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THE NCCER ELECTRICAL CERTIFICATION TEST
LATEST 2025 WITH 300 EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS 2025
(MOST RECENT)
"What test or equipment can be used to locate a suspected short circuit in 1- phase of a 3-phase motor?
- CORRECT ANSWER=> "megger"" "What will happen if moisture is inside a cad weld mold while the weld is being performed? - CORRECT ANSWER=> The cadweld mold could explode" "What is produced in a conduit run by making 2 equal bends in opposite direction? - CORRECT ANSWER=> Offset" "4-inch square boxes are available with all of the following depths EXCEPT - CORRECT ANSWER=> 1 inch" "What is installed at an expansion joint to provide a continuous ground between 2 sections of cable tray?
- CORRECT ANSWER=> A bonding jumper" "What color identifies an insulated, grounded number 4 conductors? - CORRECT ANSWER=> Green" "Why is it important to torque bolts when busbars are connected? - CORRECT ANSWER=> Decreases resistance on the connection" "All the following are protective devices for motors EXCEPT - CORRECT ANSWER=> SOLENOID" "Service conductors are sized based on what factor? - CORRECT ANSWER=> The total calculated load of the building" "A holding contact na motor starter is normally connected in parallel with the - CORRECT ANSWER=> Start push button" "The number of complete AC cycles per second is called the - CORRECT ANSWER=> Frequency" "Which of the following components is part of a dual element fuse - CORRECT ANSWER=> Rejection clip" "The potential across the circuit is 480 volts and the current is 50 amps. What is the resistance of the circuit? - CORRECT ANSWER=> 9.6 ohms"
"What NEC table indicates the size of service conductors? - CORRECT ANSWER=> Table 310-16" "What instrument is used to measure CURRENT? - CORRECT ANSWER=> Ammeter" "What are the 3 elements in every electrical circuit? - CORRECT ANSWER=> Power source, switch, and load" "When the coil turns are increased the _____ - CORRECT ANSWER=> Induced voltage is increased" "As the temperature surrounding a self-regulating heating cable rises, the ____ - CORRECT ANSWER=> Resistance of the polymeric core increases" "The motor type that has the highest starting torque is the ____ motor. - CORRECT ANSWER=> Capacitor-start" "For a given number of poles, the ____ determines the speed of an AC motor. - CORRECT ANSWER=> Frequency" "Both induction and synchronous motors operate on the principle of a rotating ____ field - CORRECT ANSWER=> Magnetic" "A transformer has 200 turns in the primary, 150 turns in the secondary, and 120VAC applied to the primary. The voltage across the secondary is: - CORRECT ANSWER=> 90Volts" "The output capacity of a motor is rated in - CORRECT ANSWER=> Horsepower" "The synchronous speed at which a pole, 60 Hz induction motor operates is rpm. - CORRECT ANSWER=> 1,800" "The sine of 0 degree is - CORRECT ANSWER=> 0" "Meters used in AC circuits indicate the - CORRECT ANSWER=> Effective" "The component labeled 7 in figure 1 is a(n) - CORRECT ANSWER=> End seal" "In an AC circuit containing resistance only _____ will flow if the resistance is 10 ohms and the voltage is 120V. - CORRECT ANSWER=> 12A" "The _____ rotor types are generally rugged. - CORRECT ANSWER=> Squirrel cage" "Proofs tests are made at_ of the original factory voltage. - CORRECT ANSWER=> 60%" "Which type of heating cable cannot be cut and terminated in the field? - CORRECT ANSWER=> Mineral insulated"
"What does HOA usually mean in a motor control circuit? - CORRECT ANSWER=> Hands of Automatic" "What is the standard wire size system used in the United States? - CORRECT ANSWER=> AWG" "A switch labeled "AL-CU" can be used with what type of wire? - CORRECT ANSWER=> Aluminum Copper or Copper Clad Aluminum" "What type of conduit fitting is usually placed in the middle of a long run of rigid metal conduit to provide access for pulling wire? - CORRECT ANSWER=> C" "What is the largest size of aluminum rigid conduit couplings? - CORRECT ANSWER=> 6"" "What is the purpose of the thermocouple? - CORRECT ANSWER=> To measure temperature" "A brass-colored terminal on a receptacle indicates that it should be used to connect what type of wire?
- CORRECT ANSWER=> Hot wire" "What is the standard length of rigid conduit? - CORRECT ANSWER=> 10 FT" "An angle or U-pull is made with 14 wire or larger. The distance between each raceway entry inside the box and the any less than how many times the trade opposite wall of the box shall NOT be diameter of the largest raceway? - CORRECT ANSWER=> 6 times" "Where should stress cone be used? - CORRECT ANSWER=> High Voltage Termination" "A cable rated for 5KV insulation can safely carry what MAXIMUM voltage? - CORRECT ANSWER=> 5, volts" "What is the PRIMARY consideration in selecting the proper rope for a cable pull? - CORRECT ANSWER=> Safety" "Which of the following statements describes the operating features of a thermal overload relay? - CORRECT ANSWER=> The greater the overload, the shorter the time of tripping." "Normally, the easiest place to reverse the leads to change the direction of rotation of a 3-phase motor is at the - CORRECT ANSWER=> Motor Starter" "What is the largest size conductor that can terminate on a 20amp receptacle? - CORRECT ANSWER=> 12awg" "Why can a lead acid battery be an explosive hazards? - CORRECT ANSWER=> Hydrogen gas is produced during charge and discharge"
"What MAXIMUM number of bends is allowed between fittings in one conduit run? - CORRECT ANSWER=> 4 quarter bends or 360 degrees" "What size wire is standard for a 120- volt motor control systems? - CORRECT ANSWER=> #14" "In all cases where live parts are normally exposed on the front of switchboards or motor control centers the working space in front of such equipment MUST be what MINIMUM length? - CORRECT ANSWER=> 3Ft" "What is the interrupting rating of a fuse? - CORRECT ANSWER=> The maximum value of current that the fuse is designed to interrupt" "What is the PRIMARY purpose of P&ID? - CORRECT ANSWER=> Provides scale drawings and piping and instrumentation control systems" "A "megger" will be used to check a cable. The electrician MUST be sure thát the circuit is - CORRECT ANSWER=> De-energized and locked, tagged out, and tested" "What is the symbol for the primary side of a transformer? - CORRECT ANSWER=> H" "What is the function of a ballast in a flourescent fixture - CORRECT ANSWER=> Steps up the voltage" "An electrical fitting can be made explosion proof in which of the following ways - CORRECT ANSWER=> Using an amorphous sealed device" "Cable trays are usually supported by all the following means EXCEPTS? - CORRECT ANSWER=> #9 wire" "A 1 line diagram with simplified symbols indicates the - CORRECT ANSWER=> Interconnections and component parts of an electrical circuit" "What is the purpose of Lockout/Tagout? - CORRECT ANSWER=> Prevents operation" "Which of the following factors is used to control the speed of an induction motor? - CORRECT ANSWER=> Frequency" "A 10-inch offset at 30 degrees is being made. What is the distance between center-to-center bends? - CORRECT ANSWER=> 20 inches" "What is an acceptable protection techniques for electrical equipment in hazardous locations? - CORRECT ANSWER=> Use duct-ignition proof equipment" "How does a battery produce voltage? - CORRECT ANSWER=> Chemical reaction"
"To properly install a compression lug on a conductor REQUIRING multiple crimps, the electrician will crimp? - CORRECT ANSWER=> Starting from the lug eye to the barrel opening" "When should a de-oxide compound be used? - CORRECT ANSWER=> During an aluminum to copper connection" "What should be used on every wire pull through conduit? - CORRECT ANSWER=> Wire lube" "Given: the distance between a starter and a 3-phase motor is 73 ft. the started MUST have a Sft tail and the motor a 3ft tail. How much multi-conductor wire is REQUIRED for a pull from the starter to the motor? - CORRECT ANSWER=> 81ft" "What type of circuit breaker was developed to meet the needs of systems where high potential fault- currents are present? - CORRECT ANSWER=> Current-limiting" "Where are the overload heaters normally located in a motor circuit? - CORRECT ANSWER=> In the motor starter between the "T" leads and the contactors" "A heat trace cable is installed on a line that will be insulated. When will the cable be "megged"? - CORRECT ANSWER=> Before and after the insulation is put on the line" "Voltage has been stepped-down in a transformer. What happens to the current in the secondary - CORRECT ANSWER=> It decreases" "A VOM measures - CORRECT ANSWER=> Ohms, amps, and volts" "The standard unit for measuring the cross-sectional area of wire is the - CORRECT ANSWER=> CIRCULAR MIL" "??? are intended for the electrical protection of personnel. - CORRECT ANSWER=> GFCIS" "If a circuit has 10 amps of current and 12 ohms of resistance, the applied voltage is - CORRECT ANSWER=> 120" "A Type ?? conduit body has a threaded straight hub on each end and another threaded hub perpendicular to these two. - CORRECT ANSWER=> T" "The test leads of a megger should never be touched when it is in use because - CORRECT ANSWER=> The generator voltage is present on the test leads and could result in electrical shock" "The purpose of an insulated bushing at raceway termination points is to - CORRECT ANSWER=> Protect the conductors from being damaged" "A voltmeter is connected in. - CORRECT ANSWER=> Parallel with the circuit"
"Solid bottom metal cable tray with solid metal covers may be used in - CORRECT ANSWER=> Environments airways excluding ducts and plenums for environmental air" "The indication provided by a voltage tester represents ____ - CORRECT ANSWER=> That there is a potential difference between 2 points" "What does a watt meter indicate? - CORRECT ANSWER=> True power" "When transporting metal conduit, it is important to - CORRECT ANSWER=> Protect the threads keep the caps on to prevent thread damage" "The voltage drop of conductors carrying AC in PVC conduit will have what relation to that of identical conductors in the conduit - CORRECT ANSWER=> The same" "Which of the following is the "heating element" in a self- regulating heat trace? - CORRECT ANSWER=> Semiconducting core" "Intermediate metal conduit (IMC) is a type of conduit that - CORRECT ANSWER=> Has a wall thickness less than that of rigid metal conduit but thicker than EMT" "According to Ohm's Law, the amount of current in a circuit is equal to the - CORRECT ANSWER=> Voltage divided by the resistance" "The voltage of a DC circuit to be measured. How should the meter be connected to ensure proper polarity? - CORRECT ANSWER=> The (-)with the (-) and the (+) with the (+)" "Electrical metallic tubing must be supported with what maximum distance from each junction or outlet box? - CORRECT ANSWER=> 3ft" "What type of wire is standard for low-voltage milliamp signal system? - CORRECT ANSWER=> Single pair shielded" "A 3 way switch, is what typeof switch/ - CORRECT ANSWER=> SPDT" "The number of complete AC cycles per second is called? - CORRECT ANSWER=> Frequency" "All of the following are found on an elevation view of a motor control center, EXCEPT - CORRECT ANSWER=> LOCATION OF MOTOR" "What color wire is connected to the silver screw in an incandescent fixture? - CORRECT ANSWER=> White" "Receptacles are rated according to the - CORRECT ANSWER=> Voltage and amperage capacity"
"What is the maximum voltage of conductors on which wire nuts may be used for interior wiring? - CORRECT ANSWER=> 600 volts" "How is metering of electricity accomplished for services rated greater 400 amps? - CORRECT ANSWER=> By using a CT metering" "The terminations on a motor starter are tightended incorrectly, what may happen? - CORRECT ANSWER=> It will create an ARC and increase the amperage the motor is pulling" "A section of a cable tray that makes 2 vertical 90 degree turns is known as? - CORRECT ANSWER=> A vertical "T"" "What should be done to change the rotation of a 3-phase motor? - CORRECT ANSWER=> Swap any two leads" "What is the typical voltage of a control transformer for 3-phase, 480 volt starter - CORRECT ANSWER=> 110 volts" "Which of the following determines the pulling force applied to the cable when using a tugger? - CORRECT ANSWER=> The number of wraps on the tugger drum" "What is the maximum allowance fill when installing 3 or more conductors in a conduit? - CORRECT ANSWER=> 40%" "Which of the following conductors has the least resistance? - CORRECT ANSWER=> 1/0 awg" "All things considered, the most ideal conductor is? - CORRECT ANSWER=> Сopper" "All of the following apply to the installation of junction boxes, splices boxes, and pull boxes except that they must be? - CORRECT ANSWER=> Metal" "A box has two 12/2 with ground cables in it, all like-colored wires have been spliced and "pigtail", how many #12 conductors should be counted in the box fill? - CORRECT ANSWER=> 5" "Which of the following abbreviations describe the inturrpting capacity of a circuit breakers of fuses? - CORRECT ANSWER=> AMP" "What part of the motor starter protects the motor if there is a problem in the system? - CORRECT ANSWER=> Overload relay" "What is the voltage drop for a 208V single-phase circuit with a load of 2615 amps, using #8 copper conductor (16,510 circular mil) at a circuit length of 145ft? - CORRECT ANSWER=> 5.20"
"The purpose of a rectifier is to - CORRECT ANSWER=> Convert AC into DC" "How is a transformer rated for power output? - CORRECT ANSWER=> Volt-amperes" "Which of the following is the most severe hazardous classification? - CORRECT ANSWER=> Class 1, division 1" "What is the term for a transformer whose primary and secondary circuit have part of a winding in common? - CORRECT ANSWER=> The 2 circuit are not isolated from each other. Auto transformer" "All of the following rating appear on a circuit breaker nameplate, except - CORRECT ANSWER=> Rated wattage" "The trip rating of a circuit breaker used in the main proctective device in a panelboard cannot exceed? - CORRECT ANSWER=> The total amp of the branch breakers" "A transformer has a turn ratio of 5:1, what will be the voltage on the secondary if primary voltage is 120v? - CORRECT ANSWER=> 24 volts" "Which of the following types are raceways is approved for use in class 1 division 1 hazardous location? - CORRECT ANSWER=> Rigid metal conduit" "Which of the following would be found in a class 1 location? - CORRECT ANSWER=> Three threads on conduit connections" "The drawing scale is (most) likely to be found in which of the following drawing location? - CORRECT ANSWER=> The drawing title block" "To slightly change elevation of a cable tray - CORRECT ANSWER=> Swivel plates" "Heat trace cable should never cross itself except? when cable is - CORRECT ANSWER=> temperature self limited" "When climbing a scaffold you need? - CORRECT ANSWER=> Yo yo" "When you double resistance and amperage, what happens to the current? - CORRECT ANSWER=> Its stays the same" "Which of the following should be used to cool dry a transformer? - CORRECT ANSWER=> Fans" "Which of the following statements is (true) about intrinsically safe equipment? - CORRECT ANSWER=> Such equipment can be used in hazardous locations"
"A conduit bending Hickey can be used to bend conduit from? - CORRECT ANSWER=> 0-15 degrees" "All of the following information is found on a one-line diagram of a substation EXCEPT? - CORRECT ANSWER=> The Scale" "What are the 3 elements in every electrical circuit? - CORRECT ANSWER=> Power source, wire, and load" "What are the 2 most commonly used methods of terminating grounding? - CORRECT ANSWER=> Exothermic (caldwelding) and mechanical" "Chico sealing compound is to be applied in an EYD fitting, the electrician must make sure that? - CORRECT ANSWER=> The drain remains clear" "The point of attachment of service drop conductors (must) provide minimum clearance as specified in what NEC table? - CORRECT ANSWER=> 230-24" "The color of the outer finish required to mark a phase busbar or the conductor having the higher voltage to ground is? - CORRECT ANSWER=> Orange" "How does a battery produce voltage? - CORRECT ANSWER=> By chemical reaction" "Which of the following should be used to cool dry a transformer? - CORRECT ANSWER=> Fans" "What does thermal overload protect in a starter or MCC? - CORRECT ANSWER=> The Motor" "How are the primary leads identified in a transformer? - CORRECT ANSWER=> H1, H2, H3" "What test equipment can be used to locate a suspected short circuit in one phase of a 3phase motor? - CORRECT ANSWER=> Megger" "Normally you would need all of the following in a wire pull operation EXCEPT? - CORRECT ANSWER=> Scaffolding" "Which of the following components is part of a DUAL ELEMENT FUSE? - CORRECT ANSWER=> Time Delay" "A holding contact in a motor starter normally connected in parallel with? - CORRECT ANSWER=> The start push button" "The potential across the circuit is 480 volts and the current is 50 amps, what is the resistance of the circuit? - CORRECT ANSWER=> 9.6 ohms"
"A device labeled CO/ALR can be used with ______ wire. - CORRECT ANSWER=> Aluminum, copper, or copper-clad aluminum" "Specific data for a hazardous material is found in? - CORRECT ANSWER=> The MSDS" "The type and size of overcurrent protection may be found in the - CORRECT ANSWER=> Panelboard schedule" "The requirements and proper applications of boxes and fittings can be found in - CORRECT ANSWER=> NEC Section 300-15" "After a hazard review is completed, ________ determine(s) the classification of a confined space as a nonpermit or permit-required confined space - CORRECT ANSWER=> The supervisor and project/safety managers" "When busbars are secured to withstand the torque created by the available amount of short circuit current, they are said to be? - CORRECT ANSWER=> Braced" "It is not a good idea to use needle-nose pliers to bend wire in preparation for a termination because? - CORRECT ANSWER=> Gripping the conductor and bending it with needle-nose pliers can scar or weaken the conductor" "The correct receptacle terminal and wire color code is? - CORRECT ANSWER=> Green terminal- ground wire, silver-white conductor, brass-black conductor" "A sectional drawing is a? - CORRECT ANSWER=> Cutaway view of a building or object" "When splicing small sizes stranded conductors using crimp-type connectors ______ may be a problem - CORRECT ANSWER=> Lost strands" "Where several conductors are pulled together, they should be arranged ______ on the fish tape. - CORRECT ANSWER=> Staggered" "Of the 16 usual divisions found in written specifications, Division_deals mainly with electrical work. - CORRECT ANSWER=> 16" "The NEC states that? - CORRECT ANSWER=> All disconnect devices for circuits, feeders, and equipment must be clearly and permanently marked to show their purpose unless clearly evident" "Staggered Utility metering equipment is used to_____ of an electrical service. - CORRECT ANSWER=> Measure the power consumption" "_____ conduit is too thin to be threaded. - CORRECT ANSWER=> EMT"
"When working on deenergized circuits that have capacitors installed, the first thing that should be done is to? - CORRECT ANSWER=> Short out all parts of the circuit with a shorting prove and leave the probe connected to the circuit" "When using a straight ladder, the side rails should extend at least______above the top support point. - CORRECT ANSWER=> 36 inches" "The number of wraps on the _____ decides the amount of force applied to the pull. - CORRECT ANSWER=> Puller drum (capstan)" "The primary advantage of using recording instruments is that they? - CORRECT ANSWER=> Can be connected to take and record continuous measurements" "Cable splice are allowed in cable tray systems provided they are? - CORRECT ANSWER=> Made and insulated by NEC approved methods" "The maximum pull that should be exerted on cables being pulled in tray when using a basket grip is _____ pounds. - CORRECT ANSWER=> 1,000" "The abbreviation for an entrance ell (elbow) - CORRECT ANSWER=> SLB" "The outer shielding in a high voltage cable is best described as_. - CORRECT ANSWER=> A semi- conductive layer under a metallic layer" "The best application for a shaded pole motor is. - CORRECT ANSWER=> Small fans" "The difference between the synchronous speed and the speed of the rotor in an induction motor is known as? - CORRECT ANSWER=> Slip" "The amount of pulling force with 3 wraps and 10 pounds of operator force is ???? pounds. - CORRECT ANSWER=> 106" "Portable electric hand tools account for a larger number of electrical shock injuries. The majority of these of accidents could have been prevented by - CORRECT ANSWER=> Proper grounding of tools" "The maximum number of current carrying conductors at åny cross section of a wireway is? - CORRECT ANSWER=> 30" "In AC circuits containing only resistance ____ - CORRECT ANSWER=> All DC rules and laws apply, including Ohm's law and Kirchoff's law" "The tough outer covering for mechanical protection of cable is called the - CORRECT ANSWER=> Jacket" "In an inductive circuit, the current 180 degree is. - CORRECT ANSWER=> 0"
"Inductance ______ - CORRECT ANSWER=> Opposes any changes in circuit current" "Electric heåt tracing of pipelines is done for all of the following reasons EXCEPT? - CORRECT ANSWER=> To eliminate standard thermal insulation" "If the original rubber insulation on a straight splice was " thick, what is the minimum size that it should be after it is built up? - CORRECT ANSWER=> 3/8"" "The average voltage value in a circuit wjth a peak voltage of 170V is? - CORRECT ANSWER=> 108V" "A grounding electrode conductor must be connected _____ of a main distribution panel. - CORRECT ANSWER=> To the neutral terminal bus" "Rod, pipe, and plate electrodes must have a resistance to ground of _____ ohms or less. - CORRECT ANSWER=> 25" "Which of the following best describes a high voltage termination? - CORRECT ANSWER=> An insulator" "In unlike wound transformers, the primary and secondary voltages are? - CORRECT ANSWER=> 180 degrees out of phase" "A transformer with 100 turns in its primary coil and 10 turns in its secondary coil is a_ transformer. - CORRECT ANSWER=> Step-down" "The FLA rating of a motor will be found on the. - CORRECT ANSWER=> Nameplate" "If the frequency of an AC circuit is 15 cycles per 4 second, the hertz rating of the circuit is - CORRECT ANSWER=> 60HZ" "A quick test that can be made to determine if an installation is good is known as a(n) _ test. - CORRECT ANSWER=> Go/No Go" "The most common services factor appearing on a motor's nameplate is - CORRECT ANSWER=> 1.15" "All of the following connectors may be used for splicing high voltage cable EXCEPT? - CORRECT ANSWER=> Split-bolt connectors" "The self-induced voltage across an inductance L is produced by a change in current with respect to - CORRECT ANSWER=> Time" “Which Article of the NEC covers grounding? - CORRECT ANSWER=> article 250" "Which of the following is a 90-degree, explosion proof fitting? - CORRECT ANSWER=> GUAL"
"A transformer with the primary of 400 turns and a secondary of 300 turns has a _____ - CORRECT ANSWER=> Step-down turns ratio of 4:3" "The circular mil is based on the - CORRECT ANSWER=> Cross-sectional area of the wire" "Of the termination classes listed below, ____ is the only one that provides a seal against external elements. - CORRECT ANSWER=> Class 1" "Unless otherwise noted. the calculations in AC circuits _____ values. - CORRECT ANSWER=> Rms"
