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1. If seven No. 10 AWG current-carrying conductors are installed in a raceway where the ambient temperature is 70°F, the allowable ampacity must be ________.

increased by 15%

reduced to 80% of its value

reduced to 60% of its value

increased by 20%

Question 1 of 20

2. Correction factors for reductions due to high ambient temperatures are found in ________.

NEC Chapter 9, Table 8

NEC Article 210.21

NEC Chapter 9, Table 1

NEC Tables 310.15(B)(2)(a)

Question 2 of 20

3. Which of the following is the least flexible form of a conductor?

Solid wire

Coated wire

Compacted wire

Stranded wire

Question 3 of 20

4. What color is reserved for identifying the high leg of three-phase, four-wire system?

Green

Orange

Grey

White

Question 4 of 20

5. The diameter (in inches. of a conductor with a diameter of 40 mils is ________.

0.04"

0.06"

0.02"

0.05"

Question 5 of 20

6. An acceptable method of identifying grounded conductors larger than No. 6 AWG is by tagging them or marking them ________.

black

green

blue

white

Question 6 of 20

7. The normal location to provide overcurrent protection in an electrical circuit is ________.

at the outlet

where the conductor receives its supply

at the last point in the circuit

where the conductor terminates

Question 7 of 20

8. To keep the voltage drop of a 277V circuit to a maximum of 3%, what would be the maximum allowable voltage drop?

5.3V

9.2V

7.5V

8.3V

Question 8 of 20

9. The square mil area of a conductor that is 0.250" on all sides is ________.

80,200 mils2

75,600 mils2

62,500 mils2

55,000 mils2

Question 9 of 20

10. What is the total resistance of a two-wire circuit that spans a distance of 200' each way if the resistance per 1,000' is 1.21V?

0.310V

0.484V

0.245V

0.266V

Question 10 of 20

11. How much of a correction factor is needed if the ambient temperature is 40°C?

0.28

0.77

0.57

0.82

Question 11 of 20

12. What is the total resistance of a two-wire circuit that spans a total distance of 1,650' each way if the conductor resistance is 0.148V per 1,000'?

0.4884V

0.5342V

0.8764V

0.3662V

Question 12 of 20

13. The physical properties of a No. 4/0 copper conductor would be found in ________.

NEC Table 310.15(B)(16)

NEC Chapter 9, Table 1

NEC Chapter 9, Table 8

NEC Table 310.15(B.(7)

Question 13 of 20

14. The recommended maximum voltage drop for conductors, feeders, and branch circuits combined is ________.

9%

5%

7%

3%

Question 14 of 20

15. A correction factor must be applied if the ambient temperature is above ________.

80°F

36°F

30°F

86°F

Question 15 of 20

16. To keep the voltage drop of a 120V circuit to a maximum of 3%, the maximum voltage drop allowed would be ________.

6.6V

7.5V

3.6V

2.6V

Question 16 of 20

17. Which of the following refers to the relative hardness of a conductor?

Stranding

Temper

Reactance

Amperage

Question 17 of 20

18. The most common conductors used for light and power installations range from ________.

4/0 to No. 14 AWG

2/0 to No. 12 AWG

1/0 to No. 11 AWG

No.16 AWG to No. 18 AWG

Question 18 of 20

19. Which of the following must be considered when determining the size of the conductor required to connect an electrical load to the source of supply?

Type of conductor insulation

Frequency of load operation

Permissible voltage drop

Number of strands

Question 19 of 20

20. Recommended maximum voltage drops are located in ________.

NEC Section 210.19(A)(1)

NEC Article 210.10

NEC Section 240.21(B)(2)

NEC Article 100

Question 20 of 20

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