#1
Which organization develops the National Electrical Code (NEC)?
National Institute of Standards and Technology (NIST)
International Electrotechnical Commission (IEC)
Institute of Electrical and Electronics Engineers (IEEE)
National Fire Protection Association (NFPA)
#2
What is the primary purpose of the NEC?
To provide guidelines for energy efficiency in electrical systems
To ensure electrical safety for people and property
To standardize voltage levels for electrical devices
To regulate electromagnetic interference (EMI)
#3
What does the term 'ground fault' refer to in electrical systems?
An unintentional connection between an electrical conductor and the ground
A protective device used to prevent electrical shocks
A type of short circuit caused by faulty wiring
A method of connecting electrical devices to the earth
#4
Which of the following is an essential component of an electrical grounding system?
Insulation material
Conduit fittings
Grounding electrode
Fuse box
#5
What is the minimum clearance requirement above a roof for electrical service conductors?
12 inches
18 inches
24 inches
36 inches
#6
Which NEC article covers requirements for electrical installations in hazardous locations?
Article 250
Article 300
Article 500
Article 700
#7
What is the maximum number of conductors allowed in a conduit, as per NEC guidelines?
#8
Which of the following is NOT covered by the NEC?
Wiring methods
Electrical equipment installation
Telecommunication systems
Grounding and bonding requirements
#9
What is the purpose of Article 100 in the NEC?
Defines important terms used throughout the code
Provides guidelines for electrical equipment labeling
Specifies requirements for electrical inspections
Establishes penalties for violations of the code
#10
What is the typical voltage threshold for defining 'low voltage' in electrical systems?
Below 50 volts
Below 120 volts
Below 240 volts
Below 480 volts
#11
In the NEC, what is the function of Article 250?
Requirements for overcurrent protection
Rules for grounding and bonding
Specifications for branch circuits
Guidelines for electrical conductors
#12
What is the purpose of an arc fault circuit interrupter (AFCI)?
To protect against overcurrent conditions
To prevent ground faults
To detect and mitigate the risk of electrical arcs
To regulate voltage fluctuations
#13
What is the minimum height requirement for switches and receptacles above the floor according to the NEC?
12 inches
15 inches
18 inches
24 inches
#14
What is the purpose of bonding jumpers in electrical installations?
To connect electrical panels to the utility grid
To connect metal parts to ensure electrical continuity
To regulate voltage levels in electrical circuits
To provide overcurrent protection
#15
Which NEC section covers overcurrent protection?
Article 210
Article 220
Article 240
Article 250
#16
What is the primary purpose of a GFCI (Ground Fault Circuit Interrupter)?
To prevent overcurrent conditions
To protect against electrical fires
To detect ground faults and shut off power
To regulate voltage fluctuations
#17
What is the function of a surge protective device (SPD) in an electrical system?
To regulate voltage fluctuations
To provide overcurrent protection
To protect against transient voltage spikes
To prevent ground faults
#18
What is the primary function of a tamper-resistant receptacle?
To protect against overcurrent conditions
To prevent electrical shock from insertion of foreign objects
To detect and mitigate the risk of electrical arcs
To regulate voltage fluctuations
#19
What is the purpose of a line reactor in an electrical system?
To protect against overcurrent conditions
To regulate voltage fluctuations
To provide overvoltage protection
To mitigate harmonics and improve power quality