Independent Electrical Contractors (IEC) Y2S1 Part 3 Practice Test

These questions are part of the practice quiz. Start practicing

• What is the smallest size junction box for the specified installation with multiple conductors?
• Except where specifically referenced elsewhere in the Code, Article 312 does not apply to equipment operating at over ___ volts.
• When using cable assemblies with nonmetallic sheaths, the sheath must extend at least:
• What NEC code reference allows the use of steel threaded rigid couplings with aluminum rigid metal conduit?
• Type FCC cable is specifically designed for installations under ___.
• How should the temperature rating of a conductor be matched to its application?
• What is the maximum distance allowed between the first and second supports for LFNC in a string of luminaires spaced 6 feet apart?
• What is the minimum depth required from the top of the conduit to the top of the sidewalk for a flush-mounted well light?
• What is the minimum calculated height dimension for a specified pull box?
• Which suffix designates two or more insulated conductors laid parallel within a cable?
• When a conduit passes through an exterior wall, what is required according to the NEC®?
• What is the maximum number of 2/0 AWG THHN/THWN conductors that can be installed in an 8" x 8" wireway?
• What is the maximum conductor size allowed in a cellular concrete floor raceway without special permission?
• What can be utilized to ensure conductors are protected in boxes, as per the NEC® regulations?
• What type of receptacle is included in the smallest box assembly with specified wiring?
• For a 30-foot run of conduit containing two conductors, what is the maximum area that can be occupied by the conductors?
• Type TC power and control cable may be used ___.
• Which 2 AWG conductor has a lower resistance?
• What is a key feature of Type TC cable?
• When a single-gang nonmetallic outlet box does not have a clamp or connector, what is the maximum distance permitted between the box and the first strap in a NM cable installation?
• The minimum bending radius of Type P cable shall be:
• Where splices, angle or U pulls are made, the distance between each raceway entry inside the box and the opposite wall shall not be less than ___ times the trade size of the largest raceway, plus the trade size of all other raceways entering on the same wall in the same row.
• SE cable used to supply ___ shall not be subject to conductor temperatures in excess of the temperature specified for the type of insulation involved.
• A flexible cord connection is made directly to the load end terminals of a busway plug-in device. What is the maximum length of this cord to a tension take-up device?
• When several AC, MC, or NMC cables are bundled together, what happens to the current-carrying capacity compared to when they are separated?
• Why is it important to define the temperature rating of a conductor?
• When comparing the 6 AWG and 8 AWG conductors, which has a smaller diameter?
• When is it permissible to use a round box in electrical installations?
• What is the main purpose of using reamed ends in rigid conduit?
• What is the minimum dimension permitted for the wiring method involving Schedule 40 PVC beneath a grassy area?
• For a copper conductor, which has a higher ampacity at the same length and conditions?
• An steel metal cable tray that is to be used as an equipment grounding conductor must have a cross-sectional area of how many square inches if conductors are protected by a 100A circuit breaker?
• To what does the term 'cross-sectional area' refer in electrical systems?
• What must be done to all cut ends of rigid conduit?
• Busways shall be permitted to be extended vertically through dry floors if totally enclosed (unventilated) where passing through and for a minimum distance of how many feet above the floor?
• What must be done before working on or inside a transformer?
• When installing multiple conductors, a professional electrician must consider what requirement primarily?
• For 4/0 AWG conductors connected to non-removable lugs, what is the minimum wire bending space required?
• What does a circular mil measure in electrical conductors?
• What is the primary purpose of the equipment grounding conductor?
• What is the minimum distance to maintain between conductors and a raceway entry for larger pulls?
• What characteristic is essential for non-metallic sheathed cables used in flexible conduits?
• What is the required racked or cabled method for conductors in any box with a dimension greater than ___ ft?
• What is the minimum AWG size for conductors in cablebus?
• Which wiring method is used beneath a grassy area for a 120-volt circuit?
• Which of the following conductor arrangements is permitted by the NEC®?
• What is the minimum wire bending space required at a lay-in type lug connection for 4/0 AWG conductors?
• What type of protection is essential when conducting work near energized circuits?
• What is the maximum conduit length from the finish surface to the box that does not require additional support for RMC installations?
• When installing more than two conductors in a 50 foot run of 3-inch intermediate metal conduit, the maximum area that can be filled with conductors is ______ square inches.
• Which conductor type is suitable for use in a damp location?
• Why is it important to ensure that conductors in parallel are of the same length?
• What is the minimum distance from the nearest edge of the wood member that holes for wiring methods should be bored?
• What is the required minimum height for a pull box calculated based on specific conduits, as mentioned in the regulations?
• What type of wire is commonly used for direct-burial applications?
• How much minimum wire bending space is required for 350 kcmil conductors?
• What is the minimum wire bending space required for 350 kcmil conductors at a lay-in type lug connection?
• What is the minimum standard size wireway required for one hundred #8 THHN/THWN conductors?
• What is the minimum conductor size that can be spliced inside an LB conduit body?
• What is a common feature required for installation of outdoor electrical devices?
• How should conduits be supported when there is no mechanical damage expected?
• What is the calculated minimum width of the pull box shown in the reference figure?
• What type of cable is recommended for damp locations?
• When NM cable is run on the surface of ___ facing the attic, the cables require protection from physical damage by using substantial guard strips.
• What should nonmetallic boxes be suitable for concerning the lowest conductor?
• What is the largest conductor permitted in 3/8" flexible conduit?
• What should be ensured when installing cabinets and cutout boxes according to the NEC?
• Which installation method minimizes corrosion in exposed wiring?
• When installing #1 RHH conductors in a conduit, each conductor has a value of ____ when calculating conduit fill.
• What is the minimum calculated dimension for "height" in inches for a pull box where all conductors enter the right size and exit the bottom?
• When a device box contains a duplex receptacle, a ____ volume allowance is to be counted for the device.
• Before working on a transformer, which safety standards must you follow?
• When should nonmetallic conduits be avoided?
• For straight pulls of 2 AWG conductors through a junction box, the length of the box shall be at least ___ times the size of the largest raceway.
• Where two internal cable clamps are present in a box, a ___ conductor volume allowance will be counted towards the box fill calculation, based on the largest conductor in the box.
• Which trade size 1-1/4 raceway has the smallest cross-sectional area?
• The ampacity of types NM and NMC cable shall be that of ___ degree C conductors.
• What percent of a metal wireway cross section may be occupied by splices, taps, and conductors at any point?
• Which gauge of conductors is mentioned as entering and exiting the pull box?
• What is the volume of the smallest metal box with specific cable combinations?
• What is the minimum cubic inch volume required for a two-gang box that contains specific NM cables and clamps?
• According to NEC®, unused knockouts and other openings in electrical boxes and cabinets are required to be closed.
• What is the purpose of installing an overcurrent device in an electrical installation?
• A flexible cord connection is made directly to the load end terminals of a busway plug-in device. What is the maximum length of this cord to a tension take-up device?
• Which of the statements below is true?
• For a raceway system, what is generally the main reason for considering wall thickness?
• The flexible wiring method between the time clock and the panel is permitted to be:
• What is the primary purpose of the NEC® when it comes to electrical installations?
• What advantage does RMC have in terms of physical support when installed correctly?
• What is the smallest size permitted for branch circuit conductors supplying appliances other than cooking appliances?
• What type of connector is used for the exterior conductors in the junction box description?
• What should be checked to ensure safe working conditions on a transformer?
• How many 2/0 AWG THHN/THWN conductors can be installed in a 14" section of trade size 3 1/2 Schedule 40 PVC?
• In straight pulls, the length of the box must be at least how many times the trade diameter of the largest raceway for conductors?
• Ceiling-suspended (paddle) fans are required to be installed on:
• Live parts to which an employee may be exposed shall be what?
• Which regulatory body primarily oversees electrical safety standards?
• A wall-mounted luminaire that weighs 4 pounds is permitted to be mounted to and supported by:
• In which type of constructed wall or ceiling is it acceptable for the front edge of the box to be set back as much as 1/4 inch from the finish surface?
• What is the maximum number of bends allowed in a conduit run per NEC requirements?
• For which of the following electrical installations is it appropriate to use nonmetallic sheathed cable?
• What minimum size schedule 80 PVC conduit is required for a 65' run containing specific conductors?
• What is the requirement for connecting metal raceways according to NEC®?
• What is the degree Celsius rating for Type THW insulation when used in wiring through fixtures?
• If six 250 kcmil conductors are housed in a pipe at 129°F, what is the maximum current each can carry?
• Angle pull dimensional requirements are applicable to junction boxes only when conductors are equal to or larger than what gauge?
• A 300-foot run of 800-amp busway is installed in a commercial warehouse building. The last 20' of the busway run is reduced to a bus rating of 200 amps. What is the requirement for installation of the smaller bus?
• For messenger-supported wiring, how should conductors enter the box?
• The parallel conductors in each phase or neutral shall ___.
• In a wall made of noncombustible material, cabinets must not be set back more than ____ from the finished surface.
• Outlet boxes that do not enclose devices or utilization equipment must have a minimum internal depth of:
• Which statement is true regarding the differences between Schedule 40 and Schedule 80 PVC?
• The overall diameter of a 1/0 bare stranded copper conductor is ____ inches.
• In no case shall conductors in cablebus be smaller than _____ AWG.
• In the event of needing flexible conduit for a short stretch, what is the maximum permissible length before supports are required?
• What component is required for installation to indicate the presence of underground wiring?
• What is the minimum cubic inch volume required for a two-gang box containing two 12/2 AWG w/ground NM cables and two 14/2 AWG w/ground NM cables connected to devices?
• What is the minimum trade size RMC permitted to be installed between two panelboards that are 5 feet apart?
• Which single conductor in an AC system is permitted to be installed by itself in a metallic raceway?
• For which type of installation is SE cable primarily intended?
• What shall be used to warn employees about electrical hazards that may endanger them?
• Which type of cable is designed to be resistant to the growth of fungus?
• What does the 'D' suffix in conductor insulation type signify?
• The conductors, including splices and taps in metal surface raceway shall not fill the raceway to more than what percent of its area at that point?
• How must all metal raceways, fittings, and enclosures be connected according to NEC®?
• For a raceway with 30 current-carrying conductors, to what percent of single conductor ampacity should the ampacity of each conductor be reduced?
• In which situation would additional supports be required according to NEC standards?
• Dual-rated THHN/THWN conductors can be installed in which of the following locations?
• What type of cable tray is commonly used as an equipment grounding conductor?
• What is the main function of a GFCI breaker in a circuit?
• What is the minimum dimension permitted for Y when IMC is the wiring method installed beneath a grassy area?
• The circular mil area of a 10 AWG bare copper conductor is approximately how many cmils?
• The nominal gas pressure for IGS cable insulation shall be ___ pounds per square inch gauge.
• The minimum required depth for an outlet box that will support a device but does not enclose any conductors is:
• In what conditions are cabinets to be installed according to safety guidelines?
• What is the insulation temperature rating of type THWN wire when installed in a wet location?
• Which section of the NEC® allows for the installation of nonmetallic outlet and device boxes with nonmetallic sheathed cable?
• Which section of the NEC® indicates that outlet and device boxes must be deep enough to prevent damage to conductors?
• Which conductor size is the maximum allowed in cellular metal floor raceways without special permission?
• Among the conductors listed below, all except ___ are permitted to be connected in parallel.
• Which of the following conductor insulations provides the best resistance to heat?
• Where are ceiling-suspended (paddle) fans required to be installed?
• Transformers should not be connected to circuits exceeding what percentage above the nameplate rating?
• High Density Polyethylene conduit larger than ____ shall not be used.
• Who is permitted to install and service transformers?
• Which type of raceway provides the best overall protection for conductors?
• How thick is the insulation of XHHW 500 kcmil conductors?
• The DC resistance @ 167 degrees F for a 2/0 AWG bare aluminum conductor would be ____ ohms per thousand feet of conductor.
• What should be done to all cut ends of rigid conduit?
• What type of conductors are enclosed in the described raceway?
• The current carried continuously in bare copper bars in auxiliary gutters shall not exceed how many amperes per square inch?
• When using non-removable lugs for 350 kcmil conductors, what is the required minimum wire bending space?
• When multiple conductors are bundled together, what happens to their current-carrying capacity?
• When referring to wireway capacities, what is usually the metric used to determine fill limits?
• What is the maximum temperature rating of a THHN conductor in a dry location?
• What must be the condition of conductors in raceways according to NEC®?
• What is the primary purpose of using PPE in electrical work environments?
• Conductor fill may be up to what percent of the cross-sectional area in underfloor raceways?
• Which of the following materials can be used to protect a Grounding Electrode Conductor (GEC) from physical damage?
• What is the minimum bend radius for 1 in. diameter corrugated sheath MC cable?
• Splices and taps shall be permitted in surface nonmetallic raceways having a removable cover that is accessible after installation. The conductors, including splices and taps, shall not fill the raceway to more than what percent of its area at that point?
• How far must cable, raceway, or box be installed from the lowest surface of metal-corrugated sheet roof decking?
• Which of the following may not be used in damp or wet locations?
• What is the ampacity of a 1/0 TW copper conductor?
• Which sort of connectors can be used for connecting MC cables to the box mentioned in the circuit plan?
• Which of the following statements about the protection of nonmetallic sheathed cable from physical damage is correct?
• In wiring installations, how is Type NM cable classified regarding its insulation?
• According to NEC, which condition justifies the use of conduit fittings?
• What must the front edge of a cabinet be flush with, according to installation practices?
• What is a critical factor in determining the compatibility of raceways?
• How should the surfaces on which flexible cords bear be designed according to the outlet box guidelines?
• According to NEC regulations, a 12' run of 2-1/2 inch FMC with a total area of 4.909 in² can have what maximum area occupied by circuit conductors?
• According to the NEC®, how many bends are allowed in a conduit run between two junction boxes?
• Except where specifically referenced elsewhere, Article 312 does not apply to equipment operating at over ___ volts.
• What is the smallest size of THHN/THWN copper conductor allowed for a 150 A feeder to a subpanel?
• Which of the following can be used to protect a Grounding Electrode Conductor (GEC) from physical damage?
• According to the NEC®, what is the smallest size permitted for branch circuit conductors suitable for supplying non-cooking appliances?
• When calculating the conductor fill for strut-type channel raceway with external joiners, the raceway shall be permitted to be filled to which percent of the cross-sectional area?
• In the context of wiring methods, what does IMC stand for?
• Mineral-insulated, metal-sheathed cable shall be supported and secured at intervals not exceeding ____.
• Under what condition can the uninsulated conductor in nonmetallic-sheathed cable be used as a current-carrying conductor?
• Which type of cable is specifically listed for its use in controlled environments?
• For what reason should all covers be in place before power is applied to the transformer?
• The ampacity of conductors is derated when the ambient temperature exceeds ___ºF.
• The ampacity of UF cable shall be that of ___ degree C conductors.
• The depth of an outlet box intended to support multiple devices must be:
• What NEC® section permits a surface extension from a flush-mounted device box to be made by installing an extension ring?
• Which of the following conductor types typically has the highest resistance?
• Fittings and connectors shall be used only with specific wiring methods. What must they be?
• In a damp location, how far must a metal switch enclosure be mounted off the surface?
• What is the smallest standard size metal box that can be used without violating NEC?
• Determine the maximum current-carrying capacity for each conductor when four 1/0 AWG THW current-carrying copper conductors are installed in a common raceway with an ambient temperature of 86 degrees F.
• What is the smallest trade size EMT that can be installed between two large pull boxes?
• What action should be taken if equipment is found to be defective during an electrical maintenance check?
• Which of the following may not be used in damp or wet locations?
• Vertical runs of metal wireways must be securely supported at intervals not exceeding how many feet, with no more than one joint between supports?
• For angle pulls of conductors 4 AWG and larger, what is the minimum distance required between raceway entries?
• What is the maximum number of 2/0 AWG THHN/THWN conductors allowed in an 8" x 8" wireway?
• The ___ rating of a conductor is the maximum temperature, at any location along its length, that the conductor can withstand over a prolonged period of time without serious degradation.
• If a cabinet or cutout box is constructed of sheet steel, what is the minimum metal thickness required?
• When connecting a white wire to receptacles in a multiwire branch circuit, what is required?
• What is the minimum calculated dimension for width in another pull box as per the reference figure?
• What is the maximum number of joints allowed in vertical runs of metal wireways?
• Which type of lugs requires a minimum bending space of 12 inches for 350 kcmil conductors?
• How many straps are needed to support the conduit between two enclosures if the distance is 123 feet?
• What type of locations can dual-rated THHN/THWN conductors be installed in?
• Which methods can be used to splice 4 AWG conductors inside an LB type conduit body?
• What precaution must be taken with conduits at joints or terminations?
• What is the minimum wire bending space required at the top and bottom of a panelboard with three 3/0 AWG conductors?
• Which type of fittings and enclosures are permitted to be used with IMC?
• Which of the following systems is permitted for running surface extensions from an existing outlet?
• What gauge of wire is used in the example of the junction box containing multiple conductors?
• What type of conductors can be used in a steel metal cable tray designed for equipment grounding?
• What type of metal is aluminum classified as when used for Rigid Metal Conduit (RMC)?
• Which device must be used to ensure that power is off before working on a transformer?
• Which material is generally not recommended for use in outdoor applications?
• What is the minimum height of the pull box as described in the reference?
• Conductors larger than which gauge are typically expected to be stranded?
• According to the NEC®, an 8 AWG bare solid copper conductor has a cross-sectional area of ____ square inches.
• Conductors with thermoplastic and fibrous outer braid Type TBS insulation are specifically used for wiring what type of equipment?
• What is the maximum depth at which a warning ribbon is required to be installed when a service lateral is directly buried?
• What is the minimum trade size EMT required for a 45' long run with specified conductors?
• Trade size 1/2 IMC and RMC use the same fittings. Which of them has the greater wall thickness?
• FS, FD, and larger cast or sheet metal boxes are classified as which of the following?
• Which option is acceptable for securing conductors in a raceway?
• Electrical metallic tubing shall be constructed of any of the following except:
• Is running the equipment grounding conductor inside the FMC considered a Code violation?
• In conductor sizing, AWG stands for American Wire Gauge, or what other measurement?
• How should connections be made to ensure compliance in multiwire circuits?
• When may a single conductor be used in a metallic raceway without a ground?
• What is the minimum depth required for cabinets and cutout boxes to allow door closure for certain switches?
• What is the cross-sectional area of an 8 AWG bare solid copper conductor in square inches?
• Section 314.3 of the NEC® permits nonmetallic outlet and device boxes to be installed with which of the following?
• Which of the following THHN/THWN copper conductors is the smallest size permitted for a 150 A feeder to a subpanel for an addition to an existing dwelling?
• What is the maximum allowable space between a panel enclosure and its cover?
• According to NEC regulations, is it permissible to splice short branch circuit wires with wire nuts?
• Does the NEC® permit the installation where the box is only supported by the conduits, as described in the provided scenario?
• Which of the following is a requirement for underground conductors?
• What is the purpose of the angle pull dimensional requirement?
• What size conductors must be stranded when installed in raceways?
• In a wall made of noncombustible material, cabinets shall be installed so that the front edge of the cabinet is not set back from the finished surface more than ____.
• The ____ of a conductor is measured in mm or in.
• When using 26 feet of Type AC cable for a luminaire, how many additional supports are needed between supports #1 and #2?
• What is the maximum distance between the box and support #1 for the MC cable installation?
• For underground service conductors that are not encased in concrete, how deep must they be buried to require a warning ribbon?
• What is the minimum number of conductors that should be in approved methods in junction boxes larger than specified dimensions?
• How many conductors is a fixture stud in a box considered to be equivalent to?
• What must cabinets and cutout boxes contain to avoid crowding of conductors?
• According to the NEC®, an 8 AWG bare stranded copper conductor has a cross-sectional area of ____ square inches.
• For wires connecting to breakers in a new panelboard, if some are cut too short, what does the NEC state about splicing with wire nuts?
• What is the proper condition when terminating parallel conductors?
• Which drawings satisfy the NEC® requirements for conductor length in boxes?
• For a pull box with a rigid metal conduit that has a removable cover, what is the required minimum depth from the entry wall to the cover?
• The circular mil area of a 12 AWG conductor is ____.
• What does the temperature rating of a conductor indicate?
• During a temperature change from -5°F to 100°F, how much will Schedule 40 PVC expand over an 80-foot run?
• What kind of installations require that the weights of fixtures be marked on outlets?
• What must be considered when calculating the voltage drop in an electrical installation?
• In the installation guidelines provided, what must be accounted for within the box aside from the MC cables themselves?
• What should be employed to prevent electrical shock when working with energized circuits?
• Type UF cable is allowed in which type of environments?
• Is running the equipment grounding conductor on the inside of the FMC a violation of Code if the flex is 8 feet long?
• The ____ of a conductor is measured in mm2, circular mils, or in2.
• Insulated conductors used in wet locations shall ___.
• Type ___ cable is characterized by a factory assembly of insulated circuit conductors.
• In a 30-foot run of conduit containing one conductor, what is the maximum cross-sectional area that can be occupied by the conductor?
• Which of the following is the minimum permitted junction box volume for installation?
• PVC shall not be permitted where subject to ambient temperature in excess of ________ degrees Fahrenheit unless listed otherwise.
• When eight current-carrying conductors are in one conduit, the ampacity of each conductor is adjusted to what percentage?
• Which type of transformer work requires a voltage sensing device?
• How does the size of a conductor impact its resistance?
• How is the height of the pull box determined in relation to conductor entry?
• How many 12/2 AWG with ground NM cables are allowed in an 18 cubic inch outlet box with a duplex receptacle?
• What is the minimum required bending space for conductors connected to a removable lug at I?
• What is the minimum calculated height for a specified pull box?
• How far from the floor can nonmetallic surface extensions run?
• In a 480/277-volt, 3Ø, 4-W panel, which wire color is permitted for a wire connected to breaker 41?
• Where is the cross-sectional area in circular mils located for voltage-drop calculations?
• What is the maximum cross-sectional area that can be occupied by conductors in a 40-foot run of conduit containing a specific number of conductor(s)?
• What is the minimum calculated width for another pull box described?
• What is the minimum depth required for a pull box with a 2½” rigid metal conduit?
• An electrician needs to install a surface-mounted, nonmetallic, weatherproof cabinet on the outside of a concrete block building. How many inches of airspace must there be between the cabinet and the wall?
• Mineral-insulated, metal-sheathed cable shall be supported and secured at intervals not exceeding what distance?
• What must be done for all conductors in pull boxes exceeding a certain measurement?
• Which trade size 11/4 raceways has the smallest cross-sectional area?
• According to the NEC®, what are the requirements for parallel conductors in each phase or neutral?
• What is the minimum dimension permitted for Y when Type UF cable is used along a driveway?
• What is a standard requirement for conduit used in exposed conditions?
• A 300-foot run of 800-amp busway is installed in a commercial warehouse building. The last 20' of the busway run is reduced to a bus rating of 200 amps. What is required for the installation of the smaller bus?
• For a 40-foot run of conduit, what would typically be the maximum fill limit for three conductors?
• Which key factor influences the width dimension calculations of pull boxes?
• What is the maximum number of current-carrying conductors that can be utilized at any cross section of a wireway without needing ampacity adjustment factors?
• A wall-mounted luminaire that weighs 4 pounds is permitted to be mounted to which of the following?
• The ampacity of UF cable is rated based on conductors of ___ degree C.
• In completed installations, each outlet box must have:
• What does 'AWG' stand for in the context of electrical conductors?
• Can transformers be energized while work is being performed inside them?
• Which conductor size must be stranded when installed in raceways?
• For a steel metal cable tray used as an equipment grounding conductor with conductors protected by a 100A circuit breaker, what must the cross-sectional area be?
• When working near exposed energized conductors, each employee shall use what?
• What is the effect of high ambient temperatures on the ampacity of conductors?
• Type FCC cable is designed for installations under ___.
• Vertical runs of metal wireways should be securely supported at intervals not exceeding ____ feet.
• What is the maximum allowable gap between the panel enclosure and the panel cover?
• What is the ampacity of a 1/0 TW copper conductor?
• Where any of the single conductors installed in ladder or ventilated trough cable trays are 1/0 through 4/0 AWG, all single conductors shall be installed in how many layer(s)?
• What is the required airspace between enclosures for overcurrent devices and the wall in damp or wet locations?
• Which of the following about the equipment grounding conductor is true?
• For angle pulls of conductors 4 AWG and larger, the minimum distance between raceway entries enclosing the same conductor must be at least ________ times the size of the larger raceway.
• What is a key factor in determining the distance between supports for MC cable installations?
• Which of the following could be used in a concrete slab?
• What is the smallest 4" square metal box used for a split-wired receptacle when all incoming cables are #12 MC cables?
• What is the circular mil area of a 3/0 AWG conductor?
• What can be deduced about the insulation of conductors in a raceway with multiple conductors?
• What section ensures that the installation of conductors does not cause any damage when wiring devices or equipment?
• Which of the following types of insulation is known for its oil resistance?
• Which box/cover combination will violate the NEC?
• What adjustment must be made to ampacity for conductors carrying current in a conduit?
• Employees working in areas with potential electrical hazards shall use what to protect specific parts of the body?
• When several AC, MC, or NMC cables are installed next to each other in a bundle, the conductors in the cables are able to carry ___ current than if the cables were separated.
• In a metal junction box with 27 cubic inches containing six 12 AWG wires, what is the maximum number of 10 AWG conductors that may be added?
• The minimum thickness for a cast aluminum box measuring 6" X 4" X 3.5" is:
• According to Section 314.24 of the NEC®, what must outlet and device boxes be deep enough to do?
• Trade size 1/2 IMC and RMC are compared. Which has the greater wall thickness?
• Which of the following is not a factor when calculating voltage drop?
• What is the minimum size conductor permitted in commercial buildings for branch circuits up to and including 2000 volts?
• Which of the following THHN/THWN copper conductors is the smallest size permitted for a feeder where a 150 A breaker protects the feeder?
• What is the required minimum distance for a pull box receiving multiple conductors with respect to its cover?
• Which type of cable is allowed to be buried in a trench underground with stabilized sand for protection?
• In a residence, what is the standard voltage for a home service panel where a 150 A subpanel feeder originates?
• What is the maximum weight a ceiling fan can be supported by an outlet box designed for such use?
• When conduit nipples have a maximum length not to exceed how many inches, can they be filled to 60% of their cross-sectional area?
• How much airspace should be maintained between overcurrent device enclosures and the wall?
• What is the cubic-inch allowance for a 10 AWG conductor?
• To ensure proper installation, cable sheath must extend beyond any cable clamp by at least:
• Cablebus shall be installed only for what type of work?
• What is the maximum number of 10 AWG conductors that can be added to a junction box containing six 12 AWG wires with no additional devices?
• What is the maximum occupancy percentage for conductors in a conduit run that is limited to a single conductor?
• Covers of outlet boxes having holes for flexible cord pendants must have what provided to ensure safety?
• How far apart can two junction boxes be connected using bends permitted by the NEC®?
• What happens to the ampacity of conductors when they are installed together in a bundle?
• How many 12 AWG conductors are permitted to be put in a 4-11/16" x 1-1/2" square box?
• Type MC cable shall not be used where exposed to ___ conditions.
• Before activating the power to the transformer, what must be replaced?
• What element must be present in damp or wet locations for overcurrent device enclosures?
• Which type of conduit is typically used where high physical damage is expected?
• A fixture stud in a box is considered the equivalent of how many conductors?
• If a duct has a maximum cross-sectional area occupancy of 31%, how many conductors can safely be installed?
• Which type of box shall not be used where conduits or connectors requiring locknuts or bushings are connected to the side of the box?
• What type of cable connectors are used in a box containing two types of MC cables?
• In a 30-foot run of conduit containing one conductor, the maximum cross-sectional area that can be occupied is what percentage?
• For branch circuits above 2000 volts, what is the minimum conductor size needed in commercial buildings?
• Which of the following bending configurations is permitted in conduit runs?
• ___ cable shall be flame-retardant, moisture-resistant, fungus-resistant, and corrosion-resistant.
• What aspect must be ensured for the installation of nonmetallic boxes in relation to conductor entry?
• Which type of insulation should not be used for wiring in wet locations?
• When threading conduit in the field, what inch taper per foot should the cutting die have?
• Where have bushings been installed on conduits entering a box according to the NEC®?
• What is a requirement for an outlet box when accommodating multiple cables and devices?