#1
Which wire color is typically used for the neutral wire in electrical wiring?
White
ExplanationNeutral wire color is white to differentiate from hot wires.
#2
What does AWG stand for in relation to electrical wiring?
American Wire Gauge
ExplanationAWG stands for American Wire Gauge, a standard for wire diameter.
#3
What does NM cable stand for in relation to electrical wiring?
Non-Metallic cable
ExplanationNM cable stands for Non-Metallic cable, commonly used in residential wiring.
#4
Which type of electrical cable is commonly used in residential wiring for general-purpose circuits such as lighting and outlets?
Romex cable
ExplanationRomex cable is popular in homes for general electrical circuits.
#5
Which of the following materials is commonly used for underground electrical cables due to its durability and resistance to moisture?
XLPE (Cross-linked Polyethylene)
ExplanationXLPE is preferred for underground wiring due to its durability and moisture resistance.
#6
What is the purpose of a ground wire in an electrical circuit?
To provide a safe path for current in case of a fault
ExplanationGround wire ensures safety by providing a path for fault currents.
#7
What is the purpose of a conduit in electrical wiring?
To protect wires from mechanical damage
ExplanationConduits safeguard wires from physical harm or environmental factors.
#8
Which type of electrical cable is known for its flexibility and is commonly used for temporary wiring applications?
Portable cord
ExplanationPortable cords are flexible and ideal for temporary wiring needs.
#9
In electrical wiring, what does 'ampacity' refer to?
The ability of a conductor to carry current
ExplanationAmpacity signifies the current-carrying capacity of a conductor.
#10
What is the maximum number of current-carrying conductors allowed in a single conduit, according to the National Electrical Code (NEC)?
4
ExplanationNEC limits to 4 conductors per conduit to prevent overheating.
#11
What does THHN stand for in relation to electrical wiring?
Thermoplastic High-Heat-Resistant Nylon-coated
ExplanationTHHN wire has thermoplastic insulation for heat resistance.
#12
Which type of electrical cable is commonly used in applications where fire resistance is crucial, such as fire alarms and emergency lighting circuits?
Fire-resistant cable (FRC)
ExplanationFRC is vital for fire safety in alarm and emergency systems.
#13
Which type of electrical cable is commonly used for industrial applications due to its ability to withstand high temperatures?
THHN cable
ExplanationTHHN cable is suitable for industrial settings due to its heat resistance.
#14
Which type of electrical cable is commonly used for power distribution in large buildings and industrial facilities?
Bus duct
ExplanationBus ducts are used for efficient power distribution in large facilities.