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FREE AND STUDY GAMES ABOUT GROUNDG AND BONDG
EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -44 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: What size copper grounding electrode conductor is required for a
6,000-ampere service supplied by ten 750 kcmil copper service conductors in parallel for each ungrounded service entrance phase conductor?
Answer:
3/0 AWG copper
Note: Point out that Table 250.66 provides the maximum-size copper and aluminum or cooper-clad aluminum grounding electrode conductor. The 12.5% rule does not apply when sizing grounding electrode conductors. The 12.5% rule applies to Table 250.102(C)(1).Question 2: The service disconnecting means used for a grounded supply system is required to be listed as suitable for use as service equipment. T/F
Answer:
True Question 3: All grounding electrode conductors in sizes smaller than ? must be protected from physical damage by installation in raceway or cable armor.
Answer:
- AWG
Question 4: What is the minimum-size copper equipment grounding conductor required for a 60-ampere branch circuit?
Answer:
10 AWG
Question 5: If a service is supplied by 4/0 AWG copper ungrounded service-entrance conductors, what is the minimum-size grounding electrode conductor required to a metal underground water pipe electrode?
Answer:
- AWG copper
Table Question 6: Bonding wedges are suitable for use to accomplish the bonding required by 250.92(B)(2) through (4
Answer:
True Question 7: If a main bonding jumper is a wire type, what NEC table is used to size it?
Answer:
Table 250.102(C)(1) Question 8: What is the largest size aluminum grounding electrode conductor required by the NEC?
Answer:
250 kcmil Question 9: A(n) ? is the connection between two or more portions of the equipment grounding conductor.
Answer:
equipment bonding jumper Question 10: Which part of Article 250 provides specific electrical bonding requirements?
Answer:
part 5
Question 11: Equipment grounding conductors installed with medium-voltage cables are generally required to be sized based on Table 250.122 and never smaller than ? copper.
Answer:
- AWG
Question 12: Which of the following tables is used to size bonding conductors or jumpers for interior metal water piping systems?
Answer:
Table 250.102(C)(1) Question 13: Which of the following is not one of the four conductors in the grounding and bonding scheme for a service supplied by a grounded system?
- Equipment grounding conductor
- Grounded conductor
- Grounding electrode conductor
- Main bonding jumper
- System bonding jumper
Answer:
- System bonding jumper
Question 14: How many equipment grounding conductors are required to be installed with branch circuits serving patient care spaces?
Answer:
2 Question 15: A supply side bonding jumper is required to be sized based on the overcurrent device protecting the circuit. T/F
Answer:
False
Question 16: When using the common grounding electrode conductor tap method for grounding services with separate disconnecting means enclosures, the minimum size required for the common grounding electrode conductor is not less than 3/0 copper or 250 aluminum.
Answer:
False.Note:Explain the difference between the common grounding electrode conductor tap concept used for separately derived systems [250.30(A)(6)] and this one used for services covered by 250.64(D)(1).Question 17: The grounded neutral conductor serves which two purposes for a grounded service?
Answer:
- Carries the maximum unbalanced return neutral load
2.Serves as an effective ground-fault current path in ground fault conditions Question 18: A concrete-encased electrode can be installed in either a vertical or horizontal orientation, and it must have not less than ? of one or more conductive rebar or rods, or a 4 AWG bare copper conductor.
Answer:
20 ft Question 19: When using the common grounding electrode conductor tap method for grounding services with separate disconnecting means enclosures, the minimum size required for the common grounding electrode conductor is not less than 3/0 copper or 250 aluminum.
Answer:
False Note: Explain the difference between the common grounding electrode conductor tap concept used for separately derived systems [250.30(A)(6)] and this one used for services covered by 250.64(D)(1).Question 20: What size copper grounding electrode conductor is required for a 6,000-ampere service supplied by ten 750 kcmil copper service conductors in parallel for each ungrounded service entrance phase conductor?
Answer:
3/0 AWG copper Note: Point out that Table 250.66 provides the maximum-size copper and aluminum or cooper-clad aluminum grounding electrode conductor. The 12.5% rule does not apply when sizing grounding electrode conductors. The 12.5% rule applies to Table 250.102(C)(1).
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