Electrician National Electrical Code (NEC) 2

Question 1

Per the NEC, what is the minimum headroom clearance required in front of electrical panels?

Accepted Answer

6 feet

Answer

NEC 110.26 requires a minimum of 6 feet 6 inches headroom, but 6 feet is the minimum working clearance at the panel face.

Question 2

What is the NEC requirement for the minimum working space depth in front of a 120/240V residential panel?

Accepted Answer

30 inches

Answer

NEC 110.26(A)(1) requires a minimum working space of 3 feet (36 inches) in front of electrical equipment up to 150V to ground.

Question 3

Which NEC article covers swimming pools, fountains, and similar installations?

Accepted Answer

Article 680

Answer

NEC Article 680 covers the special electrical requirements for swimming pools, hot tubs, spas, and fountains.

Question 4

According to the NEC, what is the maximum voltage drop allowed for branch circuits serving general lighting and receptacle loads?

Accepted Answer

3%

Answer

The NEC recommends a maximum of 3% voltage drop for branch circuits to ensure adequate power delivery.

Question 5

Under the NEC, AFCI protection is now required in which residential room?

Accepted Answer

Bedroom

Answer

AFCI protection has been required in bedrooms since the 1999 NEC and has since expanded to most living areas.

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