NEC Prep Quiz 3 Straight Order [230.53-250.10]
1. Where exposed to the weather, raceways enclosing service entrance conductors shall be _____ for use in wet locations and arranged to drain.
230.53 approved or listed
2. Service heads on raceways or service-entrance cables and goosenecks in service-entrance cables shall be located _____ the point of attachment, unless impracticable.
230.54(C) above
5. Meter sockets supplied by and under the exclusive control of an electric utility shall not be required to be ____ in accordance with 230.66.
230.66 Ex listed
9. Switches containing fuses and circuit breakers shall be readily accessible and installed so the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than _______ above the floor or working platform.
240.24(A) 6ft 7in
8. The standard ampere ratings for fuses include(s)
240.6(A) 1A, 6A or 601A
41. Equipment bonding jumpers shall be of copper, aluminum, coper-clad aluminum, or there corrosion-resistant material.
250.102(A) TRUE
43. A service is supplied by three metal raceways, each containing 600 kcmil ungrounded conductors. Determine the copper supply-side bonding jumper size for each service raceway.
250.102(C)(2) and Table 250.102(C)(1) 1/O AWG
42. Where ungrounded supply conductors are paralleled in two or more raceways or cables, the bonding jumper for each raceway or cable shall be based on the size of the _____ in each raceway or cable.
250.102(C)(2) ungrounded supply conductors
47. Where isolated metal water piping systems are installed in a multiple-occupancy building, the water pipes can be bonded with bonding jumpers sized in accordance with Table 250.122 based on the size of the ________.
250.104(A)(2) rated of the largest overcurrent device supplying the occupancy
49. A building or structure shall have the interior metal water piping system bonded with an equipment grounding conductor sized in accordance with ________.
250.104(A)(3) Table 250.102(C)(1)
7. Where fuses are used as the service overcurrent device, the disconnecting means shall be located ahead of the load side of the fuses in accordance with 230.91
230.91 FALSE
46. The bonding jumper used to bond the metal water piping system shall be sized in accordance with _____ except as permitted in 250.104(A)(2) and 250.104(A)(3)
250.104(A)(1) Table 250.102(C)(1)
45. The bonding jumper used to bond the metal shall be installed in accordance with 250.64(A), 250.64(B), and 250.64€ and the points of attachment of the bonding jumper(s) shall be _______.
250.104(A)(1) accessible
44. Metal water piping system(s) shall be bonded to the ________, or to one or more grounding electrodes used, if the grounding electrode conductor or bonding jumper to the grounding electrode is of sufficient size.
250.104(A)(1)(1),(2),(3), and (4) grounded conductor qat the service, service equipment enclosure, or grounding electrode conductor if of sufficient size.
31. if the grounding electrode conductor or bonding jumper connected to a single or multiple rod, pipe, or plate electrode(s), or any combination thereof, as described in 250.52(A)(5)or (A)(7), does not extend on to other types of electrodes that require a larger size conductor, the grounding electrode conductor shall not be required to be larger than _____ AWG copper wire.
250.66(A) 6
6. Solar photovoltaic systems, fuel cell systems, wind electric systems, energy storage systems, or interconnected electric power production sources are permitted to be connected to the supply side of the service disconnecting means.
230.82(6) TRUE
48. The metal water piping system(s) installed in or attached to a building or structure [250.104(A)(3)] shall be bonded to ________.
250.104(A)(3)(a),(b), and (c) the building or structure disconnecting means enclosure where located at the building or structure the equipment grounding conductor run with the supply conductors or one or more grounding electrodes used
50. Metal gas piping installed in or attached to a building shall be considered bonded when one or more grounding electrodes are used, if the grounding electrode conductor or bonding jumper to the grounding electrode is of sufficient size.
250.104(B)(5) TRUE
14. If a building or structure is supplied by a feeder from an outdoor separately derived system, a system bonding jumper at both the source and the first disconnecting means shall be permitted if doing so does not establish a _____ path for the grounded conductor.
250.30(A)(1) Ex 2 parallel
15. The building or structure grounding electrode system shall be used as the _____ electrode for the separately derived system.
250.30(A)(4) grounding
16. The common grounding electrode conductor installed for multiple separately derived systems shall be permitted to be a _______ pipe that complies with 250.68(C)(1).
250.30(A)(6)(a)(2) metal water
17. The common grounding electrode conductor installed for multiple separately derived systems shall be permitted to be the metal structural frame of the building or structure that complies with 250.68(C)(2) or is connected to the grounding electrode system by a conductor not smaller than _____.
250.30(A)(6)(a)(3) 3/O AWG copper or 250 kcmil aluminum
27. Grounding electrode conductors and grounding electrode bonding jumpers in contact with with ________ shall not be require to comply with 300.5, but shall be buried or otherwise protected if subject to physical damage.
250.64(B)(4) the earth
28. If a building or structure is supplied by a service or feeder with _____ or more disconnecting means in separate enclosures, the grounding electrode connections shall be made in accordance with 250.64(D)(1), 250.64(D)(2), or 250.64(D)(3).
250.64(D) two
29. Ferrous metal raceways and enclosures for grounding electrode conductors shall be electrically continuous from the point of attachment to cabinets or equipment to the grounding electrode.
250.64(E)(1) TRUE
12. The grounded conductor brought to service equipment shall be routed with the phase conductors and shall not be smaller than specified in Table ______ when the service-entrance conductors are 1,100 kcmil copper and smaller.
250.24(C)(1) 250.102(C)(1)
25. A(n) _______ AWG or larger copper or aluminum grounding electrode conductor exposed to physical damage shall be protected in rigid metal conduit, IMC, PVC conduit, reinforced thermosetting resin conduit Type XW (RTRC-XW), EMT, or cable armor.
250.64(B)(2) 6
26. Grounding electrode conductors smaller than _____ AWG shall be protected in rigid metal conduit, IMC, PVC conduit, electrical metallic tubing, or cable armor.
250.64(B)(3) 6
30. Bonding jumper(s) form grounding electrode(s) shall be permitted to be connected to an aluminum or copper busbar not less than ______ and of sufficient length to accommodate the number of terminations necessary for the installation in accordance with 250.64(F)
250.64(F)(3) 1/4 in. thick x 2 in. wide
35. The metal structural frame of a building shall be permitted to be used as a conductor to interconnect electrodes that are part of the grounding electrode system, or as a grounding electrode conductor. Hod-down bolts securing the structural steel column that are connected to a concrete-encased electrode that complies with 250.52(A)(3) and is located in the support footing or foundation shall be permitted to connect the metal structural frame of a building or structure to the concrete encased grounding electrode.
250.68(C)(2) TRUE
4. Individual meter socket enclosures shall not be considered service equipment but shall be ____ for the voltage and ampacity of the service.
230.66 listed and rated
3. The service disconnecting means rated 1,000V or less shall be marked to identify it as being suitable for sue as service equipment and shall be ______.
230.66 listed or field labeled
10. NFPA 780, Standard for the Installation of Lighting Protection Systems provides information on the installation of ______ for lighting protection systems [250.4(A)(1)].
250.4(A)(1) Note 2 ground and bonding
33. Interior metal water piping that is electrically continuous with a metal unground water pipe electrode and is located not more than _____ ft from the point of entrance to the building shall be permitted to extend the connection to an electrode(s).
250.68(C)(1) 5
34. Interior metal water piping that is electrically continuous with a metal unground water pipe electrode and is located not more than _____ ft from the point of entrance to the building shall not be used as a conductor to interconnect electrodes of the grounding electrode system.
250.68(C)(1) 5
36. A rebar-type concrete-encased electrode installed in accordance with 250.52(A)(3) with an additional rebar section extended from its location within the concrete to an accessible location that is not subject to _____ shall be permitted for connection of grounding electrode conductors and bonding jumpers.
250.68(C)(3) corrosion
37. Metal components in a run of underground nonmetallic raceway and isolated form possible contact by a minimum cover of ____ in. to all parts of the metal components shall not be required to be c connected to the grounded system conductor, supply-side bonding jumper, or grounding electrode conductor.
250.80 Ex 18
40. Means for connecting intersystem bonding conductors are not required where communications systems are not likely to be used.
250.94 Ex to (A) and (B) TRUE
38. Metal components shall not be required to be connected to the equipment grounding conductor or supply-side bonding jumper where the metal components are ______.
250.86 Ex 3(1) and (2) installed in a run of nonmetallic raceway(s) and isolated from possible contact by a minimum cover of 18 in. to any part of the metal components or part of an installation of nonmetallic raceway(s) and are isolated from possible contact to any part of the metal components by being encased in not less than 2 in. of concrete
13. Where service-entrance conductors are installed in parallel in two or more raceways or cables, the size of the grounded conductor in each raceway or cable shall be based on the total circular mil area of the parallel ungrounded service-entrance conductors in the raceway or cable, sized in accordance with 250.24(C)(1), but not smaller than _____ AWG
250.24(C)(2) 1/O
18. The connections to a common grounding electrode conductor for multiple separately derived systems may be made to a copper or aluminum busbar that is _______and of sufficient length to accommodate the number of terminations necessary for the installation.
250.30(A)(6)(c)(2) not smaller than 1/4 in thick x 2 in. wide
11. NFPA 780, Standard for the Installation of Lighting Protection Systems provides information on the installation of ______ for lighting protection systems [250.4(B)(1)].
250.4(B)(1) Note ground and bonding
19. One or more metal in-ground upper structure(s) in direct contact with the earth vertically for _____ ft or more, with or without concrete encasement is permitted to be a grounding electrode in accordance with 250.52.
250.52(A)(2) 10
21. Grounding electrodes of bare or electrically conductive coated iron or steel plates shall be at least ______ thick.
250.52(A)(7) 1/4ter
20. A buried iron or steel plate used as a grounding electrode shall expose not less than ______ sq ft of surface area to exterior soil.
250.52(A)(7) 2
22. Swimming pool structures and structural _____ [680.26(B)(1) and (B)(2)] shall not be used as a grounding electrode.
250.52(B)(3) reinforcing steel
23. When a ground ring is used as a grounding electrode, it shall be installed at a depth below the earth's surface of not less than _____.
250.53(F) 30 in.
24. Grounding electrode conductors ____ AWG and larger that are not exposed to physical damage can be run along the surface of the building construction without metal covering or protection.
250.64(B)(1) 6
32. In an ac system, if the size of the grounding electrode conductor or bonding jumper connected to a concrete-encased electrode does not extend on to the other types of electrodes that require a larger size of conductor, the grounding electrodes that require a larger size of conductor, the grounding electrode conductor shall not be required to be larger than _____ AWG copper.
250.66(B) 4
39. Communications system bonding termination connections to an aluminum or copper busbar shall not be less than 1/4 in. thick x 2 in. wide and of sufficient length to accommodate at least _____ terminations for communications systems in addition to other connections.
250.94(B) three
