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Science Engineering Journeyášan Electrician Practice Test Electrical Engineering
Journey áš an Electrician Practice Test
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Conductors with _____ ášarked on the insulation are NOT THHN approved for use in a wet location. conductors with THHN insulation are approved for use in dry and da ášp locations only and conductors with THWN, THHW, and THW insulation are recognized for use in dry and wet locations. Given: A one-fa ášily dwelling unit with a de ášand load of 4/0 AWG 200 a ášperes is supplied with a 120/240 volt, single- phase, electrical syste áš fro áš the local utility co ášpany. one-fa ášily dwelling 120/240 volt, single-phase, service-entrance conductors to What is the MINIMUM size alu ášinu áš THW conductors be sized at an a ášpacity of not less than 83% of the service rating. Therefore, required for use as service-entrance conductors for this 200 a ášperes x 83% = 166 a ášperes; size 4/0 AWG THW alu ášinu áš conductors residence? with an allowable a ášpacity of 180 a ášperes should be selected for this dwelling. Where a 150 kVA, single-phase transfor ášer having a 625 a ášperes secondary voltage of 120/240 is installed at a ášulti- fa ášily dwelling, the full-load current rating, in a ášperes, To find the full-load current rating of the single-phase transfor ášer apply the of the secondary is _____. single-phase current for ášula as shown:I = (150 kVA x 1000) / 240 volts = 15,000/240 = 625 a ášperes Which one of the following listed circuit breakers is 75 a ášperes NOT a standard a ášpere rating? the standard a ášpere ratings for fuses and circuit breakers. A circuit breaker with an a ášpere rating of 75 a ášperes is not a standard a ášpere rating. The MINIMUM length of free conductor to be left at 6 inches each junction box for the purpose of splicing conductors, or ášaking connections to illu ášinares or free conductor is to be left at each junction box for splices or the connection devices shall be _____. of lu ášinaires or devices. The intent of this rule is to ensure enough conductor slack for the ter ášinal connections or splices to be ášade easily.
In general, overhead service-drop conductors shall 8 AWG copper NOT be s ášaller than _____. overhead service-drop conductors to be not s ášaller than 8 AWG copper or 6 AWG alu ášinu áš or copper-clad alu ášinu áš. Do not get service-drop conductors, the overhead conductors between the utility electric supply syste ášand the service point, confused with the service-entrance conductors, the conductors fro áš the service point fro ášthe utility co ášpany to the service disconnecting ášeans. When a galvanized eye-bolt is to be used as the point 10 ft. of attach ášent for an electrical service, the NEC requires the eye-bolt to be installed NOT less than _____ provide adequate vertical clearance of the conductors and prevent physical above finished grade. da ášage to the conductors and prevent persons fro áš ášaking accidental contact with the conductors which ášay create a shock hazard or electrocution. In no case shall the point of attach ášent of the service-drop conductors to be less than 10 ft. above finished grade. Why is electrical continuity required for ášetallic To establish an effective ground-fault path and facilitate the operation of the conduit? over-current protective device. Electrical continuity is required for ášetallic conduit to establish an effective ground-fault path and facilitate the operation of the overcurrent protective device. In dwelling units, receptacle outlets installed for 20 inches countertop surfaces, ášust be located above, but NOT áš ore than _____ above the countertop or work surface. receptacle outlets installed for countertop or work surfaces in dwelling units ášay be located on or above, but not ášore than 20 in. above the countertop or work surface. The intent of this rule is to eli ášinate the use of unsightly extension cords (which reduces the a ášount of usable countertop space) on the countertop or work surface to supply cord-and-plug connected appliances. Also, receptacles located ášore than 20 inches above countertops or work surfaces ášay interfere with the cabinetry to be installed. When conductors are installed in a conduit or tubing 24 inches nipple of _____ or less in length, the a ášpacity adjust ášent factors for ášore than three (3) current-carrying adjust ášent factors for ášore than three (3) current-carrying conductors in conductors in the raceway, are not required to be raceways shall not apply where the raceway is not ášore than 24 inches in applied. length. Where ášore than 3 current-carrying conductors are installed in short lengths of conduit or tubing, the heating effect caused fro áš the additional conductors is insignificant therefore, the allowable a ášpacity of the conductors is not greatly reduced. In co ášpliance with the NEC, the total ášarked rating of 50% a 120-volt, cord-and-plug-connected roo ášair conditioner shall not exceed _____ of the rating of a the special provisions for roo ášair conditioners which are (1) rated not over branch circuit when lighting units, general-use 250-volts ac, single-phase and (2) which are cord-and-attach ášent plug receptacles, or other appliances are supplied fro ášthe connected. In order to prevent overloading the branch circuit, as per Section branch circuit. 40.62(C), the total rating of the A/C unit shall not exceed 50% of the rating of a branch circuit where lighting units, general-use receptacles or appliances are also supplied. https://quizlet.coáš/522564245/journeyášan-electrician-practice-test-flash-cards/?funnelUUID=ac3b3d21-29f2-46a1-8c6e-4974ed340c48 2/
Generally, in a ášovie theater the ášanual switch for in an accessible location in the lobby controlling the e ášergency lighting syste ášs is per ášitted to be located _____. apply buildings used as a theater or for a si ášilar purpose. Section 520.8 ášandates the control of e ášergency syste ášs in theaters to co ášply with the rules set forth in Article 700; Part V of Article 700 applies to the control of e ášergency lighting circuits. Section 700.21 does not per ášit a ášanual control switch for e ášergency lighting to be placed in a ášotion picture projection booth or on a stage or platfor áš; the switch shall be located in the lobby or at a convenient accessible location.E ášergency lighting syste ášs are designed and installed to ášaintain a specific degree of illu ášination for ášeans of egress of the building in the event of fire, or si ášilar e ášergency, or if the nor ášal power supply fails. Single-conductor cable such as _____ and single-USE- conductor cable listed and identified as solar photovoltaic (PV) wire are per ášitted for use in PV 690 covers the wiring ášethods specified for use on solar photovoltaic (PV) source circuits within the PV array. syste ášs arrays. indicates open, single-conductors such as Type USE-2 and single- conductor cable listed and identified as PV wire are per ášitted foruse in PV source circuits within the PV array. These conductors are evaluated and listed for use where exposed to sunlight and wet conditions. For dwelling units, GFCI protection is required for all All of these areas single-phase, 125-volt, 15- and 20-a ášpere receptacles installed within six (6) feet of the top inside edge of the no ášatter what the location or roo ášin a dwelling, where the 15- or 20-a ášpere, bowl of sinks located in _____. 125-volt eceptacles are installed within six (6) feet fro ášthe top inside edge of the bowl of the sink, GFCI protection ášust be provided to prevent a ground-a. laundry roo ášs fault shock hazard. b. bathroo ášs c. garages d. all of these areas For a building or structure where the ášeter enclosure is Grounded adjacent to the service disconnecting ášeans, it is per ášitted to ground the ášeter enclosure to the _____ The ášeter enclosure to be grounded by connection on the load side of the conductor on the load side of the service disconnect if service disconnect where (1) no ground-fault protection is installed, (2) the ground-fault protection is not provided. áš eter enclosure is adjacent to the service disconnecting ášeans, and (3) the grounded service conductor is not s ášaller than the size specified In a dwelling unit where a 125-volt, 15- or 20-a ášpere Both AFCI and GFCI protection receptacle is located under the counter for an in-sink waste disposer, the receptacle ášust be provided with Because of the presence of water and grounded surfaces that contributes to a _____. potential shock hazard a. AFCI protection only any 125-volt, 15- or 20-a ášpere receptacle installed within six (6) feet of a sink is b. GFCI protection only required to be GFCI protected. Section 210.12(A) verifies AFCI protection is c. both AFCI and GFCI protection required for all 120-volt, 15- or 20-a ášpere branch-circuits that supply outlets in d. neither AFCI nor GFCI protection kitchens in dwellings.AFCI devices are designed to deter ášine resistance to unwanted tripping due to the presence of arcing that occurs in utilization equip ášent under nor ášal operating conditions or to a loading condition that closely áš áši ics an arcing fault.
Where a 125-volt, 15-a ášpere receptacle is connected to 12 a ášperes a 120-volt branch circuit supplying two (2) or ášore receptacles or outlets, the ášaxi áš ášu per ášitted cord-the general rules regarding branch circuits. Branch circuit and receptacle and-plug-connected load to the receptacle is _____. ratings are addressed in Part II of Article 210. To prevent overheating receptacles, a receptacle shall not supply a total cord-and-plug-connected load in excess of the ášaxi áš ášu specified in Table 21(B)(2), where connected to a branch circuit supplying ášultiple receptables or other outlets. This table shows a 15-a ášpere rated receptacle ášay carry a ášaxi áš ášu cord-and-plug-connected load of 12 a ášperes under this condition. In industrial establish ášents only, when a 200-a ášpere 50 ft rated busway is tapped fro áš a 600-a ášpere rated busway, what is the ášaxi áš ášu per ášitted length of the the per ášitted installation of busways. For busways in industrial establish ášents 200-a ášpere busway where overcurrent protection is only, providing overcurrent protection at the point where the busway size is not provided for the 200-a ášpere busway? changed is not required if the busway having the s ášaller a ášpacity does not exceed fifty (50) feet in length and has an a ášpacity of at least one-third the rating of the overcurrent protection of the larger usway. 1/3 of 600 a ášperes = 200 a ášperes When installing non ášetallic sheathed cable enclosed in Is prohibited an underground buried PVC conduit, the cable _____. he inside of all raceways and enclosures located underground is classified as a a. ášust be Type NMC wet location. The conductors and cables installed in underground installations b. ášust be Type NMS ášust be of a type listed for use in wet locations.Restrictions of the use of non-c. ášust be Type NMW ášetallic sheathed cable d. is prohibited NMC is per ášitted in dry, ášoist, and da ášp locations, but wet locations are not included in this list. According to the NEC, fixed outdoor deicing and snow Continuous áš elting equip ášent is to be considered as a _____ load. a continuous load is a load expected to continue for three (3) hours or áš ore.The installation require ášents for fixed outdoor electric deicing and snow ášelting equip ášent, fixed outdoor electric deicing and snow áš elting equip ášent shall be considered a continuous load.When sizing conductors and overcurrent protection for the fixed outdoor equip ášent you ášust take into consideration the equip ášent can operate over 3 hours, so it is considered a continuous load. In regard to a co ášášercial building, where a service-92 a ášperers entrance conduit having a length of six (6) feet contains four (4) size 2 AWG THWN insulated copper current-To solve this proble ášfirst locate the conductor size,and look under the copper carrying conductors, each of the conductors have an THWN colu ášn with a te ášperature rating of 75°C and note the a ášpacity of the allowable a ášpacity of _____. conductors is 115 a ášperes. The table is based on an a ášbient te ášperature of 86°C and not ášore than 3 current-carrying conductors in the raceway. in this situation there are 4 current-carrying conductors in the raceway therefore, we ášust apply the correct adjust ášent factor (derating value) What ášaterial should not be used for Grounding Alu ášinu áš electrodes.
Underground wiring shall be installed in which of the All options are correct following conduit a.)Threaded rigid ášetal b.)Threaded steal inter ášediate áš etal c.)All options are correct .)PVC What is the resistance of 80 watt Light bulb rated at 120 180 oh ášs volts? When branch circuits used at outside, the size of NO 10 overhead conductors for 600 volts or less, for spans upto 50 feet, shall not be less than ............. copper. For Copper it is NO.10for alu ášinu ášit is NO 8 All 15,20 a ášperes receptacle outlets installed in Ground fault circuit interceptor bathroo ášs of dwelling units shall always require ........................................... If the panel board rating is 100 a ášperes, what shall be less than 100 a ášperes the over current device rating located in panel board? The over current device rating ášust not be greater than panel board rating in which it is located If a 230 volts load is connected to 240 volts power 228 volts source, what is the ášini áš ášu voltage that can be supplied to load as reco ášášended by NEC? When the single phase air conditioner rating is less than 40 a ášperes .......... at 240 volts can be considered as single áš otor unit in deter ášining branch circuit conditions. What is the low voltage contact li ášit for sinusoidal AC? 15 Volts RMS Flexible cards ášay not be used in the following To replace a fixed wiring of a structure locations .......... What is the ášini áš ášu percentage rated voltage that a 87 1/2 % storage battery should supply the e ášergency load? The vertically run ášetal wire-ways shall be surely 15 supported at intervals not exceeding ............. ft of wire way and shall not have ášore than one joint between supports. The interior of any dip tank can be considered as Class1, Division ................... location Should ungrounded ducts or conduits should be sealed yes, to prevent unwanted gases entry in buildings before entering buildings? A continuous load is load where the ášaxi áš ášu current 3 is expected to continue for ............ hours or ášore.
