Licensed Electrical Contractor Electrical Contractor Electrical Codes & Standards 2

Question 1

Under the NEC, what is the maximum voltage allowed for a Class 2 circuit?

Accepted Answer

150 volts

Answer

NEC Article 725 permits Class 2 circuits to operate at a maximum of 150 volts.

Question 2

According to NFPA 70, what is the minimum working space depth required in front of electrical equipment rated 600 volts or less with exposed live parts on one side?

Accepted Answer

3 feet

Answer

NEC Section 110.26(A)(1) Condition 1 requires a minimum of 3 feet of clear working space.

Question 3

What NEC article specifically covers the installation requirements for swimming pool electrical equipment?

Accepted Answer

Article 680

Answer

NEC Article 680 covers electrical installations for swimming pools, fountains, and similar installations.

Question 4

Per the NEC, what color must the grounded conductor (neutral) insulation be for sizes 6 AWG or smaller?

Accepted Answer

White or gray

Answer

NEC Section 200.6 requires grounded conductors 6 AWG or smaller to have white or gray insulation.

Question 5

Which NFPA standard is commonly known as the National Electrical Safety Code (NESC) and covers utility installations?

Accepted Answer

NFPA 70 does not cover utilities; the NESC is IEEE C2

Answer

The NESC is published as IEEE C2 and is separate from NFPA 70, which is the NEC for premises wiring.

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Licensed Electrical Contractor Electrical Contractor Electrical Codes & Standards 2