Download Journeyman Electrician Exam Prep: NEC Code Questions and Answers and more Exams Electrical and Electronics Engineering in PDF only on Docsity!
Journeyman electrician exam prep
What table sizes bonding jumpers for for AC systems? correct answers250.102(C)(1) The NEC defines continuous load to be a load where max current on the circuit continues for at least how many hours? correct answersThree To use the adjustment factors in table 310.15(B)(3)(A), you must have greater than how many current carrying conductors in a raceway? correct answersGreater than three Where in the NEC codebook would you find EMT sizes for a given size and number of conductors? correct answersAnnex C, Table C. Section 210.20(A) states that the over current protection for branch circuits including continuous loads must be greater than 100% of the noncontinuous plus ____ of the continuous load. correct answers125% Liquidtight Flexible Metal Conduit shall be fastened within of each box or other conduit termination correct answersTwelve inches 314.28(A)(1) states that straight pulls in pull boxes with conductors size 4 AWG or larger, box length should be greater than or equal to times the trade diameter of the largest conduit entering box. correct answersEight Chapter 9 note 4 states conduit nipples less than 24 inches can fill to a max of their cross sectional area correct answers60 percent Table 348.22 gives the max number of insulated conductors in size _______ FMC? correct answers3/ (trade size)
Guest rooms of hotels, motels, & sleeping rooms in dorms need a MIN or _____ general purpose receptacles installed that are readily accessible? correct answersTwo When branch-circuit conductors are contained inside a ballast compartment and they are within 3 inches of the ballast, the conductors shall have a temperature rating of at LEAST _____. a) 105 degrees C b) 90 degrees C c) 75 degrees C d) 60 degrees C correct answersB: 90 degrees C Ref: 410. Class _____ locations are those that are hazardous because of the presence of easily ignitible fibers or materials producing combustible flyings. a) I b) II c) III d) IV correct answersC: III Ref: 500.5(D) Class _____ locations are those in which flammable gases, flammable liquid produced vapors, or combustible liquid produced vapors are present that are explodable. correct answersClass 1 Class ____ locations are those that are hazardous because of combustible dust correct answersClass II Conductors with _______ Insulation have a greater ampacity when used in a dry location compared to when used in a wet location correct answersTHHW When calculating total load for buildings and finding minimum branch circuit load, what must be factored into the volt amps for an exterior electric sign? correct answersDemand load (1.25)
422.13 states fixed storage water heaters with a capacity of ____ gallons should be considered a continuous load for sizing branch circuits correct answers120 gallons 250.54(G) states when driving a ground rod and solid rock is encountered, the ground rod is permitted to be buried in a trench at least how deep? correct answers30 inches Section 210.11(C)(2) states at least one additional _____ amp circuit shall be provided to supply the laundry outlet in the laundry room correct answers20 ampere What section of the NEC discusses corrosion protection? correct answers300. 300.6 says that where corrosion protection is necessary and the conduit is threaded in the field, the threads shall be coated with what? correct answersAn electrically conductive, corrosion resistant compound 110.26 (E) discusses the space equal to the width and depth of the equipment and extending from the floor to a height of six feet above the equipment or to the structural ceiling. What is this called? correct answersDedicated electrical space For single phase dwelling services, when sizing conductors, 100-400 amps, what do you multiply your ampacity by to derate? correct answers83 percent For stationary motors of 2 hp or less, and 300 volts or less, a general use switch having an ampere rating of _____ the flc rating of the motor is permitted to be used correct answers2 times 240.22 states no over current device shall be connected in series with any conductors correct answersThe overcurrent device opens all conductors of the circuit, including the grounded and is designed so no pole can operate independently. 314.72(E) states that a suitable cover to cover an underground box is considered to weigh what and shall have what written on it? correct answers100 pounds "Danger - High Voltage - Keep out"
When an industrial control panel is supplied from a 3 phase, 4 wire, delta connected electrical system, the phase having the higher voltage to ground is labeled the correct answers"B" phase Where in the codebook would you find info about the minimum clearance for conductors passing over a public driveway? correct answers225.18(4) Outside branch circuits and feeders For Class 1 Divisions 1 and 2 locations, the conduit seal shall not exceed ____% fill of the cross sectional area correct answers25% Where in the code would you find information about conduit seals? correct answersHazardous locations Table 300.5 shows what for different types of wiring methods or circuits based on the location? correct answersMinimum coverage requirements 0 to 1000 volts nominal burial in inches For show windows, atleast one 125 volt single phase 15 or 20 amp rated receptacle shall be installed within 18 inches from the top of the show window for every _____ feet of the horizontal window area? correct answers12 feet conductors supplying several motors, or a motor and other loads, shall have an ampacity equal or greater than the sum of what? correct answers125% flc of biggest motor + flc of all other motors + 100% of noncont non motor load + 125% of cont non motor load In general, when current carrying conductors are installed in parallel, the paralleled conductors in each phase shall be what two things? correct answersThe same size in circular mil area and have the same insulation type Any motors that supply a motor used in a short time, intermittent, or varying duty application are permitted to have an ampacity of not less than the percentage values on table _______ and called what? correct answers430.22(E) Duty Cycle Service For branch circuit, short circuit and ground fault protection of motors, what table gives percentages of flc for sizing of fuses and breakers? correct answers430.
Outlet definition NEC correct answersA point on the wiring system at which current is taken to supply utilization equipment Disregarding exceptions, the NEC mandates the MINIMUM size overhead service conductors to be correct answers8 AWG copper or 6 AWG aluminum Receptacles incorporating an isolated grounding conductor connection intended for the reduction of electrical noise, shall be identified by a/an_______located on the face of the receptacle correct answersred dot For the purpose of determining conductor fill in a device box, the NEC mandates a switch to be counted as equal to two (2) conductors. The volume allowance for the two (2) conductors. The volume allowance for the two conductors shall be based on the: correct answersLargest size wire in the box Where in the NEC codebook would you find information regarding Cables, Raceways, or Boxes installed in or Under Roof Decking? correct answers300.4(E) Which section of the NEC codebook contains conductors for general wiring charts? correct answers310.15(B)(16) When calculating the branch circuit load for a counter mounted cooking unit and not more than two wall mounted ovens that are supplied from a single branch circuit and located in the same room, 220.55 note 4 states that you can do what? correct answersAdd the two nameplate ratings and treat it as one range When sizing type NM cable conductors in 220.15(B)(16), what temperature rating column do you always use? correct answers60 degrees celsius Direct and alternating current differ in that alternating current correct answersreverses at intervals Luminaires containing a metal halide lamp (other than a thick glass PAR lamp) shall be provided with a containment barrier that encloses the lamp, or shall be provided with a containment barrier that encloses the lamp, or shall be provided with a physical means that only allow the use of a correct answerslamp that is type O
The ampacity adjustment factors for conductors in section 310.15(B)(3)(a) of the NEC are not required to be applied when the conductors are installed in a metal wireway unless the number of current carrying conductors within the wireway exceeds correct answers Ceiling suspended (paddle) fans weighing MORE than ____ pounds shall be supported independently of the outlet box correct answers70 pounds The connection between the grounded circuit conductor and the equipment grounding conductors at the electrical service is recognized as the _____ in the NEC correct answersmain bonding jumper The NEC requires an equipment bonding jumper to be correct answerscontinuous When determining the number of 120V, 15 amp 2wire lighting branch circuits required for a residence 70ft by 30ft, you multiply by 3 va/square foot and then what? correct answersDivide that number by 120, then the size of the branch circuit (15 amps) In the electric space heating equipment section of the NEC, resistance type heating elements in electric space heating equipment shall be subdivided into loads NOT exceeding correct answers48 amperes Where would you find amperage ratings for type SRD multi-conductor cable? correct answersFlexible Cords and Flexible cables 400.5 (A)(1) 250.97 Exception 2 in the NEC says for circuits over _____ to ground, the electrical continuity of RMC that contain any conductor, other than service conductors, shall be isured with 2 locknuts, one inside and one outside of boxes and cabinets correct answers250 volts An enclosure that contains a device (s) shall have a weight supported by a single conduit that does not exceed ________ lbs. 314.23(f)(e) correct answers20 lbs What is the difference between RHW and RHW-2? correct answers75 degrees celsius maximum operating temperature vs. 90
