Spring Test 16 due 06/14/2013
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- Madlyn Newton
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1 Spring Test 16 due 06/14/2013 Multiple Choice Identify the choice that best completes the statement or answers the question. Figure Refer to the information shown in Figure Motor 1 is rated at 30 hp and Motor 2 is rated at 7 1 / 2 hp. The smallest conductors permitted between the gutter and the switch for Motor 2 are AWG. a. 6 b. 3 c. 1/0 d. 8 e Refer to the information shown in Figure Motor 1 is rated at 30 hp and Motor 2 is rated at 7 1 / 2 hp. The smallest conductors permitted between the gutter and the switch for Motor 1 are AWG. a. 6 b. 3 c. 1/0 d. 8 e The minimum feeder load for a 40 foot long show window is VA. a b c. 10,000 d. none of these Figure Refer to the motor nameplate shown in Figure The largest 1-pole circuit breaker that can be installed in a 120/208-volt, 3Ø, 4-wire panelboard for this motor is a A. a. 125 b. 100 c. 200 d. 70 e Refer to the motor nameplate shown in Figure The largest 2-pole circuit breaker that can be installed in a 120/240-volt, 3Ø, 4-wire panelboard for this motor is a A. a. 40 b. 100 c. 50 d. 70 e For a cable or raceway that is installed through bored holes in wood members, the holes shall be bored so that the edge of the hole is not less than 1 1 / 4 " from the nearest edge of the wood member. Where this distance cannot be maintained, the cable or raceway shall be protected from penetration by nails and screws by a steel plate or bushing, at least -inch thick, and of appropriate length and width installed to cover the area of the wiring. a. 1 / 16 b. 1 / 8 c. 3 / 16 d. 7. Mandatory inspections include; a. service, feeders c. data, fire alarm b. receptacles, switches d. None of these 1 / 4
2 8. When using the optional calculation for sizing service conductors, a dwelling unit, which contains a 20 kva electric furnace, would have a computed heating load of. a. 25kVA c. 13kVA b. 20kVA d. 8kVA 9. Your body has a resistance of about 50,000 ohms between your hands. You complete a 208-volt circuit by holding one "hot" in your left hand and the other "hot" in your right hand. The current flowing in your body is about ma. a. 9.6 b. 4.2 c..24 d. 4.8 e. 2.4 Figure Refer to the motor nameplate shown in Figure The smallest branch circuit conductors that can be installed between the 2-pole circuit breaker in the 120/240-volt, 3Ø, 4-wire panelboard and the motor are AWG. a. 12 b. 14 c. 16 d. 10 e Refer to the motor nameplate shown in Figure The smallest branch circuit conductors that can be installed between the 1-pole circuit breaker in the 120/240-volt, 3Ø, 4-wire panelboard and the motor are AWG. a. 12 b. 14 c. 16 d. 10 e Aluminum fittings and enclosures shall be permitted to be used with conduit. a. steel rigid metal c. polyvinyl chloride b. aluminum rigid metal d. any of these 13. The classification of a location where easily ignitible fibers/flyings are stored or handled other than in the process of manufacture is. a. Class I, Division 1 c. Class II, Division 1 e. Class III, Division 1 b. Class I, Division 2 d. Class III, Division Conductive materials enclosing electrical conductors are grounded to. I. prevent surges of voltage II. prevent surges of lightning III. facilitate overcurrent device operation in case of ground faults a. I only b. II only c. III only d. all of these 15. Flexible cords and cables shall NOT be. a. used as elevator cables b. run through holes in walls c. used as data processing cables d. used to prevent transmission of vibration 16. According to the NEC, flat conductor cable is permitted to be used for. I. general-purpose circuit conductors II. appliance circuit conductors a. I only b. II only c. either I or II d. neither I nor II
3 17. An inspector has visited a jobsite and found that were deficiencies in the electrical installation done by an electrical contractor who took out the permit. The inspector writes a correction notice and leaves it on the job. Nobody visits the job for 4 days. The general contractor finds the note, but the electrical contractor does not get notified by the general contractor for two and a half weeks. What is the maximum time to correct the deficiencies and recall for an inspection? Is the electrical contractor (EC) or general contractor (GC) responsible? a. 5 days, EC d. 20 days, GC b. 7 days, GC e. 20 days, EC c. 7 days, EC 18. Not more than one conductor shall be connected to the grounding electrode by a single clamp or fitting unless the clamp or fitting is. a. cast bronze or brass d. all of these b. listed for multiple conductors e. none of these c " in thickness 19. Electrical installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be so made that the possible spread of fire or products of combustion will not be. a. substantially increased c. exposed b. allowed d. underrated 20. Motor Nameplate Information: 115/230-V 1Ø 1 hp Supply: 1-pole breaker in a 120/240-V, 1-ph, 3-W panel Minimum size circuit conductors are AWG. a. 8 b. 12 c. 6 d. 10 e What is the maximum distance (in feet) between supports for a straight run of 2" IMC made up with threaded couplings? a. 16 b. 10 c. 6 d. 3 e Which of the following wiring methods is permitted through an air conditioning duct? a. electrical metallic tubing b. PVC c. no wiring method is permitted in an A/C duct d. Romex 23. Type AC cable shall be secured by staples, cable ties, straps, hangers, or similar fittings at intervals not exceeding feet. a. 3 b. 10 c. 6 d. 2 e. 4 1 / Overcurrent protective devices shall be so selected and coordinated as to permit the circuit protective devices used to clear a fault without the occurrence of extensive damage to the electrical components of the circuit. This fault shall be assumed to be. I. between any circuit conductor and the equipment grounding conductor(s) or enclosing metal raceway II. between two or more of the circuit conductors a. neither I nor II b. II only c. both I and II d. I only 25. A 175-Amp breaker protects a feeder that originates in a 120/208-volt, 3-ph, 4-wire service panel in a residence. Which of the following conductors is the smallest size permitted for the feeder? a. 2/0 b. 1 c. 1/0 d. 2 e Equipment designed to open circuits under shall have an interrupting rating not less than the nominal circuit voltage and the current that is available at the line side of the equipment.
4 a. short-circuit b. overload c. ground-fault d. all of these e. none of these 27. A 1 hp, 115/230-V, 1Ø motor circuit is fed from a single-pole breaker in a 120/240-V, 1-ph, 3-W panel. The maximum permitted rating of an ITCB is A. a. 25 b. 50 c. 40 d. 30 e Motor Nameplate Information: /460-V 3Ø 3 hp Supply: 3-pole breaker in a 120/208-V, 3-ph, 4-W panel Minimum size circuit conductors are AWG. a. 10 b. 6 c. 8 d. 14 e. 12 Figure Wire connected to the motor must have the correct ampacity according to the 75 column. However, inside the conduit between the panel and the wireway ampacity corrections are made, as usual, in the 90 column. The specifications require that separate equipment grounding conductors be installed in each raceway. The engineer who wrote the specs means that a metal raceway can t be used as the only EGC. But remember that only one EGC must be installed in each conduit. Refer to the drawing shown below to answer questions that refer to this figure. 29. Refer to Figure The largest permitted breaker that can be installed in the panel for Motor 1 is A. a. 70 b. 60 c. 40 d. 35 e Which of the following are harmonic-producing loads? I. incandescent lamps II. welders III. UPS systems a. I only c. I & II only e. I & III only b. II & III only d. III only f. I, II & III 31. Armored cable installed in thermal insulation shall have conductors rated at. The ampacity of cable installed in these applications shall be that of 60 degree C conductors. a. 60 degrees C b. 194 degrees F c. 75 degrees C d. 90 degrees F Figure
5 Feeder to serve these three motors. Use Exc. 1 to (C)(1) to determine individual motor OCPDs. 32. Refer to the information shown in Figure Without regard to the future motors, the smallest conductors permitted between Panel LC and the gutter are AWG or kcmil. a. 250 b. 300 c. 4/0 d. 350 e What minimum size conductors are required to feed a watt, 240-volt electric furnace operated at 240 volts? Size the conductors per 424.3(B). The branch-circuit OCPD is a circuit breaker that is rated for 75 C. a. 6 b. 4 c. 8 d. 10 e Which of the following provides clearance requirements from walls for proper ventilation of transformer enclosures? a. The NEC d. All of these b. Job specifications e. None of these c. Manufacturer's nameplate 35. Where one or more complete paragraphs from the previous edition of the NEC have been deleted in the current edition, the deletion is identified by between the remaining paragraphs. a. a vertical ( ) line in the margin d. brackets ([ ]) around the deleted text b. a bullet ( ) e. crossed-out text c. underlined text f. none of these 36. Expansion fittings and telescoping sections of metal raceways shall be made electrically continuous by or other means. a. a main bonding jumper d. equipment bonding jumpers b. concrete encasement e. isolation c. a grounding electrode conductor 37. A 150-Amp breaker protects a feeder that originates in a 120/208-volt, 3-ph, 4-wire service panel in a school. Which of the following THHN/THWN copper conductors is the smallest size permitted for the feeder? a. 3/0 b. 1 c. 2/0 d. 2 e. 1/0 38. The allowable fill for an 1 1 / 4 -inch Schedule 40 PVC with more than 2 conductors is sq. in. a..794 b..333 c..495 d Which of these potential hazards are addressed by the requirements in the NEC? a. protection against overcurrent d. all of these b. protection against overvoltage e. none of these c. protection against fault currents 40. What is the cross sectional area of a 1 1 / 2 " rigid metal conduit? a b..829 c d 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.
6 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 42. RMC shall be securely fastened within feet of each outlet box, junction box, device box, cabinet, conduit body, or other conduit termination. a. 5 b. 20 c. 3 d. 10 e Short sections of metal enclosures used to protect from physical damage shall not be required to be connected to the equipment grounding conductor. a. service conductors c. cable assemblies b. feeders d. none of these 44. The FLA shown on a motor nameplate is used to size. a. OL protection c. conductors b. SC&GF protection d. all of these 45. One of the requirements for plan review of complex structures is. a. service of 400 amps or more c. any multifamily structure b. Service of 400 amps or more and 10,000 d. none of these A of fualt current or 150V to ground 46. A 2-pole breaker in a 120/208-V, 3-ph, 4-W panel supplies power to a circuit. This circuit is connected to a 2 hp, 208-V, 1Ø motor. A safety switch is to be installed adjacent to the motor. DETD fuses with a maximum permitted rating of A can be installed in the switch. a. 35 b. 20 c. 30 d. 40 e An insulated conductor that is intended for use as a grounded conductor, where contained within a flexible cord, shall be identified by or by other means permitted. I. a white or gray outer finish II. one or more white stripes on other than green insulation III. a green outer finish IV. a green outer finish with one or more yellow stripes a. I only b. I or II only c. III only d. III or IV only 48. One receptacle is to be installed on a dedicated (individual) branch circuit. A receptacle rated at amps could be used where the circuit is connected to a 50-A circuit breaker. I. 40 II. 50 a. either I or II b. I only c. II only d. neither I nor II Figure Refer to the nameplate and information shown in Figure The smallest BC conductors permitted are AWG.
7 a. 12 b. 8 c. 10 d. 6 e What is the minimum size THHN/THWN wire permitted to serve a load that will draw 47 amps? The load will operate for about 5 hours at a time. The branch-circuit OCPD is a circuit breaker that is rated for 75 C. a. 10 AWG b. 8 AWG c. 6 AWG d. 4 AWG e. none of these 51. The smallest wire that can be installed to serve a load that has a nameplate rating of 142 amps is AWG. The OCPD has terminations rated at 75 C. a. 4/0 b. 2/0 c. 1/0 d. 3/0 e. none of these 52. If an apartment complex has a lighting load of kva, what is the demand factor of this lighting load in kva? Each apartment contains an electric range. (The optional method is not to be used.) a. 602 kva b kva c kva d kva
8 Spring Test 16 due 06/14/2013 Answer Section MULTIPLE CHOICE 1. ANS: D Motor #1: T.FLA=88-80/40 Motor #2: T.FLA= /11 25-ft Tap ampacity Fdr Ampacity A 3 = 50 amps 8 AWG versus = A 14 AWG REF: 2011 NEC: T ; NAT: Obj ABank TOP: Sizing Feeder Taps MSC: Symbol EPS: DoubleArrow-RT 2. ANS: D Motor #1: T.FLA=88-80/40 Motor #2: T.FLA= /11 10-ft Tap ampacity Fdr OCP A 10 = 15 amps 14 AWG versus = 50 A 8 AWG REF: 2011 NEC: T ; OBJ: Obj Worksheet NAT: Obj ABank TOP: Sizing Feeder Taps MSC: Symbol EPS: DoubleArrow-RT 3. ANS: B VA = NEC: (G)(2) REF: 2011 NEC: (G)(2) OBJ: Obj Worksheet NAT: Obj ABank 4. ANS: C = 200 A standard size Reference: 2011 NEC: (C)(1); T REF: 2011 NEC: (C)(1); T OBJ: Obj Worksheet NAT: Obj ABank TOP: Sizing 1-ph Motor BC OCPDs MSC: Symbol EPS: times;doublearrow-rt 5. ANS: B = 100 A standard size 2011 NEC: (C)(1); T REF: 2011 NEC: (C)(1); T NAT: Obj ABank TOP: Sizing 1-ph Motor BC OCPDs MSC: Symbol EPS: times;doublearrow-rt 6. ANS: A 2011 NEC: 300.4(A)(1) REF: 2011 NEC: 300.4(A)(1) NAT: Obj ABank 7. ANS: A Mandatory Inspections (1) Electrical inspectors shall inspect appropriateness of the size, placement, protection and termination of the following electrical installations, note discrepancies and require correction of code violations: (a) Service entrance conductors;
9 (b) Service equipment; (c) Grounding electrode and grounding electrode conductor; (d) Bonding; (e) Overcurrent protection; (f) Branch circuits; (g) Feeders; (h) Ground-fault circuit interrupter devices (GFCI) and ground-fault protection systems (GFP); and (i) Underground installations. 8. ANS: C 1. Look in the index for Dwellings, Feeder load, calculations for, which refers to Section , the optional calculation for a dwelling unit. 2. Because this is a central electric furnace, Section (B) allows, in item 4, the service load to be calculated at 65 percent of the total central electric space-heating load: 20 kva x 0.65 = 13 kva KEY: electric heat, feeder calculation 9. ANS: B I = E R = (208) (50,000) = amps = 4.16 ma REF: Ohm's Law NAT: Obj ABank 10. ANS: B = 10 A 14 AWG 2011 NEC: T ; T (B)(16) REF: 2011 NEC: T ; T (B)(16) NAT: Obj ABank TOP: Sizing 1-ph Motor BC conductors MSC: Symbol EPS: times;doublearrow-rt 11. ANS: B = 20 A 14 AWG 2011 NEC: T ; T (B)(16) REF: 2011 NEC: T ; T (B)(16) OBJ: Obj Worksheet NAT: Obj ABank TOP: Sizing 1-ph Motor BC conductors MSC: Symbol EPS: times;doublearrow-rt 12. ANS: D 2011 NEC: with 110.3(B) REF: 2011 NEC: with 110.3(B) OBJ: Obj Worksheet NAT: Obj ABank 13. ANS: D 2011 NEC: 500.5(D)(2) REF: 2011 NEC: 500.5(D)(2) OBJ: 201 NEC Worksheet NAT: 201 NEC ABank
10 14. ANS: C 2011 NEC: 250.4(B)(4) REF: 2011 NEC: 250.4(B)(4) OBJ: 423 NEC Worksheet NAT: 423 NEC ABank 15. ANS: B 2011 NEC: REF: 2011 NEC: NAT: Obj ABank 16. ANS: C 2011 NEC: (A) REF: 2011 NEC: (A) OBJ: Obj Worksheet NAT: Obj ABank 17. ANS: E Correction of Defects (1) Defects in electrical installations noted by the electrical inspector shall be corrected and an inspection request made within 20 calendar days of the date of actual notice of deficiency. For the purpose of this rule, actual notice is given when the inspecting jurisdiction does everything required in OAR Calls for Inspection (1) All persons who take out an electrical permit, homeowners as well as electrical contractors, shall request an inspection within three working days of: (a) The completion of any electrical installation intended to be covered or concealed or that is intended to be placed into service before the final electrical inspection; and (b) The completion of all electrical installations for the job site covered by a particular permit. (2) Transactions under a master inspection permit are covered by separate requirements. 18. ANS: B 2011 NEC: REF: 2011 NEC: OBJ: 423 NEC Worksheet NAT: 423 NEC ABank 19. ANS: A 2011 NEC: REF: 2011 NEC: OBJ: Obj Worksheet NAT: Obj ABank 20. ANS: E Table FLA = 16 amps = 20 A 14 AWG at 75º terminations
11 2011 NEC: T ; T (B)(16) REF: 2011 NEC: T ; T (B)(16) NAT: Obj ABank TOP: Sizing 1-ph Motor BC conductors MSC: Symbol EPS: times;doublearrow-rt 21. ANS: A 2011 NEC: (B)(2) with T (B)(2) REF: 2011 NEC: (B)(2) with T (B)(2) OBJ: Obj Worksheet NAT: Obj ABank 22. ANS: A 2011 NEC: (B) REF: 2011 NEC: (B) NAT: Obj ABank 23. ANS: E 2011 NEC: (C) REF: 2011 NEC: (C) OBJ: Obj Worksheet NAT: Obj ABank 24. ANS: C 2011 NEC: REF: 2011 NEC: OBJ: 422 NEC Worksheet NAT: 422 NEC ABank 25. ANS: A T (B)(7) applies to 120/240 1-ph only >> use T (B)(16) REF: 2011 NEC: T (B)(7) N/A NAT: Obj ABank 26. ANS: D 2011 NEC: REF: 2011 NEC: NAT: Obj ABank 27. ANS: C Table FLA = 16 amps = 40-A breaker 2011 NEC: (C)(1); T REF: 2011 NEC: (C)(1); T OBJ: Obj Worksheet NAT: Obj ABank TOP: Sizing 1-ph Motor BC OCPDs MSC: Symbol EPS: times 28. ANS: D Table FLA = 10.6 amps = 13.3 A 14 AWG at 75º terminations 2011 NEC: T ; T (B)(16) REF: 2011 NEC: T ; T (B)(16) NAT: Obj ABank TOP: Sizing 3-ph Motor BC conductors MSC: Symbol EPS: times;doublearrow-rt 29. ANS: A Motor 1 - Table FLA = 28 amps = 70-A breaker 2011 NEC: (C)(1); T REF: 2011 NEC: (C)(1); T OBJ: Obj Worksheet NAT: Obj ABank
12 TOP: Sizing 1-ph Motor BC OCPDs MSC: Symbol EPS: times 30. ANS: B REF: Gen Knowledge NAT: Obj ABank 31. ANS: B 2011 NEC: (A) REF: 2011 NEC: (A) NAT: Obj ABank 32. ANS: B Motor #1: T.FLA= /7.6 Motor #2: T.FLA= /65 Motor #3: T.FLA=88-80/40 [ ] = A 300 kcmil is minimum permitted size REF: 2011 NEC: T ; OBJ: Obj Worksheet NAT: Obj ABank TOP: Sizing Feeder Conductors MSC: Symbol EPS: DoubleArrow-RT 33. ANS: B I = [ %] 240 = amps #4 with a 90 amp OCP REF: 2011 NEC: (A)(1) & 424.3(B) NAT: Obj ABank 34. ANS: C 2011 NEC: REF: 2011 NEC: OBJ: Obj Worksheet NAT: Obj ABank 35. ANS: B 2011 NEC: page REF: 2011 NEC: page OBJ: Obj Worksheet NAT: Obj ABank 36. ANS: D 2011 NEC: REF: 2011 NEC: NAT: Obj ABank 37. ANS: E 2011 NEC: T (B)(16) REF: 2011 NEC: T (B)(16) OBJ: Obj Worksheet NAT: Obj ABank 38. ANS: D 2011 NEC: ;Ch 9-Table 4 REF: 2011 NEC: ;Ch 9-Table 4 OBJ: Obj Worksheet NAT: Obj ABank 39. ANS: D 2011 NEC: 90.1(D)_(I-Note) REF: 2011 NEC: 90.1(D)_(I-Note) NAT: Obj ABank 40. ANS: A 2011 NEC: 344;Ch 9-Table 4 REF: 2011 NEC: 344;Ch 9-Table 4 NAT: Obj ABank 41. ANS: B
13 (5)(d) 42. ANS: C 2011 NEC: (A) REF: 2011 NEC: (A) NAT: Obj ABank 43. ANS: C 2011 NEC: Exc 2 REF: 2011 NEC: Exc 2 OBJ: 423 NEC Worksheet NAT: 423 NEC ABank 44. ANS: A 2011 NEC: 430.6(A)(2) REF: 2011 NEC: 430.6(A)(2) OBJ: Obj Worksheet NAT: Obj ABank 45. ANS: B Electrical Plan Review for Complex Structures (1) A jurisdiction providing electrical code plan review services may only require electrical plan review for a complex structure. For the purpose of this rule, "complex structures" have an electrical system designed, constructed or reconstructed with any of the following: (a) Ampacity: (A) A service or feeder beginning at 400 Amps where the available fault current exceeds 10,000 Amps at 150 Volts or less to ground or exceeds 14,000 Amps for all other installations; or (B) Installation of a 150 KVA or larger separately derived system as defined in Article 100 of the National Electrical Code (NEC); or (C) Addition of a new motor load of 100 HP or more; or (D) Fire pump installations as defined in Article 695 of the NEC; or (E) Emergency systems installations as defined in Article 700 of the NEC; or (F) A service or feeder rated at 600 Amps or over. (b) Voltage. More than 600 supply volts nominal. (c) Height. More than three stories. (d) Occupancy. (A) Six or more residential units in one structure; or (B) An "A" (Assembly) occupancy, "E" (Educational) occupancy, or "I-2" or "I-3" (Institutional) occupancy as defined in the adopted Oregon Structural Specialty Code; or (C) Any of the following special occupancies as described in Chapter 5 of the NEC adopted by the board in OAR : (i) Hazardous (Classified) locations as defined in Articles 500 to 516; or
14 (ii) Installations in patient care areas of health care facilities as defined in Article 517; or (iii) Agricultural buildings used for commercial purposes, as defined in Article 547; or (iv) Floating buildings as defined in Article 553; or (v) Marinas and boat yards as defined in Article 555; or (e) Recreational Vehicle Park. A new recreational vehicle park, or any addition or alteration to an existing park. 46. ANS: E Table FLA = 13.2 amps = A fuse 2011 NEC: (C)(1) Exc 1; T REF: 2011 NEC: (C)(1) Exc 1; T NAT: Obj ABank TOP: Sizing 1-ph Motor BC OCPDs MSC: Symbol EPS: times;arrow-up 47. ANS: B 2011 NEC: 200.6(C) REF: 2011 NEC: 200.6(C) OBJ: Obj Worksheet NAT: Obj ABank 48. ANS: C 2011 NEC: (B)(1) REF: 2011 NEC: (B)(1) NAT: Obj ABank 49. ANS: C Table FLA = /27 amps = AWG 2011 NEC: REF: 2011 NEC: NAT: Obj ABank TOP: Sizing 3-ph Motor BC conductors MSC: Symbol EPS: times;doublearrow-rt 50. ANS: C 47 x 1.25 = amps 59 amps minimum ampacity at the 75 breaker this calls for 6 AWG as a minimum wire size on a 60 A breaker REF: 2011 NEC: (A)(1) OBJ: Obj Worksheet NAT: Obj ABank 51. ANS: C 2011 NEC: (A)(1) REF: 2011 NEC: (A)(1) NAT: Obj ABank 52. ANS: D = % = % = % = kva REF: 2011 NEC: T OBJ: Obj Worksheet NAT: Obj ABank
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