Journeyman electrician exam prep with 100% correct answers.

What table sizes bonding jumpers for for AC systems? 250.102(C)(1) The NEC defines continuous load to be a load where max current on the circuit continues for at least how many hours? Three 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? Greater than three Where in the NEC codebook would you find EMT sizes for a given size and number of conductors? Annex C, Table C.1 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. 125% Liquidtight Flexible Metal Conduit shall be fastened within of each box or other conduit termination Twelve 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. Eight Chapter 9 note 4 states conduit nipples less than 24 inches can fill to a max of their cross sectional area 60 percent Table 348.22 gives the max number of insulated conductors in size _______ FMC? 3/8 (trade size) Guest rooms of hotels, motels, & sleeping rooms in dorms need a MIN or _____ general purpose receptacles installed that are readily accessible? Two 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 B: 90 degrees C Ref: 410.68 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 C: 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. Class 1 Class ____ locations are those that are hazardous because of combustible dust Class II Conductors with _______ Insulation have a greater ampacity when used in a dry location compared to when used in a wet location THHW 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? Demand load (1.25) Table C.11 and C.11(A) show conductor numbers for size for schedule 40 PVC, what is the difference in charts? Compact vs stranded conductors 332.30 states that type MI cable shall be supported at intervals of at least how many feet? Six feet What table sizes equipment grounding conductors for specific over current devices? 250.122 Wye is another term for what kind of systems? Three phase What is the equation for voltage drop? VD=2KID/CM In the voltage drop equation, what is the value CM, and where is it found in the NEC codebook? Circular mile, chapter 9, table 8 Conductors installed under at least _______ inches of concrete are considered by NEC Section 230.6 to be outside the building. 2 inches Conductors installed in electrically heated floors in bathrooms, kitchens, and in hydro massage bathtub locations shall be provided with what kind of protection? GFCI 424.44(E) With 90 kVA and 208Y, what is the current on each ungrounded phase conductor at full load? 90kVA/(208X1.732) 250 amps For dwelling units, GFCI protection shall be provided for lighting outlets not exceeding 120 volts where installed in Crawl spaces 430.32 gives percentages for marked service factors on motors. For 40 degrees C or less and 1.15, what is the percentage you multiply by? 125% 422.13 states fixed storage water heaters with a capacity of ____ gallons should be considered a continuous load for sizing branch circuits 120 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? 30 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 20 ampere What section of the NEC discusses corrosion protection? 300.6 300.6 says that where corrosion protection is necessary and the conduit is threaded in the field, the threads shall be coated with what? An 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? Dedicated electrical space For single phase dwelling services, when sizing conductors, 100-400 amps, what do you multiply your ampacity by to derate? 83 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 2 times 240.22 states no over current device shall be connected in series with any conductors The 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? 100 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 "B" phase Where in the codebook would you find info about the minimum clearance for conductors passing over a public driveway? 225.18(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 25% Where in the code would you find information about conduit seals? Hazardous locations Table 300.5 shows what for different types of wiring methods or circuits based on the location? Minimum 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? 12 feet conductors supplying several motors, or a motor and other loads, shall have an ampacity equal or greater than the sum of what? 125% flc of biggest motor + flc of all other motors + 100% of noncont non motor load + 125% of cont non motor load