrical fires
C) To interrupt the circuit in the event of a ground fault
D) To ensure proper grounding of electrical devices
Answer: C) To interrupt the circuit in the event of a ground fault
Which of the following is required for wiring in damp or wet locations according to
the NEC?
A) Nonmetallic sheathed cable
B) Conduit or cable with waterproof insulation
C) Metal-clad cable
D) Fiber optic cable
Answer: B) Conduit or cable with waterproof insulation
In residential installations, what is the maximum allowable voltage drop for branch
circuits according to the NEC?
A) 2%
B) 3%
C) 5%
D) 10%
Answer: A) 2%
What does Article 500 of the NEC cover?
A) Hazardous (Classified) Locations
B) Wiring Methods
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