CME NEC Code and Theory 2

Question 1

Under NEC Article 210, what is the maximum distance from a doorway that a receptacle outlet must be placed in a dwelling unit wall space?

Accepted Answer

6 feet

Answer

12 feet

Answer

4 feet

Answer

8 feet

Question 2

What NEC article covers the installation of transformers and transformer vaults?

Accepted Answer

Article 450

Answer

Article 480

Answer

Article 460

Answer

Article 490

Question 3

According to NEC 230.24, service-entrance conductors above a residential roof must maintain a minimum clearance of how many feet when the roof slope is less than 4 inches in 12?

Accepted Answer

3 feet

Answer

8 feet

Answer

10 feet

Answer

18 feet

Question 4

NEC 310.15 addresses conductor ampacity. When more than 3 current-carrying conductors are in a raceway, what correction factor applies at exactly 4-6 conductors?

Accepted Answer

0.80

Answer

0.70

Answer

0.60

Answer

0.50

Question 5

Under NEC 404.2(C), a grounded conductor is NOT permitted to serve as the only means of grounding a metal enclosure for a switch. What does this rule require instead?

Accepted Answer

A separate equipment grounding conductor must be run to the switch enclosure

Answer

A ground fault circuit interrupter must be installed

Answer

The switch must be replaced with a GFCI device

Answer

A bonding jumper must connect neutral to the box

Question 6

According to NEC 700.12, emergency system sources must be capable of supplying power within how many seconds of normal supply failure?

Accepted Answer

10 seconds

Answer

30 seconds

Answer

60 seconds

Answer

5 seconds

Question 7

What is the minimum burial depth for Schedule 80 PVC conduit under a residential driveway per NEC Table 300.5?

Accepted Answer

6 inches

Answer

24 inches

Answer

18 inches

Answer

12 inches