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Questions and Answers
Which type of battery is increasingly being used in large-scale applications due to its high energy density?
Which type of battery is increasingly being used in large-scale applications due to its high energy density?
What gases are liberated by the vented type of lead-acid cell under normal charging conditions?
What gases are liberated by the vented type of lead-acid cell under normal charging conditions?
What is the principal active material in the positive plate of an alkali battery?
What is the principal active material in the positive plate of an alkali battery?
Which type of cell is commonly used in storage batteries?
Which type of cell is commonly used in storage batteries?
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What is the purpose of a thermal barrier in the installation of resistors or reactors?
What is the purpose of a thermal barrier in the installation of resistors or reactors?
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What is the minimum clearance required between resistors or reactors and combustible materials in installations over 1000 Volts?
What is the minimum clearance required between resistors or reactors and combustible materials in installations over 1000 Volts?
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What is the recommended practice for the installation of lead-acid batteries for stationary applications?
What is the recommended practice for the installation of lead-acid batteries for stationary applications?
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According to the NEC, what is the minimum conductor ampacity for a phase converter supplying specific fixed loads, where the conductor ampacity is less than 125 percent of the phase converter nameplate single-phase input full-load amperes?
According to the NEC, what is the minimum conductor ampacity for a phase converter supplying specific fixed loads, where the conductor ampacity is less than 125 percent of the phase converter nameplate single-phase input full-load amperes?
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What is the purpose of identifying the manufactured phase conductors in all accessible locations?
What is the purpose of identifying the manufactured phase conductors in all accessible locations?
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If the input and output voltages of a phase converter are different, how should the current be calculated?
If the input and output voltages of a phase converter are different, how should the current be calculated?
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According to the text, what is the rating requirement for the disconnecting means in each ungrounded conductor for each capacitor bank?
According to the text, what is the rating requirement for the disconnecting means in each ungrounded conductor for each capacitor bank?
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What is the purpose of connecting capacitors in an induction motor circuit for power factor correction?
What is the purpose of connecting capacitors in an induction motor circuit for power factor correction?
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According to the text, what should be taken into account when selecting the rating of a motor overload device if a capacitor is connected on the load side of the motor overload relays?
According to the text, what should be taken into account when selecting the rating of a motor overload device if a capacitor is connected on the load side of the motor overload relays?
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According to the text, what should be connected to the equipment grounding conductor for capacitor cases?
According to the text, what should be connected to the equipment grounding conductor for capacitor cases?
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Which of the following is an acceptable use of a phase converter?
Which of the following is an acceptable use of a phase converter?
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How should the phase conductor at a central distribution point be identified?
How should the phase conductor at a central distribution point be identified?
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What should be the ampere rating of the disconnecting means for a phase converter?
What should be the ampere rating of the disconnecting means for a phase converter?
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Where should the disconnecting means for a phase converter be located?
Where should the disconnecting means for a phase converter be located?
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Which of the following is true about capacitors in a motor load circuit?
Which of the following is true about capacitors in a motor load circuit?
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What is the requirement for enclosing capacitors containing more than 11 L (3 gal) of flammable liquid?
What is the requirement for enclosing capacitors containing more than 11 L (3 gal) of flammable liquid?
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How quickly should the residual voltage of a capacitor be reduced to 50 volts or less after it is disconnected from the source of supply?
How quickly should the residual voltage of a capacitor be reduced to 50 volts or less after it is disconnected from the source of supply?
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What is the ampacity requirement for capacitor circuit conductors?
What is the ampacity requirement for capacitor circuit conductors?
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According to the text, what is the purpose of the discharge circuit in a capacitor bank?
According to the text, what is the purpose of the discharge circuit in a capacitor bank?
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According to the text, what is the purpose of the interlocks in the switching sequence for series capacitors?
According to the text, what is the purpose of the interlocks in the switching sequence for series capacitors?
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According to the text, how should capacitor cases be connected in terms of grounding?
According to the text, how should capacitor cases be connected in terms of grounding?
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According to the text, what information should be provided on the permanent nameplate of each capacitor?
According to the text, what information should be provided on the permanent nameplate of each capacitor?
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According to the NEC, what is the maximum allowable voltage drop for conductors sized to prevent a voltage drop exceeding 3 percent of maximum anticipated load?
According to the NEC, what is the maximum allowable voltage drop for conductors sized to prevent a voltage drop exceeding 3 percent of maximum anticipated load?
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What is the minimum allowable voltage drop for conductors sized to prevent a voltage drop exceeding 3 percent of maximum anticipated load?
What is the minimum allowable voltage drop for conductors sized to prevent a voltage drop exceeding 3 percent of maximum anticipated load?
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According to IEEE 1375-2003, what does it provide guidance for?
According to IEEE 1375-2003, what does it provide guidance for?
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According to the text, what is the maximum voltage of a battery that does not require overcurrent protection for conductors supplying power for starting, ignition, or control of prime movers?
According to the text, what is the maximum voltage of a battery that does not require overcurrent protection for conductors supplying power for starting, ignition, or control of prime movers?
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According to the NEC, what type of sign should be installed on the disconnecting means enclosure or immediately adjacent to open disconnecting means where the possibility of backfeed exists?
According to the NEC, what type of sign should be installed on the disconnecting means enclosure or immediately adjacent to open disconnecting means where the possibility of backfeed exists?
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According to the text, where should the single-line diagram of the local switching arrangement be provided?
According to the text, where should the single-line diagram of the local switching arrangement be provided?
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According to the text, which part of the NEC covers assemblies of switchgear and industrial control equipment?
According to the text, which part of the NEC covers assemblies of switchgear and industrial control equipment?
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According to the text, what type of conduit is suggested by manufacturers to be used in order to withstand corrosive battery fumes?
According to the text, what type of conduit is suggested by manufacturers to be used in order to withstand corrosive battery fumes?
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What is the minimum clearance required between a cell container and any wall or structure for battery racks?
What is the minimum clearance required between a cell container and any wall or structure for battery racks?
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Which type of battery technology does not require ventilation under normal or abnormal charging conditions?
Which type of battery technology does not require ventilation under normal or abnormal charging conditions?
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What is the purpose of the ventilation requirement for battery locations?
What is the purpose of the ventilation requirement for battery locations?
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According to the text, what is the purpose of a flame arrester in a vented cell?
According to the text, what is the purpose of a flame arrester in a vented cell?
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What is the purpose of a pressure-release vent in a sealed cell?
What is the purpose of a pressure-release vent in a sealed cell?
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What is the purpose of a ground-fault detector and indicator in battery circuits exceeding 100 volts?
What is the purpose of a ground-fault detector and indicator in battery circuits exceeding 100 volts?
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According to the text, where should gas piping be located in relation to dedicated battery rooms?
According to the text, where should gas piping be located in relation to dedicated battery rooms?
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According to the text, what is the minimum air separation required between bare live conductors and adjacent grounded surfaces for a 14.4 kV system installed outdoors?
According to the text, what is the minimum air separation required between bare live conductors and adjacent grounded surfaces for a 14.4 kV system installed outdoors?
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What is the purpose of isolating switches in electrical equipment?
What is the purpose of isolating switches in electrical equipment?
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According to the text, what is the purpose of former Article 490 in the NEC?
According to the text, what is the purpose of former Article 490 in the NEC?
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What is the impact of the change in Article 490 in the NEC on the availability of disconnecting means for high voltage applications?
What is the impact of the change in Article 490 in the NEC on the availability of disconnecting means for high voltage applications?
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Which of the following is a requirement for disconnecting battery circuits exceeding 240 volts dc nominal for maintenance?
Which of the following is a requirement for disconnecting battery circuits exceeding 240 volts dc nominal for maintenance?
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What is the purpose of remote controls for the disconnecting means of a stationary standby battery?
What is the purpose of remote controls for the disconnecting means of a stationary standby battery?
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What is the purpose of the marking on the disconnecting means for a battery system?
What is the purpose of the marking on the disconnecting means for a battery system?
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Where should batteries be located and arranged in order to provide sufficient work space for inspection and maintenance?
Where should batteries be located and arranged in order to provide sufficient work space for inspection and maintenance?
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According to the text, what type of cells are sometimes used in stationary installations, but require special charging equipment to prevent gas emissions?
According to the text, what type of cells are sometimes used in stationary installations, but require special charging equipment to prevent gas emissions?
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According to the text, which type of batteries can generate hydrogen during fault conditions?
According to the text, which type of batteries can generate hydrogen during fault conditions?
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According to the text, what type of batteries does the requirement for listing apply to?
According to the text, what type of batteries does the requirement for listing apply to?
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Which type of battery generally requires special charging equipment to prevent gas emissions?
Which type of battery generally requires special charging equipment to prevent gas emissions?
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What type of batteries does the requirement for listing in Article 480 not apply to?
What type of batteries does the requirement for listing in Article 480 not apply to?
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Which type of battery is commonly used in storage batteries?
Which type of battery is commonly used in storage batteries?
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Which of the following is a requirement for disconnecting battery circuits exceeding 240 volts dc nominal for maintenance?
Which of the following is a requirement for disconnecting battery circuits exceeding 240 volts dc nominal for maintenance?
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What is the purpose of the ventilation requirement for battery locations?
What is the purpose of the ventilation requirement for battery locations?
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According to the text, what is the maximum voltage of a battery that does not require overcurrent protection for conductors supplying power for starting, ignition, or control of prime movers?
According to the text, what is the maximum voltage of a battery that does not require overcurrent protection for conductors supplying power for starting, ignition, or control of prime movers?
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Which NFPA standard provides guidance for the classification of flammable liquids, gases, or vapors and of hazardous (classified) locations for electrical installations in chemical process areas?
Which NFPA standard provides guidance for the classification of flammable liquids, gases, or vapors and of hazardous (classified) locations for electrical installations in chemical process areas?
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Which NFPA standard provides guidance for the classification of locations for drycleaning facilities?
Which NFPA standard provides guidance for the classification of locations for drycleaning facilities?
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Which NFPA standard provides guidance for the classification of locations for spray application using flammable or combustible materials?
Which NFPA standard provides guidance for the classification of locations for spray application using flammable or combustible materials?
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Which of the following is a requirement for doors that provide access to high-voltage energized parts in switchgear or control assemblies?
Which of the following is a requirement for doors that provide access to high-voltage energized parts in switchgear or control assemblies?
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What is the purpose of installing permanent signs on panels or doors that provide access to live parts over 1000 volts?
What is the purpose of installing permanent signs on panels or doors that provide access to live parts over 1000 volts?
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Where should control equipment, relays, motors, and the like be installed in relation to high-voltage parts or high-voltage wiring?
Where should control equipment, relays, motors, and the like be installed in relation to high-voltage parts or high-voltage wiring?
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What is the purpose of interlocks for interrupter switches equipped with stored energy mechanisms?
What is the purpose of interlocks for interrupter switches equipped with stored energy mechanisms?
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According to the text, what is the purpose of the ground bus in switchgear used as service equipment?
According to the text, what is the purpose of the ground bus in switchgear used as service equipment?
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According to the text, what is the purpose of the mechanical interlocks in circuit breakers equipped with stored energy mechanisms?
According to the text, what is the purpose of the mechanical interlocks in circuit breakers equipped with stored energy mechanisms?
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According to the text, what is the requirement for locking circuit breakers in the open position?
According to the text, what is the requirement for locking circuit breakers in the open position?
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According to the text, what is the purpose of the single-line diagram of the switchgear?
According to the text, what is the purpose of the single-line diagram of the switchgear?
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According to the text, which hazardous locations are covered by NFPA 495, Explosive Materials Code?
According to the text, which hazardous locations are covered by NFPA 495, Explosive Materials Code?
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According to the text, which hazardous locations are not covered by NFPA 495, Explosive Materials Code?
According to the text, which hazardous locations are not covered by NFPA 495, Explosive Materials Code?
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According to the text, what type of equipment is not covered by NFPA 495, Explosive Materials Code?
According to the text, what type of equipment is not covered by NFPA 495, Explosive Materials Code?
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According to the text, what is the purpose of area classification drawings and associated documentation?
According to the text, what is the purpose of area classification drawings and associated documentation?
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Which type of locations are covered in Articles 500 through 516 of the NEC?
Which type of locations are covered in Articles 500 through 516 of the NEC?
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What is the flash point temperature for a flammable liquid according to the text?
What is the flash point temperature for a flammable liquid according to the text?
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What is the purpose of the bonding requirement for non-current-carrying metal parts of a boiler according to the text?
What is the purpose of the bonding requirement for non-current-carrying metal parts of a boiler according to the text?
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What is the purpose of the pressure and temperature limit control in a boiler according to the text?
What is the purpose of the pressure and temperature limit control in a boiler according to the text?
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According to the text, what is the requirement for enclosing energized switching and control parts in mobile and portable equipment?
According to the text, what is the requirement for enclosing energized switching and control parts in mobile and portable equipment?
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According to the text, what is the purpose of disconnecting means for mobile and portable high-voltage equipment?
According to the text, what is the purpose of disconnecting means for mobile and portable high-voltage equipment?
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According to the text, what is the requirement for collector ring assemblies on revolving-type machines?
According to the text, what is the requirement for collector ring assemblies on revolving-type machines?
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According to the text, what is the requirement for power cable connections to mobile machines?
According to the text, what is the requirement for power cable connections to mobile machines?
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Which standard provides guidance for the classification of hazardous (classified) locations for electrical installations in chemical process areas?
Which standard provides guidance for the classification of hazardous (classified) locations for electrical installations in chemical process areas?
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Which standard provides information on protection against static electricity and lightning hazards in hazardous (classified) locations?
Which standard provides information on protection against static electricity and lightning hazards in hazardous (classified) locations?
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Which standard provides information on electrical systems for hazardous (classified) locations on offshore oil- and gas-producing platforms, drilling rigs, and workover rigs?
Which standard provides information on electrical systems for hazardous (classified) locations on offshore oil- and gas-producing platforms, drilling rigs, and workover rigs?
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Which NFPA standard provides guidance for the classification of locations for spray application using flammable or combustible materials?
Which NFPA standard provides guidance for the classification of locations for spray application using flammable or combustible materials?
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Where should the single-line diagram of the local switching arrangement be provided?
Where should the single-line diagram of the local switching arrangement be provided?
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What is the purpose of the interlocks in the switching sequence for series capacitors?
What is the purpose of the interlocks in the switching sequence for series capacitors?
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What is the principal active material in the positive plate of an alkali battery?
What is the principal active material in the positive plate of an alkali battery?
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What is the purpose of the area classification drawings and associated documentation?
What is the purpose of the area classification drawings and associated documentation?
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Which standards provide information on electrical resistance trace heating for hazardous locations?
Which standards provide information on electrical resistance trace heating for hazardous locations?
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What type of documentation consists of area classification drawings?
What type of documentation consists of area classification drawings?
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Which NFPA standard provides guidance for the classification of flammable liquids, gases, or vapors and of hazardous (classified) locations for electrical installations in chemical process areas?
Which NFPA standard provides guidance for the classification of flammable liquids, gases, or vapors and of hazardous (classified) locations for electrical installations in chemical process areas?
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Which organizations can be used to classify locations according to NFPA standards?
Which organizations can be used to classify locations according to NFPA standards?
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What factors must be considered when classifying an area?
What factors must be considered when classifying an area?
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What happens if different types of flammable materials exist in a process or location?
What happens if different types of flammable materials exist in a process or location?
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Is equipment suitable for use in a Class I location also suitable for use in a Class II location?
Is equipment suitable for use in a Class I location also suitable for use in a Class II location?
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Which of the following factors is NOT considered in determining the classification and extent of a location?
Which of the following factors is NOT considered in determining the classification and extent of a location?
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Which of the following is a factor in determining the need for a Class II classified location?
Which of the following is a factor in determining the need for a Class II classified location?
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Which of the following statements about Class II, Division 1 locations is correct?
Which of the following statements about Class II, Division 1 locations is correct?
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Which of the following statements about Group E dusts is correct?
Which of the following statements about Group E dusts is correct?
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Which group of chemicals in NFPA 497 is characterized by having a maximum experimental safe gap (MESG) value less than or equal to 0.45 mm or a minimum igniting current ratio (MIC ratio) less than or equal to 0.40?
Which group of chemicals in NFPA 497 is characterized by having a maximum experimental safe gap (MESG) value less than or equal to 0.45 mm or a minimum igniting current ratio (MIC ratio) less than or equal to 0.40?
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Which chemical is mentioned as a typical Class I, Group B material in the text?
Which chemical is mentioned as a typical Class I, Group B material in the text?
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Which NFPA standard provides guidance for the classification of combustible dusts and hazardous (classified) locations for electrical installations in chemical process areas?
Which NFPA standard provides guidance for the classification of combustible dusts and hazardous (classified) locations for electrical installations in chemical process areas?
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Which of the following locations is typically classified as a Class I, Division 1 location?
Which of the following locations is typically classified as a Class I, Division 1 location?
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Which of the following is a requirement for Class I, Division 2 locations?
Which of the following is a requirement for Class I, Division 2 locations?
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Which of the following is a requirement for the installation of instrumentation or other electrical equipment in Class I, Division 1 locations?
Which of the following is a requirement for the installation of instrumentation or other electrical equipment in Class I, Division 1 locations?
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Which of the following locations might become hazardous through failure or abnormal operation of the ventilating equipment?
Which of the following locations might become hazardous through failure or abnormal operation of the ventilating equipment?
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Which locations shall be classified as Class III, Division 1?
Which locations shall be classified as Class III, Division 1?
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Which materials can be classified as ignitible fibers/flyings?
Which materials can be classified as ignitible fibers/flyings?
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Which locations shall be classified as Class II, Division 1, Group E?
Which locations shall be classified as Class II, Division 1, Group E?
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Which locations shall be classified as Class III, Division 2?
Which locations shall be classified as Class III, Division 2?
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