Licensed Electrical Contractor Electrical Codes & Standards 2

Question 1

Under NEC Article 210, what is the minimum number of 20-ampere small-appliance branch circuits required for a kitchen countertop in a dwelling unit?

Accepted Answer

Two 20-ampere circuits

Answer

One 15-ampere circuit

Answer

Three 20-ampere circuits

Answer

One 20-ampere circuit

Question 2

NEC Article 230 governs services. What is the maximum height above grade level for a service entrance conductor attachment point on a building?

Accepted Answer

30 feet

Answer

18 feet

Answer

25 feet

Answer

No maximum specified

Question 3

According to NEC 250.66, the size of the grounding electrode conductor for a copper service entrance conductor of 3/0 AWG is:

Accepted Answer

4 AWG copper

Answer

6 AWG copper

Answer

8 AWG copper

Answer

2 AWG copper

Question 4

What NEC article specifically covers wiring methods and installation of conduit fill calculations?

Accepted Answer

Chapter 9 Tables

Answer

Article 300

Answer

Article 310

Answer

Article 250

Question 5

Under NEC 210.52, GFCI protection is required for all receptacles within how many feet of the outside edge of a bathroom sink?

Accepted Answer

6 feet

Answer

3 feet

Answer

4 feet

Answer

5 feet

Question 6

NEC 404.2(C) requires a grounded conductor (neutral) at switch locations. Which exception allows omission of the neutral at a switch box?

Accepted Answer

When wiring is installed in conduit and a grounded conductor is not needed for switch operation

Answer

When a metal conduit system provides the equipment ground

Answer

When the switch controls a 240V load only

Answer

When the switch is a 3-way type

Question 7

According to NEC 517.13, patient care areas in healthcare facilities require a redundant grounding path. This is accomplished by:

Accepted Answer

Installing an insulated equipment grounding conductor in addition to the metal raceway

Answer

Using double-insulated wiring throughout

Answer

Providing two separate service entrances

Answer

Using GFCI breakers on all circuits