Licensed Electrical Contractor Licensed Electrical Contractor NEC General Requirements Questions and Answers 2 — Questions and Answers
Question 1: According to NEC Article 110, what is the minimum headroom required for working spaces about service equipment rated 600 volts or less?
- 6 feet
- 6 feet 6 inches (Correct answer)
- 7 feet
- 6 feet 3 inches
Correct answer: 6 feet 6 inches
NEC 110.26(A)(3) requires a minimum headroom of 6 feet 6 inches for working spaces about electrical equipment rated 600 volts or less.
Question 2: What does NEC 110.14(A) require regarding the connection of dissimilar metals such as copper and aluminum conductors?
- They must be joined with solder only
- They must be identified for the purpose and conditions of use (Correct answer)
- They can be connected using any listed connector
- They must always use a split-bolt connector
Correct answer: They must be identified for the purpose and conditions of use
NEC 110.14(A) requires that connectors and terminals used with dissimilar metals be identified for the purpose and conditions of use to prevent galvanic corrosion.
Question 3: Per NEC 110.26(A)(1), what is the minimum depth of clear working space in front of electrical equipment operating at 120 volts to ground with exposed live parts on one side and no live or grounded parts on the other?
- 2 feet 6 inches
- 3 feet (Correct answer)
- 3 feet 6 inches
- 4 feet
Correct answer: 3 feet
NEC Table 110.26(A)(1) Condition 1 requires a minimum of 3 feet of clear working space for equipment rated 120 volts to ground.
Question 4: What temperature rating must be used for ampacity selection when conductor terminations are not marked with a temperature rating, per NEC 110.14(C)?
- 60 degrees Celsius for circuits 100 amps or less (Correct answer)
- 75 degrees Celsius for all circuits
- 90 degrees Celsius for all circuits
- 60 degrees Celsius for all circuits
Correct answer: 60 degrees Celsius for circuits 100 amps or less
NEC 110.14(C)(1)(a) requires the use of 60 degrees Celsius ampacity for terminations of circuits rated 100 amps or less when no temperature marking is present.
Question 5: According to NEC 110.12, electrical equipment must be installed in what manner?
- In a manner approved by the local inspector only
- In a neat and workmanlike manner (Correct answer)
- In accordance with manufacturer instructions only
- In a manner consistent with industry practice
Correct answer: In a neat and workmanlike manner
NEC 110.12 requires that electrical equipment be installed in a neat and workmanlike manner to ensure safety and proper function.
Question 6: Per NEC 110.26(C)(1), for equipment rated 1200 amps or more and over 6 feet wide, how many entrances to the required working space are needed?
- One entrance is sufficient
- Two entrances, one at each end of the working space (Correct answer)
- Three entrances minimum
- Two entrances on the same side
Correct answer: Two entrances, one at each end of the working space
NEC 110.26(C)(1) requires at least two entrances to the working space, one at each end, for equipment rated 1200 amps or more and over 6 feet wide.
Licensed Electrical Contractor Licensed Electrical Contractor NEC General Requirements Questions and Answers 2
According to NEC Article 110, what is the minimum headroom required for working spaces about service equipment rated 600 volts or less?