Licensed Electrical Contractor Licensed Electrical Contractor NEC General Requirements Questions and Answers 2

Question 1

According to NEC Article 110, what is the minimum headroom required for working spaces about service equipment rated 600 volts or less?

Accepted Answer

6 feet 6 inches

Answer

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?

Accepted Answer

They must be identified for the purpose and conditions of use

Answer

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?

Accepted Answer

3 feet

Answer

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)?

Accepted Answer

60 degrees Celsius for circuits 100 amps or less

Answer

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?

Accepted Answer

In a neat and workmanlike manner

Answer

NEC 110.12 requires that electrical equipment be installed in a neat and workmanlike manner to ensure safety and proper function.

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Licensed Electrical Contractor Licensed Electrical Contractor NEC General Requirements Questions and Answers 2