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Codeology 7

Special Conductor Overcurrent Protection Permitted, Including Taps

QuestionAnswer
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 False
2. A conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that is protected as described elsewhere in 240.4 best describes ? a. branch-circuit conductor b. feeder conductor c. service conductor d. tap conductor d. tap conductor 240.2
3. Conductors, other than flexible cords, flexible cables, and fixture wires, are required without exception or other permission to be protected against overcurrent in accordance with their ampacity specified in 310.15 at the source connection point of the conductor. true false False -240.4
4 .Tap conductors shall be permitted to be protected against overcurrent in accordance with ? . a. 210.19(A)(4) b. 240.21 c. 368.17(B) d. 430.53(D) e. All of the above All of the above -240.4(E)
5. Section 240.21 provides specific 10-foot and 25-foot tap rules for service conductors. True False False Note: Service conductors are permitted to be tapped as per 230.46. Always check with the local utility for allowed service conductor tap rules.
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.) a. True b. False True 240.21
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: a. 100 A b. 110 A Correct c. 125 A d. 150 A c. 125 A d. 150 A b. 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.
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? a. 12 AWG, 50' Incorrect b. 10 AWG, 50' Incorrect c. 12 AWG, unlimited length, but not longer t c. 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
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 ? a. 230.91 b. 240.2 tap conductors definition c. 240.21(C)(1) through (C)(6) d. 450.3 I c. 240.21(C)(1) through (C)(6)
11. Feeder taps not over 10 feet long are covered by NEC section ? . a. 240.21(A) b. 240.21(B)(1) c. 240.21(C)(3) d. 240.21(C)(6) b. 240.21(B)(1)
12. Overcurrent protection shall be permitted to be installed as close as practicable to the storage battery terminals in an unclassified location. True b. False True The correct answer is: 240.21(H)
13.a. Field installed tap conductors which leave the enclosure in which the tap was made, the tap conductor’s ampacity is not less than 1/10th of the OCPD ampere rating that is protecting the feeder conductors. Incorrect b. The ampacity of the tap conductor is not less than the ampere rating of the OCPD at the termination of the tap conductor, or is not less than the rating of the equipment containing an overcurrent protective device(s) supplied by the tap conductor. Incorrect c. The ampacity of the tap c e. All of the above
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. a. Acceptable Correct b. Violation Incorrect Acceptable
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. Acceptable -368.17(B) Exception
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? d. The tap conductors are sized 8 AWG copper or 2 AWG aluminum or larger.
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. Acceptable
18. A back-up power generator is provided to supply back-up power to two subpanels though a transfer switch, as shown in this figure. The nameplate of the generator shows 200 A, 240 volts, single-phase system connected from a 200-ampere main circuit breaker located on the generator. The subpanels are located 8 feet away from the wireway where the taps are located and each panel contains a 100-ampere main MCCB...... b. 3 AWG
19. A service conductor is never a tap conductor. True
Created by: Shawnt321
 

 



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