NEC Questions Practice Test-4
Quiz-summary
0 of 10 questions completed
Questions:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
Information
Free NEC code Questions Practice test-4
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 10 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- Answered
- Review
-
Question 1 of 10
1. Question
What is ampacity of 1/0 THWN conductor in a dry location at an ambient temperature of 1040 F if the raceway contains four 1/0 THWN conductors?
Correct
Incorrect
The conductor ampacity of 1/0 THWN in dry location ( 900C) = 170 amperes ( NEC Table 310.15(B)(16))
Ambient temperature correction factor at 1080F = 0.91 ( NEC Table 310.15(B)(2))
Raceway conductor bundle adjustment factor for 4 conductors = 0.8 ( NEC Table 310.15(B)(3)(a))
corrected ampacity = 170 * 0.8*0.91 = 124 amperes
-
Question 2 of 10
2. Question
What size conductor are required for a single family dwelling unit with a calculated load of 220 Amperes and the maximum unbalanced neutral load is 110 amperes?
Correct
Incorrect
NEC Table 310.15(B)(7)
Service conductor for 225 Amperes load = 3/0 AWG
neutral conductor for unbalanced load 110 = 3 AWG -
Question 3 of 10
3. Question
What is the minimum size of copper conductor used for surge protective devices?
Correct
Incorrect
Refer: NEC 285.26
-
Question 4 of 10
4. Question
If storage batteries are used as emergency power systems. what is the minimum time that they should supply emergency loads?
Correct
Incorrect
Refer: NEC 700.12
-
Question 5 of 10
5. Question
In a wet location, the enclosure shall be mounted that there is at least ………………. airspace between enclosure and the wall.
Correct
Incorrect
Refer: NEC 312.2
-
Question 6 of 10
6. Question
The low voltage lighting system transformer has a power rating of 300 watts at 15 volts. How many 25 watts lams can be connected in the lighting system?
Correct
Incorrect
Number of lamps = 300/25 = 12
-
Question 7 of 10
7. Question
The building entry points of underground ducts or conduits must be sealed.
Correct
Incorrect
Refer : NEC 230.8
These must be sealed to prevent the entry of gases or moisture in to the building.
-
Question 8 of 10
8. Question
What is the demand factor in percentage for a non-dwelling unit with a receptacle load of 15 kVA?
Correct
Incorrect
Refer: NEC Table 220.44
-
Question 9 of 10
9. Question
The computed branch circuit load should not be less than which of the following percentage of continuous load in the circuit?
Correct
Incorrect
-
Question 10 of 10
10. Question
Receptacles installed on 20 ampere branch circuit shall not be of grounding type.
Correct
Incorrect