NEC Electrical 3

Question 1

What is the maximum spacing between countertop receptacles along a dwelling kitchen counter?

Accepted Answer

48 inches

Answer

NEC 210.52(C) requires receptacles so no point along the counter is more than 24 inches from one, yielding 48-inch maximum spacing.

Question 2

What ampacity does an 8 AWG copper THHN conductor have at 75°C?

Accepted Answer

50 amps

Answer

Per NEC Table 310.16, 8 AWG copper at the 75°C column is rated 50 amps.

Question 3

Which NEC article covers wiring methods for hazardous (classified) locations?

Accepted Answer

Article 500

Answer

NEC Article 500 governs classification and wiring of hazardous (classified) locations.

Question 4

What is the minimum burial depth for a residential 120-volt circuit using direct-buried UF cable with GFCI protection at 20 amps or less?

Accepted Answer

12 inches

Answer

NEC Table 300.5 permits 12 inches of cover for GFCI-protected residential branch circuits of 20 amps or less.

Question 5

A continuous load must be calculated at what percentage of its value for conductor and overcurrent sizing?

Accepted Answer

125%

Answer

NEC 210.20(A) requires sizing at 125% of a continuous load.

NEC Practice Test