Limited Licensed Electrician (LLE) Practice Test

These questions are part of the practice quiz. Start practicing

• What is the purpose of grounding in electrical systems?
• For an appliance rated at 6,000 watts on a 240 volt circuit, what is the total current draw in amps?
• What is the minimum calculated service load for 10-10.8 KW electric ranges installed in dwelling units?
• How should you handle electrical equipment near water?
• What does NEC stand for in electrical specifications?
• What is the minimum size copper supply-side bonding jumper for a metal conduit containing 250 KCMIL aluminum service entrance conductors?
• What color is usually used to identify a live (hot) wire in standard wiring systems?
• Why is it important for electricians to follow local codes and standards?
• What does the term “frequency” refer to in electrical terms?
• What type of area should be avoided for the installation of service equipment?
• What is the basic principle behind Ohm's Law?
• What is the minimum calculated branch circuit lighting load for a 60,000 square foot storage warehouse?
• What is the primary hazard associated with overloaded circuits?
• What is the minimum height for overhead service conductors above ground level?
• At what intervals must flexible metal conduit be secured?
• What is the function of a Junction Box?
• Describe the purpose of a Ground Fault Circuit Interrupter (GFCI).
• Which system must include a nurse call system as part of its critical branch?
• What is the allowable ampacity of each conductor when 8 current-carrying 8 AWG, THW copper conductors are installed in a raceway at an ambient temperature of 45 degrees Celsius?
• What type of transformer delivers power at a lower voltage but higher current?
• What minimum size THW copper branch circuit conductors are required to supply a 230 volt, 5 hp motor?
• A load with a resistance of 16 ohms placed on a 240 volt circuit will have a current draw of __________ amps.
• Which type of wiring method is generally used in residential installations?
• What is the minimum size of XHHW aluminum conductors for a 100 amp service entrance supplying a dwelling unit?
• What kind of space should service equipment be installed in?
• What is the minimum height a service drop must be above residential property?
• What is the primary advantage of using LED lighting over traditional lighting?
• Why is it important to prevent unbalanced loads in a three-phase system?
• How is the effectiveness of an electrical ground measured?
• What is the primary purpose of the National Electrical Code (NEC)?
• What is the current draw in amps for a 2,500 watt load on a 208 volt, 3-phase circuit?
• What is the allowable ampacity of each 350 KCMIL XHHW aluminum conductor in an underground raceway at 105 degrees Fahrenheit?
• What advantage do hard-wired smoke detectors have over battery-operated ones?
• The purpose of a circuit breaker is to __________.
• What does the term “load center” refer to in electrical installations?
• What does it mean to "bond" electrical components?
• What must be done to electrical equipment before cleaning it?
• Why is a surge protector important in electrical systems?
• In a three-phase system, what does the 'kVA' rating indicate?
• What is an essential characteristic of a hard-wired smoke detector?
• What is the maximum permissible voltage drop in a residential circuit?
• Why is it important to adhere to local electrical codes?
• What is the minimum size EMT required for 12-1/0 AWG, THHN conductors over a length of 50 ft.?
• What is the minimum calculated branch circuit lighting load for a 12,000 square foot assembly hall?
• How are circuits typically classified in residential installations?
• How many 4 AWG, THW conductors can fit into an 18 in. section of 1 in. rigid metal conduit?
• In electrical terms, what does 'VA' stand for?
• How many amps are supplied by using a 10 AWG wire at its maximum capacity?
• What is the minimum calculated service load for 10-6kw electric clothes dryers installed in apartment units?
• When calculating the secondary current of a transformer, what happens to the current as the voltage increases?
• Which of the following statements is true about battery-operated smoke detectors?
• What are service entrance cables designed to do?
• What should be the minimum size for conductors feeding a 20-amp circuit?
• What is the common voltage rating for residential power in the United States?
• What is the minimum requirement for service grounding electrode size?
• What is the approximate current in the primary of a 100 kVA, 480:208/120 volt, 3-phase wye transformer?
• In wiring diagrams, what does a "circle with a dot" typically signify?
• Where must a main electrical service panel be located in a dwelling?
• What voltage is required to supply a 20 amp load on a circuit with a resistance of 6 ohms?
• What is the main difference between alternating current (AC) and direct current (DC)?
• What is the primary function of a circuit breaker?
• What is the minimum calculated branch circuit load for 1-8 kW electric cooktop and 2-4 kW electric wall-mounted ovens installed in a dwelling unit?
• What is the full-load current of a 460 volt, 20 hp motor?
• What is an advantage of using a circuit breaker over a fuse?
• What is the approximate total resistance of two 500 kcmil uncoated copper conductors wired in parallel for 1,000 feet?
• An AC circuit with a resistance of 10 ohms and a current of 10 amps would have what total wattage?
• What safety feature is built into newer electrical panels?
• What would be the total wattage for a 480 volt, 3-phase circuit with a load of 30 amps?
• What is required before performing work on electrical circuits?
• What is required for cable trays to accommodate changes in direction?
• What aspect of safety does an interconnected hard-wired smoke detector system provide?
• Name the device used to measure the electrical resistance of a circuit.
• What is a primary hazard when circuits are overloaded?
• What must raceways on exterior surfaces of buildings be arranged to do?
• What is the minimum calculated branch circuit lighting load for a 5,400 square foot restaurant?
• Which wiring method is commonly used for residential branch circuits?
• What safety equipment should be worn during electrical work?
• For what purpose are circuit diagrams primarily used?
• What is the primary purpose of a circuit breaker panel?
• What is the minimum calculated service load for 1-8 KW electric range installed in a dwelling unit?
• What is the minimum number of 120 volt, 15 amp branch circuits required for the lighting of a 4,200 square foot dwelling unit?
• What is the maximum rating allowed for the overcurrent protective device for a circuit using 10 AWG XHHW aluminum conductors supplying an electric water heater?
• What is the minimum calculated branch circuit lighting load for a 4,200 square foot dwelling unit?
• What is the primary purpose of the National Electrical Code (NEC)?
• In electrical installations, why is grounding important?
• Which of the following is NOT a responsibility of an electrical inspector?
• What is the minimum distance that combustible materials must be from electric panelboards?
• What type of wire is commonly used for residential outdoor lighting?
• For a load of 2,500 watts on a 208 volt, 3-phase circuit, what is the calculated current in amps?
• What is the primary purpose of a main disconnect switch in an electrical system?
• What is the full-load current of a 230 volt, 5 hp motor?
• What must be done before working on live electrical circuits?
• What is the minimum calculated service load for 20-12 KW electric ranges installed in dwelling units?
• What is the allowable ampacity of each conductor where 4 current-carrying 10 AWG, THW copper conductors are installed in a raceway at an ambient temperature of 70 degrees Fahrenheit?
• What is the appropriate grounding method for a home?
• What change in length occurs in rigid PVC conduit for every 100 feet with a temperature change of 10 degrees Fahrenheit?
• What is the function of a circuit breaker?
• What is the required minimum number of outlets for a dwelling unit?
• What must be installed to comply with code when a circuit supplies both receptacles and lighting?
• What is the approximate total current for a 3@, 208 volt feeder supplying multiple motors?
• What is the function of an AFCI breaker?
• What is the calculated current for a 10 AWG wire at 70% capacity?
• What is the maximum voltage for a Limited Licensed Electrician to work on?
• What is the maximum appliance rating that allows the use of a branch circuit breaker as the disconnecting means?
• What does the term "voltage drop" refer to in an electrical circuit?
• What is the allowable ampacity of each conductor when 4 current-carrying 10 AWG, THW copper conductors are installed in a raceway?
• What is the minimum calculated service load for 12-4,500 watt electric clothes dryers installed in apartment units?
• What is the minimum required depth for underground feeder (UF) cable buried in direct earth?
• What is the purpose of the bonding conductor in electrical installations?
• Which type of conduit is commonly used for underground applications?
• What is the primary purpose of calculating voltage drop in electrical circuits?
• What is the minimum calculated service load for 1-9 KW electric range installed in a dwelling unit?
• What is the primary risk associated with using extension cords improperly?
• What is the allowable ampacity of a 1-10 AWG, THW copper conductor?
• Which type of conduit is commonly used for underground installations?
• How many 12 AWG THHN conductors are permitted in a 4 in. x 1.5 in. square box?
• What is the maximum fill of a 20-inch conduit nipple placed between two panel boards?
• What is the approximate current in the secondary of a 480:240 volt transformer when the primary current is 100 amps?
• What is the maximum setting for the separate overload protection of a 3-phase, 15 hp, 460 volt motor with a nameplate rating of 19 amps?
• If a 20 amp load is connected to a 120 volt circuit, how much power is consumed in watts?
• What type of electrical system is used in most residential installations?
• How many 8 AWG, THHN conductors are permitted in a 20 ft. run of 1 in. EMT?
• The voltage drop in a circuit mainly affects which aspect of electrical performance?
• What material is commonly used for high-voltage transmission lines?
• What should be done if an electrical device emits a burning smell?
• What does the acronym "NEC" stand for?
• What three components are necessary for a complete electrical circuit?
• Which tool is essential for testing electrical circuits?
• What is the ideal maximum resistance of an electrical ground for effective performance?
• When are circuit breakers typically used in electrical systems?
• What does the term "short circuit" refer to?
• What is the term for total opposition to the flow of current in an AC circuit?
• What is a potential cause of electrical fires?
• What is an important consideration when calculating load for a circuit?
• Name a common cause of electrical fires.
• What is the allowable ampacity for each 10 AWG copper THHN conductor in a conduit with 2 sets of circuits supplying fluorescent lighting?
• What allowable percentage is used for calculating the ampacity for a residential service developer?
• What is a primary responsibility of a licensed electrician in the installation process?
• Which device is used to convert AC to DC?
• What is the volume of a device box measuring 3 in. x 2 in. x 2.5 in.?
• In electrical wiring, what does “ampacity” refer to?
• For safety, how often should electrical installations be inspected?
• What does the term "ampacity" refer to?
• What could be the consequence of exceeding the maximum resistance limit for an electrical ground?
• What is a key characteristic of a well-ventilated space for electrical service equipment?
• What is the total resistance of a 120 volt circuit supplying a 1200 watt load?
• What is the primary function of a transformer in an electrical system?
• What does GFCI stand for, and what is its function?
• How shall expansion fittings and telescoping sections of metal raceways be made electrically continuous?
• In residential wiring, what is the purpose of GFCI outlets?
• Why is compliance with safety regulations essential for electricians?
• What does the term "load calculation" refer to in electrical design?
• What is the maximum setting for the dual-element fuse used for branch-circuit protection of a 1-phase, 7.5 hp, 230 volt motor?
• Which type of electrical fault can GFCIs protect against?
• What is the minimum calculated service load for 6-1500 watt electric clothes washers and 3-4500 watt electric clothes dryers installed in a motel laundromat?
• In a 240 volt circuit, what current draw would provide 6,000 watts?
• In residential wiring, what is the typical color coding for a ground wire?
• What is the function of a transformer in electrical systems?
• In what manner should an electrical ground be characterized to ensure effectiveness?
• What is the role of an electrical inspector?
• What does the term "interconnected" mean in the context of smoke detectors?
• Why is it important to identify and label circuits in an electrical panel?
• What is a common application for three-way switches?
• What does a multimeter measure?
• What is the voltage range classified as low voltage in electrical installations?
• What is the minimum size of copper conductors needed for surge arresters on systems over 1000 Volts?
• What is the relationship between resistance and the number of conductors in parallel?
• What is the minimum size copper grounding electrode conductor required to connect to a metal water piping system supplied by 500 KCMIL copper service entrance conductors?
• For what reason is equal load distribution critical in a three-phase system?
• Which of the following is a key benefit of using a hard-wired smoke detector in a residential setup?
• What type of device detects the presence of moisture and can prevent electric shock?
• What is an overcurrent protection device?
• Why is it important to have a properly grounded electrical system?
• What is the recommended action if a circuit breaker frequently trips?
• In terms of wiring, what is the correct definition of amperage?
• What type of smoke detector is typically recommended for permanent installation?
• What is the significance of an “uninterruptible power supply” (UPS) in electrical systems?
• When evaluating the load for a 480 volt circuit, what phase is typically measured?
• What is the approximate resistance of a 500 kcmil uncoated copper conductor per 1000 feet?
• Which detection unit is commonly used to increase safety in homes for fire hazards?
• When is it necessary to use a conduit?
• What is the purpose of using a circuit breaker instead of a fuse?
• Which type of lighting requires a ballast to operate?
• What is the minimum distance that receptacles should be placed from water sources?
• In what scenario is an electrical permit required?
• When may Class 1 circuit conductors and supply conductors occupy the same raceway?
• What is the implication of NEC's "first rule"?
• Describe the term "current leakage."
• What is the approximate current in the secondary of a 100 kVA, 480:208/120 volt, 3-phase wye transformer?
• How do you identify a neutral wire in a typical residential circuit?
• What type of wire is appropriate for both indoor and outdoor use?
• What environmental condition is essential for the installation of service equipment?
• What is the approximate voltage drop in a 350 ft. long circuit with a current of 38 amps using 6 AWG copper conductors?
• The voltage drop in a circuit is generally expected to be what percentage of the total voltage?
• What volume is required for an outlet box containing 3-12/2 NM cables and a duplex receptacle outlet?
• What should be done first if a circuit breaker trips repeatedly?
• What is the purpose of a junction box in electrical systems?
• A nurse call system is part of which type of electrical system in a healthcare facility?
• Which component is essential for protecting circuits from overloads?
• What is the defining characteristic of a "protected" circuit?
• A transformer for outline lighting requires a switch with a rating of at least how many times the current rating of the transformer?
• What should you do if you find an exposed electrical conductor?
• What color insulation is used for grounding wires in residential wiring?
• How does a balanced load affect a three-phase system?
• What is the minimum calculated service load for a 1-18 kW electric range installed in a dwelling unit?
• What does "NEC Table 310.16" provide?
• What is the minimum calculated service load for 10-14.7 kW electric ranges installed in dwelling units?
• Which of the following is NOT a reason for a licensed electrician to perform work?
• What is the purpose of an electrical panel?
• What does the term "short circuit" refer to in electrical systems?
• What is one key factor that determines the voltage drop in an electrical circuit?
• What is the function of a dimmer switch?
• What is the purpose of a service disconnect?
• What is the standard wire size for residential lighting circuits?
• Name a common safety device that protects against overload in electrical circuits.
• A lighting fixture installed under a covered porch protected from rainfall must be listed for use in which type of location?
• What does NEC Article 250 primarily deal with?
• What is the minimum calculated service load for 20-6 kW electric ranges installed in dwelling units?
• What is the minimum calculated service load for 50-6KW electric clothes dryers installed in apartment units?
• How many 1 AWG, XHHW compact aluminum conductors are permitted in a 2 in. rigid metal conduit that is 42 ft long?
• What is the purpose of a load calculation in electrical systems?
• What is the minimum calculated service load for 19-4,800 watt electric clothes dryers supplied by a 3-phase service?
• What is the total load in amps for a circuit with diverse load requirements?
• Which measurement indicates a requirement for corrective action in grounding?
• What is the allowable ampacity of a 1-6 AWG, THHW copper conductor installed in a wet location?
• What is the minimum size of a copper grounding electrode conductor for a television antenna?
• Which outlet type is designed for outdoor usage and is weather-resistant?
• How does the cross-sectional area of a conductor affect its resistance?
• How many 12 AWG, THHN conductors are allowed in a 4 in. x 1.5 in. square box with internal cable clamps?
• What is the minimum calculated service load for 20-8 KW electric ranges installed in dwelling units?
• What minimum size THW copper conductors are required for a feeder supplying motors of 1-5hp, 1-10hp, and 1-20hp at 208 volts?
• What unit is used to measure electrical resistance?
• Why should wires be color-coded?
• What is the approximate voltage drop in a 125 ft. long circuit connected to a 3-phase, 208 volt, 5 hp motor supplied with 10 AWG copper conductors?
• What does the term "voltage drop" refer to in electrical systems?
• What is the minimum calculated service load for 1-12 KW electric range installed in a dwelling unit?
• What is the correct procedure for replacing a circuit breaker?
• When discussing voltage in electrical circuits, what does a drop indicate?
• What is the minimum calculated service load for an 8 kW electric cooktop and 2-4 kW electric wall-mounted ovens installed in a dwelling unit if supplied by the same branch circuit?
• What is the minimum number of 120 volt, 20 amp branch circuits required for the lighting of a 6,000 square foot restaurant?
• In a three-phase system, how are loads typically distributed?
• What is the standard voltage for most residential circuits?
• What is a consequence of excessive voltage drop in a circuit?
• What is required to install a new electrical service to a property?
• The power factor of an AC circuit typically exists between which values?
• What type of grounding system is typically required for a residential dwelling?
• Which document governs the licensing requirements for Limited Licensed Electricians (LLE)?
• Which of the following is a requirement for electrical installations according to the NEC?