Spring Test 9 due 05/11/2013 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A grounding electrode is. a. a solid conductor b. a circuit conductor that is intentionally grounded c. a conducting object through which a direct connection to earth is established d. none of these 2. A separate portion of a conduit or tubing system that provides access through a removable cover is called. a. an FS box c. a covered conductor b. guarded d. a conduit body 3. A single-family dwelling has a demand load of 70 amperes and is supplied with a 120/240 volt, 3-wire service with a main overcurrent device rating not less than: a. 70 amperes. b. 80 amperes. c. 90 amperes. d. 100 amperes. e. 125 amperes. 4. Using standard load calculations, the feeder demand factor for five household clothes dryers is percent. a. 100 b. 85 c. 75 d. 45 5. The following bends are made in a run of RMC or EMT between a 4-square box and a pull point (an LB for example): one 10º box offset + one 45º 3-pt saddle + two 30º offsets + one 60º kick. Is this a violation of the NEC? a. No b. Yes 6. A branch circuit is. a. the wiring that runs out to the utility b. the overcurrent that supplies power c. the circuit conductors between the final overcurrent device and the outlets d. a device designed to open and close a circuit by nonautomatic means 7. A grounded conductor is. a. a solid conductor b. a circuit conductor that is intentionally grounded c. a device that establishes an electrical connection to the earth d. none of these 8. According to the Table Notes in Chapter 9 in the NEC, any section of EMT, rigid metal conduit, IMC, etc that has a length of inches or less is considered to be a nipple. a. 36 b. 18 c. 12 d. 30 e. 24
9. A central air-conditioning unit is rated single-phase, 240 volts and has a branch circuit selection current of 28 amperes marked on the nameplate. If the air-conditioner is installed in a single-family dwelling using copper nonmetallic-sheathed cable, Type NM-B, the minimum size permitted is: a. 14 AWG. b. 12 AWG. c. 10 AWG. d. 8 AWG. e. 6 AWG. 10. A feeder supplying two 4kW wall mounted ovens a a 5kW counter mounted cooktop in a dwelling unit shall have a minimum demand of_kw. a. 8.4 c. 7.15 b. 8.8 d. none of these 11. The minimum bending radius permitted by the NEC for trade size 1 conduit is inches. a. 4 1 / 2 b. 7 1 / 4 c. 5 3 / 4 d. 8 1 / 4 e. 4 12. in the NEC covers all types of wiring methods and materials, including conduit. a. Article 100 b. Chapter 2 c. Chapter 3 d. Chapter 1 13. Arc Fault Circuit Interrupter protection is not required in residences: a. for 120v receptacles in bathrooms, kitchens, and laundry rooms. b. on circuits that feed remote controlled ceiling fans. c. where EMT is the wiring method. d. as long as there is also GFCI protection. e. on multi-wire branch circuits. 14. In all dwelling units, a general use receptacle is not required: a. to serve wall counter spaces over 12 d. in an alcove more than 2 deep and 3 inches wide. feet long. b. on a 4 by 6 balcony with no stairway e. a receptacle is required in all of these to the ground. locations. c. in an unfinished basement. 15. According to the NEC Table Notes in Chapter 9, any nipple shall be permitted to be filled to percent. a. 20 b. 60 c. 40 d. 50 16. The NEC definition of voltage is. a. A force of power which will be offset buy the greater conductivity b. The greatest root-mean-square difference of potential between any two conductors of the circuit c. Electrons flowing though one point in one second d. The resulting power used by any equipment 17. What provision is required for convenient and practical use of electrical power at a 30 foot long show window in a retail commercial tenant space? a. three receptacles located within 18 d. three receptacles in the suspended inches of the top of the window. ceiling above the window. b. a 1500 watt receptacle on a sign e. one receptacle on each side of the
circuit. c. two receptacles. show window. 18. The XO terminal of a separately derived system or transformer is referred to by the 2011 NEC as the: a. neutral conductor. d. grounded service entrance conductor. b. grounding electrode point. e. white terminal. c. neutral point. 19. Oregon allows for listed and labeled electrical products to be installed because they are considered the same asas allowed for in the Oregon Revised Statute a. a NRTL approved electrical products c. an approved electrical product b. a certified electrical product d. all of these 20. A multioutlet assembly. a. consists of utility panels, raceways, and associated service boxes b. is the equipment used in conjunction with servicing commercial feeders c. is the equipment that utilizes electric energy for heating, lighting, or similar purposes d. is a type of surface, flush, or free standing raceway designed to hold conductors 21. A general supervising electrician in Oregon is authorized to design an electrical installation: a. of any photo voltaic system. d. in all commercial and residential applications. b. in locations deemed by the fire e. in manufacturing plants. marshal as hazardous. c. for customers of an electrical contractor that continuously employs him. 22. EMT bends shall be made so that the tubing is not damaged and the internal diameter of the tubing is not effectively reduced. This is a requirement of the NEC in. a. 358.26 b. 358.20(A) c. 358.28(A) d. 358.100 e. none of these 23. Flexible Metal Conduit used to connect equipment where flexibility is required after installation: a. must utilize stranded conductors. d. provides adequate grounding if listed fittings are used. b. requires the installation of an equipment grounding conductor. c. cannot be longer than 1.4 meters, (41/2 ft.). e. shall only be used in trade sizes larger than 11/4 inches 24. The minimum bending radius permitted by the NEC for trade size 1 / 2 conduit is inches. a. 4 1 / 2 b. 7 1 / 4 c. 5 3 / 4 d. 8 1 / 4 e. 4 25. When sizing a feeder, the appliance loads in dwelling units can apply a demand factor of 75 percent of nameplate ratings for or more appliances fastened in place on the same feeder. a. two b. three c. four
d. five 26. These devices generally do not require special consideration of area or volume when mounted in a box or enclosure. a. tamper resistant receptacles. d. GFCI devices. b. range or dryer receptacles. e. fire alarm system components. c. dimmer switches. 27. What is utilization equipment? a. The utility panels, raceways and associated service boxes. b. The equipment used in conjunction of servicing commercial feeders. c. Equipment that utilizes electric energy for heating, lighting, or similar purposes. d. A type of surface, flush or free standing raceway designed to hold conductors. 28. The minimum bending radius permitted by the NEC for trade size 1 1 / 4 conduit is inches. a. 4 1 / 2 b. 7 1 / 4 c. 5 3 / 4 d. 8 1 / 4 e. 4 29. A disconnecting means shall be provided for all ungrounded conductors derived from a stationary battery system over. a. 200 amps. d. 50 amps. b. 50 volts. e. 48 volts. c. 30 volts. 30. The minimum bending radius permitted by the NEC for trade size 3 / 4 conduit is inches. a. 4 1 / 2 b. 7 1 / 4 c. 5 3 / 4 d. 8 1 / 4 e. 4 31. A single-family dwelling has a service entrance with a 200 ampere main circuit breaker. All service entrance conductors are copper with 75 C insulation and terminations. The ungrounded service entrance conductors for this dwelling are size 2/0 AWG. If the maximum unbalance load calculation for this dwelling is 110 amperes, the minimum size neutral conductor permitted for the service is: a. 4 AWG. b. 3 AWG. c. 2 AWG. d. 3/0 AWG. e. 4/0 AWG. 32. The following bends are made in a run of EMT or RMC between a 4-square box and a panel: one 10º box offset + one 45º 3-pt saddle + two 30º offsets + one 30º 4-pt saddle. Is this a violation of the NEC? a. No b. Yes 33. What NEC chapter covers all types of conduit wiring methods and materials? a. 8 b. 2 c. 3 d. 1 34. For the support of EMT, the maximum distance (without using exceptions) from a box to the first strap (support) is feet.. a. 12 b. 10 c. 2 d. 3 35. Where a rigid metal conduit enters a box that is designed to provide abrasion protection, is it required to have a bushing? a. Yes b. No
36. Part II of the definitions (Article 100) covers circuits of over volts. a. 120 b. 240 c. 480 d. 600 37. A circuit breaker is. a. the wiring that runs out to the utility b. a device designed to open and close a circuit by nonautomatic means c. the circuit conductors between the final overcurrent device and the outlets d. the overcurrent that supplies power 38. As noted in the introduction to NEC Article 90, are highlighted with gray shading within sections and with vertical ruling for large blocks of changed or new text and for new tables and changed or new figures. a. changes since the last code c. deleted articles b. special areas of attention d. enforcement by local jurisdictions 39. The 3 volt-ampere per square foot for dwelling unit general lighting includes all 15- and 20-ampere general-use receptacles. The floor area shall open porches, garages, or unused or unfinished spaces not adaptable for future use. a. include b. not include 40. According to Chapter 9 - Table Notes in the NEC, any conduit that is inches or shorter in length is considered to be a nipple. a. 18 b. 28 c. 24 d. 36 41. What word or words must be included in any Code article that is mandatory? a. may, may not b. shall, shall not c. would, would not d. can, cannot 42. A fixed, stationary, or portable self-contained electrically illuminated utilization equipment is a(n). a. luminaire b. outlet c. fixture d. electric sign 43. A feeder or service neutral load can be figured at of the load on the ungrounded conductors for ranges and ovens. a. 125 percent b. 80 percent c. 70 percent d. none of the above 44. The inside of enclosures and raceways installed below grade: a. shall meet the requirements of 310.8(C). b. require connectors and splices to be listed. c. are considered wet locations. d. all of the above. e. Are considered damp locations by the 2011 NEC. 45. What is the feeder demand for one 15kW range? a. 15kW c. 9.2kW b. 12kW d. none of these 46. Type NM cable shall not be installed: a. or fished in air voids in masonry block or tile walls. d. in conduit or tubing
b. above a suspended ceiling e. in wet or damp locations c. in multi-family dwellings 47. A copper feeder with 75 C insulation and terminations supplies two 460 volt, three-phase, design B electric motors, one rated 50 horsepower and the other rated 40 horsepower. The minimum size feeder conductor permitted for this load is: a. 4 AWG. b. 3 AWG. c. 2 AWG. d. 1 AWG. e. 1/0 AWG. 48. Where installing EMT, the maximum distance (without using exceptions) between the first support and a box is. a. 12" b. 10' c. 2' d. 3' e. 24" 49. Branch circuits are rated according to. a. the size of the wire used for the circuit c. neither a nor b b. the ampere rating of the overcurrent d. either a or b device 50. For electrical metallic tubing (EMT), what is the maximum number of degrees you can bend the tubing? a. 360 b. 270 c. 180 d. 320 51. A complete lighting unit consisting of a lamp together with the parts to distribute light is a(n). a. luminaire b. outlet c. fixture d. electric sign 52. For a run of electrical metallic tubing (EMT) between a panel and a box, what is the maximum number of degrees of bends you can put in this run? a. 180 b. 270 c. 90 d. 360 e. none of these
Spring Test 9 due 05/11/2013 Answer Section MULTIPLE CHOICE 1. ANS: C REF: 2. ANS: D REF: OBJ: 106 NEC Worksheet 3. ANS: D 230.79(C) 4. ANS: B Table 220.54 5. ANS: A (2 10º) + (2 45º) + (2 30º) + (2 30º) + (60º) = 290º 2011 NEC: 344.26 & 358.26 REF: 2011 NEC: 344.26 & 358.26 6. ANS: C REF: 7. ANS: B REF: 8. ANS: E 2011 NEC: Ch 9-Table Notes REF: 2011 NEC: Ch 9-Table Notes 9. ANS: C look up the branch circuit selection current in the 60 C column Table 310.15(B)(16), 440.33, 334.80 10. ANS: C NEC 220.55, Note 3 Column B for 3 appliances is 55%. 55% X 13kW = 7.15kW
11. ANS: C 2011 NEC: Table 2 - Ch 9 REF: 2011 NEC: Table 2 - Ch 9 OBJ: 106 NEC Worksheet 12. ANS: C 2011 NEC: Chapter 3 REF: 2011 NEC: Chapter 3 13. ANS: A Article 210.12 14. ANS: E 210.52, OESC 210.52 15. ANS: B 2011 NEC: Ch 9-Table Notes REF: 2011 NEC: Ch 9-Table Notes OBJ: 106 NEC Worksheet 16. ANS: B REF: 17. ANS: A 210.62 18. ANS: C Article 100 19. ANS: B OESC 90 Amend Article 90 Introduction (1) Section 90.4 Enforcement. Amended as follows: (a) Amend 90.4 by inserting the following after the second paragraph: Requests for special permission shall be made in writing to the authority having jurisdiction. Special permission must be granted in writing by the authority having jurisdiction and shall be obtained prior to the start of the electrical installation. (A) Insert the following after Section 90.4: Section 90.4(A)Where the 2008 NEC requires electrical products to be "listed" or "labeled", the words "listed or "labeled" shall have the same meaning as "certified electrical product" under ORS 479.530. 20. ANS: D
REF: 21. ANS: C OAR 918-282-0140(1)(b) 22. ANS: E 2011 NEC: 358.24 REF: 2011 NEC: 358.24 23. ANS: B 250.118(5)(d) 24. ANS: E 2011 NEC: Table 2 - Ch 9 REF: 2011 NEC: Table 2 - Ch 9 25. ANS: C 220.53 26. ANS: A Article 314.16 27. ANS: C REF: 28. ANS: B 2011 NEC: Table 2 - Ch 9 REF: 2011 NEC: Table 2 - Ch 9 29. ANS: C 480.5 30. ANS: A 2011 NEC: Table 2 - Ch 9 REF: 2011 NEC: Table 2 - Ch 9 31. ANS: C There is no special table for sizing the neutral conductor. Table 310.15(B)(16) 32. ANS: A (2 10º) + (2 45º) + (2 30º) + (2 30º) + (4 30º) = 350º 2011 NEC: 344.26 & 358.26
REF: 2011 NEC: 344.26 & 358.26 OBJ: 106 NEC Worksheet 33. ANS: C 2011 NEC: Chapter 3 REF: 2011 NEC: Chapter 3 OBJ: 106 NEC Worksheet 34. ANS: D 2011 NEC: 358.30(A) REF: 2011 NEC: 358.30(A) 35. ANS: B 2011 NEC: 344.46 REF: 2011 NEC: 344.46 OBJ: 106 NEC Worksheet 36. ANS: D REF: 37. ANS: B REF: OBJ: 106 NEC Worksheet 38. ANS: A 2011 NEC: Article 90 preface REF: 2011 NEC: Article 90 preface OBJ: 106 NEC Worksheet 39. ANS: B 220.12 40. ANS: C 2011 NEC: Ch 9-Table Notes REF: 2011 NEC: Ch 9-Table Notes 41. ANS: B 2011 NEC: 90.5(A) REF: 2011 NEC: 90.5(A) 42. ANS: D REF: 43. ANS: C NEC 220.61 44. ANS: D
45. ANS: C NEC 220.55 Note 1 15kW - 12kW = 3kW 3 X.05 =.15 Make this a multiplier by putting a 1 in front. Go to Table 220-19, Col C...one range is 8kW. Increase this by the multiplier, 1.15. 8 X 1.15 = 9.2kW 46. ANS: E 334.12(B)(4) 47. ANS: E 65 A 1.25 = 81 A 52 A 1.00 = _52 A 133 A 430.24, Table 430.250, Table 310.15(B)(16) 48. ANS: D 2011 NEC: 358.30(A) REF: 2011 NEC: 358.30(A) 49. ANS: B 2011 NEC: 210.3 REF: 2011 NEC: 210.3 NAT: Obj 108.1 ABank 50. ANS: A 2011 NEC: 358.26 REF: 2011 NEC: 358.26 51. ANS: A REF: 52. ANS: D 2011 NEC: 358.26 REF: 2011 NEC: 358.26