3A Electrical Practice Test

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• What does it mean when a system is connected to ground or a conductive body that extends the ground connection?
• Which of the following is an example of personal protective equipment?
• What is the current-carrying capacity for No. 6 THWN aluminum conductors in conduit run through an ambient temperature of 38°C?
• What is the largest size grounding electrode conductor required for copper connected to a concrete-encased electrode?
• A cobra head luminaire is most commonly used in what application?
• Which of the following is NOT necessarily a result of Code provisions meant for safety?
• What is a conductor with failed insulation that contacts the metal edge of a grounded wireway referred to as?
• Which type of luminaire offers the best glare control?
• What is meant by a case, housing, or wall that prevents contact with energized parts?
• When tripped, the circuit breaker handle moves to which position?
• What is the primary goal of having mandatory requirements in electrical code?
• What is the load center length for a branch circuit with noncontinuous loads of 125A at 80' from the source, 75A at 110' from the source, and 50A at 100' from the source?
• What factor is considered when calculating lighting load for occupancies according to the NEC?
• Which color is used to identify grounded conductors larger than No. 6 AWG?
• The magnetic portion of a standard circuit breaker is used to provide what?
• What branch circuits in hotels and motels should be protected as described in section 210.12(A)(1) through (6)?
• What is the demand factor for three commercial ranges?
• Which installations are excluded from Code regulations under the exclusive control of an electrical utility?
• What is the demand load for one household range with a nameplate rating of 10kW, 240V, 1Ø?
• What is true regarding the voltage rating of a fuse?
• A feeder circuit with a continuous load of 16A and a noncontinuous load of 10A should use an overcurrent protective device sized at what?
• Which classification pertains to areas where gases and vapors are prevalent?
• What is the minimum length required for rod and pipe grounding electrodes?
• Locations in which flammable gases or vapors may be present are identified as what?
• What is the potential hazard in Class II locations?
• What is the definition of a "service drop" in electrical terms?
• What method is typically used to calculate the ampacity of a conductor?
• What is the typical purpose of overhead service conductors in residential areas?
• How many receptacles are included in the branch circuit for the ampacity calculation mentioned?
• Which type of electrode's size requirement can be waived if it does not connect to larger size conductors?
• A correction factor must be applied if the ambient temperature is above what degree Celsius?
• What is the correct method to determine lighting load calculations on a specific circuit?
• A 500A circuit breaker has a frame size of what?
• In regards to conductor sizes, what do the term 'THWN' indicate?
• Continuous loads are calculated at what percentage of the maximum current rating of the overcurrent device?
• What is the required minimum clearance from final grade for overhead service conductors over areas accessible only to pedestrians?
• Which current fault is characterized by an unintended connection with the ground?
• When a luminaire directs 60% to 90% of emitted light downward and 10% to 40% upward, this is known as what type of lighting?
• What does the demand factor of a system refer to?
• In a grounded system, how should normally noncurrent-carrying electrically conductive materials be connected?
• What voltage rating is used for calculating the demand load for residential ranges?
• Which of the following areas is not included in the clearance requirements for overhead service conductors?
• Ultrasonic occupancy sensors are triggered by what?
• What is the frame size of a 30A circuit breaker?
• What term describes electrical equipment rooms or enclosures that are controlled by locks and considered accessible to qualified persons?
• What is the required branch circuit ampacity of a water heater with a nameplate rating of 7,200VA at 240V?
• What is a branch circuit that supplies only one utilization equipment known as?
• What is prohibited from being used in the working space of electrical installations?
• Which of the following is approved for use in most Class I, Division 1 locations?
• In electrical equipment context, the term "reconditioned" can be interchangeable with which of the following terms?
• In the evaluation of equipment for approval, which considerations are necessary?
• Which of the following locations are considered hazardous due to the presence of combustible dust?
• A single-element fuse provides what type of trip for high levels of current?
• What type of luminaires require regular testing for proper operation?
• What is the minimum calculation for the total load of show windows per linear foot?
• What is the classification for the space immediately beneath a motor fuel dispensing unit at an automotive service station?
• What is the maximum allowable voltage drop for a 277V circuit to keep it within a 3% limit?
• How does the NEC define a continuous load?
• What is the primary purpose of an overload relay?
• In terms of electrical safety, which joint type is preferred for threaded metal conduits?
• How can an incandescent light be dimmed?
• Air conditioning overcurrent protective devices can never exceed what percentage of the motor-rated load current or branch circuit selection current?
• What is the minimum size of the grounding electrode conductor for a building supplied by a feeder?
• In terms of energy efficiency, which type of lighting is desirable for long-duration use while seated?
• In other than dwelling units, GFCI protection shall be provided for all 15A and 20A, 125V, single-phase receptacles installed within how many feet from the top inside edge of the bowl of a sink?
• How high above the floor are anesthetizing locations in hospitals classified?
• What is the basic measure of the amount of light produced by a light source called?
• What is the goal of applying correction factors in electrical installations?
• Which term describes a device that interrupts the flow of electricity in case of overloads?
• How many lighting outlets must be installed in attics, underfloor spaces, utility rooms, and basements used for storage?
• A multiwire branch circuit consists of which of the following?
• What typically causes nuisance tripping in electrical circuits?
• Which type of lighting enhances visibility in hazardous areas?
• Which lighting type is primarily concerned with reducing energy costs in unoccupied spaces?
• What is the required rating of the service disconnect for a building supplied by a feeder?
• What is the minimum clearance required for overhead service conductors not exceeding 600V over commercial areas subject to truck traffic?
• Which type of fixture is typically equipped with bottom shielding such as a louver or diffuser when mounted above eye level?
• Electrical hazards often arise when the initial wiring did not accommodate increases in what?
• What is the total load required by the NEC® for four appliance branch circuits plus a laundry branch circuit?
• For a branch circuit with a load of 50A operating at 100', what would be the recommended load center length to consider?
• A sign load CANNOT exceed what percentage of the branch circuit rating?
• Equipment intended to interrupt current at fault levels must have an interrupting rating at nominal circuit voltage that is at least what?
• What should the total ampacity consideration be for continuous loads on a circuit?
• Separately installed pressure connectors must be used with conductors at the ampacities not exceeding what?
• Each disconnecting means must be marked to indicate its purpose unless what condition is met?
• Where can correction factors for reductions due to high ambient temperatures be found?
• Where should the lighting load calculations for a nondwelling building comply with an energy code be referenced from?
• What does the term “working space” refer to in an electrical context?
• Which of the following is commonly referred to as motor branch circuit protection?
• The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed what percentage of a multiple outlet branch circuit rating?
• The Code covers the installation of what for public and private premises?
• What is the term for electrical circuits that are designed to supply only a single piece of equipment?
• In what type of construction or facility should the branch circuits supplying devices always be protected?
• Which of the following systems can provide zone control in large open spaces?
• What should be prevented from entering service raceways or equipment regarding service-entrance and overhead service conductors?
• Which of the following is a guiding document for electrical practice and safety in the U.S.?
• Regarding safety, what is a significant concern if wiring does not account for future electricity increases?
• How does a circuit breaker react to a short circuit?
• Composite optical fiber cables contain optical fibers and which additional component?
• What issue can arise from inadequate planning in initial wiring projects?
• What is the minimum size copper equipment bonding jumper for a 40A rated circuit?
• What lighting type is important for creating a safe egress in emergency situations?
• Which term refers to a living space that combines sleeping, sanitary, and storage facilities within a compartment?
• Which statement about circuit breakers is TRUE?
• If a continuous load on a branch circuit is measured at 12A, what should the overcurrent protection be sized at?
• What is the total ampacity for a 120V branch circuit consisting of four duplex receptacles rated noncontinuous duty and four duplex receptacles rated continuous duty?
• If a 20A branch circuit supplies multiple receptacles, what is the minimum ampere rating required for those receptacles?
• When assessing the feeder load requirements for small appliance circuits, which value is typically used?
• What is the purpose of the equipment bonding jumper?
• What lighting term refers to fixtures that primarily light an area directly above a visual task?
• What should be included in an effective ground-fault current path in a grounded system?
• What is one of the first signs of worn motor bearings?
• The physical properties of a No. 4/0 copper conductor would be found in which part of the NEC?
• What is the load for 30' of multi-outlet assembly supplying multiple loads?
• UL Class R fuses have a short circuit interrupting rating of up to what value?
• For resistance welders, what is the maximum rating for the overcurrent protection device?
• What type of dimming control is commonly used with Wi-Fi?
• What component connects the grounding terminal of a receptacle to a grounded box?
• What is the full-load current for a 30hp, 460V, 3-phase induction motor?
• Which class charges facilities where combustible dust may be present?
• A clothing manufacturing plant would MOST likely be classified as which class?
• How is the required branch circuit capacity determined for heavy-duty appliances?
• What is the required circuit ampacity for a noncontinuous, single-phase load of 8.5kW at 277V?
• Concrete-encased electrodes do not need to be part of the grounding electrode system in which type of buildings?
• In which situations is the 125 percent load calculation multiplier important?
• What is the best type of occupancy sensor for an office where occupants sit quietly for long periods?
• If a conductor has a diameter of 80 mils, what is its diameter in inches?
• What is the maximum allowable protection for electric resistance heating elements?
• What is the MINIMUM ampacity for the branch circuit conductors for a single-phase motor rated at 2hp, 230V?
• Metal water piping systems must be bonded to which of the following?
• Which of the following is NOT a typical function of an Energy Management System (EMS)?
• What is the load center length for a 208V, four-wire, three-phase circuit with specified loads at various distances?
• What is the term used for a sudden surge of electrical current?
• Overcurrent protection is outlined in which NEC article?
• What is MOST important when choosing a luminaire for general illumination in healthcare patient observation areas?
• What is the function of a dual-element, time-delay fuse?
• Which of the following is within the basic scope of Underwriters Laboratories?
• The conductors connected to the direct-current input of an inverter in photovoltaic systems form what?
• A luminaire with a 2x3 light distribution pattern is classified as what according to NEMA classifications?
• What is the minimum percentage of the illuminance level that corridor lighting should have compared to adjacent areas?
• Composite cables that contain both optical fibers and electrical conductors are useful for what primary purpose?
• Which of the following is TRUE regarding circuit breaker interrupting capacity ratings?
• For large equipment with a combined ampere rating of 1200 amperes or more, what is the minimum entrance width required for the working space?
• What is the primary purpose of the NEC?
• What is the demand load for four pieces of commercial cooking equipment according to the NEC®?
• Lighting that uses fixtures above the visual task area and enhances local area lighting is classified as what?
• Overhead service conductors require a minimum vertical clearance of how many feet over residential property where voltage does not exceed 300 volts-to-ground?
• In what situation would good color rendition be especially important when selecting lighting?
• What is the load for three 120V outlets for heavy-duty lamp holders?
• Why is it important for conductors connected to an inverter to be properly defined?
• Above what temperature is a temperature correction factor typically applied?
• Occupancy sensors are often used in conjunction with what device to manage lighting?
• What does the thermal portion of a standard circuit breaker protect against?
• Who is typically responsible for classifying an area as hazardous regarding lighting fixture installations?
• Where exposed to the weather, raceways enclosing service-entrance conductors must be approved or listed for use in what type of locations?
• What type of lighting provides the minimum light levels needed to assist people when exiting a building?
• According to NFPA 70E, what is an important aspect of selecting personal protective equipment?
• When evaluating large electrical equipment, what is a key factor related to safety?
• What is the term for the reduced operation of luminaires near windows when the sun is shining?
• What can be included as common ignition sources in hazardous locations?
• For 480V circuits, the arc current most commonly does not exceed what percentage of the available bolted fault current?
• Which factor must be considered when determining the size of the conductor required to connect an electrical load to the source of supply?
• What is the main purpose of seals or sealoffs in conduit runs?
• For circuits requiring safety, which organization is often relied upon for standards?
• What is the square mil area of a conductor that measures 0.250" on all sides?
• What is the recommended method for determining short circuit currents?
• What is the feeder load (in VA) for four small appliance branch circuits?
• Outside feeder tap conductors can be of unlimited length without overcurrent protection if what condition is met?
• What is the rating for overcurrent protection in circuits with noncontinuous loads?
• What ensures safety in electrical work according to NFPA 70E?
• A device that withstands numerous trip and reset cycles is known as a(n)?
• What is the voltage drop for a 120V, single-phase, two-wire branch circuit, 100' long with a 13A load?
• Who is responsible for deciding on the approval of equipment and materials used in electrical installations?
• What is the main purpose of the NEC?
• Which devices help prevent moisture from collecting in raceway systems?
• Which device is typically used to reduce the brightness of lights in a space?
• What is the minimum service disconnect rating for installations that supply only limited loads of a single branch circuit?
• The 125 percent multiplier for a continuous load is included when using unit loads for calculating lighting load for which section?
• What size overcurrent protective device should be selected for a 120V feeder with a continuous load at 20A and a noncontinuous load at 25A?
• When insulation breaks down and leaks current to ground, this condition is best known as:
• Circuit breakers are classified by what criterion?
• What circuit condition must be met for calculating load requirements on a branch circuit?
• What common sources of ignition include electricity and failed wiring splices?
• What is the primary benefit of using daylight harvesting in buildings?
• What is the MAXIMUM size dual-element fuse for a 40hp, 3Ø, 460V motor with a Design Letter D?
• When a separate building is supplied by a separately derived system, how must it be installed if overcurrent protection is not provided for the supply conductors?
• Which type of fault current is NOT included in the common categories?
• In the NEC, what word or words indicate a mandatory requirement?
• The type of fuse designed to prevent nuisance tripping due to temporary motor overloads is called a(n):
• In a three-phase, four-wire delta system, which color is reserved for identifying the high leg?
• Which type of lamp can be effectively used in a large flexible sheet?
• Which type of load is considered continuous in a circuit?
• Which mechanism is commonly used to ensure lighting is turned off when not in use?
• Type MC cable provides an effective ground-fault current path and is recognized by the NEC as an equipment grounding conductor when it contains what?
• What is the lighting load on a 120V circuit for six 100W incandescent lights and four fluorescent fixtures with a ballast rating of 1.5A, all operating continuously for 8 hours per day?
• What is the feeder load requirement for the minimum number of small appliance branch circuits in a kitchen?