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Master Electricians Drill 2011 #9 O 1. After all demand factors have been taken into consideration for an office building, the demand load is determined to be 90,000 VA. Where the building has a 120/240 volt, single-phase electrical system, what MINIMUM size copper conductors with THHW insulation are required for the underground service-lateral conductors? 400 kcmil B. 350 kcmil C. 300 kcmil D. 500 kcmil A. Question Answer 1. D Reference NEC PG. # Tbl. 310.15(B)(16) Single –phase current 154 Formula I= Power Volts I = 90,000VA = 375 amperes 240 volts *Note – Size 500 kcmil THHW conductors with an allowable ampacity of 380 amperes should be selected. O 2. A commercial building is to be supplied with a transformer having a 480Y/277 volt, 3-phase primary and a 208Y/120 volt, 3phase secondary. The secondary will have a balanced computed demand load of 416 amperes per phase. The transformer is required to have a MINIMUM kVA rating of _______. 100 kVA B. 150 kVA C. 86 kVA D. 200 kVA A. Question Answer 2. B Reference NEC PG. # 3 – phase power Formula VA = I x E x 1.732 O VA = 416 amperes x 208 volts x 1.732 O 149,866 VA ÷ 1,000 = 149.8 kVA O 3. What is the MINIMUM size equipment bonding jumper allowed for receptacles connected to a 20-ampere branch circuit in a critical care area of a hospital? 8 AWG B. 10 AWG C. 12 AWG D. 14 AWG A. Question Answer 3. B Reference NEC PG. # 517.19(C) 444 O 4. The branch circuit conductors supplying one or more units of information technology equipment shall have an ampacity of NOT less than ________ of the connected load. 80 percent B. 100 percent C. 115 percent D. 125 percent A. Question Answer 4. D Reference NEC PG. # 645.5 (A) 561 O 5. In Class II, Division I hazardous locations, an approved method of connection of conduit boxes is __________. Compression fittings B. Threaded bosses C. Welding D. All of these A. Question Answer 5. B Reference NEC PG. # 502.10(A)(1)(4) 386 O 6. Where a motor of more than 1 horsepower has a temperature rise of 50°C indicated on the nameplate, for the purpose of selecting the overload device, this device shall be selected to trip at NO more than ________ of the motor’s full-load ampere rating. (No exceptions or modifications permitted.) 100 percent B. 115 percent C. 125 percent D. 130 percent A. Question Answer 6. B Reference NEC PG. # 430.32(A)(1) 319 O 7. The MINIMUM burial depth for conduit or cables installed under an airport runway, concourse or tarmac is ______. 1 ½ feet B. 2 feet C. 3 feet D. 1 foot A. Question Answer 7. A Reference NEC PG. # Tbl. 300.5 138 O 8. Liquidtight flexible metal conduit (LFMC) is approved for use as an equipment grounding conductor if it does NOT exceed _______ in length. 10 feet B. 12 feet C. 6 feet D. 8 feet A. Question Answer 8. C Reference NEC PG. # 250.118(6)d. 122 O 9. Conductors supplying more than one (1) motor shall have an ampacity of NOT less than ______ of the full-load current rating of the largest motor in the group and 100% of the full-load current ratings of all the other motors in the group. 125 percent B. 110 percent C. 150 percent D. 175 percent A. Question Answer 9. A Reference NEC PG. # 430.24(1)&(2) 318 O 10. Determine the MINIMUM size THWN copper branch-circuit conductors permitted to supply an ac motor when given the following related information: All terminations are rated for 75°C Nameplate current rating is 25 amperes 15 minute rated motor Short-time duty 12 AWG B. 10 AWG C. 8 AWG D. 6 AWG A. Question Answer 10. B Reference NEC PG. # 430.22(E) Tbl. 430.22(E) Tbl.310.15(B)(16) 316 317 154 FLC of motor = 25 amperes x 120% = 30 amperes * NOTE – Size 10 AWG THWN copper conductors with an allowable ampacity of the 35 amperes should be selected O 11. When intermediate metal conduit (IMC) is threaded in the field, a standard cutting die with a ________ taper per ft. shall be used. 3/8 in. B. 1/2 in. C. 3/4 in. D. 1 in. A. Question Answer 11. C Reference NEC PG. # 342.28 202 O 12. Apply no exceptions and determine the MAXIMUM standard size nontime-delay fuse permitted for branch-circuit, short-circuit, and ground-fault protection for an ac motor where given the following related information: 2 hp – 120 volts, single-phase Continuous-duty Nameplate current rating – 22 amperes No code letter 70 amperes B. 80 amperes A. C. 85 amperes D. 90 amperes Question Answer 12. A Reference NEC PG. # 430.6(A)(1) Tbl. 430.248 240.6(A) 311 337 91 FLC of motor - 24 amperes x 300% = 72 amperes * NOTE - In this case you must go down to the next standard size nontime - delay fuse with an ampere rating of 70 amperes O 13. Which of the following listed is NOT permitted for sues as both controller and disconnecting means for a motor? Inverse time circuit breaker B. Instantaneous-trip circuit breaker C. Oil switch D. Air-break switch A. Question Answer 13. B Reference NEC PG. # 430.111(B)(1),(2)&(3) 332 O 14. Under which, if any, of the following conditions is the neutral conductor to be counted as a current-carrying conductor? O I. When it is only carrying the unbalanced current of a single-phase system O II. When it is the neutral of a 3-phase wyeconnected system that consists of nonlinear loads. I only B. II only C. Neither I nor II D. Both I and II A. Question Answer 14. B Reference NEC PG. # 310.15(B)(5)(a)&(c) 152 O 15. Ceiling-suspended luminaires or paddle fans located ______ or more above the maximum water level of a spa or hot tub shall NOT require GFCI protection. 10 feet B. 7 ½ feet C. 8 feet D. 12 feet A. Question Answer 15. D Reference NEC PG. # 680.43(B)(1)(a) 587 O 16. A junction box to be installed will contain the following: Three – size 6 AWG ungrounded conductors Three – size 6 AWG grounded conductors One – size 8 AWG equipment grounding conductor Three – size 12 AWG ungrounded conductors Three – size 12 AWG grounded conductors One – size 12 equipment grounding conductor Four – internal clamps O The junction box is required to have a volume of at LEAST _______. A. B. 51.50 cubic inches 53.75 cubic inches C. 46.50 cubic inches D. 56.50 cubic inches Question Answer 16. A Reference NEC PG. # Tbl. 314.16(B) 314.16(B)(1)&(2) 179 178 Size 6 AWG ungrounded conductors 3 x 5.00 cu. In. = 15.00 cu.in. Size 6 AWG grounded conductors 3 x 5.00 cu. In. = 15.00 cu.in. Size 8 AWG grounding conductors 1 x 3.00 cu.in. = 3.00 cu.in. Size 12 AWG ungrounded conductors 3 x 2.25 cu.in. = 6.75 cu.in. Size 12 AWG grounded conductors 3 x 2.25 cu.in. = 6.75 cu.in. Size 12 AWG grounding conductors Internal clamps -0- 1 x 5.00 cu.in. = Total = 5.00 cu.in. 51.50 cu.in. O 17. Where conductors of size 4 AWG or larger are installed in conduits entering a junction box and straight pulls of the conductors are to be made, the length of the box shall NOT be less than _______ times the trade of the largest raceway. Six B. Eight C. Ten D. Twelve A. Question Answer 17. B Reference NEC PG. # 314.28(A)(1) 183 O 18. With respect to service-drop conductors and open overhead wiring of not more than 750 volts to ground, the MINIMUM vertical clearance that must be maintained from the base of a swimming pool diving board and the conductors is _________. 14 ½ feet B. 16 ½ feet C. 20 ½ feet D. 22 ½ feet A. Question Answer 18. D Reference NEC PG. # 680.8(A) Fig. 680.8 Tbl. 680.8 577 578 578 O 19. The life safety branch of the emergency system of a health care facility shall provide power to ______. O I. automatic doors used for building egress O II. Illuminate electrical equipment I only B. II only C. Both I and II D. Neither I nor II A. Question Answer 19. A Reference NEC PG. # 517.32(H) 448 O 20. When a building contains _______, the building may have more than one service without special permission being granted from the local authority having jurisdiction. Exit lights B. Fire pumps C. Computers D. Four-hour rated fire-resistant walls A. Question Answer 20. B Reference NEC PG. # 230.2(A)(1) 78 O 21. In general, service-drop conductors shall have a vertical clearance of at LEAST _______ above the roof surface of a building having no overhang. 10 feet B. 12 feet C. 14 feet D. 8 feet A. Question Answer 21. D Reference NEC PG. # 230.24(A) 80 O 22. In general, the phase arrangement on the three-phase busses for a three-phase panelboard or switchboard shall be A, B, C, as viewed from __________. O I. Back to front O II. Bottom to top I only B. II only C. Neither I nor II D. Both I and II A. Question Answer 22. C Reference NEC PG. # 408.3(E) 274 O 23. Where a conductor is marked RHW-2 on the insulation what does the -2 represent? The cable has 2 conductors. B. The conductor is double insulated C. The conductor has a nylon outer jacket D. The conductor has a maximum operating temperature of 90°C A. Question Answer 23. (D) Reference NEC PG. # Tbl. 310.104(A) 168 O 24. Which of the following listed raceways is NOT permitted for use of enclosing control wiring for electric motor-driven fire pumps? Flexible metal conduit (FMC) B. Liquidtight flexible metal conduit (LFMC) C. Liquidtight flexible nonmetallic conduit (LFNC) D. Intermediate metal conduit (IMC) A. Question Answer 24. A Reference NEC PG. # 695.14(E) 620 O 25. In a hospital, low-voltage equipment that is frequently in contact with the bodies of persons, must operate on a voltage of _____ or less or be moisture resistant, double insulated or approved as intrinsically safe. 10 volts B. 24 volts C. 50 volts D. 120 volts A. Question Answer Reference NEC PG. # 25. A 517.65(A)(1),(2)&(3) 455 O 26. A grounding electrode that is the sole connection to the made grounding electrode, shall NOT be required to be larger than size _____ copper conductor. 1/0 AWG B. 6 AWG C. 4 AWG D. 3/0 AWG A. Question Answer 26. B Reference NEC PG. # 250.66(A) 115 O 27. For solar photovoltaic systems, locating the system grounded connection point as close as practicable to the photovoltaic source better protects the system from _________. Excessive voltage drop B. Excessive resistance in the grounding system C. Voltage surges due to the lighting D. Voltage surges due to ground-faults A. Question Answer 27. C Reference NEC PG. # 690.42,IN 603 O 28, Transformers containing oil or a liquid that will burn where located in Class I, Division 1 locations shall be _______. Enclosed in a fence B. Installed in vaults only C. Identified for Class I locations D. Installed in a fire-resistant room A. Question Answer 28. B Reference NEC PG. # 501.100(A)(1) 381 O 29. Where liquidtight flexible metal conduit (LFMC) is installed in a Class I, Division 2 hazardous location, it shall be permitted to delete the bonding jumper, where the LFMC is NOT longer than _______ and the overcurrent protection in the circuit is limited to _______ or LESS and the load is not a power utilization load. 6 feet – 20 amperes B. 10 feet – 10 amperes C. 6 feet – 10 amperes D. 6 feet – 15 amperes A. Question Answer 29. C Reference NEC PG. # 501.30(B),Ex.(1)&2 381 O 30. Which one of the following wiring methods is permitted to be installed in ducts specifically fabricated for environmental air? Rigid polyvinyl chloride conduit (PVC) B. Electrical metallic tubing (EMT) C. Armored Cable (AC) D. Nonmetallic sheathed cable (NM) A. Question Answer 30. B Reference NEC PG. # 300.22(B) 144 O 31. An adjustable overload protection device protecting a single phase, 240-volt, continuous-duty, 5 hp, ac motor with a FLA rating of 26 amperes and a temperature rise of 50°C marked on the nameplate, shall be selected to trip at NOT more than ______. (Consider the value you select will enable the motor to start without tripping and modification of this value is not necessary) 29.9 amperes B. 32.2 amperes C. 33.8 amperes D. 36.4 amperes A. Question Answer 31. A Reference NEC PG. # 430.6(A)(2) Tbl.430.248 430.32(A)(1) 312 337 319 FLA of motor = 26 amperes x 115% = 29.9 amperes O 32. In Class II, Division 1 locations, where pendant mounted luminaires are suspended by rigid metal conduit (RMC) and a means for flexibility is not provided, the RMC shall have a length of NOT more than ________. 12 inches B. 18 inches C. 24 inches D. 30 inches A. Question Answer 32. A Reference NEC PG. # 502.130(B)(4) 390 O 33. A commercial kitchen is to have the following cooking related equipment installed: One – 14 kW range One – 5.0 kW water heater One – 0.75 kW mixer One – 2.5 kW dishwasher One – 2.0 kW booster heater One – 2.0 kW broiler O Determine the demand load, in kW, after applying the demand factors for the kitchen equipment. 19.00 kW B. 26.25 kW A. C. 18.38 kW D. 17.06 kW Question Answer 33. A Reference NEC PG. # 220.56 Tbl.220.56 65 67 14.00 kw – range 5.00 kw - water heater 0.75 kw – mixer 2.50 kw – dishwasher 2.00 kw – booster heater 2.00 kw – broiler 26.25 kw – total connected load x 65% = 17.06 • • NOTE – However the NEC ® states the demand shall not be less than the two largest pieces of equipment. 14.00 kw + 5.00 kw = 19 kw demand O 34. In a minor repair commercial garage, any unventilated pit or below-grade work area is classified as a _______ hazardous location, where gaseous liquids and fuels are not transferred. Class I, Division 2 B. Class II, Division 1 C. Class II, Division 2 D. Class I, Division 1 A. Question Answer 34. A Reference NEC PG. # 511.3(D)(3)(b) 421 O 35. Where a motor controller enclosure is located outdoors and is subject to be exposed to sleet, it shall have a MINIMUM rating of _______, where the controller mechanism is required to be operable when ice covered. Type 3 B. Type 3S C. Type 3R D. Type 3SX A. Question Answer 35. B Reference NEC PG. # Tbl. 110.28 41 O 36. When buried raceways pass under a commercial driveway or parking lot the MINIMUM cover requirements ______. Decrease if installed in rigid metal conduit (RMC) B. Do not change in regard to wiring methods used C. Shall be increased for direct-buried cables D. Shall be increased, decreased or remain the same, depending on the wiring method used A. Question Answer 36. B Reference NEC PG. # Tbl. 300.5 138 O 37. The National Electrical Code® requires ventilation of a battery room where batteries are being charged to prevent ___________. Battery corrosion B. Electrostatic charge C. Deterioration of the building steel D. An accumulation of an explosive mixture A. Question Answer 37. D Reference NEC PG. # 480.9(A) 360 O 38. For other than Design B energy-efficient motors, where the setting specified in Table 430.52 of the NEC® is not sufficient for the starting current of the motor, the setting of an instantaneous trip circuit breaker shall be permitted to be increase3d, but in NO case exceed ________ of the full-load current of the motor. 1300 percent B. 1700 percent C. 1100 percent D. 800 percent A. Question Answer 38. A Reference NEC PG. # 430.52(C)(3), Ex.1 323 O 39. Where given the following related information, determine the MAXIMUM standard size overcurrent protection required for the primary and secondary side of a transformer, when primary and secondary overcurrent protection is to be provided. 150 kVA rating Primary – 480 volt, 3-phase, 3-wire Secondary – 208Y/120 volt, 3-phase, 4- wire A. B. C. D. Primary – 500 amperes, Secondary – 500 amperes Primary – 450 amperes, Secondary – 600 amperes Primary – 500 amperes, Secondary – 450 amperes Primary – 450 amperes, Secondary – 500 amperes Question Answer 39. B Reference NEC PG. # 3 – Phase Current Formula 450.3(B) Tbl. 450.3(B) 240.6(A) 348 349 91 (Primary) I= VA___ I = __150,000__ = 150,000 = 180 amps x 250% = 450 amps E x 1.732 480 x 1.732 831.36 (Secondary ) I= VA___ I = __150,000__ = 150,000 = 416 amps x 250% = 520 amps E x 1.732 208 x 1.732 36.25 O 40. For capacitors of over 600 volts, a means shall be provided to reduce the residual voltage of a capacitor to ________ after the capacitor is disconnected from the source of supply. 50 volts or less within 1 minute B. 24 volts or less within 1 minute C. 50 volts or less within 10 minutes D. 50 volts or less within 5 minutes A. Question Answer 40. D Reference NEC PG. # 460.28(A) 358 O 41. Apply no exceptions and determine the MAXIMUM standard size time-delay fuses permitted to be used for branch-circuit, short-circuit, and ground-fault protection for a 15 hp, 480-volt, three-phase, continuousduty, wound rotor motor. 35 amperes B. 40 amperes C. 50 amperes D. 55 amperes A. Question Answer 41. A Reference NEC PG. # 430.6(A)(1) Tbl. 430.250 Tbl. 430.52 240.6(A) 311 338 323 91 FLC of motor = 21 amperes x 175% = 36.75 amperes * NOTE – In this situation you are required to go DOWN to the next standard size fuses with a rating of 35 amperes O 42. In general, when conductors of different insulation rating are installed in a common raceway and the voltage is 600 colts or less, the NEC® requires __________. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor on the raceway B. The conduit allowable fill to be limited to 31 percent C. All conductors within the raceway shall have a temperature rating of 75°C D. The insulation of the lower rated conductors to be identified with blue or yellow colors. A. Question Answer 42. A Reference NEC PG. # 300.3(C)(1) 136 O 43. Where used outdoors, aluminum grounding conductors shall NOT be terminated within _____ of the earth. 18 inches B. 24 inches C. 3 feet D. 6 feet A. Question Answer 43. A Reference NEC PG. # 250.64(A) 113 O 44. A 6,000 sq. ft. bank building is to be constructed and the number of generalpurpose receptacles to be installed in the building is yet to be determined; the building will also have an electric sign. Determine the MINIMUM number of 120-volt, 20-ampere branch circuits required for the lighting, receptacles and the sign. 12 B. 13 C. 14 D. 15 A. Question Answer 44. D Reference NEC PG. # Art. 100 210.19(A)(1) Tbl. 220.12 600.5(A) 27 52 63 519 6000 sq. ft. x 3.5 VA = 21,000 VA x 125% = 26,250 VA (lighting ) 6000 sq. ft. x 1.0 VA = 6,000 VA (receptacles) 32,250 VA ( recpts. & ltg.) 120 volts x 20 amperes = 2,400 VA of one circuit 32,250 VA (load)/2,400 VA (one circuit) = 13.4 ckts. = 14 circuits 14 circuits ( lighting & receptacles) + 1 sign circuit = 15 circuits total O 45. Enclosures containing circuit breakers, switches and motor controllers located in Class II, Division 2 locations, shall be ______ or otherwise identified for the location. Gastight B. Vapor-proof C. Dust tight D. Stainless steel A. Question Answer 45. C Reference NEC PG. # 502.115(B) 388 O 46. Where installed for a commercial occupancy, determine the MINIMUM size THWN copper conductors required from the terminals of a 3-phase, 480Y/277 volt, 4wire, 200 kW generator to the first distribution device(s) containing overcurrent protection, where the design and operation of the generator does NOT prevent overloading. 250 kcmil B. 300 kcmil C. 400 kcmil D. 500 kcmil A. Question Answer 46. B Reference NEC PG. # 3 – Phase current Formula 455.13 Tbl. 310.15(B)(16) 347 154 I = kW x 1,000 I = 200 x 1,000 = 200,00 = 240.56 amperes (FLC) volts x 1.732 480 x 1.732 831.36 241 amperes x 115% = 277 amperes (required ampacity of conductors) *NOTE – Size 300 kcmil THWN conductors with an allowable ampacity of 285 amperes should be selected. O 47. Where required, conduit seals installed in Class I Divisions 1 & 2 locations shall have the minimum thickness of the sealing compound not less than the trade size of the sealing fitting and, in NO case less than _______ thick. 1/2 in. B. 5/8 in. C. 3/4 in. D. 1 in. A. Question Answer 47. B Reference NEC PG. # 501.15(C)(3) 379 O 48. A dwelling unit to be built will have 1,400 sq. ft. of livable space on the main floor, a 1,400 sq. ft. basement (unfinished but adaptable for future use), a 200 sq. ft. open porch and a 600 sq. ft. garage. Determine the MINIMUM number of 15ampere, 120-volt general lighting branchcircuits required for the dwelling. Four B. Five C. Six D. Seven A. Question Answer 48. B Reference NEC PG. # 220.12 Tbl. 220.12 61 63 1,400 sq. ft. + 1,400 sq. ft. = 2,880sq. Ft. x VA = 8,400 VA 120 volts x 15 amperes = 1,800 VA of one circuit 8,400 VA (load) 4.6 = 5 circuits total 1,800 VA ( one circuit) O 49. The optional method of feeder and service load calculations for dwelling units is reserved for feeder and service conductors with a MINIMUM ampacity of ________ or greater. 400 amperes B. 200 amperes C. 150 amperes D. 100 amperes A. Question Answer 49. D Reference NEC PG. # 220.82(A) 67 O 50. In an industrial establishment, what is the MAXIMUM length of 200 ampere rated busway that may be tapped to a 600 ampere rated busway, without additional overcurrent protection? 10 feet B. 25 feet C. 50 feet D. 75 feet A. Question Answer 50. C Reference NEC PG. # 368.17(B),Ex. 225 O 51. Thermal insulation is not permitted to be installed above a recessed luminaire or WITHIN _____ of the recessed luminaire’s enclosure, wiring compartment, ballast, transformer, LED driver or power supply, unless the luminaire is identified as Type IC for insulation contact. 3 inches B. 4 inches C. 6 inches D. 8 inches A. Question Answer 51. A Reference NEC PG. # 410.116(B) 286 O 52. What is the MINIMUM height allowed for a fence enclosing an outdoor installation of 2,400 volt electrical equipment? 6 feet B. 7 feet C. 8 feet D. 9 feet A. Question Answer 52. B Reference NEC PG. # 110.31 40 O 53. All exposed non-current-carrying metal parts of an information technology system shall ______ or shall be double insulated. Be bonded to the equipment grounding conductor B. Not be bonded to the equipment grounding conductor C. Be bonded to the grounded conductor D. Be isolated A. Question Answer 53. A Reference NEC PG. # 645.15 562 O 54. Storage batteries used as a source of power for emergency systems shall be of a suitable rating and capacity to supply and maintain the total load for at LEAST________. 1/2 hour B. 1 hour C. 1 ½ hour D. 2 hours A. Question Answer 54. C Reference NEC PG. # 700.12(A) 624 O 55. Circuit breakers rated at _____ or less and 600 volts or less shall have the ampere rating molded, stamped, etched or similarly marked into their handles or escutcheon areas. 600 amperes B. 200 amperes C. 400 amperes D. 100 amperes A. Question Answer 55. D Reference NEC PG. # 240.83(B) 96 O 56. What percent of electrical supplied spaces in a recreational vehicle park must be equipped with at least one (1) 30-ampere 125-volt receptacle outlet? 75 percent B. 60 percent C. 70 percent D. 100 percent A. Question Answer 56. C Reference NEC PG. # 551.71 500 O 57. A straight pull of size 250 kcmil and 350 kcmil conductors is to be made in a junction box that will have one (1) 3 in. conduit and two (2) 2 ½ in. conduits entering on the same side and exiting on the opposite wall. No splices or terminations will be made in the box. Which of the following listed junction boxes is the MINIMUM required for this installation? 18 in. x 12 in. B. 20 in. x 18 in. C. 20 in. x 20 in. D. 24 in. x 24 in. A. Question Answer 57. D Reference NEC PG. # 314.28(A)(1) 183 3 in. (largest conduit) x 8 = 24 in. O 58. Where conduits enter a floor-standing switchboard or panelboard at the bottom, the conduits, including their end fittings, shall NOT rise more than _______ above the bottom of the enclosure. 6 inches B. 3 inches C. 2 inches D. 4 inches A. Question Answer 58. B Reference NEC PG. # 408.5 275 O 59. A bonding jumper connected between the communications grounding electrode and power grounding electrode system at the building or structure service where separate electrodes are used shall NOT be smaller than ______ copper. 8 AWG B. 6 AWG C. 12 AWG D. 10 AWG A. Question Answer 59. B Reference NEC PG. # 800.100(D) 674 O 60. Which of the following listed copper conductors, is the MINIMUM size 75°C rated conductors required to supply a continuous-duty, 25 hp, 208-volt, 3-phase motor, where the motor is on the end of a short conduit run that contains only three (3) conductors, at an ambient temperature of 115°F? 1 AWG THWN B. 2 AWG THWN C. 1 AWG THHN D. 1/0 AWG THWN A. Question Answer Reference NEC PG. # 60. A 430.22 Tbl. 430.250 Tbl. 310.15(B)(16)(a) Tbl. 310.15(B)(16) 316 338 150 154 25 hp motor FLC = 74.8 amperes x 125% = 93.5 amperes 93.5 amperes ÷ .75 (temperature correction) = 124.6 amperes * NOTE – The wire size needs to be increased because of the elevated ambient temperature. Size 1 AWG THWN conductors with allowable ampacity of 130 amperes should be selected O 61. Single-conductor cable Type ______ shall be permitted in exposed outdoor locations in photovoltaic source circuits for photovoltaic module interconnections within the photovoltaic array. UF B. THHN C. USE-2 D. THWN A. Question Answer 61. C Reference NEC PG. # 690.31(B) 601 O 62. For track lighting installed in a retail store, a MAXIMUM of two (2) feet of lighting track or fraction thereof shall be considered ______. 150 VA B. 180 VA C. 200 VA D. 100 VA A. Question Answer 62. A Reference NEC PG. # 220.43(B) 64 O 63. Where fixed wiring above bulk fuel storage tanks is installed in PVC conduit, the PVC shall be Schedule ________. 20 B. 40 C. 80 D. 100 A. Question Answer 63. C Reference NEC PG. # 515.7(A) 429 O 64. Disregarding exceptions, the MINIMUM size grounded or undergrounded conductors permitted to be connected in parallel is _____. 6 AWG B. 1 AWG C. 2 AWG D. 1/0 AWG A. Question Answer 64. D Reference NEC PG. # 310.10(H)(1) 429 O 65. In general, 4 in. wide underfloor raceways shall have a covering of wood or concrete of NOT less than _______ above the raceway. ½ in. B. ¾ in. C. 1 in. D. 1 ¼ in. A. Question Answer 65. B Reference NEC PG. # 390.4(A) 238 O 66. Exposed trade size ¾ in. Schedule 40 PVC conduit is required to be securely supported at intervals NOT to exceed _______. 3 feet B. 4 feet C. 6 feet D. 8 feet A. Question Answer 66. A Reference NEC PG. # 352.30(B) Tbl. 352.30 209 210 O 67. Receptacles located within the patient care areas of pediatric wards shall be ______ or shall employ a listed tamperresistant cover. 15 ampere rated B. Provided with GFCI C. A single receptacle type D. Listed tamper-resistant A. Question Answer 67. D Reference NEC PG. # 517.18(C) 444 O 68. What is the MAXIMUM length permitted of a flexible cord that may be used to cordand-plug connect a water circulating pump motor for a swimming pool at a dwelling? 3 feet B. 4 feet C. 6 feet D. 10 feet A. Question Answer 68. A Reference NEC PG. # 680.21(A)(5) 579 O 69. The MAXIMUM height above the floor or working platform to the center of the operating handle of a service disconnecting switch when it is in the ON position must not exceed ______. 6 feet B. 6 ft. 6 in. C. 6 ft. 7 in. D. 7 feet A. Question Answer 69. C Reference NEC PG. # 404.8(A) 267 & 268 O 70. The upward discharging vent of an underground fuel tank of motor fuel dispensing facilities is classified as a Class I, Division 1 location WITHIN ______ of the open vent. 3 feet B. 5 feet C. 6 feet D. 8 feet A. Question Answer 70. B Reference NEC PG. # Tbl. 514.3(B)(1) 427 O 71. Flexible metallic tubing (FMT) shall NOT be used in lengths exceeding _______. 5 feet B. 6 feet C. 8 feet D. 10 feet A. Question Answer 71. B Reference NEC PG. # 360.12(6) 219 O 72. Unless approved for a higher voltage, surface nonmetallic raceways are NOT approved where the voltage is ______ or more between conductors. 120 volts B. 150 volts C. 300 volts D. 250 volts A. Question Answer 72. C Reference NEC PG. # 388.12(3) 237 O 73. What is the MINIMUM permitted sill height of a transformer vault doorway? 2 inches B. 8 inches C. 6 inches D. 4 inches A. Question Answer 73. D Reference NEC PG. # 450.43(B) 354 O 74. PVC conduit used exposed in areas of physical damage shall be ________. Type Schedule 80 B. Type Schedule 40 C. Type Schedule 100 D. Prohibited A. Question Answer 74. A Reference NEC PG. # 352.10(F),IN 209 O 75. Determine the MAXIMUM setting permitted for the overload protection for a 7 ½ hp, 3-phase, 480 volt, induction-type ac motor with a full-load current of 15 amperes, an 86% power factor, and a service factor of 1.00 indicated on the nameplate. (Assume exceptions and modifications are not to be applied.) 17.25 amperes B. 12.65 amperes C. 18.75 amperes D. 13.75 amperes A. Question Answer 75. A Reference NEC PG. # 430.32(A)(1) 319 Nameplate rating of motor = 15 amperes x 1.15 = 17.25 amperes O 76. Where a portable generator is used for a portable optional standby source and is not considered a separately derived system, the equipment grounding conductor shall be bonded to ________. The generator frame and the grounded conductor B. The system grounding electrode C. A grounding conductor only D. The grounded conductor A. Question Answer 76. B Reference NEC PG. # 702.11(B) 631 O 77. Where track lighting installed in a continuous row, each individual section of NOT More than ______ in length shall be securely supported. 2 feet B. 4 feet C. 6 feet D. 8 feet A. Question Answer 77. B Reference NEC PG. # 410.154 289 O 78. A transformer is to be supplied with four (4) parallel size 500 kcmil conductors per phase. The conductors will enter the enclosure on the opposite wall of the terminals. What is the MINIMUM wirebending space required for the conductors? 10 inches B. 12 inches C. 14 inches D. 16 inches A. Question Answer 78. D Reference NEC PG. # 312.6(B)(2) Tbl.312.6(B) 174 176 O 79. For trade size ¾ in. Type MI cable, the radius of the inner edge of the bend shall NOT be less than _______ times the external diameter of the cable. Three B. Four C. Five D. Seven A. Question Answer 79. C Reference NEC PG. # 332.24(1) 195 O 80. Manhole covers shall be OVER ______ or otherwise require the use of tools to open. 25 lbs. B. 50 lbs. C. 75 lbs. D. 100 lbs. A. Question Answer 80. D Reference NEC PG. # 110.75(D) 45 O 81. Size 4/0 AWG, 75°C aluminum secondary conductors of a 3-phase, deltawye transformer, shall be protected at NOT more than _______. 175 amperes B. 200 amperes C. The calculated load connected to the transformer D. None of these, because secondary protection is not required for multiphase, delta-wye transformer secondary conductors. A. Question Answer 81. B Reference NEC PG. # Tbl. 310.15(B)(16) 240.4(B)(3) 240.6(A) 154 90 91 Size 4/0 AWG AL conductors rated @ 75º C ampacity = 180 amperes Next standard size OCP is rated 200 apmeres. *NOTE – Sec. 240.4(F) requires secondary OCP on delta – wye transformers. O 82. For the purpose of determining conductor fill in conduit, a flexible cord or cable of four (4) conductors shall be treated as ________ conductor(s). One B. Two C. Three D. Four A. Question Answer Reference NEC PG. # 82. A Note 9 Chpt. 9 Tbls. 711 O 83. Where the grounding electrode system of a building or structure consists of three (3) driven ground rods, the ground rods shall be spaced NOT less than ______ apart. 4 feet B. 5 feet C. 6 feet D. 8 feet A. Question Answer 83. C Reference NEC PG. # 250.53(B) 112 O 84. What is the MAXIMUM size overcurrent protection device required to protect size 14 AWG copper conductors used for a pump motor control-circuit that is protected by the motor branch circuit protection device and extends beyond the enclosure? 15 amperes B. 20 amperes C. 45 amperes D. 100 amperes A. Question Answer 84. C Reference NEC PG. # 430.72(B)(2) Tbl. 430.72(b) Col. C 326 327 O 85. What is the MAXIMUM number of size 12 AWG THHN conductors permitted to be installed in a trade size 3/8 in. flexible metal conduit (FMC) where the fittings are outside the FMC? Five B. Two C. Three D. Four A. Question Answer 85. D Reference NEC PG. # Tbl. 348.22 206 3 + 1 equipment grounding conductor = 4 conductors total O 86. A 120/240 volt, single-phase feeder of a retail shopping mall is to supply a noncontinuous load of 20,000 VA and a continuous load 16,000 VA. Consider the overcurrent device protecting the feeder conductors is not listed for operation at 100 percent of its rating and determine the MINIMUM size 75°C copper conductors required for this installation 1/0 AWG B. 2/0 AWG C. 3/0 AWG D. 1 AWG A. Question Answer 86. B Reference NEC PG. # 215.2(A)(1) 59 Single – Phase current formula Tbl. 310.15(B)(16) 154 20,000 VA x 100% = 20,000 VA 16,000 VA x 125% = 20,000 VA Total = 40,000 VA I = power I = 40,000 VA = 166.6 amperes volts 240 volts * NOTE – Size 2/0 AWG conductors with an allowable ampacity of 175 amperes should be selected. O 87. Apply the optional method of calculations for dwelling units and determine the demand load, in kW, on the ungrounded (line) service-entrance conductors for the electric ranges, where a 12 unit multifamily dwelling has an 8 kW range in each apartment. 39.36 kW B. 30.72 kW C. 27.00 kW D. 96.00 kW A. Question Answer 87. A Reference NEC PG. # 220.84(C)b. Tbl. 220.84 69 69 8 kW x 12 units = 96 kW (connected load) x 41% = 39.36 kW O 88. An indoor installed 100 kVA, dry-type transformer with a 4,160 volt primary, must have a clearance of at LEAST _______ from combustible material unless separated from the combustible material by a fire-resistant, heat-insulated barrier. 6 inches B. 8 inches C. 10 inches D. 12 inches A. Question Answer 88. D Reference NEC PG. # 450.21(A) 352 O 89. Interior metal water lines located NOT more than ____ from the point of entrance to the building shall be permitted to be used as a conductor to interconnect electrodes that are part of the grounding electrode system. 10 feet B. 8 feet C. 5 feet D. 20 feet A. Question Answer 89. C Reference NEC PG. # 250.68(C)(1) 116 O 90. The independent support wires used to support electrical metallic tubing (EMT) and flexible metal conduit (FMT) above a nonfire-rated ceiling shall be distinguishable from the ceiling support wires by means of ________. O I. Color O II. Tagging I only B. II only C. Either I or II D. Neither I nor II A. Question Answer 90. C Reference NEC PG. # 300.11(2) 141 O 91. Which of the following listed raceways is approved for use supplying wet-niche luminaires in a permanently installed swimming pool? Galvanized rigid metal conduit (RMC) B. Polyvinyl chloride conduit (PVC) C. Flexible nonmetallic conduit (FNC) D. All of these listed are approved. A. Question Answer 91. B Reference NEC PG. # 680.23(B)(2) 581 O 92. Power distribution blocks shall be permitted to be placed in pull and junction boxes having a volume over at LEAST _____ for connections of conductors installed in boxes where the power distribution blocks do not have uninsulated live parts exposed within the box, whether or not the box cover is installed. 30 cu. In. B. 60 cu. In. C. 75 cu. In. D. 100 cu. In. A. Question Answer 92. D Reference NEC PG. # 314.28(E)(2) 184 O 93. The circuit disconnecting means for non- power-limited fire alarm (NPLFA) circuits shall have ______ colored identification, shall be accessible only to qualified persons and shall be identified as “FIRE ALARM CIRCUIT.” Red B. Orange C. Yellow D. Blue A. Question Answer 93. A Reference NEC PG. # 760.41(B) 652 O 94. A flexible metal conduit (FMC) having a length of 4 ft. is to supply a panelboard from a transformer. The FMC will contain three (3) size 400 kcmil THWN copper conductors and one (1) size 350 kcmil THWN copper conductor. In compliance with the NEC®, what is the MINIMUM trade size FMC required. 2 ½ in. B. 3 in. C. 3 ½ in. D. 4 in. A. Question Answer 94. C Reference NEC PG. # Annex C, Tbl. C.3 755 O 95. An outside overhead span of 3-phase, 4 wire, 480Y/277 volt conductors are to be installed between two buildings of a college campus. The area the conductors cross will not be subject to truck traffic. The conductors must have a MINIMUM clearance of ______ from final grade. 10 feet B. 12 feet C. 15 feet D. 18 feet A. Question Answer 95. B Reference NEC PG. # 225.18(2) 72 O 96. Cables over 600 volts and those rated 600 volts or less, are permitted to be installed in a common cable tray without a fixed barrier, where the cables over 600 volts are _______. Type MI B. Type NM C. Type CT D. Type MC A. Question Answer 96. D Reference NEC PG. # 392.20(B)(1) 241 O 97. When calculating the total load for a mobile home park before demand factors are taken into consideration, each individual mobile home lot shall be calculated at a MINIMUM of _________. 15,000 VA B. 16,000 VA C. 20,000 VA D. 24,000 VA A. Question Answer 97. B Reference NEC PG. # 550.31(1) 489 O 98. Where a restaurant located in a retail shopping mall has a main circuit breaker rated for 400 amperes, the required bonding jumper to the metal water piping system is to be at LEAST _______ copper. 6 AWG B. 2 AWG C. 3 AWG D. 4 AWG A. Question Answer 98. C Reference NEC PG. # 250.104(A)(2) Tbl. 250.122 119 125 O 99. In general, on the load side of the point of grounding of a separately derived system such as a transformer, a grounded conductor is NOT permitted to be connected to ________. Equipment grounding conductors B. Normally non-current-carrying metal parts of equipment C. The system bonding jumper D. Any of these A. Question Answer 99. D Reference NEC PG. # 250.30(A) 106 O 100. Where one or more receptacle outlets are provided for the show window lighting in a retail store, the outlet(s) shall be installed within at LEAST ________ of the top of the show window. 12 inches B. 18 inches C. 24 inches D. 30 inches A. Question Answer 100. B Reference NEC PG. # 210.62 58 Click here to advance to the non-timed drill O 1. After all demand factors have been taken into consideration for an office building, the demand load is determined to be 90,000 VA. Where the building has a 120/240 volt, single-phase electrical system, what MINIMUM size copper conductors with THHW insulation are required for the underground service-lateral conductors? 400 kcmil B. 350 kcmil C. 300 kcmil D. 500 kcmil A. Question Answer 1. D Reference NEC PG. # Tbl. 310.15(B)(16) Single –phase current 154 Formula I= Power Volts I = 90,000VA = 375 amperes 240 volts *Note – Size 500 kcmil THHW conductors with an allowable ampacity of 380 amperes should be selected. O 2. A commercial building is to be supplied with a transformer having a 480Y/277 volt, 3-phase primary and a 208Y/120 volt, 3phase secondary. The secondary will have a balanced computed demand load of 416 amperes per phase. The transformer is required to have a MINIMUM kVA rating of _______. 100 kVA B. 150 kVA C. 86 kVA D. 200 kVA A. Question Answer 2. B Reference NEC PG. # 3 – phase power Formula VA = I x E x 1.732 O VA = 416 amperes x 208 volts x 1.732 O 149,866 VA ÷ 1,000 = 149.8 kVA O 3. What is the MINIMUM size equipment bonding jumper allowed for receptacles connected to a 20-ampere branch circuit in a critical care area of a hospital? 8 AWG B. 10 AWG C. 12 AWG D. 14 AWG A. Question Answer 3. B Reference NEC PG. # 517.19(C) 444 O 4. The branch circuit conductors supplying one or more units of information technology equipment shall have an ampacity of NOT less than ________ of the connected load. 80 percent B. 100 percent C. 115 percent D. 125 percent A. Question Answer 4. D Reference NEC PG. # 645.5 (A) 561 O 5. In Class II, Division I hazardous locations, an approved method of connection of conduit boxes is __________. Compression fittings B. Threaded bosses C. Welding D. All of these A. Question Answer 5. B Reference NEC PG. # 502.10(A)(1)(4) 386 O 6. Where a motor of more than 1 horsepower has a temperature rise of 50°C indicated on the nameplate, for the purpose of selecting the overload device, this device shall be selected to trip at NO more than ________ of the motor’s full-load ampere rating. (No exceptions or modifications permitted.) 100 percent B. 115 percent C. 125 percent D. 130 percent A. Question Answer 6. B Reference NEC PG. # 430.32(A)(1) 319 O 7. The MINIMUM burial depth for conduit or cables installed under an airport runway, concourse or tarmac is ______. 1 ½ feet B. 2 feet C. 3 feet D. 1 foot A. Question Answer 7. A Reference NEC PG. # Tbl. 300.5 138 O 8. Liquidtight flexible metal conduit (LFMC) is approved for use as an equipment grounding conductor if it does NOT exceed _______ in length. 10 feet B. 12 feet C. 6 feet D. 8 feet A. Question Answer 8. C Reference NEC PG. # 250.118(6)d. 122 O 9. Conductors supplying more than one (1) motor shall have an ampacity of NOT less than ______ of the full-load current rating of the largest motor in the group and 100% of the full-load current ratings of all the other motors in the group. 125 percent B. 110 percent C. 150 percent D. 175 percent A. Question Answer 9. A Reference NEC PG. # 430.24(1)&(2) 318 O 10. Determine the MINIMUM size THWN copper branch-circuit conductors permitted to supply an ac motor when given the following related information: All terminations are rated for 75°C Nameplate current rating is 25 amperes 15 minute rated motor Short-time duty 12 AWG B. 10 AWG C. 8 AWG D. 6 AWG A. Question Answer 10. B Reference NEC PG. # 430.22(E) Tbl. 430.22(E) Tbl.310.15(B)(16) 316 317 154 FLC of motor = 25 amperes x 120% = 30 amperes * NOTE – Size 10 AWG THWN copper conductors with an allowable ampacity of the 35 amperes should be selected O 11. When intermediate metal conduit (IMC) is threaded in the field, a standard cutting die with a ________ taper per ft. shall be used. 3/8 in. B. 1/2 in. C. 3/4 in. D. 1 in. A. Question Answer 11. C Reference NEC PG. # 342.28 202 O 12. Apply no exceptions and determine the MAXIMUM standard size nontime-delay fuse permitted for branch-circuit, short-circuit, and ground-fault protection for an ac motor where given the following related information: 2 hp – 120 volts, single-phase Continuous-duty Nameplate current rating – 22 amperes No code letter 70 amperes B. 80 amperes A. C. 85 amperes D. 90 amperes Question Answer 12. A Reference NEC PG. # 430.6(A)(1) Tbl. 430.248 240.6(A) 311 337 91 FLC of motor - 24 amperes x 300% = 72 amperes * NOTE - In this case you must go down to the next standard size nontime - delay fuse with an ampere rating of 70 amperes O 13. Which of the following listed is NOT permitted for sues as both controller and disconnecting means for a motor? Inverse time circuit breaker B. Instantaneous-trip circuit breaker C. Oil switch D. Air-break switch A. Question Answer 13. B Reference NEC PG. # 430.111(B)(1),(2)&(3) 332 O 14. Under which, if any, of the following conditions is the neutral conductor to be counted as a current-carrying conductor? O I. When it is only carrying the unbalanced current of a single-phase system O II. When it is the neutral of a 3-phase wyeconnected system that consists of nonlinear loads. I only B. II only C. Neither I nor II D. Both I and II A. Question Answer 14. B Reference NEC PG. # 310.15(B)(5)(a)&(c) 152 O 15. Ceiling-suspended luminaires or paddle fans located ______ or more above the maximum water level of a spa or hot tub shall NOT require GFCI protection. 10 feet B. 7 ½ feet C. 8 feet D. 12 feet A. Question Answer 15. D Reference NEC PG. # 680.43(B)(1)(a) 587 O 16. A junction box to be installed will contain the following: Three – size 6 AWG ungrounded conductors Three – size 6 AWG grounded conductors One – size 8 AWG equipment grounding conductor Three – size 12 AWG ungrounded conductors Three – size 12 AWG grounded conductors One – size 12 equipment grounding conductor Four – internal clamps O The junction box is required to have a volume of at LEAST _______. A. B. 51.50 cubic inches 53.75 cubic inches C. 46.50 cubic inches D. 56.50 cubic inches Question Answer 16. A Reference NEC PG. # Tbl. 314.16(B) 314.16(B)(1)&(2) 179 178 Size 6 AWG ungrounded conductors 3 x 5.00 cu. In. = 15.00 cu.in. Size 6 AWG grounded conductors 3 x 5.00 cu. In. = 15.00 cu.in. Size 8 AWG grounding conductors 1 x 3.00 cu.in. = 3.00 cu.in. Size 12 AWG ungrounded conductors 3 x 2.25 cu.in. = 6.75 cu.in. Size 12 AWG grounded conductors 3 x 2.25 cu.in. = 6.75 cu.in. Size 12 AWG grounding conductors Internal clamps -0- 1 x 5.00 cu.in. = Total = 5.00 cu.in. 51.50 cu.in. O 17. Where conductors of size 4 AWG or larger are installed in conduits entering a junction box and straight pulls of the conductors are to be made, the length of the box shall NOT be less than _______ times the trade of the largest raceway. Six B. Eight C. Ten D. Twelve A. Question Answer 17. B Reference NEC PG. # 314.28(A)(1) 183 O 18. With respect to service-drop conductors and open overhead wiring of not more than 750 volts to ground, the MINIMUM vertical clearance that must be maintained from the base of a swimming pool diving board and the conductors is _________. 14 ½ feet B. 16 ½ feet C. 20 ½ feet D. 22 ½ feet A. Question Answer 18. D Reference NEC PG. # 680.8(A) Fig. 680.8 Tbl. 680.8 577 578 578 O 19. The life safety branch of the emergency system of a health care facility shall provide power to ______. O I. automatic doors used for building egress O II. Illuminate electrical equipment I only B. II only C. Both I and II D. Neither I nor II A. Question Answer 19. A Reference NEC PG. # 517.32(H) 448 O 20. When a building contains _______, the building may have more than one service without special permission being granted from the local authority having jurisdiction. Exit lights B. Fire pumps C. Computers D. Four-hour rated fire-resistant walls A. Question Answer 20. B Reference NEC PG. # 230.2(A)(1) 78 O 21. In general, service-drop conductors shall have a vertical clearance of at LEAST _______ above the roof surface of a building having no overhang. 10 feet B. 12 feet C. 14 feet D. 8 feet A. Question Answer 21. D Reference NEC PG. # 230.24(A) 80 O 22. In general, the phase arrangement on the three-phase busses for a three-phase panelboard or switchboard shall be A, B, C, as viewed from __________. O I. Back to front O II. Bottom to top I only B. II only C. Neither I nor II D. Both I and II A. Question Answer 22. C Reference NEC PG. # 408.3(E) 274 O 23. Where a conductor is marked RHW-2 on the insulation what does the -2 represent? The cable has 2 conductors. B. The conductor is double insulated C. The conductor has a nylon outer jacket D. The conductor has a maximum operating temperature of 90°C A. Question Answer 23. (D) Reference NEC PG. # Tbl. 310.104(A) 168 O 24. Which of the following listed raceways is NOT permitted for use of enclosing control wiring for electric motor-driven fire pumps? Flexible metal conduit (FMC) B. Liquidtight flexible metal conduit (LFMC) C. Liquidtight flexible nonmetallic conduit (LFNC) D. Intermediate metal conduit (IMC) A. Question Answer 24. A Reference NEC PG. # 695.14(E) 620 O 25. In a hospital, low-voltage equipment that is frequently in contact with the bodies of persons, must operate on a voltage of _____ or less or be moisture resistant, double insulated or approved as intrinsically safe. 10 volts B. 24 volts C. 50 volts D. 120 volts A. Question Answer Reference NEC PG. # 25. A 517.65(A)(1),(2)&(3) 455 O 26. A grounding electrode that is the sole connection to the made grounding electrode, shall NOT be required to be larger than size _____ copper conductor. 1/0 AWG B. 6 AWG C. 4 AWG D. 3/0 AWG A. Question Answer 26. B Reference NEC PG. # 250.66(A) 115 O 27. For solar photovoltaic systems, locating the system grounded connection point as close as practicable to the photovoltaic source better protects the system from _________. Excessive voltage drop B. Excessive resistance in the grounding system C. Voltage surges due to the lighting D. Voltage surges due to ground-faults A. Question Answer 27. C Reference NEC PG. # 690.42,IN 603 O 28, Transformers containing oil or a liquid that will burn where located in Class I, Division 1 locations shall be _______. Enclosed in a fence B. Installed in vaults only C. Identified for Class I locations D. Installed in a fire-resistant room A. Question Answer 28. B Reference NEC PG. # 501.100(A)(1) 381 O 29. Where liquidtight flexible metal conduit (LFMC) is installed in a Class I, Division 2 hazardous location, it shall be permitted to delete the bonding jumper, where the LFMC is NOT longer than _______ and the overcurrent protection in the circuit is limited to _______ or LESS and the load is not a power utilization load. 6 feet – 20 amperes B. 10 feet – 10 amperes C. 6 feet – 10 amperes D. 6 feet – 15 amperes A. Question Answer 29. C Reference NEC PG. # 501.30(B),Ex.(1)&2 381 O 30. Which one of the following wiring methods is permitted to be installed in ducts specifically fabricated for environmental air? Rigid polyvinyl chloride conduit (PVC) B. Electrical metallic tubing (EMT) C. Armored Cable (AC) D. Nonmetallic sheathed cable (NM) A. Question Answer 30. B Reference NEC PG. # 300.22(B) 144 O 31. An adjustable overload protection device protecting a single phase, 240-volt, continuous-duty, 5 hp, ac motor with a FLA rating of 26 amperes and a temperature rise of 50°C marked on the nameplate, shall be selected to trip at NOT more than ______. (Consider the value you select will enable the motor to start without tripping and modification of this value is not necessary) 29.9 amperes B. 32.2 amperes C. 33.8 amperes D. 36.4 amperes A. Question Answer 31. A Reference NEC PG. # 430.6(A)(2) Tbl.430.248 430.32(A)(1) 312 337 319 FLA of motor = 26 amperes x 115% = 29.9 amperes O 32. In Class II, Division 1 locations, where pendant mounted luminaires are suspended by rigid metal conduit (RMC) and a means for flexibility is not provided, the RMC shall have a length of NOT more than ________. 12 inches B. 18 inches C. 24 inches D. 30 inches A. Question Answer 32. A Reference NEC PG. # 502.130(B)(4) 390 O 33. A commercial kitchen is to have the following cooking related equipment installed: One – 14 kW range One – 5.0 kW water heater One – 0.75 kW mixer One – 2.5 kW dishwasher One – 2.0 kW booster heater One – 2.0 kW broiler O Determine the demand load, in kW, after applying the demand factors for the kitchen equipment. 19.00 kW B. 26.25 kW A. C. 18.38 kW D. 17.06 kW Question Answer 33. A Reference NEC PG. # 220.56 Tbl.220.56 65 67 14.00 kw – range 5.00 kw - water heater 0.75 kw – mixer 2.50 kw – dishwasher 2.00 kw – booster heater 2.00 kw – broiler 26.25 kw – total connected load x 65% = 17.06 • • NOTE – However the NEC ® states the demand shall not be less than the two largest pieces of equipment. 14.00 kw + 5.00 kw = 19 kw demand O 34. In a minor repair commercial garage, any unventilated pit or below-grade work area is classified as a _______ hazardous location, where gaseous liquids and fuels are not transferred. Class I, Division 2 B. Class II, Division 1 C. Class II, Division 2 D. Class I, Division 1 A. Question Answer 34. A Reference NEC PG. # 511.3(D)(3)(b) 421 O 35. Where a motor controller enclosure is located outdoors and is subject to be exposed to sleet, it shall have a MINIMUM rating of _______, where the controller mechanism is required to be operable when ice covered. Type 3 B. Type 3S C. Type 3R D. Type 3SX A. Question Answer 35. B Reference NEC PG. # Tbl. 110.28 41 O 36. When buried raceways pass under a commercial driveway or parking lot the MINIMUM cover requirements ______. Decrease if installed in rigid metal conduit (RMC) B. Do not change in regard to wiring methods used C. Shall be increased for direct-buried cables D. Shall be increased, decreased or remain the same, depending on the wiring method used A. Question Answer 36. B Reference NEC PG. # Tbl. 300.5 138 O 37. The National Electrical Code® requires ventilation of a battery room where batteries are being charged to prevent ___________. Battery corrosion B. Electrostatic charge C. Deterioration of the building steel D. An accumulation of an explosive mixture A. Question Answer 37. D Reference NEC PG. # 480.9(A) 360 O 38. For other than Design B energy-efficient motors, where the setting specified in Table 430.52 of the NEC® is not sufficient for the starting current of the motor, the setting of an instantaneous trip circuit breaker shall be permitted to be increase3d, but in NO case exceed ________ of the full-load current of the motor. 1300 percent B. 1700 percent C. 1100 percent D. 800 percent A. Question Answer 38. A Reference NEC PG. # 430.52(C)(3), Ex.1 323 O 39. Where given the following related information, determine the MAXIMUM standard size overcurrent protection required for the primary and secondary side of a transformer, when primary and secondary overcurrent protection is to be provided. 150 kVA rating Primary – 480 volt, 3-phase, 3-wire Secondary – 208Y/120 volt, 3-phase, 4- wire A. B. C. D. Primary – 500 amperes, Secondary – 500 amperes Primary – 450 amperes, Secondary – 600 amperes Primary – 500 amperes, Secondary – 450 amperes Primary – 450 amperes, Secondary – 500 amperes Question Answer 39. B Reference NEC PG. # 3 – Phase Current Formula 450.3(B) Tbl. 450.3(B) 240.6(A) 348 349 91 (Primary) I= VA___ I = __150,000__ = 150,000 = 180 amps x 250% = 450 amps E x 1.732 480 x 1.732 831.36 (Secondary ) I= VA___ I = __150,000__ = 150,000 = 416 amps x 250% = 520 amps E x 1.732 208 x 1.732 36.25 O 40. For capacitors of over 600 volts, a means shall be provided to reduce the residual voltage of a capacitor to ________ after the capacitor is disconnected from the source of supply. 50 volts or less within 1 minute B. 24 volts or less within 1 minute C. 50 volts or less within 10 minutes D. 50 volts or less within 5 minutes A. Question Answer 40. D Reference NEC PG. # 460.28(A) 358 O 41. Apply no exceptions and determine the MAXIMUM standard size time-delay fuses permitted to be used for branch-circuit, short-circuit, and ground-fault protection for a 15 hp, 480-volt, three-phase, continuousduty, wound rotor motor. 35 amperes B. 40 amperes C. 50 amperes D. 55 amperes A. Question Answer 41. A Reference NEC PG. # 430.6(A)(1) Tbl. 430.250 Tbl. 430.52 240.6(A) 311 338 323 91 FLC of motor = 21 amperes x 175% = 36.75 amperes * NOTE – In this situation you are required to go DOWN to the next standard size fuses with a rating of 35 amperes O 42. In general, when conductors of different insulation rating are installed in a common raceway and the voltage is 600 colts or less, the NEC® requires __________. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor on the raceway B. The conduit allowable fill to be limited to 31 percent C. All conductors within the raceway shall have a temperature rating of 75°C D. The insulation of the lower rated conductors to be identified with blue or yellow colors. A. Question Answer 42. A Reference NEC PG. # 300.3(C)(1) 136 O 43. Where used outdoors, aluminum grounding conductors shall NOT be terminated within _____ of the earth. 18 inches B. 24 inches C. 3 feet D. 6 feet A. Question Answer 43. A Reference NEC PG. # 250.64(A) 113 O 44. A 6,000 sq. ft. bank building is to be constructed and the number of generalpurpose receptacles to be installed in the building is yet to be determined; the building will also have an electric sign. Determine the MINIMUM number of 120-volt, 20-ampere branch circuits required for the lighting, receptacles and the sign. 12 B. 13 C. 14 D. 15 A. Question Answer 44. D Reference NEC PG. # Art. 100 210.19(A)(1) Tbl. 220.12 600.5(A) 27 52 63 519 6000 sq. ft. x 3.5 VA = 21,000 VA x 125% = 26,250 VA (lighting ) 6000 sq. ft. x 1.0 VA = 6,000 VA (receptacles) 32,250 VA ( recpts. & ltg.) 120 volts x 20 amperes = 2,400 VA of one circuit 32,250 VA (load)/2,400 VA (one circuit) = 13.4 ckts. = 14 circuits 14 circuits ( lighting & receptacles) + 1 sign circuit = 15 circuits total O 45. Enclosures containing circuit breakers, switches and motor controllers located in Class II, Division 2 locations, shall be ______ or otherwise identified for the location. Gastight B. Vapor-proof C. Dust tight D. Stainless steel A. Question Answer 45. C Reference NEC PG. # 502.115(B) 388 O 46. Where installed for a commercial occupancy, determine the MINIMUM size THWN copper conductors required from the terminals of a 3-phase, 480Y/277 volt, 4wire, 200 kW generator to the first distribution device(s) containing overcurrent protection, where the design and operation of the generator does NOT prevent overloading. 250 kcmil B. 300 kcmil C. 400 kcmil D. 500 kcmil A. Question Answer 46. B Reference NEC PG. # 3 – Phase current Formula 455.13 Tbl. 310.15(B)(16) 347 154 I = kW x 1,000 I = 200 x 1,000 = 200,00 = 240.56 amperes (FLC) volts x 1.732 480 x 1.732 831.36 241 amperes x 115% = 277 amperes (required ampacity of conductors) *NOTE – Size 300 kcmil THWN conductors with an allowable ampacity of 285 amperes should be selected. O 47. Where required, conduit seals installed in Class I Divisions 1 & 2 locations shall have the minimum thickness of the sealing compound not less than the trade size of the sealing fitting and, in NO case less than _______ thick. 1/2 in. B. 5/8 in. C. 3/4 in. D. 1 in. A. Question Answer 47. B Reference NEC PG. # 501.15(C)(3) 379 O 48. A dwelling unit to be built will have 1,400 sq. ft. of livable space on the main floor, a 1,400 sq. ft. basement (unfinished but adaptable for future use), a 200 sq. ft. open porch and a 600 sq. ft. garage. Determine the MINIMUM number of 15ampere, 120-volt general lighting branchcircuits required for the dwelling. Four B. Five C. Six D. Seven A. Question Answer 48. B Reference NEC PG. # 220.12 Tbl. 220.12 61 63 1,400 sq. ft. + 1,400 sq. ft. = 2,880sq. Ft. x VA = 8,400 VA 120 volts x 15 amperes = 1,800 VA of one circuit 8,400 VA (load) 4.6 = 5 circuits total 1,800 VA ( one circuit) O 49. The optional method of feeder and service load calculations for dwelling units is reserved for feeder and service conductors with a MINIMUM ampacity of ________ or greater. 400 amperes B. 200 amperes C. 150 amperes D. 100 amperes A. Question Answer 49. D Reference NEC PG. # 220.82(A) 67 O 50. In an industrial establishment, what is the MAXIMUM length of 200 ampere rated busway that may be tapped to a 600 ampere rated busway, without additional overcurrent protection? 10 feet B. 25 feet C. 50 feet D. 75 feet A. Question Answer 50. C Reference NEC PG. # 368.17(B),Ex. 225 O 51. Thermal insulation is not permitted to be installed above a recessed luminaire or WITHIN _____ of the recessed luminaire’s enclosure, wiring compartment, ballast, transformer, LED driver or power supply, unless the luminaire is identified as Type IC for insulation contact. 3 inches B. 4 inches C. 6 inches D. 8 inches A. Question Answer 51. A Reference NEC PG. # 410.116(B) 286 O 52. What is the MINIMUM height allowed for a fence enclosing an outdoor installation of 2,400 volt electrical equipment? 6 feet B. 7 feet C. 8 feet D. 9 feet A. Question Answer 52. B Reference NEC PG. # 110.31 40 O 53. All exposed non-current-carrying metal parts of an information technology system shall ______ or shall be double insulated. Be bonded to the equipment grounding conductor B. Not be bonded to the equipment grounding conductor C. Be bonded to the grounded conductor D. Be isolated A. Question Answer 53. A Reference NEC PG. # 645.15 562 O 54. Storage batteries used as a source of power for emergency systems shall be of a suitable rating and capacity to supply and maintain the total load for at LEAST________. 1/2 hour B. 1 hour C. 1 ½ hour D. 2 hours A. Question Answer 54. C Reference NEC PG. # 700.12(A) 624 O 55. Circuit breakers rated at _____ or less and 600 volts or less shall have the ampere rating molded, stamped, etched or similarly marked into their handles or escutcheon areas. 600 amperes B. 200 amperes C. 400 amperes D. 100 amperes A. Question Answer 55. D Reference NEC PG. # 240.83(B) 96 O 56. What percent of electrical supplied spaces in a recreational vehicle park must be equipped with at least one (1) 30-ampere 125-volt receptacle outlet? 75 percent B. 60 percent C. 70 percent D. 100 percent A. Question Answer 56. C Reference NEC PG. # 551.71 500 O 57. A straight pull of size 250 kcmil and 350 kcmil conductors is to be made in a junction box that will have one (1) 3 in. conduit and two (2) 2 ½ in. conduits entering on the same side and exiting on the opposite wall. No splices or terminations will be made in the box. Which of the following listed junction boxes is the MINIMUM required for this installation? 18 in. x 12 in. B. 20 in. x 18 in. C. 20 in. x 20 in. D. 24 in. x 24 in. A. Question Answer 57. D Reference NEC PG. # 314.28(A)(1) 183 3 in. (largest conduit) x 8 = 24 in. O 58. Where conduits enter a floor-standing switchboard or panelboard at the bottom, the conduits, including their end fittings, shall NOT rise more than _______ above the bottom of the enclosure. 6 inches B. 3 inches C. 2 inches D. 4 inches A. Question Answer 58. B Reference NEC PG. # 408.5 275 O 59. A bonding jumper connected between the communications grounding electrode and power grounding electrode system at the building or structure service where separate electrodes are used shall NOT be smaller than ______ copper. 8 AWG B. 6 AWG C. 12 AWG D. 10 AWG A. Question Answer 59. B Reference NEC PG. # 800.100(D) 674 O 60. Which of the following listed copper conductors, is the MINIMUM size 75°C rated conductors required to supply a continuous-duty, 25 hp, 208-volt, 3-phase motor, where the motor is on the end of a short conduit run that contains only three (3) conductors, at an ambient temperature of 115°F? 1 AWG THWN B. 2 AWG THWN C. 1 AWG THHN D. 1/0 AWG THWN A. Question Answer Reference NEC PG. # 60. A 430.22 Tbl. 430.250 Tbl. 310.15(B)(16)(a) Tbl. 310.15(B)(16) 316 338 150 154 25 hp motor FLC = 74.8 amperes x 125% = 93.5 amperes 93.5 amperes ÷ .75 (temperature correction) = 124.6 amperes * NOTE – The wire size needs to be increased because of the elevated ambient temperature. Size 1 AWG THWN conductors with allowable ampacity of 130 amperes should be selected O 61. Single-conductor cable Type ______ shall be permitted in exposed outdoor locations in photovoltaic source circuits for photovoltaic module interconnections within the photovoltaic array. UF B. THHN C. USE-2 D. THWN A. Question Answer 61. C Reference NEC PG. # 690.31(B) 601 O 62. For track lighting installed in a retail store, a MAXIMUM of two (2) feet of lighting track or fraction thereof shall be considered ______. 150 VA B. 180 VA C. 200 VA D. 100 VA A. Question Answer 62. A Reference NEC PG. # 220.43(B) 64 O 63. Where fixed wiring above bulk fuel storage tanks is installed in PVC conduit, the PVC shall be Schedule ________. 20 B. 40 C. 80 D. 100 A. Question Answer 63. C Reference NEC PG. # 515.7(A) 429 O 64. Disregarding exceptions, the MINIMUM size grounded or undergrounded conductors permitted to be connected in parallel is _____. 6 AWG B. 1 AWG C. 2 AWG D. 1/0 AWG A. Question Answer 64. D Reference NEC PG. # 310.10(H)(1) 429 O 65. In general, 4 in. wide underfloor raceways shall have a covering of wood or concrete of NOT less than _______ above the raceway. ½ in. B. ¾ in. C. 1 in. D. 1 ¼ in. A. Question Answer 65. B Reference NEC PG. # 390.4(A) 238 O 66. Exposed trade size ¾ in. Schedule 40 PVC conduit is required to be securely supported at intervals NOT to exceed _______. 3 feet B. 4 feet C. 6 feet D. 8 feet A. Question Answer 66. A Reference NEC PG. # 352.30(B) Tbl. 352.30 209 210 O 67. Receptacles located within the patient care areas of pediatric wards shall be ______ or shall employ a listed tamperresistant cover. 15 ampere rated B. Provided with GFCI C. A single receptacle type D. Listed tamper-resistant A. Question Answer 67. D Reference NEC PG. # 517.18(C) 444 O 68. What is the MAXIMUM length permitted of a flexible cord that may be used to cordand-plug connect a water circulating pump motor for a swimming pool at a dwelling? 3 feet B. 4 feet C. 6 feet D. 10 feet A. Question Answer 68. A Reference NEC PG. # 680.21(A)(5) 579 O 69. The MAXIMUM height above the floor or working platform to the center of the operating handle of a service disconnecting switch when it is in the ON position must not exceed ______. 6 feet B. 6 ft. 6 in. C. 6 ft. 7 in. D. 7 feet A. Question Answer 69. C Reference NEC PG. # 404.8(A) 267 & 268 O 70. The upward discharging vent of an underground fuel tank of motor fuel dispensing facilities is classified as a Class I, Division 1 location WITHIN ______ of the open vent. 3 feet B. 5 feet C. 6 feet D. 8 feet A. Question Answer 70. B Reference NEC PG. # Tbl. 514.3(B)(1) 427 O 71. Flexible metallic tubing (FMT) shall NOT be used in lengths exceeding _______. 5 feet B. 6 feet C. 8 feet D. 10 feet A. Question Answer 71. B Reference NEC PG. # 360.12(6) 219 O 72. Unless approved for a higher voltage, surface nonmetallic raceways are NOT approved where the voltage is ______ or more between conductors. 120 volts B. 150 volts C. 300 volts D. 250 volts A. Question Answer 72. C Reference NEC PG. # 388.12(3) 237 O 73. What is the MINIMUM permitted sill height of a transformer vault doorway? 2 inches B. 8 inches C. 6 inches D. 4 inches A. Question Answer 73. D Reference NEC PG. # 450.43(B) 354 O 74. PVC conduit used exposed in areas of physical damage shall be ________. Type Schedule 80 B. Type Schedule 40 C. Type Schedule 100 D. Prohibited A. Question Answer 74. A Reference NEC PG. # 352.10(F),IN 209 O 75. Determine the MAXIMUM setting permitted for the overload protection for a 7 ½ hp, 3-phase, 480 volt, induction-type ac motor with a full-load current of 15 amperes, an 86% power factor, and a service factor of 1.00 indicated on the nameplate. (Assume exceptions and modifications are not to be applied.) 17.25 amperes B. 12.65 amperes C. 18.75 amperes D. 13.75 amperes A. Question Answer 75. A Reference NEC PG. # 430.32(A)(1) 319 Nameplate rating of motor = 15 amperes x 1.15 = 17.25 amperes O 76. Where a portable generator is used for a portable optional standby source and is not considered a separately derived system, the equipment grounding conductor shall be bonded to ________. The generator frame and the grounded conductor B. The system grounding electrode C. A grounding conductor only D. The grounded conductor A. Question Answer 76. B Reference NEC PG. # 702.11(B) 631 O 77. Where track lighting installed in a continuous row, each individual section of NOT More than ______ in length shall be securely supported. 2 feet B. 4 feet C. 6 feet D. 8 feet A. Question Answer 77. B Reference NEC PG. # 410.154 289 O 78. A transformer is to be supplied with four (4) parallel size 500 kcmil conductors per phase. The conductors will enter the enclosure on the opposite wall of the terminals. What is the MINIMUM wirebending space required for the conductors? 10 inches B. 12 inches C. 14 inches D. 16 inches A. Question Answer 78. D Reference NEC PG. # 312.6(B)(2) Tbl.312.6(B) 174 176 O 79. For trade size ¾ in. Type MI cable, the radius of the inner edge of the bend shall NOT be less than _______ times the external diameter of the cable. Three B. Four C. Five D. Seven A. Question Answer 79. C Reference NEC PG. # 332.24(1) 195 O 80. Manhole covers shall be OVER ______ or otherwise require the use of tools to open. 25 lbs. B. 50 lbs. C. 75 lbs. D. 100 lbs. A. Question Answer 80. D Reference NEC PG. # 110.75(D) 45 O 81. Size 4/0 AWG, 75°C aluminum secondary conductors of a 3-phase, deltawye transformer, shall be protected at NOT more than _______. 175 amperes B. 200 amperes C. The calculated load connected to the transformer D. None of these, because secondary protection is not required for multiphase, delta-wye transformer secondary conductors. A. Question Answer 81. B Reference NEC PG. # Tbl. 310.15(B)(16) 240.4(B)(3) 240.6(A) 154 90 91 Size 4/0 AWG AL conductors rated @ 75º C ampacity = 180 amperes Next standard size OCP is rated 200 apmeres. *NOTE – Sec. 240.4(F) requires secondary OCP on delta – wye transformers. O 82. For the purpose of determining conductor fill in conduit, a flexible cord or cable of four (4) conductors shall be treated as ________ conductor(s). One B. Two C. Three D. Four A. Question Answer Reference NEC PG. # 82. A Note 9 Chpt. 9 Tbls. 711 O 83. Where the grounding electrode system of a building or structure consists of three (3) driven ground rods, the ground rods shall be spaced NOT less than ______ apart. 4 feet B. 5 feet C. 6 feet D. 8 feet A. Question Answer 83. C Reference NEC PG. # 250.53(B) 112 O 84. What is the MAXIMUM size overcurrent protection device required to protect size 14 AWG copper conductors used for a pump motor control-circuit that is protected by the motor branch circuit protection device and extends beyond the enclosure? 15 amperes B. 20 amperes C. 45 amperes D. 100 amperes A. Question Answer 84. C Reference NEC PG. # 430.72(B)(2) Tbl. 430.72(b) Col. C 326 327 O 85. What is the MAXIMUM number of size 12 AWG THHN conductors permitted to be installed in a trade size 3/8 in. flexible metal conduit (FMC) where the fittings are outside the FMC? Five B. Two C. Three D. Four A. Question Answer 85. D Reference NEC PG. # Tbl. 348.22 206 3 + 1 equipment grounding conductor = 4 conductors total O 86. A 120/240 volt, single-phase feeder of a retail shopping mall is to supply a noncontinuous load of 20,000 VA and a continuous load 16,000 VA. Consider the overcurrent device protecting the feeder conductors is not listed for operation at 100 percent of its rating and determine the MINIMUM size 75°C copper conductors required for this installation 1/0 AWG B. 2/0 AWG C. 3/0 AWG D. 1 AWG A. Question Answer 86. B Reference NEC PG. # 215.2(A)(1) 59 Single – Phase current formula Tbl. 310.15(B)(16) 154 20,000 VA x 100% = 20,000 VA 16,000 VA x 125% = 20,000 VA Total = 40,000 VA I = power I = 40,000 VA = 166.6 amperes volts 240 volts * NOTE – Size 2/0 AWG conductors with an allowable ampacity of 175 amperes should be selected. O 87. Apply the optional method of calculations for dwelling units and determine the demand load, in kW, on the ungrounded (line) service-entrance conductors for the electric ranges, where a 12 unit multifamily dwelling has an 8 kW range in each apartment. 39.36 kW B. 30.72 kW C. 27.00 kW D. 96.00 kW A. Question Answer 87. A Reference NEC PG. # 220.84(C)b. Tbl. 220.84 69 69 8 kW x 12 units = 96 kW (connected load) x 41% = 39.36 kW O 88. An indoor installed 100 kVA, dry-type transformer with a 4,160 volt primary, must have a clearance of at LEAST _______ from combustible material unless separated from the combustible material by a fire-resistant, heat-insulated barrier. 6 inches B. 8 inches C. 10 inches D. 12 inches A. Question Answer 88. D Reference NEC PG. # 450.21(A) 352 O 89. Interior metal water lines located NOT more than ____ from the point of entrance to the building shall be permitted to be used as a conductor to interconnect electrodes that are part of the grounding electrode system. 10 feet B. 8 feet C. 5 feet D. 20 feet A. Question Answer 89. C Reference NEC PG. # 250.68(C)(1) 116 O 90. The independent support wires used to support electrical metallic tubing (EMT) and flexible metal conduit (FMT) above a nonfire-rated ceiling shall be distinguishable from the ceiling support wires by means of ________. O I. Color O II. Tagging I only B. II only C. Either I or II D. Neither I nor II A. Question Answer 90. C Reference NEC PG. # 300.11(2) 141 O 91. Which of the following listed raceways is approved for use supplying wet-niche luminaires in a permanently installed swimming pool? Galvanized rigid metal conduit (RMC) B. Polyvinyl chloride conduit (PVC) C. Flexible nonmetallic conduit (FNC) D. All of these listed are approved. A. Question Answer 91. B Reference NEC PG. # 680.23(B)(2) 581 O 92. Power distribution blocks shall be permitted to be placed in pull and junction boxes having a volume over at LEAST _____ for connections of conductors installed in boxes where the power distribution blocks do not have uninsulated live parts exposed within the box, whether or not the box cover is installed. 30 cu. In. B. 60 cu. In. C. 75 cu. In. D. 100 cu. In. A. Question Answer 92. D Reference NEC PG. # 314.28(E)(2) 184 O 93. The circuit disconnecting means for non- power-limited fire alarm (NPLFA) circuits shall have ______ colored identification, shall be accessible only to qualified persons and shall be identified as “FIRE ALARM CIRCUIT.” Red B. Orange C. Yellow D. Blue A. Question Answer 93. A Reference NEC PG. # 760.41(B) 652 O 94. A flexible metal conduit (FMC) having a length of 4 ft. is to supply a panelboard from a transformer. The FMC will contain three (3) size 400 kcmil THWN copper conductors and one (1) size 350 kcmil THWN copper conductor. In compliance with the NEC®, what is the MINIMUM trade size FMC required. 2 ½ in. B. 3 in. C. 3 ½ in. D. 4 in. A. Question Answer 94. C Reference NEC PG. # Annex C, Tbl. C.3 755 O 95. An outside overhead span of 3-phase, 4 wire, 480Y/277 volt conductors are to be installed between two buildings of a college campus. The area the conductors cross will not be subject to truck traffic. The conductors must have a MINIMUM clearance of ______ from final grade. 10 feet B. 12 feet C. 15 feet D. 18 feet A. Question Answer 95. B Reference NEC PG. # 225.18(2) 72 O 96. Cables over 600 volts and those rated 600 volts or less, are permitted to be installed in a common cable tray without a fixed barrier, where the cables over 600 volts are _______. Type MI B. Type NM C. Type CT D. Type MC A. Question Answer 96. D Reference NEC PG. # 392.20(B)(1) 241 O 97. When calculating the total load for a mobile home park before demand factors are taken into consideration, each individual mobile home lot shall be calculated at a MINIMUM of _________. 15,000 VA B. 16,000 VA C. 20,000 VA D. 24,000 VA A. Question Answer 97. B Reference NEC PG. # 550.31(1) 489 O 98. Where a restaurant located in a retail shopping mall has a main circuit breaker rated for 400 amperes, the required bonding jumper to the metal water piping system is to be at LEAST _______ copper. 6 AWG B. 2 AWG C. 3 AWG D. 4 AWG A. Question Answer 98. C Reference NEC PG. # 250.104(A)(2) Tbl. 250.122 119 125 O 99. In general, on the load side of the point of grounding of a separately derived system such as a transformer, a grounded conductor is NOT permitted to be connected to ________. Equipment grounding conductors B. Normally non-current-carrying metal parts of equipment C. The system bonding jumper D. Any of these A. Question Answer 99. D Reference NEC PG. # 250.30(A) 106 O 100. Where one or more receptacle outlets are provided for the show window lighting in a retail store, the outlet(s) shall be installed within at LEAST ________ of the top of the show window. 12 inches B. 18 inches C. 24 inches D. 30 inches A. Question Answer 100. B Reference NEC PG. # 210.62 58