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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 20%

reduced to 60% of its value

reduced to 80% of its value

increased by 15%

Question 1 of 20

2. 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?

Number of strands

Frequency of load operation

Permissible voltage drop

Type of conductor insulation

Question 2 of 20

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

0.06"

0.02"

0.05"

0.04"

Question 3 of 20

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

Green

White

Grey

Orange

Question 4 of 20

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

Temper

Reactance

Stranding

Amperage

Question 5 of 20

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

75,600 mils2

62,500 mils2

80,200 mils2

55,000 mils2

Question 6 of 20

7. 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?

0.245V

0.266V

0.484V

0.310V

Question 7 of 20

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

black

green

blue

white

Question 8 of 20

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

NEC Table 310.15(B.(7)

NEC Chapter 9, Table 8

NEC Chapter 9, Table 1

NEC Table 310.15(B)(16)

Question 9 of 20

10. Recommended maximum voltage drops are located in ________.

NEC Article 100

NEC Section 240.21(B)(2)

NEC Article 210.10

NEC Section 210.19(A)(1)

Question 10 of 20

11. 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

0.3662V

0.8764V

0.5342V

Question 11 of 20

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

7.5V

6.6V

3.6V

2.6V

Question 12 of 20

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

Solid wire

Compacted wire

Stranded wire

Coated wire

Question 13 of 20

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

NEC Chapter 9, Table 1

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

NEC Chapter 9, Table 8

NEC Article 210.21

Question 14 of 20

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

4/0 to No. 14 AWG

1/0 to No. 11 AWG

No.16 AWG to No. 18 AWG

2/0 to No. 12 AWG

Question 15 of 20

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

80°F

30°F

86°F

36°F

Question 16 of 20

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

7%

5%

9%

3%

Question 17 of 20

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

at the last point in the circuit

where the conductor receives its supply

at the outlet

where the conductor terminates

Question 18 of 20

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

5.3V

7.5V

8.3V

9.2V

Question 19 of 20

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

0.57

0.28

0.77

0.82

Question 20 of 20

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