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Holt, Electricians Exam Prep, Unit 5 Questions and
Answers.
Cable treated as 1 conductor can take up to _____% of the cross sectional area of a raceway. - Correct answer 53% One conductor can take upt o _____% of the cross sectional area of a raceway - Correct answer 53% Two conductors can take up to _____% of the cross sectional area of a raceway - Correct answer 53% Three or more conductors can take up to ____% of the cross-sectional area of a raceway. - Correct answer 40% Nipple: One or more conductors can take upt o _____% of the cross sectional area of a nipple. - Correct answer 60% When all the conductors are the same size, the number of conductors in a raceway can be determined by looking at the tables located in ________ - Correct answer Annex C Annex C does not have a table for liquid tight flexible nonmetallic conduit of the _____ type - Correct answer black How many no. 14 RHH conductors can be installed in 1 inch electrical metallic tubing? - Correct answer 16 How many compact No. 6 XHHW conductors can be installed in a 1 ¼ inch nonmetallic tubing? - Correct answer 10 If 1 ¼ inch flexible metal conduit has three THHN conductors (not compact) what is the largest conductor permitted to be installed. - Correct answer 1 How many 4/0 RHH conductors (without outer cover) can be installed in 2 inch intermediate metal conduit? - Correct answer 3 How many No. 18 TFFN conductors can be installed in a ¾ inch liquidtight flexible metallic conduit? - Correct answer 39 Chapter 9, Table ____ can be used when calculating the cross-sectional area of insulated conductors - Correct answer 5 Chapter 9, Table ____ can be used when calculating the cross-sectional area of bare conductors. - Correct answer 8
When conduit or tubing does not exceed _____ inches in length, it is called a nipple. - Correct answer 24 The cross sectional areas of conduit and tubing can be found in Table _____ of Chapter
- Correct answer 4 What is the total cross-sectional area of 1 ¼ inch rigid metal conduit? - Correct answer 1.526 inches What is the cross -sectional area for one No. 12 RHW conductor with outer cover? - Correct answer .0353 sq. inch What is the cross-sectional area for one No. 10 RHH without an outer cover? - Correct answer .0333 sq. inch What is the cross-sectional area in square inches for one No. 10 bare solid conductor? - Correct answer .008 sq. inch What is the alternating current resistance of No. 1/0 copper installed in a metal conduit? Conductor length 1000 feet. - Correct answer .12 ohm Raceway and Nipple Calculations: Tables are not useful to determine raceway sizing if conductors are of different sizes. What are the three steps for determining raceway and nipple size. - Correct answer Step 1) cross sectional area of each conductor. Step 2) Cross sectional area for all conductors. Step 3) Size the raceway according to percent fill. Raceway Size: A 400 amp feeder is installed in schedule 40 rigid nonmetallic conduit. This raceway contains three 500 kcmil THHN conductors, one 250 THHN conductor and one No. 3 THHN conductor. What size raceway is required for these three conductors? - Correct answer 3 inch Nipple Size: What size rigid metal nipple is required for three NO. 3/0 THHN conductors, one No. 1 THHN conductor, and one No. 6 THHN conductor? - Correct answer 1 ½ inch Existing Raceway Calculations: What are the three steps to determine raceway cross- sectional spare space area? - Correct answer Step 1) Determine raceways cross- sectional area for conduit fill Tables 1 and 4, Chapter 9. Step 2) Determine the area of the existing conductors. Step 3) Subtract the cross-sectional area of the existing conductors from the area of permitted conductor fill. Existing Raceway Calculations, Part 2: What are the two steps to determine the number of conductors permitted in spare space area? - Correct answer Step 1) Determine the cross-sectional area of conductors to be added. Step 2) Divide the spare space area by the conductors cross-sectional area.
Box Fill Requirements: Wirenuts, cable connectors, raceway fittings and conductors that originate and terminate within the outlet box (such as equipment bonding jumpers and pigtails) are considered _____ conductor. - Correct answer 0 What size outlet box is required for 14/3 type NM cable (with ground) that terminates on a switch, with 14/2 NM cable that terminates on a receptacle, if the box has internal cable clamps factory installed? - Correct answer 4 x 2 1/8 square A round 3 x 1 ½ box has a volume of 6 cubic inches and has factory internal cable clamps. Can this pancake box be used with a lighting fixture that has a domed canopy? Thee branch circuit wiring is 14/2 NM sheath cable and a paddle fan has three fixture wires and one ground wire all smaller than No. 14 - Correct answer No Conductors Added to Existing Box: How many No. 14 THHN conductors can be pulled through a 4 x 2 ½ square box that has a plaster ring 3.6 cubic inches? The box already contains two receptacles, five No. 12 THHN conductors, and one No. 12 bare grounding conductor. - Correct answer 5 Pull Boxes, Junction Boxes and Conduit Bodies must be sized according to Section _____ - Correct answer 314. Straight Pull Calculation (length of raceway): The minimum distance from where the raceway enters to the opposite wall must not be less than _____ times the trade size of the largest raceway. - Correct answer 8 Angle Pull Calculation (90 degrees, diameter of raceway) must not be less than ___ times the trade diameter of the largest raceway plus the sum of the diameters of the remaining raceways on the same wall of the box. - Correct answer 6 U-Pull Calculations: The distance from were the raceways enter to the opposite wall must not be less than _____ times the trade diameter of the largest raceway plus the sum of te diameters of the remaining raceways on the same wall. - Correct answer 6 Depth of Box and Conduit body sizing: When conductors enter an enclosure opposite a removable cover, such as the back of a pull box or conduit body, the distance from where the conductors enter to the removable cover should be calculated according to Table _____, one wire per terminal. - Correct answer 312. Depth of Pull or Junction Box: A 24" x 24" pull box has two 2 inch conduits that enter the back of the box with No. 4/0 conductors. What is the minimum depth of the box? - Correct answer 4 Pull Box Sizing, Horizontal Dimension: A junction box contains two 3 inch raceways on the left side and one 3 inch raceway on the right side. The conductors from one of the 3 inch raceways on the left are pulled through the 3 inch raceway on the right wall. The
other 3 inch raceways conductors are pulled through ta raceway at the bottom of the pull box. What is the horizontal dimension of this box? - Correct answer 24 Pull Box Sizing, Vertical Dimension: A junction box contains two 3 inch raceways on the left side and one 3 inch raceway on the right side. The conductors from one of the 3 inch raceways on the left are pulled through the 3 inch raceway on the right wall. The other 3 inch raceways conductors are pulled through ta raceway at the bottom of the pull box. What is the vertical dimension of this box? - Correct answer 18 Pull Box Sizing, Distance between Raceways: A junction box contains two 3 inch raceways on the left side and one 3 inch raceway on the right side. The conductors from one of the 3 inch raceways on the left are pulled through the 3 inch raceway on the right wall. The other 3 inch raceways conductors are pulled through ta raceway at the bottom of the pull box. What is the minimum distance between the two three inch raceways that contain the same conductors (314-28a-2)? - Correct answer 18 Pull Box Sizing, Horizontal Dimension: A pull box contains two 4 inch raceways on the left and two 2 inch raceways on the top. What is the horizontal dimension of the box? - Correct answer 28 inches Pull Box Sizing, Vertical Dimension: A pull box contains two 4 inch raceways on the left and two 2 inch raceways on the top. What is the vertical dimension of the box? - Correct answer 14 inches Pull Box Sizing, Distance between Raceways: A pull box contains two 4 inch raceways on the left and two 2 inch raceways on the top. What is the minimum distance between the two 4 inch raceways that contain the same conductors? - Correct answer 24 inches Understanding Chapter 9 Tables: When all the conductors are the same size and insulation, the number of conductors permitted in a raceway can be determined simply by looking at the Tables in ______. - Correct answer Annex C Understanding Chapter 9 Tables: When equipment grounding conductors are installed in a raceway, the actual area of the conductor must be used when calculating raceway fill. T/F - Correct answer T Understanding Chapter 9 Tables: When a raceway does not exceed 24 inches, the raceway is permitted to be filled to _____ of its cross-sectional area. - Correct answer 60% How many NO. 6 RHH (without outer cover) can be installed in a 1 " nonmetallic tubing?
- Correct answer 4 How many No. 1/0 XHHW can be installed in 2" flexible metal conduit? - Correct answer 7
Can a round 4 x ½ box marked as 8 cubic inches with manufactured cable clamps supplied with 14/2 NM be used with a fixture that has two No. 18 TFN and a canopy cover? - Correct answer Yes What size square outlet box is required for: one 12/2 NM cable that terminates on a switch, one 12/3 NM cable that terminates on a receptacle, and the box has manufactured cable clamps. - Correct answer 4x2 1/ How many No. 14 THHN conductors can be pulled through a 4 x 1 ½ square box with a plaster ring of 3.6 cubic inches? The box contains two duplex receptacles, five No. 14 THHN and two grounding conductors. - Correct answer 2 When conductors enter an eclosure opposite a removable cover, the distance from where the conductors enter to the removable cover determined using Table _____ ( terminal column) - Correct answer 312.6(A) A junction box contains two 2 ½ inch raceways on the left side and one 2 ½ inch raceway on the right side. The conductors from one 2 ½ inch raceway are pulled through the raceway on the righ wall. The other 2 ½ inch raceway conductors (on the side) are pulled through a 2 ½ inch raceway at the bottom of the pull box. What is the distance from the left wall to the right wall? - Correct answer 20 inches A junction box contains two 2 ½ inch raceways on the left side and one 2 ½ inch raceway on the right side. The conductors from one 2 ½ inch raceway are pulled through the raceway on the righ wall. The other 2 ½ inch raceway conductors (on the side) are pulled through a 2 ½ inch raceway at the bottom of the pull box. What is the distance from the bottom wall to the top wall? - Correct answer 15 inches A junction box contains two 2 ½ inch raceways on the left side and one 2 ½ inch raceway on the right side. The conductors from one 2 ½ inch raceway are pulled through the raceway on the righ wall. The other 2 ½ inch raceway conductors (on the side) are pulled through a 2 ½ inch raceway at the bottom of the pull box. What is the distance from between the raceways that contain the same conductors? - Correct answer 15 inches A junction box contains two 2 inch raceways on the left side and two 2 inch raceways on the top. What is the distance from the left to the right wall? - Correct answer 14 inches A junction box contains two 2 inch raceways on the left side and two 2 inch raceways on the top. What is the distance from the bottom to the top wall? - Correct answer 14 inches A junction box contains two 2 inch raceways on the left side and two 2 inch raceways on the top. What is the distance between the 2 inch raceways that contain the same conductors? - Correct answer 12 inches
A 3 inch schedule 40 PVC raceway contains seven No. 1 RHW conductors without outer cover. How many No. 2 THW conductors may be installed in this raceway with the existing conductors? - Correct answer 11 Determine the minimum cubic inches required for two No. 10 TW passing through a box, four No. 14 THHN terminating, two No. 12 TW terminating to a receptacle, and one No. 12 equipment bonding jumper from the receptacle to the box. - Correct answer 22 cubic inches When determining the number of conductors in a box fill two No. 18 fixture wires, one 14/3 nonmetallic sheathed cable with ground, one duplex switch, and two cable clamps would count as ______ conductors. - Correct answer 9 If a 250kcmil wire is run through a 3 inch raceway entry in the wall opposite to a removable cover, the distance from that cover must not be less than _______. - Correct answer 4 ½ inches Compliance with the provisions of the Code will result in _____. (Article 90) - Correct answer an electrical system free from hazard (Article 90) The Code applies to the installation of electrical conductors and equipment within or on public and private buildings, of outside conductors and equipment on the premises, and of optical fiber cable. (True,False) - Correct answer True (Article 90)Installations of communications equipment under the exclusive control of communications utilities located outdoors or in building spaces used exclusively for such installations ______ covered by the Code. - Correct answer Are not (Article 90)Explanatory material, such as references to other standards, references to related Sections of the Code or information related to a Code rule is included in the NEC in the form of informational notes. (True/False) - Correct answer True (Article 90) Plans and specification that provide ample space in raceways, spare raceways, and additional spaces will allow for future increases in the use of electricity. Distribution centers located in readily accessible locations will provide convenience and safety of operation. (True/False) - Correct answer True (Article 100) A junction box above a suspended ceiling that has removable panels is considered to be _______. - Correct answer Accessible (Article 100) Acceptable to the authority having jurisdiction means that the equipment has been _____. - Correct answer Approved (Article 100) According to the Code, automatic is self-acting, operating by its own mechanism when actuated by some impersonal influence such as change in current strength, mechanical configuration, temperature. (True/False) - Correct answer True
A system or circuit conductor that is intentionally grounded is a(n)_____ This conductor is often called a neutral conductor in the field, and is identified with the color white or gray. - Correct answer Grounded conductor A system intended to provide protection of equipment from damaging line-to-ground- fault currents by operating to cause a disconnecting means to open all ungrounded conductors of the faulted circuit is defined as _____. - Correct answer Ground-fault protection of equipment The highest current at rated voltage that a device is intended to interrupt under standard test conditions is the ______. - Correct answer Interrupting rating An outlet intended for the direct connection of a lampholder, a lighting fixture, or a pendant cord terminating in a lampholder is a(n) _____. - Correct answer Lighting outlet A ______ location may be temporarily subject to dampness and wetness. - Correct answer Dry A(n) ______ is a point on a wiring system where current is taken to supply equipment that uses electricity. - Correct answer Outlet A single panel or group of panel units designed for assembly in the form of a single panel is called a _______ - Correct answer panelboard An enclosure or device so constructed that a beating rain will not enter is _______. - Correct answer Raintight Equipment enclosed in a case or cabinet that is provided with a means of sealing or locking so that live parts cannot be made accessible without opening the enclosure is said to be _______. - Correct answer Sealable Service conductors only originate from the service point and terminate at the service equipment (disconnect). Conductors supplied from back-up generators, battery UPS systems, transformers, etc., are considered "feeders". - Correct answer True The necessary equipment, usually a circuit breaker or switch and fuse and their accessories, intended to constitute the main control and cutoff of the supply is referred to as _____. - Correct answer Service equipment A signaling circuit is any electric circuit that energizes signaling equipment. (True/False)
- Correct answer True A _____ switch is a manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch. - Correct answer Bypass isolation
A thermal protector may consist of one or more heat-sensing element integral with the motor or motor-compressor and an external control device.(True/False) - Correct answer True A value assigned to a circuit or system for the purpose of conveniently designating its voltage class such as 120/240 volts is called ______voltage. - Correct answer Nominal In judging equipment, considerations such as mechanical strength and arcing effects should be evaluated(True/False) - Correct answer True Conductors larger than No. 4/0 are measured in _____. - Correct answer Circular mils Equipment intended to break current at other than fault levels shall have an interrupting rating at system voltage sufficient for the current that must be interrupted.(True/False) - Correct answer True Circuit protective devices are used to clear a fault without the occurrence of extensive damage to te electrical components of the circuit. This fault shall be assumed to be either between two or more of the _____ or between any circuit conductor and the grounding conductor or enclosing metal raceway. - Correct answer Circuit conductors Equipment approved for use in dry locations shall be protected against permanent damage from the weather during _____. - Correct answer Building construction The Code prohibits damage to the internal parts of electrical equipment by foreign material such as paint, plaster, cleaners, etc. Precautions must be taken to provide protection from the detrimental effects of paint, plaster, cleaners, etc. on the internal parts of ______ and ______. - Correct answer Panelboards, receptacles Connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be made by means of solder lugs, pressure connectors, splices to flexible leads. (True/False) - Correct answer True The temperature rating associated with the ampacity of a _____ shall be so selected and coordinated so as to not exceed the lowest temperature rating of any connected termination, conductor, or device. - Correct answer Conductor Design B, C, D, or E motors shall be wired with conductors having an insulation rating of at least _____ degrees C, and the conductor shall be sized based on the 75 degree C ampacity as listed in Table 310-15(B)(16) (formerly 310-16) - Correct answer 75 degrees C The NEC required series-related installations to be field-marked to indicate the maximum level of fault-current for which the system has been installed. - Correct answer True
Article 200 contains the requirements for the identification of terminals, grounded conductors in premises wiring systems, identification of grounded conductors. (True/False) - Correct answer True An insulated grounded conductor of No. ____ or smaller shall be identified by a continuous white or natural gray outer finish along its entire length. - Correct answer 6 When different wiring systems are in the same raceway or enclosure, the grounded conductor of one system can be white and the grounded conductor of the other system can be gray (True/False) - Correct answer False Identification of the grounded conductor terminal on a device shall be by a metal or metal coating substantially white in color or the word ______ located adjacent to the identified terminal. - Correct answer White (210)Multiwire branch circuits shall supply only line to _____ loads - Correct answer neutral (210)Each system _____ conductor, wherever accessible, shall be identified by a separate color coding, marking tape, tagging, or other equally effective means. This applies to multiwire branch circuits when there Is more than one system voltage in a building. - Correct answer Ungrounded (210)Receptacle and cord connectors having grounding terminals must have those terminals effectively _______. - Correct answer Grounded (210)All 125 volt, single phase 15 and 20 ampere receptacles installed in bathrooms of guest rooms in hotels/motels, dwelling units, and office buildings shall have ____________for personel. - Correct answer Ground-fault circuit interrupter protection (210)Grade-level portions of ________and _______ accessory buildings used for storage or work areas shall have ground-fault ciruit interrupter protection for all 15 and 20 ampere, 125 volt receptacles. - Correct answer Finished, unfinished (210)Dwelling unit GFCI protection is required for all 125-volt, 15 and 20 ampere receptacles installed to supply countertop appliances in kitchens.(True/False) - Correct answer True (210)A dedicated 20-ampere circuit is permitted to supply power to a dwelling unit bathroom for receptacle outlet(s) and other equipment within the same bathroom. (True/False) - Correct answer True (210)The recommended maximum total voltage drop on both the feeders and banch circuits is _____ percent. - Correct answer 5
(210)A single receptacle installed on an individual branch circuit must be rated at least _____ percent of the rating of the circuit. - Correct answer 100 (210)A branch circuit rated 20 amps serves four receptacles. The rating of the receptacles must not be less than _____ amperes. - Correct answer 15 (210)The total rating of utilization equipment fastened in place shall not exceed _____ percent of the branch circuit ampere rating, where the circuit supplies receptacles for cord-and-plug connected equipment. - Correct answer 50 (210)A permanently installed cord connector on a cord pendant shall be considered a receptacle outlet.(True/False) - Correct answer True (210)In dwelling units, when determining the spacing of general use receptacles, ____ on exterior walls are not considered wall space. - Correct answer Sliding panels (210)Indwelling units, outdoor receptacles can be connected to the 20 ampere small appliance branch circuit.(True/False) - Correct answer False (210)The 24 inch dimension required in a dwelling unit countertop is measured along the wall line or center line, and the intent is that there be a receptacle outlet for every _____linear feet or fraction thereof of counter length. - Correct answer 4 (210)When breaks occur in dwelling unit kitchen countertop spaces for ranges, refrigerators, sinks, etc., each countertop surface is considered a separate counter space for determining receptacle placement.(True/False) - Correct answer True (210)Receptacle outlets in a dwelling unit must be installed within _____ inches of the outside edge of each basin and the receptacle must be located on a wall that is adjacent to the basin location. - Correct answer 36 (210)For a one-family dwelling at least one receptacle outlet is required in each basement, attached garage, or detached garage with electric power.(True/False) - Correct answer True (210)Receptacles installed behind a bed in the guest rooms in hotels and motels shall be located so as to prevent the bed from contacting an attachment plug, or the receptacle shall be provided with a suitable guard.(True/False) - Correct answer True (210)At least _____ wall switch-controlled lighting outlet(s) shall be installed in every dwelling unit habitable room and bathroom. - Correct answer One (210)In a dwelling unit, every habitable room, including hallways and stairways and bathrooms shall have a switch-controlled lighting outlet.(True/False) - Correct answer True
(220) Feeder conductors for new restaurants shall not be required to be of ______ ampacity than the service-entrance conductors. - Correct answer Greater (220) For each farm building or load supplied by _____ or more branch circuits, the load for feeders, service-entrance conductors, and service equipment shall be computed in accordance with demand factors not less than indicated in Table 220-102. - Correct answer Two (225) Conductors for ____ lighting shall be of the rubber-covered or thermoplastic type.
- Correct answer Festoon (225) If festoon lighting exceeds a span of ____ feet, messenger wires shall support the conductors. - Correct answer 40 (225) Communications conductors shall be mounted not less than ____ inches below power conductors rated over 300 volts supported on poles. - Correct answer 30 (225) Outside branch circuits and feeder conductors shall have a vertical clearance of _____ feet from the surface of a roof. - Correct answer 8 (225) Overhead branch circuit and feeder conductors shall not be installed _____ openings through which materials may be moved, such as openings in farm and commercial buildings, and hall not be installed where they will obstruct entrance to these building openings. - Correct answer Beneath (225) Where buildings exceed three stories, overhead lines shall be arranged so that a clear space at least 6 feet wide will be left either adjacent to the buildings or beginning not over 8 feet from them to facilitate the _____ when necessary for fire fighting. - Correct answer Raising of ladders (225) Lamps for outdoor lighting shall be below all _____, transformers or other electrical utilization equipment. - Correct answer Energized conductors (230) A building or structure shall be supplied by a maximum of _____ services. - Correct answer One (230) Branch circuit and feeder conductors shall not be installed in the same raceway or cable with service conductors.(True/False) - Correct answer True (230) Overhead service conductors to a building shall maintain a vertical clearance of 10 feet above platforms, projections, or surfaces from which they might be reached. This vertical clearance shall extend _____ feet measured horizontally from the platform, projections, or surfaces from which they might be reached. - Correct answer 3
(230) The _____ clearances for all service drop conductors shall be based on a conductor temperature of 60 degrees F, no wind; with final unloaded sag in the wire, conductor, or cable. - Correct answer Vertical (230) The requirement for maintaining a 3 foot vertical clearance from the edge of the oof shall not apply to the final conductor span where the service drop is attached to ______. - Correct answer The side of a building (230) Overhead sevice drop conductors shall have a horizontal clearance of _____ feet from a pool.(680.8) - Correct answer 10 (230) Service-lateral conductors are required to be insulated (except the grounded conductor) when it is _______. - Correct answer Copper-clad aluminum with individual insulation (230) To supply power to a single-phase water heater, the size of the underground service lateral conductors shall not be smaller than _____. - Correct answer No. 10 aluminum (230) Underground Service-entrance conductors are required to be insulated except when they are bare copper installed in a raceway, or bare copper and part of the cable assembly identified for underground use.(True/False) - Correct answer True (230) Service entrance conductors can be spliced or tapped by clamped or bolted connections at any time as long as the free ends of conductors are covered with an insulation that is equivalent to that of the conductors or with an insulating device identified for the purpose (Sections 110-14); wire connectors or other splicing means installed on conductors that are buried in the earth shall be listed for direct burial [section 300-5e]; or No splice is made in the raceway Section 300-13 - Correct answer True (230) Individual open conductors and cables other than service-entrance cables shall not be installed within _____ feet of grade level or where exposed to physical damage. - Correct answer 10 (230) Where individual open conductors are not exposed to the weather, the conductors shall be mounted on _____knobs. - Correct answer Glass or porcelain (230) Service heads for service raceways shall be ______. - Correct answer Listed for use in wet locations (230) Service heads must be located _____. - Correct answer Above the point of attachment
(240) Flexible cords approved for use with listed appliances or portable lamps shall be considered as protected by a 20 ampere circuit breaker if they are ____. - Correct answer No. 18 and larger (240) Breakers and fuses can be used in parallel when factory assembled in parallel or listed as a unit.(True/False) - Correct answer True (240) Where an orderly shut down is required to minimize hazard() to personnel and equipment, a system of coordination based on two conditions shall be permitted. Those two conditions are (10______short-circuit protection, and (2) ______ indication based on monitoring systems or devices. - Correct answer Coordinated, overload (240) A current transformer and overcurrent relay shall be considered equivalent to an overcurrent trip unit(True/False) - Correct answer True (240) Single-pole breakers with approved handle ties can be used for the protection for each ungrounded conductor for line to nuetral connected loads.(True/False) - Correct answer True (240) Conductors supplying a transformer shall be permitted to be tapped without overcurrent protection at the tap where the conductors supplying the _____ of the transformer have an ampacity at least 1/3 the rating of the overcurrent device protecting the feeder conductors. - Correct answer Secondary (240) No overcurrent protection device shall be connected in series with any conductor that is intentionally grounded, except where the overcurrent protection device opens all conductors of the circuit including the _____ conductor, and is so designed that no pole can operate independently. - Correct answer Grounded (240) Overcurrent protection devices are not permitted to be located where exposed to physical damage; near easily ignitable materials, such as clothes closets; in bathrooms of dwelling units.(True/False) - Correct answer True (240) Plug fuses of 15 amperes and lower ratings shall be identified by a _____ configuration of the window, cap, or other prominent part to distinguish them from fuses of higher ampere ratings. - Correct answer Hexagonal (240) Fuseholders of the Edison-base type shall be installed only where they are made to accept _____ fuses by the use of adapters. - Correct answer Type S (240) Type S fuses, fuse holders, and adapters are required to be designed so that tampering and shunting would be difficult (True/False) - Correct answer True
(240) Fuseholders for cartridge fuses shall be so esigned that it is difficult to put a fuse of any given class into a fuseholder that is designed for a _____lower, or _____ higher, than that of the class to which the fuse belongs. - Correct answer Current, voltage (240) Cartridge fuses and fuseholders shall be classified according to _____ranges. - Correct answer Voltage and amperage (240) Markings on circuit breakers required by the Code shall be permitted to be made visible by removal of a _____ or cover. - Correct answer trim (240) Where used as switches in 120-volt and 277-volt fluorescent lighting circuits, circuit breakers shall be marked ______. - Correct answer SWD (250) Conductive materials enclosing electrical conductors or equipment are grounded to limit the voltage to ground and are bonded to facilitate the operation of overcurrent protection devices under ground-fault conditions.(True/False) - Correct answer True (250) Currents that introduce noise or data errors in electronic equipment shall be considered objectionable currents.(True/False) - Correct answer False (250) _____on equipment to be grounded shall be removed from contact surfaces to ensure good electrical continuity. - Correct answer Nonconductive coatings (250) A grounding connection shall not be made to any grounded circuit conductor on the ____ side of the service disconnecting means except as permitted for separately derived systems or separate buildings. - Correct answer Load (250) Where service-entrance conductors are installed in parallel, the grounded conductor in each raceway can be sized, based on the size of the ungrounded service- entrance (phase) conductor in the raceway, but not smaller than _____. - Correct answer No. 1/ (250) A grounding electrode is required if a building or structure is supplied y a feeder, or by more than one branch circuit.(true/False) - Correct answer True (250) What size copper grounding electrode conductor is required for a service that has three sets of 500 Kcmil copper per phase? - Correct answer No. 3/ (250) An additional electrode shall suppleent a metal underground water pipe. Where the supplemental electrode is a made electrode as in Section 250-83(c) or (d), that portion of the bonding jumper that is the sole connections to the supplemental grounding electrode shall not be required to be larger than _____ wire. - Correct answer No. 6 AWG copper or No. 4 AWG Aluminum (250) If none of the electrodes specified in Section 250-50 are available, then local metal underground systems or structures (not gas); ground rods or pipes; or plate
