Mastering Power and Control Tray Cables
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Mastering Power and Control Tray Cables

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Questions and Answers

According to the article, what is the basic standard to investigate power and control tray cable?

  • ANSI/UL 300
  • ANSI/UL 1277 (correct)
  • ANSI/UL 760
  • ANSI/UL 336

    • Where can you find summary information regarding listed power and control tray cable?

  • ANSI/UL 760
  • UL 1277
  • ANSI/UL 336
  • UL Guide Information for Electrical Equipment (correct)

    • According to the article, what are the permitted uses of Type TC cable?

  • Power, lighting, control, and signal circuits (correct)
  • Data transmission and telecommunications
  • Fiber optic networks
  • Audio and video circuits

    • Which type of cable is permitted to extend from a cable tray to a piece of equipment without the use of conduit?

    <p>Type TC-ER</p> Signup and view all the answers

    What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?

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

    What is the minimum bending radius for Type TC cable without metallic shielding?

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

    How is the ampacity of Type TC tray cable determined for 18 AWG through 16 AWG conductors installed in cable trays?

    <p>In accordance with 402.5</p> Signup and view all the answers

    Which types of conductors are suitable for branch circuit and feeder circuits?

    <p>14 AWG through 1000 kcmil copper, nickel, or nickel-coated copper</p> Signup and view all the answers

    What is the minimum conductor size for control and signal conductors?

    <p>18 AWG copper, nickel, or nickel-coated copper</p> Signup and view all the answers

    What type of cable should be used for thermocouple circuits?

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

    Which types of rigid metal conduit (RMC) are permitted to be installed in concrete, in direct contact with the earth, in direct burial applications, or in areas subject to severe corrosive influences where protected by corrosion protection approved for the condition?

    <p>Galvanized steel, stainless steel, and red brass RMC, elbows, couplings, and fittings</p> Signup and view all the answers

    Under what conditions is aluminum RMC permitted to be installed?

    <p>Where approved for the environment</p> Signup and view all the answers

    What types of ferrous raceways and fittings are permitted to be installed indoors and in occupancies not subject to severe corrosive influences?

    <p>Ferrous raceways and fittings protected from corrosion solely by enamel</p> Signup and view all the answers

    According to 348.30(A), how far should FMC be securely fastened in place from each box, cabinet, conduit body, or other conduit termination?

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

    What is the maximum interval at which FMC should be supported and secured?

    <p>1.4 m (4.5 ft)</p> Signup and view all the answers

    Which exception allows for the use of FMC without supporting it in certain situations?

    <p>Exception No. 1</p> Signup and view all the answers

    Which materials are permitted to be installed in or under cinder fill where subject to permanent moisture?

    <p>Galvanized steel, stainless steel, and red brass RMC</p> Signup and view all the answers

    Which metals should be avoided in contact with each other to eliminate the possibility of galvanic action?

    <p>Dissimilar metals</p> Signup and view all the answers

    Which combination of metals shows minor galvanic corrosion at their interfaces?

    <p>Steel and aluminum</p> Signup and view all the answers

    What is the maximum size of RMC that should not be used?

    <p>RMC larger than metric designator 155 (trade size 6)</p> Signup and view all the answers

    Which type of conduit is permitted to be supported at intervals not exceeding 6 m (20 ft) for exposed vertical risers from industrial machinery or fixed equipment?

    <p>Rigid Metal Conduit (RMC)</p> Signup and view all the answers

    Which type of conduit is permitted to be supported by openings through framing members at intervals not exceeding 3 m (10 ft) for horizontal runs?

    <p>Rigid Metal Conduit (RMC)</p> Signup and view all the answers

    Which type of conduit is permitted to be supported (but not necessarily secured) by framing members at 10-foot intervals, provided it is secured and supported at least 3 feet from the box or enclosure?

    <p>Rigid Metal Conduit (RMC)</p> Signup and view all the answers

    Which type of conduit is permitted as an equipment grounding conductor?

    <p>Rigid Metal Conduit (RMC)</p> Signup and view all the answers

    Which one of the following is true about the radius of the curve of a field bend in a conduit?

    <p>The radius should not be less than indicated in Table 2, Chapter 9 Number in One Run</p> Signup and view all the answers

    Which one of the following is true about the total degrees of bends in a conduit run?

    <p>The total degrees of bends should not exceed 360 degrees between pull points</p> Signup and view all the answers

    Which one of the following is true about reaming and threading of conduit cut ends?

    <p>A standard cutting die with a 1 in 16 taper should be used for threading</p> Signup and view all the answers

    Which one of the following is true about securing and supporting RMC conduit?

    <p>RMC should be supported at intervals not exceeding 3 meters (10 feet)</p> Signup and view all the answers

    Which of the following is NOT a permitted use of FMC according to the text?

    <p>Tap connections to luminaires</p> Signup and view all the answers

    What is the maximum size of FMC that should not be used?

    <p>Trade size 4</p> Signup and view all the answers

    According to Table 348.22, how many insulated conductors of size 18 AWG are permitted inside FMC fittings outside conduit?

    <p>5</p> Signup and view all the answers

    What is the maximum number of degrees of bends allowed in a conduit run according to the text?

    <p>360 degrees</p> Signup and view all the answers

    According to Table 352.44(A), what is the change in length of a 100-foot run of PVC conduit if the temperature change is 100°F?

    <p>4.06 inches</p> Signup and view all the answers

    What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?

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

    According to the article, what is the maximum number of degrees of bends allowed in a conduit run?

    <p>180 degrees</p> Signup and view all the answers

    Which metric designator is the maximum size of LFMC allowed?

    <p>103</p> Signup and view all the answers

    What is the maximum number of degrees of bends allowed in a conduit run?

    <p>360 degrees</p> Signup and view all the answers

    What is the maximum interval at which LFMC should be supported and secured?

    <p>1.4 m (4.5 ft)</p> Signup and view all the answers

    What is the minimum bending radius for Type TC cable without metallic shielding?

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

    Which of the following is NOT a permitted use of LFMC according to the text?

    <p>Where conditions of installation, operation, or maintenance require flexibility or protection from machine oils, liquids, vapors, or solids</p> Signup and view all the answers

    What is the maximum temperature at which LFMC is intended to be used according to the text?

    <p>140°F</p> Signup and view all the answers

    In what locations is a bonding jumper required when using LFMC according to the text?

    <p>In hazardous (classified) locations</p> Signup and view all the answers

    What is the maximum length of LFMC permitted for direct burial in the earth according to the text?

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

    Which of the following is NOT a permitted use of PVC conduit according to the text?

    <p>Installation in hazardous (classified) locations</p> Signup and view all the answers

    What is the maximum size of PVC conduit that should not be used according to the text?

    <p>Trade size 6</p> Signup and view all the answers

    According to the text, what is the maximum number of degrees of bends allowed in a conduit run?

    <p>180 degrees</p> Signup and view all the answers

    Which of the following is a permitted use of PVC conduit according to the text?

    <p>Installation in dry and damp locations</p> Signup and view all the answers

    Which of the following is NOT an exception for the length of flexible metal conduit (FMC) permitted without securement and support?

    <p>Lengths not exceeding 1.8 m (6 ft) from the point where the FMC is securely fastened</p> Signup and view all the answers

    What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?

    <p>1.4 m (41⁄2 ft)</p> Signup and view all the answers

    What is the maximum size of flexible metal conduit (FMC) that should not be used?

    <p>90 (trade size 31⁄2)</p> Signup and view all the answers

    According to Table 352.30(B) of Chapter 9, what is the maximum spacing between supports for 21/2-inch PVC conduit?

    <p>2.1 m</p> Signup and view all the answers

    According to Table 352.44(A) of Chapter 9, what is the length change of PVC conduit in millimeters for a temperature change of 30°C?

    <p>1.83 mm/m</p> Signup and view all the answers

    According to the text, when should expansion fittings be provided for PVC conduit?

    <p>When the length change is expected to be 6 mm or greater</p> Signup and view all the answers

    According to the text, what is the coefficient of thermal expansion for PVC rigid nonmetallic conduit?

    <p>6.084 × 10^-5 mm/mm/°C</p> Signup and view all the answers

    According to the text, what is the maximum length that flexible metal conduit (FMC) can extend from the last point where it is securely fastened for metric designators 16 through 35 (trade sizes 1/2 through 1 1/4)?

    <p>900 mm</p> Signup and view all the answers

    According to the text, what is the maximum length that FMC can extend from the last point where it is securely fastened for metric designators 41 through 53 (trade sizes 1 1/2 through 2)?

    <p>1200 mm</p> Signup and view all the answers

    According to the text, what is the maximum length that FMC can extend from the last point where it is securely fastened for metric designator 63 (trade size 2 1/2) and larger?

    <p>1500 mm</p> Signup and view all the answers

    According to the text, what is the maximum length that FMC can extend from a luminaire terminal connection for tap conductors to luminaires?

    <p>1800 mm</p> Signup and view all the answers

    Which of the following is NOT a requirement for joints between lengths of conduit and fittings?

    <p>The joints must be made using an adhesive</p> Signup and view all the answers

    What is the purpose of a bushing or adapter when a conduit enters a box, fitting, or other enclosure?

    <p>To protect the wire from abrasion</p> Signup and view all the answers

    When is a separate grounding conductor required to be installed in a conduit for equipment grounding?

    <p>When the equipment is located outdoors</p> Signup and view all the answers

    Which of the following characteristics must PVC conduit have for use aboveground?

    <p>Resistance to low temperature and sunlight effects</p> Signup and view all the answers

    What are the requirements for PVC conduit to be used underground?

    <p>Resistance to moisture and corrosive agents</p> Signup and view all the answers

    How should each length of PVC conduit be marked?

    <p>With the type of material and special characteristics of the material</p> Signup and view all the answers

    Which of the following is NOT encompassed by the definition of raceway according to the text?

    <p>Auxiliary gutter</p> Signup and view all the answers

    What differentiates an auxiliary gutter from a wireway according to the text?

    <p>Field application</p> Signup and view all the answers

    Which NEC requirements do NOT apply to auxiliary gutters according to the text?

    <p>Requirements for raceways</p> Signup and view all the answers

    Which of the following is NOT a requirement for nonmetallic auxiliary gutters installed outdoors?

    <p>Listing for all of the above conditions</p> Signup and view all the answers

    What is the intended use of auxiliary gutters compared to wireways?

    <p>They are intended for different uses than wireways</p> Signup and view all the answers

    What is the maximum ambient temperature that nonmetallic auxiliary gutters installed indoors should be listed for?

    <p>The maximum ambient temperature of the installation</p> Signup and view all the answers

    Which of the following is NOT a requirement for nonmetallic auxiliary gutters installed outdoors?

    <p>There is no limit on the size of conductors that can be installed in an auxiliary gutter</p> Signup and view all the answers

    According to the text, what is the maximum number of degrees of bends allowed in a conduit run?

    <p>90 degrees</p> Signup and view all the answers

    Which of the following is a permitted use of PVC conduit according to the text?

    <p>To enclose power and control tray cable</p> Signup and view all the answers

    According to the text, what is the minimum clearance required between bare current-carrying metal parts of different voltages mounted on the same surface?

    <p>25 mm (1 in.)</p> Signup and view all the answers

    What is the maximum spacing allowed between fasteners (rivets, bolts, or screws) that hold the assembly of gutters together?

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

    What is the minimum clearance required between bare current-carrying metal parts and any metal surface?

    <p>25 mm (1 in.)</p> Signup and view all the answers

    What is the maximum ambient temperature that nonmetallic auxiliary gutters installed indoors should be listed for?

    <p>75°C (167°F)</p> Signup and view all the answers

    According to the text, what is the maximum percentage of the interior cross-sectional area of a sheet metal auxiliary gutter that can be filled with the sum of cross-sectional areas of all contained conductors and cables?

    <p>20 percent</p> Signup and view all the answers

    When do the adjustment factors in 310.15(C)(1) need to be applied for sheet metal auxiliary gutters?

    <p>When the number of current-carrying conductors exceeds 30 at any cross section</p> Signup and view all the answers

    What is the maximum amperes per square millimeter (A/mm2) of cross section that bare copper bars in sheet metal auxiliary gutters can carry continuously?

    <p>1.55 A/mm2</p> Signup and view all the answers

    What is the maximum amperes per square millimeter (A/mm2) of cross section that aluminum bars in sheet metal auxiliary gutters can carry continuously?

    <p>1.09 A/mm2</p> Signup and view all the answers

    Which of the following is NOT a type of cable tray system mentioned in Article 392?

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

    What is the permitted use of cable tray installations according to Article 392?

    <p>Both industrial and commercial facilities</p> Signup and view all the answers

    According to Article 392, when are single insulated cables and single insulated conductors permitted in cable tray?

    <p>Only when installed in accordance with 392.10(B)(1)</p> Signup and view all the answers

    According to the text, what is the maximum spacing allowed between fasteners (rivets, bolts, or screws) that hold the assembly of cable trays together?

    <p>24 inches</p> Signup and view all the answers

    Which of the following is NOT a requirement for cable trays installed in wet or dry locations?

    <p>Mechanically continuous</p> Signup and view all the answers

    According to the text, what is the maximum length that flexible metal conduit (FMC) can extend from the last point where it is securely fastened for metric designators 16 through 35 (trade sizes 1/2 through 1 1/4)?

    <p>5 feet</p> Signup and view all the answers

    Which of the following is a permitted use of PVC conduit according to the text?

    <p>Underground installations</p> Signup and view all the answers

    According to Table 392.22(A)(5), what is the maximum allowable fill area for multiconductor cables in ventilated channel cable trays with an inside width of 75 mm?

    <p>1600 mm²</p> Signup and view all the answers

    When solid channel cable trays contain multiconductor cables of any type, which subsections of 392.22(A)(6) apply?

    <p>392.22(A)(6)(a) and (A)(6)(b)</p> Signup and view all the answers

    According to the text, what is the maximum cross-sectional area of a single multiconductor cable that can be installed in a solid channel cable tray?

    <p>2900 mm²</p> Signup and view all the answers

    According to the text, what is the maximum allowable rung spacing for ladder cable tray when installing 1/0 AWG through 4/0 AWG single-conductor cables and single insulated conductors?

    <p>225 mm (9 in.)</p> Signup and view all the answers

    Which type of cable is permitted to be installed in cable trays in hazardous (classified) locations?

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

    According to the text, when is nonmetallic cable tray permitted to be used?

    <p>In addition to the uses permitted elsewhere in the NEC</p> Signup and view all the answers

    What is the maximum voltage rating for airfield lighting cable used in series circuits that are powered by constant current regulators?

    <p>5000 volts</p> Signup and view all the answers

    According to the text, what is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?

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

    According to the text, what is the maximum allowable fill area for multiconductor cables in ladder or ventilated trough cable trays for cables rated 2000 volts or less with a cable tray width of 50 mm?

    <p>1500 mm2</p> Signup and view all the answers

    According to the text, what is the maximum allowable fill area for multiconductor cables in ladder or ventilated trough cable trays for cables rated 2000 volts or less with a cable tray width of 100 mm?

    <p>4000 mm2</p> Signup and view all the answers

    According to the text, what is the maximum length that flexible metal conduit (FMC) can extend from the last point where it is securely fastened for metric designators 16 through 35 (trade sizes 1/2 through 1 1/4)?

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

    According to the text, what is the maximum allowable fill in mm² for a 150-mm wide cable tray in Column 2?

    <p>$4500 - (30 \cdot Sd)$</p> Signup and view all the answers

    What is the maximum number of degrees of bends allowed in a conduit run according to the text?

    <p>$180$</p> Signup and view all the answers

    Which type of cable tray has a usable inside depth of 150 mm (6 in.) or less and contains multiconductor control and/or signal cables only?

    <p>Solid Bottom Cable Trays</p> Signup and view all the answers

    What is the maximum number of cables permitted in solid bottom cable trays where all of the cables are smaller than 4/0 AWG?

    <p>The sum of the cross-sectional areas of all cables shall not exceed the maximum allowable cable fill area in Column 3 of Table 392.22(A)(1) for the appropriate cable tray width</p> Signup and view all the answers

    According to the text, what is the maximum number of single conductor cables, rated 2000 volts or less, permitted in a single cable tray section for ladder or ventilated trough cable trays?

    <p>4</p> Signup and view all the answers

    According to the text, what is the maximum sum of the cross-sectional areas of all single-conductor cables, rated 2000 volts or less, allowed in a cable tray with a width of 150 mm?

    <p>5500 mm²</p> Signup and view all the answers

    According to the text, what is the maximum sum of the cross-sectional areas of all multiconductor cables, rated 2000 volts or less, allowed in a solid channel cable tray with a width of 100 mm?

    <p>2400 mm²</p> Signup and view all the answers

    Which type of cable is permitted to be installed in cable trays in hazardous (classified) locations?

    <p>Type TC-ER cable</p> Signup and view all the answers

    What is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?

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

    According to the text, what is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?

    <p>600 mm</p> Signup and view all the answers

    According to the text, what is the maximum allowable fill area for multiconductor cables in ladder or ventilated trough cable trays for cables rated 2000 volts or less with a cable tray width of 100 mm?

    <p>350 mm²</p> Signup and view all the answers

    According to the text, what is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?

    <p>Not more than four</p> Signup and view all the answers

    What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?

    <p>2.4 m (8 ft)</p> Signup and view all the answers

    According to the text, what is the maximum allowable fill in mm² for a 150-mm wide cable tray in Column 2?

    <p>700 mm²</p> Signup and view all the answers

    According to Table 348.22, how many insulated conductors of size 18 AWG are permitted inside FMC fittings outside conduit?

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

    According to the text, what is the maximum allowable fill area for single-conductor cables in a 150-mm wide cable tray?

    <p>4,200 mm2</p> Signup and view all the answers

    What is the maximum sum of the diameters of all single conductor cables allowed in a ventilated channel cable tray that is 75 mm (3 in.) wide?

    <p>75 mm</p> Signup and view all the answers

    What is the maximum distance allowed between cable trays or between a cable tray and a raceway or equipment, when single conductor cables pass from one cable tray to another or to a raceway or equipment?

    <p>1.8 m (6 ft)</p> Signup and view all the answers

    What is the maximum number of cables rated 2001 volts or over permitted in a single cable tray?

    <p>Not specified in the text</p> Signup and view all the answers

    According to Table 392.60(B), what is the minimum cross-sectional area of metal for steel cable trays with a maximum fuse ampere rating of 600?

    <p>645 mm2</p> Signup and view all the answers

    According to the text, when can cable tray systems be used as the required equipment grounding conductor?

    <p>When the cable tray system meets the requirements of 392.60(A) and (B)</p> Signup and view all the answers

    According to 392.80(A)(1)(a), when do the adjustment factors of 310.15(C)(1) apply to multiconductor cables?

    <p>When the multiconductor cables have more than three current-carrying conductors</p> Signup and view all the answers

    According to 250.96(A), where must bonding conductors be installed in the cable tray system?

    <p>Across any mechanical discontinuities and across any space between the cable tray and the conductor termination equipment enclosure or its equipment ground bus</p> Signup and view all the answers

    Which of the following is true about the ampacity of multiconductor cables installed in a single layer in uncovered cable trays, with maintained spacing of not less than one cable diameter between cables?

    <p>The ampacity shall not exceed the allowable ampacities of Table 315.60(C)(5) and Table 315.60(C)(6)</p> Signup and view all the answers

    What is the maximum allowable fill for multiconductor cables in ladder or ventilated trough cable trays for cables rated 2000 volts or less with a cable tray width of 50 mm?

    <p>Not more than 20 percent</p> Signup and view all the answers

    What is the maximum amperes per square millimeter (A/mm²) of cross section that bare copper bars in sheet metal auxiliary gutters can carry continuously?

    <p>2.5 A/mm²</p> Signup and view all the answers

    What is the maximum length that flexible metal conduit (FMC) can extend from the last point where it is securely fastened for metric designators 16 through 35 (trade sizes 1/2 through 1 1/4)?

    <p>1.8 m (6 ft)</p> Signup and view all the answers

    Which consensus standard provides additional information on outdoor overhead conductors over 1000 volts?

    <p>National Electrical Safety Code</p> Signup and view all the answers

    What is the scope of Article 395?

    <p>Covers use and installation for outdoor overhead conductors over 1000 volts</p> Signup and view all the answers

    What type of conductors are permitted outdoors for systems rated over 1000 volts?

    <p>Service conductors, feeders, or branch circuits</p> Signup and view all the answers

    Which material(s) should be considered when designing support structures for overhead conductors over 1000 volts?

    <p>Wood, metal, and concrete</p> Signup and view all the answers

    Which of the following factors should be considered when designing support structures for overhead conductors?

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

    Which of the following is a requirement for insulators used to support conductors?

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

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