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Questions and Answers
According to the article, what is the basic standard to investigate power and control tray cable?
According to the article, what is the basic standard to investigate power and control tray cable?
Where can you find summary information regarding listed power and control tray cable?
Where can you find summary information regarding listed power and control tray cable?
According to the article, what are the permitted uses of Type TC cable?
According to the article, what are the permitted uses of Type TC cable?
Which type of cable is permitted to extend from a cable tray to a piece of equipment without the use of conduit?
Which type of cable is permitted to extend from a cable tray to a piece of equipment without the use of conduit?
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What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
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What is the minimum bending radius for Type TC cable without metallic shielding?
What is the minimum bending radius for Type TC cable without metallic shielding?
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How is the ampacity of Type TC tray cable determined for 18 AWG through 16 AWG conductors installed in cable trays?
How is the ampacity of Type TC tray cable determined for 18 AWG through 16 AWG conductors installed in cable trays?
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Which types of conductors are suitable for branch circuit and feeder circuits?
Which types of conductors are suitable for branch circuit and feeder circuits?
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What is the minimum conductor size for control and signal conductors?
What is the minimum conductor size for control and signal conductors?
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What type of cable should be used for thermocouple circuits?
What type of cable should be used for thermocouple circuits?
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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?
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?
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Under what conditions is aluminum RMC permitted to be installed?
Under what conditions is aluminum RMC permitted to be installed?
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What types of ferrous raceways and fittings are permitted to be installed indoors and in occupancies not subject to severe corrosive influences?
What types of ferrous raceways and fittings are permitted to be installed indoors and in occupancies not subject to severe corrosive influences?
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According to 348.30(A), how far should FMC be securely fastened in place from each box, cabinet, conduit body, or other conduit termination?
According to 348.30(A), how far should FMC be securely fastened in place from each box, cabinet, conduit body, or other conduit termination?
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What is the maximum interval at which FMC should be supported and secured?
What is the maximum interval at which FMC should be supported and secured?
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Which exception allows for the use of FMC without supporting it in certain situations?
Which exception allows for the use of FMC without supporting it in certain situations?
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Which materials are permitted to be installed in or under cinder fill where subject to permanent moisture?
Which materials are permitted to be installed in or under cinder fill where subject to permanent moisture?
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Which metals should be avoided in contact with each other to eliminate the possibility of galvanic action?
Which metals should be avoided in contact with each other to eliminate the possibility of galvanic action?
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Which combination of metals shows minor galvanic corrosion at their interfaces?
Which combination of metals shows minor galvanic corrosion at their interfaces?
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What is the maximum size of RMC that should not be used?
What is the maximum size of RMC that should not be used?
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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?
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?
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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?
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?
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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?
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?
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Which type of conduit is permitted as an equipment grounding conductor?
Which type of conduit is permitted as an equipment grounding conductor?
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Which one of the following is true about the radius of the curve of a field bend in a conduit?
Which one of the following is true about the radius of the curve of a field bend in a conduit?
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Which one of the following is true about the total degrees of bends in a conduit run?
Which one of the following is true about the total degrees of bends in a conduit run?
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Which one of the following is true about reaming and threading of conduit cut ends?
Which one of the following is true about reaming and threading of conduit cut ends?
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Which one of the following is true about securing and supporting RMC conduit?
Which one of the following is true about securing and supporting RMC conduit?
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Which of the following is NOT a permitted use of FMC according to the text?
Which of the following is NOT a permitted use of FMC according to the text?
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What is the maximum size of FMC that should not be used?
What is the maximum size of FMC that should not be used?
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According to Table 348.22, how many insulated conductors of size 18 AWG are permitted inside FMC fittings outside conduit?
According to Table 348.22, how many insulated conductors of size 18 AWG are permitted inside FMC fittings outside conduit?
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What is the maximum number of degrees of bends allowed in a conduit run according to the text?
What is the maximum number of degrees of bends allowed in a conduit run according to the text?
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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?
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?
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What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
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According to the article, what is the maximum number of degrees of bends allowed in a conduit run?
According to the article, what is the maximum number of degrees of bends allowed in a conduit run?
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Which metric designator is the maximum size of LFMC allowed?
Which metric designator is the maximum size of LFMC allowed?
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What is the maximum number of degrees of bends allowed in a conduit run?
What is the maximum number of degrees of bends allowed in a conduit run?
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What is the maximum interval at which LFMC should be supported and secured?
What is the maximum interval at which LFMC should be supported and secured?
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What is the minimum bending radius for Type TC cable without metallic shielding?
What is the minimum bending radius for Type TC cable without metallic shielding?
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Which of the following is NOT a permitted use of LFMC according to the text?
Which of the following is NOT a permitted use of LFMC according to the text?
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What is the maximum temperature at which LFMC is intended to be used according to the text?
What is the maximum temperature at which LFMC is intended to be used according to the text?
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In what locations is a bonding jumper required when using LFMC according to the text?
In what locations is a bonding jumper required when using LFMC according to the text?
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What is the maximum length of LFMC permitted for direct burial in the earth according to the text?
What is the maximum length of LFMC permitted for direct burial in the earth according to the text?
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Which of the following is NOT a permitted use of PVC conduit according to the text?
Which of the following is NOT a permitted use of PVC conduit according to the text?
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What is the maximum size of PVC conduit that should not be used according to the text?
What is the maximum size of PVC conduit that should not be used according to the text?
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According to the text, what is the maximum number of degrees of bends allowed in a conduit run?
According to the text, what is the maximum number of degrees of bends allowed in a conduit run?
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Which of the following is a permitted use of PVC conduit according to the text?
Which of the following is a permitted use of PVC conduit according to the text?
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Which of the following is NOT an exception for the length of flexible metal conduit (FMC) permitted without securement and support?
Which of the following is NOT an exception for the length of flexible metal conduit (FMC) permitted without securement and support?
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What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
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What is the maximum size of flexible metal conduit (FMC) that should not be used?
What is the maximum size of flexible metal conduit (FMC) that should not be used?
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According to Table 352.30(B) of Chapter 9, what is the maximum spacing between supports for 21/2-inch PVC conduit?
According to Table 352.30(B) of Chapter 9, what is the maximum spacing between supports for 21/2-inch PVC conduit?
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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?
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?
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According to the text, when should expansion fittings be provided for PVC conduit?
According to the text, when should expansion fittings be provided for PVC conduit?
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According to the text, what is the coefficient of thermal expansion for PVC rigid nonmetallic conduit?
According to the text, what is the coefficient of thermal expansion for PVC rigid nonmetallic conduit?
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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)?
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)?
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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)?
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)?
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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?
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?
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According to the text, what is the maximum length that FMC can extend from a luminaire terminal connection for tap conductors to luminaires?
According to the text, what is the maximum length that FMC can extend from a luminaire terminal connection for tap conductors to luminaires?
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Which of the following is NOT a requirement for joints between lengths of conduit and fittings?
Which of the following is NOT a requirement for joints between lengths of conduit and fittings?
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What is the purpose of a bushing or adapter when a conduit enters a box, fitting, or other enclosure?
What is the purpose of a bushing or adapter when a conduit enters a box, fitting, or other enclosure?
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When is a separate grounding conductor required to be installed in a conduit for equipment grounding?
When is a separate grounding conductor required to be installed in a conduit for equipment grounding?
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Which of the following characteristics must PVC conduit have for use aboveground?
Which of the following characteristics must PVC conduit have for use aboveground?
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What are the requirements for PVC conduit to be used underground?
What are the requirements for PVC conduit to be used underground?
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How should each length of PVC conduit be marked?
How should each length of PVC conduit be marked?
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Which of the following is NOT encompassed by the definition of raceway according to the text?
Which of the following is NOT encompassed by the definition of raceway according to the text?
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What differentiates an auxiliary gutter from a wireway according to the text?
What differentiates an auxiliary gutter from a wireway according to the text?
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Which NEC requirements do NOT apply to auxiliary gutters according to the text?
Which NEC requirements do NOT apply to auxiliary gutters according to the text?
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Which of the following is NOT a requirement for nonmetallic auxiliary gutters installed outdoors?
Which of the following is NOT a requirement for nonmetallic auxiliary gutters installed outdoors?
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What is the intended use of auxiliary gutters compared to wireways?
What is the intended use of auxiliary gutters compared to wireways?
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What is the maximum ambient temperature that nonmetallic auxiliary gutters installed indoors should be listed for?
What is the maximum ambient temperature that nonmetallic auxiliary gutters installed indoors should be listed for?
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Which of the following is NOT a requirement for nonmetallic auxiliary gutters installed outdoors?
Which of the following is NOT a requirement for nonmetallic auxiliary gutters installed outdoors?
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According to the text, what is the maximum number of degrees of bends allowed in a conduit run?
According to the text, what is the maximum number of degrees of bends allowed in a conduit run?
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Which of the following is a permitted use of PVC conduit according to the text?
Which of the following is a permitted use of PVC conduit according to the text?
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According to the text, what is the minimum clearance required between bare current-carrying metal parts of different voltages mounted on the same surface?
According to the text, what is the minimum clearance required between bare current-carrying metal parts of different voltages mounted on the same surface?
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What is the maximum spacing allowed between fasteners (rivets, bolts, or screws) that hold the assembly of gutters together?
What is the maximum spacing allowed between fasteners (rivets, bolts, or screws) that hold the assembly of gutters together?
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What is the minimum clearance required between bare current-carrying metal parts and any metal surface?
What is the minimum clearance required between bare current-carrying metal parts and any metal surface?
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What is the maximum ambient temperature that nonmetallic auxiliary gutters installed indoors should be listed for?
What is the maximum ambient temperature that nonmetallic auxiliary gutters installed indoors should be listed for?
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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?
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?
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When do the adjustment factors in 310.15(C)(1) need to be applied for sheet metal auxiliary gutters?
When do the adjustment factors in 310.15(C)(1) need to be applied for sheet metal auxiliary gutters?
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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?
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?
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What is the maximum amperes per square millimeter (A/mm2) of cross section that aluminum bars in sheet metal auxiliary gutters can carry continuously?
What is the maximum amperes per square millimeter (A/mm2) of cross section that aluminum bars in sheet metal auxiliary gutters can carry continuously?
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Which of the following is NOT a type of cable tray system mentioned in Article 392?
Which of the following is NOT a type of cable tray system mentioned in Article 392?
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What is the permitted use of cable tray installations according to Article 392?
What is the permitted use of cable tray installations according to Article 392?
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According to Article 392, when are single insulated cables and single insulated conductors permitted in cable tray?
According to Article 392, when are single insulated cables and single insulated conductors permitted in cable tray?
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According to the text, what is the maximum spacing allowed between fasteners (rivets, bolts, or screws) that hold the assembly of cable trays together?
According to the text, what is the maximum spacing allowed between fasteners (rivets, bolts, or screws) that hold the assembly of cable trays together?
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Which of the following is NOT a requirement for cable trays installed in wet or dry locations?
Which of the following is NOT a requirement for cable trays installed in wet or dry locations?
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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)?
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)?
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Which of the following is a permitted use of PVC conduit according to the text?
Which of the following is a permitted use of PVC conduit according to the text?
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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?
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?
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When solid channel cable trays contain multiconductor cables of any type, which subsections of 392.22(A)(6) apply?
When solid channel cable trays contain multiconductor cables of any type, which subsections of 392.22(A)(6) apply?
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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?
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?
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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?
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?
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Which type of cable is permitted to be installed in cable trays in hazardous (classified) locations?
Which type of cable is permitted to be installed in cable trays in hazardous (classified) locations?
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According to the text, when is nonmetallic cable tray permitted to be used?
According to the text, when is nonmetallic cable tray permitted to be used?
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What is the maximum voltage rating for airfield lighting cable used in series circuits that are powered by constant current regulators?
What is the maximum voltage rating for airfield lighting cable used in series circuits that are powered by constant current regulators?
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According to the text, what is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?
According to the text, what is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?
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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?
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?
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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?
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?
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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)?
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)?
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According to the text, what is the maximum allowable fill in mm² for a 150-mm wide cable tray in Column 2?
According to the text, what is the maximum allowable fill in mm² for a 150-mm wide cable tray in Column 2?
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What is the maximum number of degrees of bends allowed in a conduit run according to the text?
What is the maximum number of degrees of bends allowed in a conduit run according to the text?
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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?
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?
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What is the maximum number of cables permitted in solid bottom cable trays where all of the cables are smaller than 4/0 AWG?
What is the maximum number of cables permitted in solid bottom cable trays where all of the cables are smaller than 4/0 AWG?
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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?
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?
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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?
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?
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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?
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?
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Which type of cable is permitted to be installed in cable trays in hazardous (classified) locations?
Which type of cable is permitted to be installed in cable trays in hazardous (classified) locations?
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What is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?
What is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?
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According to the text, what is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
According to the text, what is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
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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?
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?
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According to the text, what is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?
According to the text, what is the maximum number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray?
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What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
What is the maximum distance that Type TC-ER cable is permitted to exit a cable tray without continuous support?
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According to the text, what is the maximum allowable fill in mm² for a 150-mm wide cable tray in Column 2?
According to the text, what is the maximum allowable fill in mm² for a 150-mm wide cable tray in Column 2?
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According to Table 348.22, how many insulated conductors of size 18 AWG are permitted inside FMC fittings outside conduit?
According to Table 348.22, how many insulated conductors of size 18 AWG are permitted inside FMC fittings outside conduit?
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According to the text, what is the maximum allowable fill area for single-conductor cables in a 150-mm wide cable tray?
According to the text, what is the maximum allowable fill area for single-conductor cables in a 150-mm wide cable tray?
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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?
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?
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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?
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?
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What is the maximum number of cables rated 2001 volts or over permitted in a single cable tray?
What is the maximum number of cables rated 2001 volts or over permitted in a single cable tray?
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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?
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?
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According to the text, when can cable tray systems be used as the required equipment grounding conductor?
According to the text, when can cable tray systems be used as the required equipment grounding conductor?
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According to 392.80(A)(1)(a), when do the adjustment factors of 310.15(C)(1) apply to multiconductor cables?
According to 392.80(A)(1)(a), when do the adjustment factors of 310.15(C)(1) apply to multiconductor cables?
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According to 250.96(A), where must bonding conductors be installed in the cable tray system?
According to 250.96(A), where must bonding conductors be installed in the cable tray system?
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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?
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?
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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?
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?
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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?
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?
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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)?
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)?
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Which consensus standard provides additional information on outdoor overhead conductors over 1000 volts?
Which consensus standard provides additional information on outdoor overhead conductors over 1000 volts?
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What is the scope of Article 395?
What is the scope of Article 395?
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What type of conductors are permitted outdoors for systems rated over 1000 volts?
What type of conductors are permitted outdoors for systems rated over 1000 volts?
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Which material(s) should be considered when designing support structures for overhead conductors over 1000 volts?
Which material(s) should be considered when designing support structures for overhead conductors over 1000 volts?
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Which of the following factors should be considered when designing support structures for overhead conductors?
Which of the following factors should be considered when designing support structures for overhead conductors?
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Which of the following is a requirement for insulators used to support conductors?
Which of the following is a requirement for insulators used to support conductors?
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