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Practice Code Look Up

Practice Code Look Up. Two Minute Drill #15. Directions. Left click on the presentation ICON located at the bottom of the slide directory to the left of the this slide.

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Practice Code Look Up

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  1. Practice Code Look Up Two Minute Drill #15 Copyright 2008 Ted "Smitty" Smith

  2. Directions • Left click on the presentation ICON located at the bottom of the slide directory to the left of the this slide. • Each slide will transition to the correct answer automatically in 2:00 minutes. The correct answer will transition in 10 seconds. You may also left click on the slide to manually transition. • Do not worry about writing down the correct answer for now. You will have the opportunity to do that at the end of the two minute drill • Good luck • Remember to start the slide show to activate the timer. Copyright 2005 Ted "Smitty" Smith

  3. Further More This drill is a mixture of calculations and code look up questions. You have seen many of them before. Focus on time. Try to find all the answers before the slide transitions. Remember do not worry about writing down the right answer for now. When you reach the end all of the slides will be repeated without the timer so you can take your time to find the ones you missed and write down the correct answers then. Click on the slide to proceed. Copyright 2005 Ted "Smitty" Smith

  4. Conductors • Equipment grounding conductors shall be permitted to be sectioned within a listed multiconductor cable, provided the combined _______________ complies with 250.122. • Current and load • Voltages of all applied loads • Circular mill area • None of the above Copyright 2008 Ted "Smitty" Smith

  5. Conductors • Circular mill area • 310.13 Copyright 2005 Ted "Smitty" Smith

  6. Conductors • A conductor with insulation marked ZW will be suitable for use in all: • Wet locations • Hospital operating rooms • House boats • None of the above Copyright 2005 Ted "Smitty" Smith

  7. Conductors • Wet locations • Table 310.13(A) Copyright 2005 Ted "Smitty" Smith

  8. Conductors • Where more than one calculated or ____________ ampacity could apply for a given circuit, the lowest value shall be used. • Determined • Tabulated • Corrected • Derated Copyright 2005 Ted "Smitty" Smith

  9. Conductors • Tabulated 310.15(A)(2) Copyright 2005 Ted "Smitty" Smith

  10. Conductors • Where bare or covered conductors are installed with insulated conductors, the temperature rating of the bare or covered conductor shall be _____________ for the purpose of determining ampacity • Equal to the lowest temperature rating of the insulated conductors • Equal to the highest temperature rating of the insulated conductors • Equal to the average temperature ratings of the insulated conductors. • None of the above Copyright 2005 Ted "Smitty" Smith

  11. Conductors • Equal to the lowest temperature rating of the insulated conductors • 310.15(B)(3) Copyright 2005 Ted "Smitty" Smith

  12. Conductors • A 2 AWG TW conductor is installed in a location where the ambient temperature is expected to be 108 degrees F. The temperature correction factor for conductor ampacity in this location is _________. • .96 • .88 • .82 • .71 Copyright 2005 Ted "Smitty" Smith

  13. Conductors • .71 • Table 310.16 Bottom, 60c wire at 102 degrees F. • I recommend using a straight edge when using NEC tables. A clear plastic 6 inch ruler is best. Copyright 2005 Ted "Smitty" Smith

  14. Conductors • If the ambient temperature is 30 degrees C, the minimum insulation that a conductor must have and still have the capacity to carry current is __________ • 60 C • 105 C • 90 C • Any of these Copyright 2008 Ted "Smitty" Smith

  15. Conductors • Any of these • All of these conductors are rated for 30 degrees C Copyright 2005 Ted "Smitty" Smith

  16. Conductors • Determine the minimum sized THHN aluminum conductor that can be installed to feed a load of 104 amperes that is located in a freezer that has an ambient temperature of 22 degrees Celsius. • 1 AWG • 2 AWG • 3 AWG • 1/0 AWG Copyright 2008 Ted "Smitty" Smith

  17. Conductors • 100 A 1/0 AWG • 110.14(c) will require you handle 104 amperes in the 75 C column, so another two wire sizes will be required, therefore 1/0. Copyright 2005 Ted "Smitty" Smith

  18. Conductors • The ampacity of six-current carrying 10 AWG RHW aluminum conductors in a raceway in an ambient temperature of 75 degrees F is ___________ • 30A • 22A • 16A • 12A Copyright 2005 Ted "Smitty" Smith

  19. Conductors • 15.75A • Table 310.16 and 310.15(B)(2)(a) Copyright 2005 Ted "Smitty" Smith

  20. Conductors • The ampacity of nine current carrying 10 AWG THW conductors installed in a 20 inch long raceway is _________. • 25A • 30A • 35A • None of these Copyright 2005 Ted "Smitty" Smith

  21. Conductors • 35A • Bundle factors do not apply to raceways that are 24 inches in length or less. Copyright 2005 Ted "Smitty" Smith

  22. Raceway • Enclosures for switches or over current devices shall not be used as junction boxes, auxiliary gutters, or raceways for conductors feeding through or tapping off to other switches or over current devices, unless adequate space for this purpose is provided. The conductors shall not fill the wiring space at any cross section to more than _______ percent of the cross-sectional area of the space. • 20 • 25 • 35 • 40 Copyright 2005 Ted "Smitty" Smith

  23. Raceway • 40 • 312.8 Copyright 2005 Ted "Smitty" Smith

  24. Raceway • What is the area in square inches for a 14 AWG RHW without outer covering conductor? • 0.0209 • 0.0172 • 0.0252 • 0.0278 Copyright 2005 Ted "Smitty" Smith

  25. Raceways • 0.0209 • Table 5, Chapter 9 Copyright 2005 Ted "Smitty" Smith

  26. Raceways • What is the cross sectional area in square inches for 12 AWG RHH with outer covering conductors? • 0.0117 • 0.0353 • 0.0252 • 0.0327 Copyright 2005 Ted "Smitty" Smith

  27. Raceways • 0.0353 • Table 5, Chapter 9 Copyright 2005 Ted "Smitty" Smith

  28. Raceways • A 200A feeder installed in Schedule 80 rigid non-metallic conduit has three 3/0 AWG THHN, one 2 AWG THHN and one 6 AWG THHN conductors. What is the minimum sized raceway required? • 2 inch • 2.5 inch • 3 inch • 3.5 inch Copyright 2005 Ted "Smitty" Smith

  29. Raceways • 2 inch Copyright 2005 Ted "Smitty" Smith

  30. Raceway • What size rigid metal nipple is required for three 4/0 AWG THHN, one 1/0 AWG THHN and one 4 AWG THHN conductors? • 1.5 inch • 2 inch • 2.5 inch • None of these Copyright 2005 Ted "Smitty" Smith

  31. Raceway • 1.5 inch • 1.239 • 60% fill based on note 4 to Table 1 Copyright 2005 Ted "Smitty" Smith

  32. Raceways • What size outlet box is required for one 12/2 NM cable that terminates on a switch, on 12/3 NM cable that terminates on a receptacle, and the box has manufactured internal cable clamps. • 4 x 1 1/4 square • 4 x 1 1/2 square • 4 x 2 1/8 square • None of these Copyright 2005 Ted "Smitty" Smith

  33. Raceways • 4 x 2 1/8 Square Copyright 2005 Ted "Smitty" Smith

  34. Grounding • Machine screw type fasteners that engage not less than two and thread forming machine screws that engage not less than two threads in the enclosure may be used to mount equipment grounding bars, buses and lugs to enclosures. • True • False Copyright 2005 Ted "Smitty" Smith

  35. Grounding • True • 250.8 Copyright 2005 Ted "Smitty" Smith

  36. Calculations • What is the net computed demand load for the air conditioning and heat for a 40 unit multifamily building that has an air conditioner ( 3hp, 3.91 kW 230V) and two baseboard heaters (3 kW) in each unit. • 160 kW • 240 kW • 6 kW • 5 kW Copyright 2005 Ted "Smitty" Smith

  37. Calculations • 240 kW • Heat is larger load than A/C Copyright 2005 Ted "Smitty" Smith

  38. Calculations • What is the demand load on the main service entrance of an apartment complex that is supplied with a 120/208V single phase service for twelve 3.25 kW ovens? • 10 kW • 18 kW • 15 kW • 20 kW Copyright 2005 Ted "Smitty" Smith

  39. Calculations • 18 kW Copyright 2005 Ted "Smitty" Smith

  40. Calculations • What is the general lighting load for a dwelling unit with 2,700 square feet of living space not including open porches, garages, or unused or unfinished spaces not adaptable for future use? • 8100 VA • 12600 VA • 2700 VA • 6480 VA Copyright 2005 Ted "Smitty" Smith

  41. Calculations • 8100 VA Copyright 2005 Ted "Smitty" Smith

  42. Calculations • What is the feeder or service demand for two 3 kW ranges? • 3 kW • 4.8 kW • 4.5 kW • 3.9 kW Copyright 2005 Ted "Smitty" Smith

  43. Calculations • 4.5 kW Copyright 2005 Ted "Smitty" Smith

  44. Calculations • If the total demand is 30 kW for a 120/240V dwelling unit, what is the minimum sized service and feeder copper conductor size allowed? • 4 AWG • 3/0 AWG • 2 AWG • 1/0 AWG Copyright 2005 Ted "Smitty" Smith

  45. Calculations • 2 AWG • 30,000/240= 125A • Table 310.15(B)(6) shows 2 AWG copper for 125A services Copyright 2005 Ted "Smitty" Smith

  46. Calculations • What is the demand on the main service entrance of a single family dwelling of a range with a nameplate rating of 13.9 kVA at 240 volts? • 8000 VA • 8800 VA • 9600 VA • 10000 VA Copyright 2005 Ted "Smitty" Smith

  47. Calculations • 8800 VA   Table 220.55 Note 1 Copyright 2005 Ted "Smitty" Smith

  48. Services • The disconnecting means for surge protective devices shall not be considered a disconnecting means when determining the maximum number of handles for the service disconnecting means. • True • False Copyright 2005 Ted "Smitty" Smith

  49. Services • True • 230.71(A)(2) Copyright 2005 Ted "Smitty" Smith

  50. Grounding • Metal enclosures and raceways for service conductors and equipment shall be connected to the _______________ system conductor if the electrical system is grounded or to the ________________ conductor for electrical systems that are not grounded. • Grounded/ ungrounded • Grounded/ grounding electrode • Grounding/ grounded • None of the above Copyright 2005 Ted "Smitty" Smith

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