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Groundg and Bondg
Gounding andBonding Test
| Question | Answer |
|---|---|
| A supply side bonding jumper is required to be sized based on the overcurrent device protecting the circuit. T/F | False |
| What is the largest size aluminum grounding electrode conductor required by the NEC? | 250 kcmil |
| How many equipment grounding conductors are required to be installed with branch circuits serving patient care spaces? | 2 |
| Equipment grounding conductors installed with medium-voltage cables are generally required to be sized based on Table 250.122 and never smaller than ? copper. | 6 AWG |
| What is the minimum-size copper equipment grounding conductor required for a 60-ampere branch circuit? | 10 AWG |
| What part of Article 250 covers grounding electrode conductors? | Part III |
| A bonding conductor for a metal water piping system is sized using ? . | Table 250.102(C)(1) |
| What is the circular mil area of a 6 AWG copper conductor? | 26,240 (table 8) |
| NEC Table ? is required to be used for minimum sizing of equipment grounding conductors for branch circuits and feeders. | 250.102(C)(1) |
| A metal underground water pipe that is in direct contact with the Earth for ? or more is a code-recognized as a grounding electrode and must be included in the grounding electrode system. | 10 feet |
| The NEC generally prohibits the use of an interior metal water piping system to connect grounding electrodes to the grounding electrode conductor beyond a distance of ? from the point of entrance to the building or structure. | 5 ft |
| 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. | 20 ft |
| Name the four conductors in the grounding and bonding scheme for a service supplied by a grounded system? | a. Equipment grounding conductor b. Grounded conductor Incorrect c. Grounding electrode conductor d. Main bonding jumper Incorrect |
| The grounded neutral conductor serves which two purposes for a grounded service? | 1. Carries the maximum unbalanced return neutral load 2.Serves as an effective ground-fault current path in ground fault conditions |
| What 6 characteristics are required for ungrounded conductors installed in parallel? | I. Must be not smaller than 1/0 AWG (generally) II. Must be the same conductor material III. Must be the same insulation type IV. Must be the same length V. Same size VI. Terminated the same |
| The service disconnecting means used for a grounded supply system is required to be listed as suitable for use as service equipment. T/F | True |
| A grounding electrode connection is required to be made at a(n) ? location anywhere from the load end of the overhead service conductors, service drop, underground service conductors, or service lateral up to and including the terminal or bus to which the grounded conductor is connected in the service disconnecting means. | accessible Article 250.68 (C)(A) |
| 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? a. Equipment grounding conductor b. Grounded conductor c. Grounding electrode conductor d. Main bonding jumper e. System bonding jumper | e. System bonding jumper |
| If a main bonding jumper is a wire type, what NEC table is used to size it? | Table 250.102(C)(1) |
| Which NEC table is used for sizing grounding electrode conductors and bonding jumpers between electrodes in the grounding electrode system? | Table 250.66 |
| 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? | 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). The correct answer is: 3/0 AWG copper |
| The minimum-size grounding electrode conductor required for a ring-type electrode is not less than ? AWG copper. | 2 250.52(A)(4) |
| What is the largest size required for a copper grounding electrode conductor that is connected only to a concrete-encased electrode? | 4 AWG copper 250.52(A)(4) |
| All grounding electrode conductors in sizes smaller than ? must be protected from physical damage by installation in raceway or cable armor. | 6 AWG |
| When installing grounding electrode conductor taps from a common grounding electrode conductor to each separate service disconnecting means enclosure, the minimum size required for the grounding electrode conductor taps is based on the ? . | size of the largest ungrounded service conductor in each enclosure using Table 250.66 |
| 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. | 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). |
| A single grounding electrode conductor installed in a ferrous metal raceway must not exceed ? of the cross-sectional area of the raceway. | 53% |
| 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? | 2 AWG copper Table |
| The minimum-size grounding electrode conductor required for a ring-type electrode is not less than ? AWG copper. | 2 AWG 250.52 (A)(4) |
| An aluminum grounding electrode conductor is not permitted to be connected to a grounding electrode at a distance less than ? from the Earth. | 18" |
| When installing grounding electrode conductor taps from a common grounding electrode conductor to each separate service disconnecting means enclosure, the minimum size required for the grounding electrode conductor taps is based on the ? . | size of the largest ungrounded service conductor in each enclosure using Table 250.66 |
| 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. | 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). |
| A single grounding electrode conductor installed in a ferrous metal raceway must not exceed ? of the cross-sectional area of the raceway. | 53% |
| 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? | 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). |
| A ? is a conductor installed on the supply side of a service or separately derived system to ensure the required electrical conductivity between metal parts required to be electrically connected. | supply side bonding jumper |
| A(n) ? is the connection between two or more portions of the equipment grounding conductor. | equipment bonding jumper |
| A system bonding jumper is the connection between the grounded conductor and the equipment grounding conductor or ? , or both, at a separately derived system. | supply-side bonding jumper |
| Which part of Article 250 provides specific electrical bonding requirements? | part 5 |
| Where loosely jointed metal raceways are used and, especially where there are expansion joints or telescoping sections of raceways, the National Electrical Code requires that they be made electrically continuous by the use of a(n) ? unless the fitting is listed for use without a field inspected equipment bonding jumper. | equipment bonding jumper |
| What is the minimum-size copper bonding jumper required for an interconnected exposed structural metal if the service is rated 1,000 amperes and supplied by two parallel 600 kcmil copper conductors for each ungrounded service phase conductor? | 3/0 AWG 250.24(C)(2) Hint: parallel Cmills added |
| Where a building or structure is supplied by a feeder or branch circuit, the bonding jumper to the metal water piping system(s) is required to be sized according to ? , based on the size of the feeder or branch circuit that supplies the building or structure. | Table 250.102(C)(1) |
| #36 Lesson 7: Referring to the drawing, what is the minimum size required for the copper supply-side bonding jumper in this service and what is the minimum size required for a copper load-side bonding jumper? | 2 AWG / 4 AWG |
| Which of the following tables is used to size bonding conductors or jumpers for interior metal water piping systems? | Table 250.102(C)(1) |
| What is the minimum size copper bonding conductor for an interior metal water piping system if the building is supplied by a service that has a large ungrounded service entrance conductor size of 2,500 kcmil? | Note: 2,500 kcmil x 12.5% = 312,500 kcmil round up to the next standard available size is 350 kcmil based on Table 8, Chapter 9 and Table 250.102(C)(1). The correct answer is: 350 kcmil |
| The largest size bonding jumper or conductor for interconnected exposed structural metal building frames is 3/0 copper or 250 aluminum. T/F | Note: The NEC now requires interior metal water piping systems and exposed interconnected structural metal building framing to be bonded with conductors or jumpers not smaller than the sizes in Table 250.102(C)(1). The correct answer is 'False'. |
| Bonding wedges are suitable for use to accomplish the bonding required by 250.92(B)(2) through (4 | True |
Created by:
Shawnt321