Smitty’s Two Minute Drill Grounding

Smitty’s Two Minute Drill Grounding 2017-2
A drill to help you improve your code skills and your ability to find answers in the code book. © Ted “Smitty” Smith 2016, 2017

Directions Left click on the presentation ICON located at the bottom of the slide directory to the left of the this slide or in the top menu under SlideShow. Each slide will transition to the correct answer automatically in 2:00 minutes. The correct answer will transition in 5 seconds. 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 have the best effectiveness, put this presentation in slide show mode and use the timers. This will help you get to 2 minutes per question. Do no worry about the answers until you get through the timed section. Following the timed section, the slides are repeated without time so you can look them up.

Question 1 What is required to be installed with the ungrounded conductors to a grounded service in a separate building? A. a grounded conductor B. a grounding electrode conductor C. a main bonding jumper D. a equipment grounding conductor Copyright 2017 Ted "Smitty" Smith

Question 1 Answer 250.32(B) D. an equipment grounding conductor
Copyright 2005 Ted "Smitty" Smith

Question 4 Vehicle mounted generators can serve users without a grounding electrode connection under what conditions? A. The generator frame is bonded to the vehicle B. The generator only can supply equipment mounted on it, or loads fed through receptacles located on it. C. All metal parts of the equipment are connected to the generator frame D. All of the above Copyright 2017 Ted "Smitty" Smith

Question 4 Answer 250.34(B) D. All of the above

Question 5 Under what conditions can the grounded circuit conductor be used for grounding of equipment in a separate building supplied by a feeder conduit? When it is a previous existing installation and compliant with the NEC at the time of installation Where no other metallic paths exist Where an equipment grounding conductor does not also exist All of the above must be true Copyright 2005 Ted "Smitty" Smith

Question 5 D. All of the above must be true 250.32(B) Ex. 1

Question 9 Which of the following would be considered an acceptable form of an equipment grounding conductor for a feeder or branch circuit? A. Electrical Metallic Tubing B. Rigid Metal Conduit C. Cable sheath of an AC cable D. Any of the above Copyright 2005 Ted "Smitty" Smith

Question 9 answer D. Any of the above 250.32(B) and 250.118

Question 10 Can buildings that are fed by a feeder and not a service conductor still require a grounding electrode? A. Yes, if multiple circuits exist to the building B. No C. Yes under any circumstances D. Yes, if the feeder is smaller than 30 ampere conductors Copyright 2005 Ted "Smitty" Smith

Question 10 Answer 250.32(A) C. Yes, under any circumstances

Question 11 What provisions must be met for a portable generator to be used without providing a grounding electrode? A. The metal parts of the receptacles on the generator must be connected to the equipment grounding terminals of the generator B. The generator only can supply equipment mounted on it C. The generator can only serve loads fed through receptacles on the generator D. All of the above Copyright 2017 Ted "Smitty" Smith

Question 11 Answer 250.34(A) D. All of the above

Question 12 Which of the following are acceptable Equipment Grounding conductors supplying a separate building with a feeder rated at 400A? A. Rigid Metal Conduit B. PVC Schedule 80 C. Three foot section of Listed Flexible Metal Conduit D. PVC schedule 40 Copyright 2016 Ted "Smitty" Smith

Question 13 A vehicle mounted generator not meeting the requirements of having the frame bonded to the vehicle would require what in order for it to be used? A. Connected to portable loads only B. Connected to a grounding electrode system C. Connected to the incomplete grounding system at the site D. Connected to a water pipe driven at least three deep into the earth Copyright 2005 Ted "Smitty" Smith

Question 13 answer B. Connected to a grounding electrode system

Question 14 Can an ungrounded system be used to supply a separate building? A. Never B. If the owner choses to take responsibility for electrical failures C. If the grounding electrode are connected to the structure disconnect D. If the serving utility has no other options Copyright 2017 Ted "Smitty" Smith

Question 15 If located on the line side of the service, as supply side bonding jumper shall be sized at a percentage of the ungrounded conductors if the supply conductors are larger than 1750 kcmil Aluminum or 1100 kcmil copper, what is the percentage? 80% 125% 50% 12.50% Copyright 2005 Ted "Smitty" Smith

Question 15 D. 12.50% T250.102(C)(1) 12.5% rule Note 2

Question 16 May standard locknuts be used for bonding at the service if the raceway encloses service conductors and it is installed in concentric knockouts? Yes, if listed and a bonding bushing is applied to the other end of the raceway Yes, always No No,. Unless of the steel type Copyright 2005 Ted "Smitty" Smith

Question 16 answer 250.92(B) Impaired connections C. No

Question 17 Metal water pipe bonding conductors shall be sized in accordance with? A. T250.66 B. T with provisions of C. T D. Designer requirements, if licensed for the jurisdition Copyright 2005 Ted "Smitty" Smith

Question 17 answer B. T250.66 with provisions from 250.104 250.104 (A)
This was changed in the 2017 NEC so that it is now sized in accordance with T (C)(1) only Copyright 2005 Ted "Smitty" Smith

Question 18 One method of bonding at the service location is ________.
A. Rigid metal conduit installed with a locknut on both sides of the box B. PVC schedule 80 Threaded adaptor C. Threaded couplings made up wrench tight D. Flexible connectors that are approved Copyright 2005 Ted "Smitty" Smith

Question 18 answer C. Threaded connectors or hubs 250.92(B)

Question 19 If located on the load side of the service, an equipment bonding jumper shall be sized in accordance with which of the following? A. T250.66 B. T C. #12 AWG, if under 100 amp fusing D. #14 if the circuit is protected by an overcurrent protective device less than 200 Amps. Copyright 2005 Ted "Smitty" Smith

Question 20 The requirement exists for a termination device used to join all building system grounding and bonding systems together. It is referred to as the ___________________________. A. Multi-system bonding device B. Intersystem bonding termination device C. Main system bonding termination D. Multi-bond connector Copyright 2005 Ted "Smitty" Smith

Question 10 Answer 250.94 B. Intersystem Bonding Termination Device

End of Drill Click on this slide to continue to the repeat of the questions. The timer will not operate in this section. Click on each slide to advance. Review the questions and look up the answers. Copyright 2005 Ted "Smitty" Smith

Question 1 What is required to be installed with the ungrounded conductors to a grounded service in a separate building? A. a grounded conductor B. a grounding electrode conductor C. a main bonding jumper D. a equipment grounding conductor Copyright 2017 Ted "Smitty" Smith

Question 1 Answer 250.32(B) D. an equipment grounding conductor