Electrical Wiring Installation in Challenging Environments Quiz
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Questions and Answers

Which of the following is true about the grounding of shield sections in an engineered cabling system?

  • Grounding of shield sections is optional
  • Grounding of shield sections is not required
  • Each shield section should be grounded at multiple points
  • Each shield section should be grounded at one point (correct)

    • What type of backfill should be avoided in an excavation to prevent damage to raceways and cables?

  • Backfill containing cinders
  • Backfill containing corrosive materials
  • Backfill containing large rocks (correct)
  • Backfill containing paving materials

    • What should be used to seal the end of a raceway entering from an underground system within a building?

  • Selected material
  • An identified compound (correct)
  • Granular material
  • Suitable sleeves

    • Which of the following is true about electrical equipment installed in air-handling spaces?

    <p>It must be listed for use within an air-handling space</p> Signup and view all the answers

    What is the maximum peak optical density allowed for electrical equipment tested for low smoke and heat release properties?

    <p>0.50</p> Signup and view all the answers

    What type of power-limited remote-control and signaling circuits should comply with 725.3?

    <p>Class 2</p> Signup and view all the answers

    What is the maximum continuous load allowed for conductors that are 14 AWG copper-clad aluminum?

    <p>8 amperes</p> Signup and view all the answers

    According to the text, what is the minimum bending radius for shielded or lead-covered conductors during or after installation?

    <p>12 times the overall diameter</p> Signup and view all the answers

    According to the text, what type of conductors should be used in raceways installed in wet locations above grade?

    <p>Moisture-impervious metal-sheathed conductors</p> Signup and view all the answers

    According to the text, what should be applied to exposed runs of braid-covered insulated conductors if they do not have flame-retardant protection?

    <p>Flame-retardant saturant</p> Signup and view all the answers

    According to the text, what should be connected to metallic shielding components of shielded cables?

    <p>An equipment grounding conductor, an equipment grounding busbar, or a grounding electrode</p> Signup and view all the answers

    Which of the following spaces does this section apply to?

    <p>Spaces used for air-handling purposes as a plenum</p> Signup and view all the answers

    Which code provides information on how the term 'other spaces used for environmental air (plenum)' correlates with the use of the term 'plenum' for return air purposes?

    <p>NFPA 90A</p> Signup and view all the answers

    Which of the following is NOT a permitted wiring method for other spaces used for environmental air?

    <p>Type AC cable</p> Signup and view all the answers

    Which of the following is NOT a requirement for metallic cable tray systems in other spaces used for environmental air (plenums)?

    <p>Solid side and bottom metal cable tray systems</p> Signup and view all the answers

    Which type of raceway is permitted for direct burial when solid rock prevents compliance with the specified cover depths?

    <p>Nonmetallic raceway</p> Signup and view all the answers

    In industrial establishments, what is the minimum cover requirement for underground installations other than rigid metal conduit and intermediate metal conduit?

    <p>150 mm (6 in.)</p> Signup and view all the answers

    What is the minimum depth at which underground direct-buried cables should be identified by a warning ribbon?

    <p>300 mm (12 in.)</p> Signup and view all the answers

    What is the minimum depth at which a slab should extend beyond an underground installation?

    <p>150 mm (6 in.)</p> Signup and view all the answers

    According to the text, what is the maximum overcurrent protection for 16 AWG copper conductors?

    <p>10 amperes</p> Signup and view all the answers

    According to the text, which types of conductors are permitted for use if they have other types and thicknesses of insulation?

    <p>Type FFH-2, Type KF-2, Type KFF-2, Type PAF</p> Signup and view all the answers

    According to the text, in which article can you find information about wiring methods and materials for systems rated over 1000 volts ac, 1500 volts dc, nominal?

    <p>Article 305</p> Signup and view all the answers

    According to the text, conductors of circuits rated over 1000 volts ac, 1500 volts dc, nominal, shall not occupy the same equipment wiring enclosure, cable, or raceway with conductors of circuits rated 1000 volts ac, 1500 volts dc, nominal, or less unless otherwise permitted. Which of the following is an exception to this rule?

    <p>Conductors of different voltage ratings in motors, transformers, switchgear, switchboards, control assemblies, and similar equipment</p> Signup and view all the answers

    Which type of wiring method is permitted to be installed in ducts specifically fabricated to transport environmental air?

    <p>Type MI cable without an overall nonmetallic covering</p> Signup and view all the answers

    What is the maximum length allowed for flexible metal conduit used to connect physically adjustable equipment and devices in fabricated ducts?

    <p>1.2 m (4 ft)</p> Signup and view all the answers

    Under what conditions are wiring methods or cabling systems listed for use in other spaces used for environmental air (plenums) permitted to be installed in ducts specifically fabricated for environmental air-handling purposes?

    <p>If necessary to connect to equipment or devices associated with the direct action upon or sensing of the contained air, and the total length does not exceed 1.2 m (4 ft)</p> Signup and view all the answers

    Which article in the Code covers general requirements for conductors rated up to and including 2000 volts?

    <p>Article 310</p> Signup and view all the answers

    What is the minimum size of conductors for voltage ratings up to and including 2000 volts?

    <p>Both 14 AWG copper and 12 AWG aluminum</p> Signup and view all the answers

    Which type of conductors are permitted for use if they have other types and thicknesses of insulation?

    <p>All of the above</p> Signup and view all the answers

    According to the text, what is the maximum length allowed for flexible metal conduit used to connect physically adjustable equipment and devices in fabricated ducts?

    <p>15 ft</p> Signup and view all the answers

    According to the text, what is the minimum bending radius for shielded or lead-covered conductors during or after installation?

    <p>15 times the outside diameter of the conductor</p> Signup and view all the answers

    According to the text, what is the maximum peak optical density allowed for electrical equipment tested for low smoke and heat release properties?

    <p>1.4</p> Signup and view all the answers

    According to the text, what is the minimum depth at which underground direct-buried cables should be identified by a warning ribbon?

    <p>6 inches</p> Signup and view all the answers

    According to the text, what is the minimum percentage of copper in the cross-sectional area of a stranded copper-clad aluminum conductor?

    <p>10%</p> Signup and view all the answers

    Which of the following materials is NOT listed as suitable for use with aluminum conductors?

    <p>Copper</p> Signup and view all the answers

    According to the text, what is the maximum operating temperature for thermoplastic insulation rated 600 Volts?

    <p>90°C</p> Signup and view all the answers

    Which type of insulation is required for conductors that are not specifically permitted elsewhere in the code to be covered or bare?

    <p>Thermoset insulation</p> Signup and view all the answers

    According to the text, what is the maximum continuous load allowed for conductors that are 14 AWG copper-clad aluminum?

    <p>25 amps</p> Signup and view all the answers

    According to the text, what is the minimum bending radius for shielded or lead-covered conductors during or after installation?

    <p>2.03 mm (80 mils)</p> Signup and view all the answers

    According to the text, what is the maximum peak optical density allowed for electrical equipment tested for low smoke and heat release properties?

    <p>1.78</p> Signup and view all the answers

    According to the text, what is the maximum length allowed for flexible metal conduit used to connect physically adjustable equipment and devices in fabricated ducts?

    <p>2.79 meters (9.2 feet)</p> Signup and view all the answers

    Which type of cable is suitable for dry and damp locations, has a maximum temperature rating of 90°C, and is flame-retardant and heat-resistant?

    <p>Heat-resistant thermoplastic THHN</p> Signup and view all the answers

    Which type of cable is suitable for wet locations, has a maximum temperature rating of 75°C, and is flame-retardant, moisture-resistant, and heat-resistant?

    <p>Moisture- and heat-resistant thermoplastic THHW</p> Signup and view all the answers

    Which type of cable is suitable for dry and wet locations, has a maximum temperature rating of 75°C, and is flame-retardant, moisture-resistant, and heat-resistant?

    <p>Moisture- and heat-resistant thermoplastic THW</p> Signup and view all the answers

    Which type of cable is suitable for dry and wet locations, has a maximum temperature rating of 90°C, and is flame-retardant and moisture-resistant?

    <p>Moisture- and heat-resistant thermoplastic THHW</p> Signup and view all the answers

    According to the text, which types of conductors are permitted for use in wet locations?

    <p>Types FEP, FEPB, MTW, PFA, RHH, RHW, RHW-2, SA, THHN, THW, THW-2, THHW, THWN, THWN-2, TW, XHH, XHHW, XHHW-2, XHHN, XHWN, XHWN-2, Z, or ZW</p> Signup and view all the answers

    According to the text, which of the following is NOT a requirement for metallic cable tray systems in other spaces used for environmental air (plenums)?

    <p>The cable tray system shall be accessible</p> Signup and view all the answers

    According to the text, what is the maximum length allowed for flexible metal conduit used to connect physically adjustable equipment and devices in fabricated ducts?

    <p>10 feet</p> Signup and view all the answers

    According to the text, what is the maximum continuous load allowed for conductors that are 14 AWG copper-clad aluminum?

    <p>15 amperes</p> Signup and view all the answers

    According to the text, what is the percentage increase in ampacity when the cross-sectional area of a Type THW conductor increases from 1000 to 1500 kcmil?

    <p>15 percent</p> Signup and view all the answers

    According to the text, what is the percentage increase in ampacity when the cross-sectional area of a Type THW conductor increases from 1000 to 2000 kcmil?

    <p>22 percent</p> Signup and view all the answers

    According to the text, when is it beneficial to install two or more paralleled conductors per phase?

    <p>When cost is a factor</p> Signup and view all the answers

    Which section of the Code provides adjustment factors for conductors and ampacity for bare copper and aluminum bars in auxiliary gutters?

    <p>366.23</p> Signup and view all the answers

    According to the text, adjustment factors shall not apply to conductors in raceways with a length not exceeding how many millimeters (inches)?

    <p>600 mm (24 in.)</p> Signup and view all the answers

    Which types of conductors are permitted for use in underground conductors entering or leaving an outdoor trench if those conductors have physical protection in the form of rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride conduit (PVC), or reinforced thermosetting resin conduit (RTRC)?

    <p>All types of conductors</p> Signup and view all the answers

    According to the text, which of the following is NOT a requirement for paralleled conductors?

    <p>Being terminated in the same manner</p> Signup and view all the answers

    According to the text, what is the purpose of locating different phase conductors close together?

    <p>To ensure equal division of current</p> Signup and view all the answers

    According to the text, what is the requirement for the physical characteristics of parallel raceways or cables for a circuit?

    <p>They must be of the same size, material, and length</p> Signup and view all the answers

    According to the text, what is the requirement for equipment grounding conductors used in parallel?

    <p>They must be sized in accordance with 250.122</p> Signup and view all the answers

    According to the text, what is the maximum temperature rating for conductors suitable for wet locations?

    <p>90°C</p> Signup and view all the answers

    According to the text, what is the maximum percentage of copper in the cross-sectional area of a stranded copper-clad aluminum conductor?

    <p>15%</p> Signup and view all the answers

    According to the text, what is the minimum bending radius for shielded or lead-covered conductors during or after installation?

    <p>5 times the overall diameter</p> Signup and view all the answers

    According to the text, what is the maximum continuous load allowed for conductors that are 14 AWG copper-clad aluminum?

    <p>25 amps</p> Signup and view all the answers

    Which of the following factors are considered when determining ampacities for conductors?

    <p>All of the above</p> Signup and view all the answers

    How are ampacities for ambient temperatures other than those shown in the ampacity tables corrected?

    <p>Using Equation 310.15(B)(1)</p> Signup and view all the answers

    What is the minimum depth at which a slab should extend beyond an underground installation?

    <p>19 mm (3/4 in.)</p> Signup and view all the answers

    Which types of conductors are permitted for use if they have other types and thicknesses of insulation?

    <p>All of the above</p> Signup and view all the answers

    Which one of these is the most correct?

    <p>Flexible metal conduit is suitable for use in outdoor locations up to 500 volts.</p> Signup and view all the answers

    According to the text, what is the minimum disconnect rating for a dwelling unit?

    <p>100 amperes</p> Signup and view all the answers

    According to the text, what is the maximum ampacity allowed for feeder conductors supplying the entire load associated with a one-family dwelling?

    <p>83 percent of the feeder rating</p> Signup and view all the answers

    According to the text, what is the maximum ampacity allowed for service conductors supplying the entire load associated with a one-family dwelling?

    <p>83 percent of the service rating</p> Signup and view all the answers

    According to the text, what is the maximum ampacity allowed for single-phase feeder conductors from a 208Y/120 volt system for one-family dwellings and individual dwelling units of two-family and multifamily dwellings?

    <p>310.12(A) through (C)</p> Signup and view all the answers

    According to Table 310.15(C)(1), what is the adjustment factor for a raceway or cable with 7-9 current-carrying conductors?

    <p>70%</p> Signup and view all the answers

    According to the text, when do adjustment factors not apply to Type AC cable or Type MC cable?

    <p>When the cables have an overall outer jacket</p> Signup and view all the answers

    According to the text, when should a 60 percent adjustment factor be applied to cables meeting certain requirements?

    <p>When more than 20 current-carrying conductors are installed longer than 600 mm (24 in.) without maintaining spacing</p> Signup and view all the answers

    According to the text, what is the maximum length allowed for flexible metal conduit used to connect physically adjustable equipment and devices in fabricated ducts?

    <p>127 feet</p> Signup and view all the answers

    What is the maximum length allowed for flexible metal conduit used to connect physically adjustable equipment and devices in fabricated ducts?

    <p>250 feet</p> Signup and view all the answers

    According to the text, what is the minimum depth at which a slab should extend beyond an underground installation?

    <p>203 feet</p> Signup and view all the answers

    According to the text, what is the minimum airspace required between surface-type enclosures and the wall or supporting surface in damp or wet locations?

    <p>1/4 in.</p> Signup and view all the answers

    According to the text, what is the maximum depth of a slab that should extend beyond an underground installation?

    <p>1/4 in.</p> Signup and view all the answers

    According to the text, what is the maximum length allowed for flexible metal conduit used to connect physically adjustable equipment and devices in fabricated ducts?

    <p>18 in.</p> Signup and view all the answers

    According to the text, what is the minimum disconnect rating for a dwelling unit?

    <p>60 amps</p> Signup and view all the answers

    Which of the following factors are considered when determining ampacities for conductors?

    <p>Conductor material, conductor length, and ambient temperature</p> Signup and view all the answers

    Which of the following is an example of a retardant and heat-resistant material?

    <p>Fiberglass</p> Signup and view all the answers

    Which of the following is the correct definition of a conductor?

    <p>A material that allows electric current to flow through it easily</p> Signup and view all the answers

    Which article in the Code covers general requirements for conductors rated up to and including 2000 volts?

    <p>Article 250</p> Signup and view all the answers

    Which of the following is not a type of electrical conductor?

    <p>Iron</p> Signup and view all the answers

    What is the purpose of a ground fault circuit interrupter (GFCI)?

    <p>To protect against ground faults</p> Signup and view all the answers

    What is the maximum voltage rating for a standard household electrical outlet in the United States?

    <p>120 volts</p> Signup and view all the answers

    Which of the following is true about the installation of cables in raceways?

    <p>The cable fill in conduit or tubing should not exceed the amount permitted for complete conduit or tubing systems</p> Signup and view all the answers

    According to the text, what is the maximum number of conductors that can be deflected within a cabinet or cutout box?

    <p>The maximum number of conductors is determined by the width of the wiring gutters</p> Signup and view all the answers

    According to the text, which types of conductors are permitted for use in underground conductors entering or leaving an outdoor trench?

    <p>Conductors with physical protection in the form of rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride conduit (PVC), or reinforced thermosetting resin conduit (RTRC)</p> Signup and view all the answers

    According to the text, what is the minimum bending radius for shielded or lead-covered conductors during or after installation?

    <p>The minimum bending radius is determined by the type of insulation on the conductors</p> Signup and view all the answers

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