NHIE Electrical Part 2 Test Questions
and Answers Graded A+
What are some traits of aluminum wire? - Answer- Expands more than copper, easier to
nick, must have paste to prevent corrosion, must terminate in aluminum rated fixtures.
Can aluminum 15 and 20 amp circuits be made safe? - Answer- Yes, if properly sized
and terminated with aluminum rated fixtures.
What is reverse polarity? - Answer- Hot and neutral wires reversed.
What is an example of reverse polarity? - Answer- Light goes out but shell is energized.
Is a three-pronged receptacle always grounded? - Answer- No, especially if installed in
a two-wire system.
Is a GFCI safe in lieu of a ground wire? - Answer- Yes, if installed on a two-wire system.
What are some examples of household appliances with three prong outlets? - Answer-
Washing machines, refrigerators, computers, microwaves, waterbed heaters, power
tools.
What does a 240 volt service consist of? - Answer- Three wires: two hot wires and one
neutral.
What determines how much electricity is available to the house? - Answer- Size of the
service entrance cable.
How is service size determined? - Answer- By the smaller of the size of the service wire,
the size of the main panel box, or the size of the main disconnect.
What is the service size if the service wire is rated at 200 amps, the service panel is
rated at 200 amps, and the main disconnect is 100 amps? - Answer- 100 amps.
What is the service size if the main disconnect consists of two 100 amp fuses? -
Answer- 100 amps.
What is a #6 gauge copper wire rated for? - Answer- 60 amps.
What is a #4 gauge copper wire rated for? - Answer- 100 amps.
and Answers Graded A+
What are some traits of aluminum wire? - Answer- Expands more than copper, easier to
nick, must have paste to prevent corrosion, must terminate in aluminum rated fixtures.
Can aluminum 15 and 20 amp circuits be made safe? - Answer- Yes, if properly sized
and terminated with aluminum rated fixtures.
What is reverse polarity? - Answer- Hot and neutral wires reversed.
What is an example of reverse polarity? - Answer- Light goes out but shell is energized.
Is a three-pronged receptacle always grounded? - Answer- No, especially if installed in
a two-wire system.
Is a GFCI safe in lieu of a ground wire? - Answer- Yes, if installed on a two-wire system.
What are some examples of household appliances with three prong outlets? - Answer-
Washing machines, refrigerators, computers, microwaves, waterbed heaters, power
tools.
What does a 240 volt service consist of? - Answer- Three wires: two hot wires and one
neutral.
What determines how much electricity is available to the house? - Answer- Size of the
service entrance cable.
How is service size determined? - Answer- By the smaller of the size of the service wire,
the size of the main panel box, or the size of the main disconnect.
What is the service size if the service wire is rated at 200 amps, the service panel is
rated at 200 amps, and the main disconnect is 100 amps? - Answer- 100 amps.
What is the service size if the main disconnect consists of two 100 amp fuses? -
Answer- 100 amps.
What is a #6 gauge copper wire rated for? - Answer- 60 amps.
What is a #4 gauge copper wire rated for? - Answer- 100 amps.
