Electricity Inspection Section#2 The service box, ground and panel Quiz#2

You should have finished Study Session 1 before starting this study session. This study session discusses grounding and bonding in general terms and how the system grounding in a house should be arranged.

The estimated completion time is 45 minutes to one hour.

Objectives
At the end of this study session, you should be able to:

• Describe the functions of grounding.
• Explain the terminology used in grounding and bonding.
• Describe the paths that grounding systems may take.
• List the common problems found in system grounds.
• Explain the causes and implications of the conditions.
• Describe the strategies used to identify these conditions.

• Question 1

  Needs Grading

  	From the point where the ground and the neutral wires connect, there are two paths to ground. What are they?
  	Selected Answer: Through neutral service wire to ground Through the ground wire  to ground Correct Answer:   Through the neutral service wire or through the grounding electrode conductor to water pipes or ground rods. Response Feedback: [None Given]

• Question 2

  Needs Grading

  	List 12 common problems found with grounding systems.
  	Selected Answer: 1. No grounding 2. Ground wire attached to plastic pipe 3. Ground wire after (downstream of) meters and valves, with no jumper 4. Spliced ground wire 5. Ground wire attached to abandoned pipe 6. Poor connections 7. Ground connections not accessible 8. Ground rod cut off 9. Corroded ground wire 10. Undersized ground wire 11. Neutral bonded to ground wire after (downstream of) service box 12. Neutral wires not bonded to ground wire at service box 13. Service box not bonded to ground wire 14. No ground in subpanel feeder wires Correct Answer: 1. No grounding 2. Ground wire attached to plastic pipe 3. Ground wire after meters and valves with no jumper 4. Spliced ground wire 5. Ground wire attached to abandoned pipe 6. Poor connection 7. Ground connections not accessible 8. Ground rod cut off 9. Corroded ground rod 10. Undersized ground wire 11. Neutral bonded to ground wire after service box 12. Neutral wires not bonded to ground wire at service box 13. Service box not bonded to ground wire 14. No ground in sub panel feeder wires Response Feedback: [None Given]

• Question 3

  Needs Grading

  	List 2 main functions of grounding.
  	Selected Answer: Protects people from getting electricity shock allow fuses to blow or breakers to trip Correct Answer:   - Grounding provides an emergency safety route for stray electricity; backing up the neutral wires in the distribution system. - Grounding allows electricity to flow, fuses to blow and breakers to trip. Response Feedback: [None Given]

• Question 4

  Needs Grading

  	List 5 destinations where ground wires can terminate.
  	Selected Answer: 1. Meter water supply pipes 2. Metal rods driven into the ground 3. Wire buried in the footings of buildings 4. Buried grounding plates or rings 5. The frames of metal building 6. The metal casings of private water supply wells Correct Answer:   1. Metal water supply pipes 2. Metal rods driven into the ground 3. Wires buried in the footings of buildings (UFER ground) 4. Buried grounding plates or rings 5. The frames of metal buildings (not common in houses) 6. Metal well casings. Response Feedback: [None Given]

• Question 5

  Needs Grading

  	Other than the 2 main functions, what are other functions of grounding?
  	Selected Answer: help carry unexpected electricity charges help eliminate static charges Correct Answer:   - Grounding systems can help dissipate electricity from lightning. - Grounding systems can help avoid the build up of static electricity. Response Feedback: [None Given]

• Question 6

  Needs Grading

  	The difference between bonding and grounding is ________________________.
  	Selected Answer: Bonding is simply connecting two electrical conductors together, not connecting to earth Correct Answer:   Grounding connects things to ground, which has zero electrical potential. Bonding connects things so that they will have the same electrical potential, but not necessarily zero volts. Response Feedback: [None Given]

• Question 7

  Needs Grading

  	The grounding electrode conductor is the ________________________.
  	Selected Answer: [None Given] Correct Answer:   Ground wire. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	The grounding system is connected to the house neutral at the _______________.
  	Selected Answer: service box Correct Answer:   Service box Response Feedback: [None Given]

• Question 9

  0 out of 0 points

  	A 100-amp service would typically have a _____ gauge copper ground wire (insert a number).
  	Selected Answer:  8 Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 6 Response Feedback: That's not correct

• Question 10

  0 out of 0 points

  	You are allowed to ground to the gas piping.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work