FREE AND STUDY GAMES ABOUT CODEOLOGY 7 EXAM

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FREE AND STUDY GAMES ABOUT CODEOLOGY 7 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -18 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: 1. NEC 240.21, with some exceptions, requires overcurrent protection in each ungrounded conductor to be located where the conductors connect to the load.True False

Answer:

False Question 2: 11. Feeder taps not over 10 feet long are covered by NEC section ? .

• 240.21(A)
• 240.21(B)(1)
• 240.21(C)(3)
• 240.21(C)(6)

Answer:

• 240.21(B)(1)

Question 3: 14. A 25-foot, 4 AWG, 75°C, copper conductor could be tapped from a 3/0 AWG 75°C, copper feeder conductor protected by a 200-ampere OCPD, if the 4 AWG terminates in an 80 A OCPD and the tap conductors are protected from physical damage by being enclosed in an approved raceway.

• Acceptable Correct
• Violation Incorrect

Answer:

Acceptable Question 4: 6. Once a feeder conductor has been tapped with smaller tap conductors serving downstream equipment, it is not permissible to apply a second tap on the first tap. (In essence, do not tap a tap.)

• True
• False

Answer:

True

240.21

Question 5: 16. Which of the following is not a required item for tap conductors over 25 feet long used in a high bay manufacturing building over 35 feet high at the walls?

Answer:

• The tap conductors are sized 8 AWG copper or 2 AWG aluminum or larger.

Question 6: 17. As shown in the figure, a 150-ampere feeder conductor is installed outside the building in a metal wireway. A 60-ampere tap conductor is installed from the metal wireway to a new garage building located 100 feet away from the original building. A 60-ampere fused disconnecting means is provided outside the new garage. The tap conductors are protected from physical damage by a rigid metal conduit.

Answer:

Acceptable

Question 7: 10.The NEC permits a set of conductors feeding a single load, or each set of conductors feeding separate loads, to be connected to a transformer secondary without overcurrent protection at the secondary, as specified in ?

• 230.91
• 240.2 tap conductors definition
• 240.21(C)(1) through (C)(6)
• 450.3 I

Answer:

• 240.21(C)(1) through (C)(6)

Question 8: 7. A 3/0 AWG copper feeder conductor is tapped with 20 feet of 2 AWG conductor.What is the maximum OCPD size allowed at the termination of the tap conductors installed in a fused switch or circuit breaker? (All conductors and terminations are rated 75°C.

Select one:

• 100 A
• 110 A Correct
• 125 A
• 150 A
• 125 A
• 150 A

Answer:

• 110 A Correct

240.21(B) does not allow the use of 240.4(B), known as the round-up rule. The 2 AWG conductor ampacity from Table 310.15(B)(16) is 115 amperes. The standard rating for OCPDs shown in 240.6(A) would therefore require a 110-ampere OCPD to be used.

Question 9: 15. In an industrial installation, three separate 400-ampere bus duct taps, each 40 feet in length, are permitted to be tapped from a 1,200-ampere busway protected by a 1,200-ampere OCPD.

Answer:

Acceptable -368.17(B) Exception Question 10: 8. An existing 50-ampere branch circuit is located in a kitchen for the connection of cooking equipment. A tap conductor is used to supply a new wall-mounted oven and a new counter-mounted cooking unit. The wiring method used between the 50-ampere junction box and the new cooking equipment is Type NM cable. What is the minimum size conductor and maximum conductor length allowed by Code for this installation?

• 12 AWG, 50' Incorrect
• 10 AWG, 50' Incorrect
• 12 AWG, unlimited length, but not longer t

Answer:

• 12 AWG, unlimited length, but not longer than necessary

Note: 240.21(A) references 210.19 and this installation is addressed by 210.19(A)(3) Exception No.

1.

The correct answer is: 12 AWG, unlimited length, but not longer than necessary

Question 11: 19. A service conductor is never a tap conductor.

Answer:

True Question 12: 4 .Tap conductors shall be permitted to be protected against overcurrent in accordance with ? .

• 210.19(A)(4)
• 240.21
• 368.17(B)
• 430.53(D)
• All of the above