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Master Electrician Exam Review –
Electrical Trade Certification – study
material
branch circuit - correct answer ✔✔That portion of a wiring system extending beyond the final overcurrent device is called the: Calculated load - correct answer ✔✔The final sum of the computed loads, based on the minimum code requirements, is the Resistance - correct answer ✔✔As compared to #10, a #8 wire of the same Iength has less: 0.001 inch - correct answer ✔✔One circular mil is the area of a circle whose diameter is: 1,000,000 cm - correct answer ✔✔A round bus-bar one inch in diameter, has a circular mil area of: four times as great - correct answer ✔✔A copper wire with twice the diameter of another wire has a current carrying capacity: 10.4 - correct answer ✔✔The specific resistance of copper wire @ 20° C in ohms per circular mil ft. is permit current to flow - correct answer ✔✔Conductance of an electric circuit is that property that will: 1O ohms - correct answer ✔✔The equivalent value of 0.1 mho is
directly proportional to its length - correct answer ✔✔The resistance of copper wire is: Feeder - correct answer ✔✔The portion of a wiring system between a point of distribution and the branch circuit overcurrent device is locking - correct answer ✔✔GFCI protection at a carnival is not required for equipment at circuit if the receptacle is of the ____________type not less than 1 1/4 in. from - correct answer ✔✔Where cables or nonmetallic raceways are installed through bored.holes in joists, rafters, or wood members;holes shall be bored so that the edge of the hole is the nearest edge -of the wood member. located on a balcony accessible only to qualified persons located in a room only accessible to qualified persons elevated 8 ft or more above floor or other working surface - correct answer ✔✔To guard live parts over 50V but less than 600V, equipment is permitted to be 12Ft - correct answer ✔✔Overhead feeder conductors shall have a minimum __________ vertical clearance over residential property and driveways, as well as those commercial areas not subject to truck traffic, where the voltage is limited to 300 volts-to-ground. 36 inches - correct answer ✔✔Where rear access is required to work on de- energized parts on the back of enclosed equipment, a minimum working space of horizontally shall be provided.
5' - correct answer ✔✔Lighting track shall not be installed less than______ above the finished floor except' where protected from physical damage or where the track operates at less than 30 V rms, open-circuit voltage 4 - correct answer ✔✔Each general care area patient bed location shall be provided with a minimum of_______receptacles, which can be single, duplex, or a combination with each duplex counting as two receptacles Combination Range hood/ Microwave oven - correct answer ✔✔In a Dwelling Unit which appliance is allowed to have a 24" cord with attachment ground plug? 1 - correct answer ✔✔At least_____ 125 V, single phase, 15 A or 20 A, duplex with ground-fault circuit interrupter receptacle shall be provided in each elevator machine room and elevator machinery space. 25A - correct answer ✔✔Lighting systems covered by Article 411 shall have a power supply rated not more than______and not more than 30V 90 - correct answer ✔✔Temporary electrical power and lighting installations shall be permitted for a period not exceeding ____days for Christmas decorative lighting and similar purposes 10' - correct answer ✔✔Lighting systems operating at 30V or less shall not be·installed within_______of pools, spas, fountains, or similar locatipns 12 /40 - correct answer ✔✔Where communications wires and cables and electric light or power conductors are supported by the same pole and are run paralled to each other in span , the·supply service drops of 0-750 volts running above and parallel to communications service drops shall have a minimum separation of _______inches at any point in the
span, including the point of and at their attachment to the building, provided the nongrounded conductors are insulated and that a clearance of not less than_______ inches is maintained between the two services at the pole 8 - correct answer ✔✔Communications Wires and cables shall have a vertical clearance of not less the ______feet from all points of roofs above which they pass. Cable Tray - correct answer ✔✔MV cable rated 35 KV cannot be installed in in a straight line - correct answer ✔✔The grounding of communications wires should be run to the grounding electrode: 10 AWG Copper - correct answer ✔✔Service Lateral conductors that supply power to limited loads of a single branch circuit-such as a small polyphase power, controlled water heaters, and similar loads-shall not be smaller than 35KV - correct answer ✔✔Dry type transformers installed indoors rated over._______ shall be installed in a vault. 1 1/2" - correct answer ✔✔Flat:top underfloor raceways over 4 inches, but less 8 inches wide, with a minimum 1 inch spacing between raceways, shall be covered with concrete to a depth of not iess than 1 inch. Raceways spaced less that 1 inch apart shall be covered with a concrete to a depth of 48 times - correct answer ✔✔For straight pulls, the length of a pull box shall not be less than _____ time the outside diameter, over the sheath, of the largest shielded ·or lead covered conductor or cable entering the box on systems over 600 volts
shall not be opened under load can be used only as isolating switch - correct answer ✔✔Knife switches rated for more 1200 amps at 250v or Less ______ 6' - correct answer ✔✔outlets may be installed in a dwelling unit for specific appliance such as laundry equipment What is the maximum distance allowed between this outlet and the appliance? white or gray - correct answer ✔✔When leads are supplied with lamp holders the conductor attached to the screw shell shall have a _______finish. 25' - correct answer ✔✔A 125-volt, single-phase, 15- or 20- ampere-rated receptacle outlet shall be installed at an accessible location for the servicing of heating, air conditioning, and refrigeration equipment The receptacle shall be located on the same level and within ______of the heating, air- conditioning, and refrigeration equipment The receptacle outlet shall not be connected to the load side of the equipment disconnecting means 12 feet - correct answer ✔✔The verticaI clearance from ground level over a residential driveway for overhead service conductors not subject to truck traffic and are less than 300 volts to ground shall be _____ ft: 20A - correct answer ✔✔Two or more ______small-appliance branch circuits shall be provided to supply power for receptacle outlets in the dwelling unit kitchen, dining_ room, breakfast room, pantry, or similar dining areas 6 AWG - correct answer ✔✔An insulated grounded conductor of_______or smaller shall be identified by a continuous white or gray outer finish; or by
three continuous white stripes on other than green insulation along its entire length four - correct answer ✔✔A load demand factor of 75 percent is permitted for _____or more appliances fastened in place such as waste disposals, dishwashers, trash compactors, water heaters, etc, Four - correct answer ✔✔A hospital is a building or portion there of used for the medical, psychiatric, obstetrical, or surgical care, on a 24-hour basis, of _____ or more patients Accessible non current-cariying metal parts are required to be connected to an equipment grounding·conductor. - correct answer ✔✔Which of the following statements best describes the grounding requirements for central vacuum outlet assemblies? USE - correct answer ✔✔Type______ is a multi conductor cable identified for use as underground service-entrance cable Earth does not Carry significant current to open over current device - correct answer ✔✔A light post with no equipment ground. But there are two separate ground rods with 25 ohms to ground. What will happen if there is a ground fault? 18 feet - correct answer ✔✔The minimum clearance for overhead feeder conductors not exceeding 600V that pass over commercial areas Subject to truck traffic is.
have their location identified by a warning ribbon that is placed in the trench at least_______inches above the underground installation for 40KV 10 feet - correct answer ✔✔Nonmetallic cables can enter the top of surface- mounted cabinets, cutout boxes, and meter socket enclosures through nonflexible raceways not less than 18 in. or more than ______ft in length if all of the required conditions are met. 5 times - correct answer ✔✔Bending radius in type AC cable should be at least _____ the diameter of the AC Cable 8 AWG - correct answer ✔✔What is the minimum size of an overhead service drop 8" - correct answer ✔✔What is the minimum thickness of a transformer vault floor made up with bricks or cement filled blocks 30" - correct answer ✔✔What is the min Horizontal Climbing Space on a power conductors below communication conductors 125% - correct answer ✔✔Branch circuit conductor that supply a single motor used in a continuous duty application shall have an ampacity of not less than Percent of the motors full-load current 5/7 - correct answer ✔✔Where service equipment totaling 1000 KVA, or larger is installed separately, or as part of a switchboard, the room in which such switchboard is located shall be constructed of noncombustible materials having a two hour fire rating and shall be of dimensions adequate to house the switchboard and to provide the following minimum clearances: At least _____Feet in front of the switchboard if if is in one line, and at least_______ Feet in
front of the board if boards are installed facing each other Over 100 Lbs - correct answer ✔✔What is the weight in lbs, of a manhole cover that is use to keep out unqualified persons from accessible to opening the manhole? One - correct answer ✔✔How many receptacles are required within the perimeter of a balcony, deck or porch with a useable area of less than 20 SQ. feet 26" - correct answer ✔✔Access openings in a manholes shall be not less than: 700 - correct answer ✔✔A service switchboard sized over 5000 amps with a 100% rating shall have copper bus bars sized on an ampacity of _____per square inch 1200 Amperes - correct answer ✔✔19. When an equipment room houses electrical equipment rated at LEAST _____or more, the personnel doors intended for entrance to and egress from the working space, shall open in the direction of egress. protective barrier or a fixed ladder shall be provided - correct answer ✔✔Manhole openings for personnel shall be located where they are not directly above electrical equipment or conductors inthe enclosure. Where this is not practicable 3 - correct answer ✔✔The maximum total voltage drop on branch-circuit conductors is _______Percent
50' - correct answer ✔✔Where this code specifies that one equipment shall be "in sight from", "within sight from" or ''within sight of', and so forth, another equipment, the specified equipment is to be visible and not more than ______ distant from the other 36" - correct answer ✔✔Where rear access is required to work on de- energized parts on the back of enclosed equipment, a minimum working Space of _______horizontally shall be provided two - correct answer ✔✔The number of receptacle outlets for guest rooms in hotels and motels shall not be less than that required for a dwelling unit These receptacles can be located to be convenient for permanent furniture layout but at least _____receptacle outlets shall be readily accessible Refrigerator or Electric Clock - correct answer ✔✔A receptacle connected to one of the dwelling unit small applicance branch circuits can be used to supply an _______ in any of the rooms specified in 210.52(B)(l) 50% - correct answer ✔✔Dwelling units circuits running through another dwelling unit in common areas. What percentage of change, will require it to be brought up to current code 20 amp - correct answer ✔✔There shall be a minimum of one branch circuit for laundry outlets required by 210. 30" - correct answer ✔✔The working space in front of the electric equipment shall not be less than wide, or the width of the equipment, whichever is greater.
physical damage - correct answer ✔✔In locations where electrical equipment is likely to be exposed to ________ enclosures or guards shall be so arranged and of such strength as to prevent such damage. Conductance - correct answer ✔✔The reciprocal of resistance Energy - correct answer ✔✔A watt-hour meter is used to measure 0.622" - correct answer ✔✔The internal diameter of 1/2"EMT is: 116 Conductors - correct answer ✔✔What is the Max number of #6 THHN current carrying conductors in 4" EMT for general use is 40% - correct answer ✔✔The total cross sectional area of conductors (not lead covered) in a new conduit.with four wires shall not exceed: 1.5" - correct answer ✔✔The outside diameter of a threaded rigid conduit is measured to be about two Inches. The nominal trade size is: 6" - correct answer ✔✔A field bend of a one inch rigid conduit, for RH wire, shall have a minimum radius of Sizes are specified by Nominal inside Diameter - correct answer ✔✔Concerning rigid conduit used for electrical work: 13 - correct answer ✔✔How many receptacle outlets are permitted .on a 20A. 120V ircuit in a commercial building?
1000A - correct answer ✔✔Ground fault protection of equipment shall be provided for solidly grounded wye electrical services of more than 150 volts- to-ground, but not exceeding 600V phase-to-phase for each service disconnecting means rated __________ #4 cooper & #2 Aluminum - correct answer ✔✔What is the minimum size Service Conductor allowed for a dwelling unit 4% - correct answer ✔✔The maximum voltage drop from Service point to the last overcurrent device in a dwelling unit? for the practical safeguarding of persons and property - correct answer ✔✔The NEC is ______ an electrical system essentially free from hazard - correct answer ✔✔Compliance with the provisions of the NEC will result in a. efficient use ,convenience, good service or future expansion·of electrical use - correct answer ✔✔The Code contains provisions considered necessary for safety, which will not necessarily result in overloading of wiring systems by methods or usage not in conformity with the NEC, initial wiring not providing for increases in the use of electricity - correct answer ✔✔Hazards often occur because of True - correct answer ✔✔The Code isn't a design specification standard or instruction manual for the untrained and unqualified
signaling, electrical conductors, equipment, and raceways, communications - correct answer ✔✔The following systems shall be installed in accordance with the NEC requirements: electrical conductors and equipment, optical fiber cables within or on public and private buildings, outside conductors and equipment on the premises - correct answer ✔✔The NEC applies to the installation of True - correct answer ✔✔The NEC does not cover electrical installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehicles. Accessible (as applied to equipment) - correct answer ✔✔Admitting close approach, not guarded by locked doors, elevation, or other effective means, is referred to as accessible, readily. - correct answer ✔✔Capable of being reached quickly for operation, renewal, or inspections without resorting to portable ladders and such is known as accessible (as applied to wiring methods) - correct answer ✔✔Capable of being removed or exposed without damaging the building structure or finish, or not permanently· closed in by the structure or finish of the building is known as Ampacity - correct answer ✔✔The current in amperes a conductor Ca.n carry continuously, where the temperature will not be raised in excess of the conductor's insulation temperature rating is called its_· approved - correct answer ✔✔Acceptable to the authority having jurisdiction means
concealed - correct answer ✔✔Cables are considered if rendered inaccessible by the structure or finish of the building conduit body - correct answer ✔✔A separate portion of a raceway system that provides access through a removable cover to the interior of the system, defines the term ________ Three Hours - correct answer ✔✔A load is considered to be continuous if the maximum current is expected to continue for ______ or more selective coordination - correct answer ✔✔The ·choice of overcurrent protective devices so that an undercurrent condition will be localized and restrict outages to the circuit or equipment affected, is called Cutout boxes - correct answer ✔✔_______ are designed for surface mounting with a swinging door demand factor - correct answer ✔✔The ________of any system is the ratio of the maximum demand of a system, or part of a system, to the total connected load of a system. device - correct answer ✔✔A unit of an electrical system that carries or con1trols electric energy as its principal function is a(n) disconnecting means - correct answer ✔✔A(n) _______is a device by which the conductors of a circuit can be disconnected from their source of supply
dwelling unit - correct answer ✔✔A_______is a single unit that provides independent living facilities for persons, including permanent provisions for living, sleeping, cooking, and sanitation.
