Smitty’s Two Minute Drill Services, Feeders, and Branch Circuits 1 © Ted Smith 2017 Electrical Experts Consulting sparkyprof@gmail.com

Click on the slide to start the timer and begin the test Be sure to place this presentation in Slide Show Mode if it is not already in that mode before proceeding The purpose of this drill is to help you improve your skill at finding answers to questions using the applicable fire codes and also to help increase your knowledge of the Fire Alarm codes. Each slide will contain a question. The question will remain in the screen for a period of 2 minutes then a notification will sound and the slide will transition to the next slide with the answer. After 15 seconds the next question will appear. During the test do not worry about the correct answers when those slide appear. You will be given an opportunity to review the answers with out the time at the end of the test. Click on the slide to start the timer and begin the test Instructions

This drill is based on your ability to find things quickly in the National Electric Code and your ability to understand the code requirements. Be sure to use the Targeting method to find things quickly. Be sure to the have the Chapter Titles of the NEC chapters memorized as this will speed you up. NOTE

Chapters 1-4 of the NEC are the National Electric Code and the requirements found there apply to all occupancies and installations. Chapters 5-7 Modify and Amend the Requirements found in Chapters 1-4 of the NEC Chapter 8 is a Code within a Code and only those things specifically cited in Chapter 8 from Chapters 1-4 apply to things in Chapter 8 REMEMBER 90.3

REMEMBER Branch Circuit Requirements are found in Article 210 Feeder Requirements are found in Article 215 And Service Requirements are found in Article 230 Some of these questions may also come from Article 220 if they are calculating the load

CLICK THIS SLIDE TO START THE TIMED PORTION OF THE DRILL This Photo by Unknown Author is licensed under CC BY-SA

NEC 1. Where the premises wiring system has feeders supplied from more than one nominal voltage system, each ungrounded conductor of a feeder shall be identified by _____________ or ______________ and system at all termination, connection, and splice points. Phase, line Phase, system Line, letter Grounded, grounding

Answer 1. B 215.12(C)(1)

NEC 2. Branch circuits installed for the purpose of lighting, central alarm, signal, communications or other purposes for public or common areas of a two family dwelling, a multifamily dwelling, or a _____________________ building shall not be supplied from equipment that supplies an individual dwelling unit or tenant space. Dormitory Multiple-occupancy Government Office

Answer 2. B 210.25(B)

NEC 3. Service disconnecting means may be installed in any of the following areas, except __________. Living room Closet Kitchen Bathroom

3. D. 230.70(A)(2) Answer

NEC 4. What is the calculated load, in amperes, on the branch circuits for 245 feet of track lighting installed in an retail store. Assume the load will be at full for periods of 12 hours typically and the branch circuits are 120 VAC. 153.75 amperes 192.19 amperes 85 amperes 69.87 amperes

18450 x 1.25( Continuous Load 210.19 and Definitions)=23062.52 4. B 220.43(B) 245/2= 122.5 123x 150=18450 18450 x 1.25( Continuous Load 210.19 and Definitions)=23062.52 23062.52/120=192.1875 Answer

NEC 5. Service conductors shall be considered to be outside the building or other structure under any of the following conditions, except: Where installed under not less than 2 inches of concrete Where installed within a building or other structure in a raceway that is encased in brick that is 2 inches thick Where installed in Rigid Metal Conduit size 3” or greater Where installed in conduit and under not less than 18 inches of earth beneath a building or other structure

5. C 230.6 (1-5) Answer

NEC 6. Ground fault protection of equipment shall be provided for solidly grounded wye electric services of more than ___________ to ground but not exceeding 100 volts phase to phase. 208 V 150 V 277 V 120 V

Answer 6. B 230.95

NEC 7. The ampacity of feeders supplying a combination of transformers and utilization equipment shall not be less than the sum of the nameplate ratings of the transformers and ___________ percent of the designed potential load of the utilization equipment that will be operated simultaneously. 100 115 125 167

7. C 215.2(B)(2) Answer

NEC 8. For installations consisting of not more than two (2), 2-wire branch circuits, the service disconnecting means shall have a rating of not less than _________ amperes. A. 70 amperes B. 60 amperes C. 100 amperes D. 30 amperes

8. D 230.79(B) Answer

NEC 9. At least one receptacle outlet shall be installed in bathrooms of dwelling units within _____ inches of the outside edge of each basin. 12 18 24 36

9. D 210.52(D) Answer

NEC 10. When there is more than one service disconnect they shall be _______________ and each disconnect shall be marked to indicate the load served. Identified with the location of the other disconnects at each location Grouped Colored blue NEMA 6X Rated

10. B 220.72(A) Answer

NEC 11. Where a feeder is supplied from a DC system operating at more than ___________ volts, each ungrounded conductor of 4 AWG or larger shall be identified by polarity at all termination, connection, and splice points by marking tape, tagging, or other approved means. 50 60 600 1000

11. B 215.12(C)(2) Answer

NEC 12. The rating of any one cord and plug connected utilization equipment not fastened in place shall not exceed __________ percent of the branch circuit ampere rating. 100 80 50 25

12. B 210.23(A)(1) Answer

NEC 13. Service entrance cables, where subject to physical damage, shall be protected by any of the following, except: Rigid Metal Conduit Electrical Metallic Tubing Schedule 40 PVC Conduit Reinforced Thermosetting resin Conduit

13. C 230.50(B)(1) Answer

NEC 14. Each meeting room of not more than ____________ square feet in other than dwelling units shall have outlets for nonlocking-type, 125 volt, 15 or 20 ampere receptacles. 200 500 215 1000

14. D 210.71(A) Answer

NEC 15. All 120V, single phase, 15 or 20 ampere branch circuits supplying outlets and devices installed in bathroom areas in the following occupancies must be protected by a combination AFCI device, except: Dwelling units Guest Rooms or Guest Suites of Hotels Dormitory Government office buildings

Answer 15. D 210.12(C)

END of QUIZ. THE TIME WILL STOP NOW END of QUIZ. THE TIME WILL STOP NOW. PLEASE CLICK ON THE SLIDE TO CONTINUE WITHOUT THE TIMER AND REVIEW EACH QUESTION.

NEC 1. Where the premises wiring system has feeders supplied from more than one nominal voltage system, each ungrounded conductor of a feeder shall be identified by _____________ or ______________ and system at all termination, connection, and splice points. Phase, line Phase, system Line, letter Grounded, grounding

Answer 1. B 215.12(C)(1)

NEC 2. Branch circuits installed for the purpose of lighting, central alarm, signal, communications or other purposes for public or common areas of a two family dwelling, a multifamily dwelling, or a _____________________ building shall not be supplied from equipment that supplies an individual dwelling unit or tenant space. Dormitory Multiple-occupancy Government Office

Answer 2. B 210.25(B)

NEC 3. Service disconnecting means may be installed in any of the following areas, except __________. Living room Closet Kitchen Bathroom

3. D. 230.70(A)(2) Answer

NEC 4. What is the calculated load, in amperes, on the branch circuits for 245 feet of track lighting installed in an retail store. Assume the load will be at full for periods of 12 hours typically and the branch circuits are 120 VAC. 153.75 amperes 192.19 amperes 85 amperes 69.87 amperes

18450 x 1.25( Continuous Load 210.19 and Definitions)=23062.52 4. B 220.43(B) 245/2= 122.5 123x 150=18450 18450 x 1.25( Continuous Load 210.19 and Definitions)=23062.52 23062.52/120=192.1875 Answer

NEC 5. Service conductors shall be considered to be outside the building or other structure under any of the following conditions, except: Where installed under not less than 2 inches of concrete Where installed within a building or other structure in a raceway that is encased in brick that is 2 inches thick Where installed in Rigid Metal Conduit size 3” or greater Where installed in conduit and under not less than 18 inches of earth beneath a building or other structure

5. C 230.6 (1-5) Answer

NEC 6. Ground fault protection of equipment shall be provided for solidly grounded wye electric services of more than ___________ to ground but not exceeding 100 volts phase to phase. 208 V 150 V 277 V 120 V

Answer 6. B 230.95

NEC 7. The ampacity of feeders supplying a combination of transformers and utilization equipment shall not be less than the sum of the nameplate ratings of the transformers and ___________ percent of the designed potential load of the utilization equipment that will be operated simultaneously. 100 115 125 167

7. C 215.2(B)(2) Answer

NEC 8. For installations consisting of not more than two (2), 2-wire branch circuits, the service disconnecting means shall have a rating of not less than _________ amperes. A. 70 amperes B. 60 amperes C. 100 amperes D. 30 amperes

8. D 230.79(B) Answer

NEC 9. At least one receptacle outlet shall be installed in bathrooms of dwelling units within _____ inches of the outside edge of each basin. 12 18 24 36

9. D 210.52(D) Answer

NEC 10. When there is more than one service disconnect they shall be _______________ and each disconnect shall be marked to indicate the load served. Identified with the location of the other disconnects at each location Grouped Colored blue NEMA 6X Rated

10. B 220.72(A) Answer

NEC 11. Where a feeder is supplied from a DC system operating at more than ___________ volts, each ungrounded conductor of 4 AWG or larger shall be identified by polarity at all termination, connection, and splice points by marking tape, tagging, or other approved means. 50 60 600 1000

11. B 215.12(C)(2) Answer

NEC 12. The rating of any one cord and plug connected utilization equipment not fastened in place shall not exceed __________ percent of the branch circuit ampere rating. 100 80 50 25

12. B 210.23(A)(1) Answer

NEC 13. Service entrance cables, where subject to physical damage, shall be protected by any of the following, except: Rigid Metal Conduit Electrical Metallic Tubing Schedule 40 PVC Conduit Reinforced Thermosetting resin Conduit

13. C 230.50(B)(1) Answer

NEC 14. Each meeting room of not more than ____________ square feet in other than dwelling units shall have outlets for nonlocking-type, 125 volt, 15 or 20 ampere receptacles. 200 500 215 1000

14. D 210.71(A) Answer

NEC 15. All 120V, single phase, 15 or 20 ampere branch circuits supplying outlets and devices installed in bathroom areas in the following occupancies must be protected by a combination AFCI device, except: Dwelling units Guest Rooms or Guest Suites of Hotels Dormitory Government office buildings

Answer 15. D 210.12(C)