CEA NEC Code and Calculations 3

Question 1

Under the NEC, what is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?

Accepted Answer

6 inches

Answer

NEC Table 300.5 specifies 6 inches minimum cover for RMC under a residential driveway.

Question 2

What does the NEC require regarding GFCI protection for all 125-volt, 15- and 20-ampere receptacles in a bathroom?

Accepted Answer

All bathroom receptacles must be GFCI-protected

Answer

NEC 210.8(A)(1) requires GFCI protection for all 125-volt, 15- and 20-ampere receptacles in bathrooms.

Question 3

A circuit has a resistance of 12 ohms and a voltage of 120 volts. What is the current using Ohm's Law?

Accepted Answer

10 amperes

Answer

Ohm's Law: I = V ÷ R = 120 ÷ 12 = 10 amperes.

Question 4

According to the NEC, what minimum headroom must be maintained in front of electrical equipment rated 600 volts or less?

Accepted Answer

6.5 feet (2.0 m)

Answer

NEC 110.26(A)(3) requires a minimum headroom of 6.5 feet in front of service equipment, panelboards, and similar equipment.

Question 5

Which NEC article covers grounding and bonding requirements?

Accepted Answer

Article 250

Answer

NEC Article 250 covers all grounding and bonding requirements for electrical systems.

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