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Questions and Answers
Which marking color is required for the conductor or busbar with the higher phase voltage to ground on a 4-wire, delta-connected system?
Which marking color is required for the conductor or busbar with the higher phase voltage to ground on a 4-wire, delta-connected system?
- Blue
- Red
- Orange (correct)
- Yellow
What is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
What is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
- To prevent problems caused by lack of standardization (correct)
- To identify the grounded conductor
- To indicate the phase with the highest voltage
- To indicate the phase with the lowest voltage
What should electricians do to determine the location of the high leg within a system?
What should electricians do to determine the location of the high leg within a system?
- Consult UL 468A-486B tables
- Refer to the manufacturer's instructions
- Use suitable equipment to measure the voltage of each phase relative to ground (correct)
- Inspect the conductor stranding
According to NFPA 70E, which of the following electrical equipment in other than dwelling units is required to be field or factory marked to warn qualified persons of potential electric arc flash hazards?
According to NFPA 70E, which of the following electrical equipment in other than dwelling units is required to be field or factory marked to warn qualified persons of potential electric arc flash hazards?
What is the purpose of proper warning labels on electrical equipment?
What is the purpose of proper warning labels on electrical equipment?
In which situations does the requirement to turn off the power before working on electrical circuits apply?
In which situations does the requirement to turn off the power before working on electrical circuits apply?
What information should a permanent arc flash label on service equipment and feeder supplied equipment rated 1000 amperes or more include?
What information should a permanent arc flash label on service equipment and feeder supplied equipment rated 1000 amperes or more include?
According to NFPA 70E, when should an arc-flash risk assessment be conducted?
According to NFPA 70E, when should an arc-flash risk assessment be conducted?
What is the purpose of marking the available fault current at service equipment?
What is the purpose of marking the available fault current at service equipment?
What should be done with unused current transformers associated with potentially energized circuits?
What should be done with unused current transformers associated with potentially energized circuits?
What can happen if the interrupting rating or short-circuit current rating of equipment is less than the available fault current?
What can happen if the interrupting rating or short-circuit current rating of equipment is less than the available fault current?
According to the text, what is the minimum horizontal working space required when rear access is needed to work on nonelectrical parts on the back of enclosed equipment?
According to the text, what is the minimum horizontal working space required when rear access is needed to work on nonelectrical parts on the back of enclosed equipment?
According to the text, when are smaller working spaces permitted for low voltage electrical equipment?
According to the text, when are smaller working spaces permitted for low voltage electrical equipment?
According to the text, when can Condition 2 working clearance be permitted between dead-front switchboards, switchgear, enclosed panelboards, or motor control centers located across the aisle from each other in existing buildings?
According to the text, when can Condition 2 working clearance be permitted between dead-front switchboards, switchgear, enclosed panelboards, or motor control centers located across the aisle from each other in existing buildings?
Which one of the following is true about locking provisions for a cord-and-plug connection?
Which one of the following is true about locking provisions for a cord-and-plug connection?
What is the purpose of working space around electrical equipment?
What is the purpose of working space around electrical equipment?
Which of the following is true about servicing and electrical preventive maintenance?
Which of the following is true about servicing and electrical preventive maintenance?
What is the minimum depth of working space required for equipment operating at 0-150 volts?
What is the minimum depth of working space required for equipment operating at 0-150 volts?
What is one way to determine the suitability of replacement parts for equipment that is not listed or field labeled?
What is one way to determine the suitability of replacement parts for equipment that is not listed or field labeled?
Which condition requires a minimum clear distance of 1.2 m (4 ft) for working space?
Which condition requires a minimum clear distance of 1.2 m (4 ft) for working space?
Which of the following types of electrical equipment can produce sparks during ordinary operation?
Which of the following types of electrical equipment can produce sparks during ordinary operation?
Under what circumstances are circuits for lighting and power allowed to be connected to a system that contains trolley wires with a ground return?
Under what circumstances are circuits for lighting and power allowed to be connected to a system that contains trolley wires with a ground return?
According to the text, what information should be marked on reconditioned equipment?
According to the text, what information should be marked on reconditioned equipment?
According to the text, what should be done to the original listing mark on reconditioned equipment?
According to the text, what should be done to the original listing mark on reconditioned equipment?
According to the text, in which case are the markings indicated in 110.21(A)(2) not required for reconditioned equipment?
According to the text, in which case are the markings indicated in 110.21(A)(2) not required for reconditioned equipment?
According to the text, what are the requirements for field-applied hazard markings?
According to the text, what are the requirements for field-applied hazard markings?
Which enclosure type provides protection against rain, snow, and sleet for outdoor use?
Which enclosure type provides protection against rain, snow, and sleet for outdoor use?
Which enclosure type provides protection against falling liquids and light splashing for indoor use?
Which enclosure type provides protection against falling liquids and light splashing for indoor use?
Which enclosure type provides protection against prolonged submersion for both outdoor and indoor use?
Which enclosure type provides protection against prolonged submersion for both outdoor and indoor use?
According to Table 110.26(A)(1), what is the minimum horizontal working clearance required for equipment operating at 151 to 1000 volts-to-ground?
According to Table 110.26(A)(1), what is the minimum horizontal working clearance required for equipment operating at 151 to 1000 volts-to-ground?
What is the voltage to ground for a 480-volt ungrounded delta system?
What is the voltage to ground for a 480-volt ungrounded delta system?
What is the reduced working space required for equipment that requires rear access for nonelectrical maintenance, such as replacing a filter?
What is the reduced working space required for equipment that requires rear access for nonelectrical maintenance, such as replacing a filter?
According to the text, what is the minimum clear distance specified in Table 110.26(A)(1) for equipment operating at that voltage and in that condition?
According to the text, what is the minimum clear distance specified in Table 110.26(A)(1) for equipment operating at that voltage and in that condition?
According to the text, what is the required width of the entrance to the working space for large equipment that contains overcurrent devices, switching devices, or control devices?
According to the text, what is the required width of the entrance to the working space for large equipment that contains overcurrent devices, switching devices, or control devices?
According to the text, what is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
According to the text, what is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
According to the text, what is the purpose of proper warning labels on electrical equipment?
According to the text, what is the purpose of proper warning labels on electrical equipment?
According to the text, what is the minimum width of the working space in front of electrical equipment?
According to the text, what is the minimum width of the working space in front of electrical equipment?
What is the minimum height of the working space for electrical equipment?
What is the minimum height of the working space for electrical equipment?
What is the maximum depth of the working space required to allow a door or hinged panel to open at least 90 degrees?
What is the maximum depth of the working space required to allow a door or hinged panel to open at least 90 degrees?
What is the minimum clear distance required for working space in Condition 2?
What is the minimum clear distance required for working space in Condition 2?
According to the text, what is the minimum elevation above the floor or other working surface for live parts of electrical equipment operating at 601 volts to 1000 volts between ungrounded conductors?
According to the text, what is the minimum elevation above the floor or other working surface for live parts of electrical equipment operating at 601 volts to 1000 volts between ungrounded conductors?
Which one of the following is true about the guarding of live parts by elevation?
Which one of the following is true about the guarding of live parts by elevation?
In locations where electrical equipment is likely to be exposed to physical damage, what should be done to prevent such damage?
In locations where electrical equipment is likely to be exposed to physical damage, what should be done to prevent such damage?
According to the text, what should be marked on enclosures of switchboards, switchgear, enclosed panelboards, and other electrical equipment rated not over 1000 volts nominal?
According to the text, what should be marked on enclosures of switchboards, switchgear, enclosed panelboards, and other electrical equipment rated not over 1000 volts nominal?
Which of the following is true about the dedicated electrical space for electrical equipment installation?
Which of the following is true about the dedicated electrical space for electrical equipment installation?
Which of the following is true about sprinkler protection in the dedicated electrical space?
Which of the following is true about sprinkler protection in the dedicated electrical space?
What is the definition of a structural ceiling in the context of electrical equipment installation?
What is the definition of a structural ceiling in the context of electrical equipment installation?
What is the requirement for foreign systems installed directly above the dedicated space for electrical equipment?
What is the requirement for foreign systems installed directly above the dedicated space for electrical equipment?
Which of the following is considered large equipment?
Which of the following is considered large equipment?
Which of the following is required for personnel doors that are less than 7.6 m (25 ft) from the nearest edge of the working space?
Which of the following is required for personnel doors that are less than 7.6 m (25 ft) from the nearest edge of the working space?
Which of the following is true about illumination in working spaces around electrical equipment?
Which of the following is true about illumination in working spaces around electrical equipment?
Which of the following is true about the dedicated electrical space for equipment installations?
Which of the following is true about the dedicated electrical space for equipment installations?
Which of the following enclosure types is typically used in conjunction with the term 'raintight'?
Which of the following enclosure types is typically used in conjunction with the term 'raintight'?
Which of the following enclosure types is typically used in conjunction with the term 'driptight'?
Which of the following enclosure types is typically used in conjunction with the term 'driptight'?
Which of the following enclosure types is typically used in conjunction with the term 'dusttight'?
Which of the following enclosure types is typically used in conjunction with the term 'dusttight'?
Which enclosure type provides protection against prolonged submersion for both outdoor and indoor use?
Which enclosure type provides protection against prolonged submersion for both outdoor and indoor use?
Which one of these is the minimum clear distance required for working space in Condition 2?
Which one of these is the minimum clear distance required for working space in Condition 2?
According to NFPA 70E, which of the following electrical equipment in other than dwelling units is required to be field or factory marked to warn qualified persons of potential electric arc flash hazards?
According to NFPA 70E, which of the following electrical equipment in other than dwelling units is required to be field or factory marked to warn qualified persons of potential electric arc flash hazards?
What is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
What is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
Which of the following types of equipment is covered by Part IV of Article 110?
Which of the following types of equipment is covered by Part IV of Article 110?
How should high-voltage conductors be installed in tunnels?
How should high-voltage conductors be installed in tunnels?
What is the purpose of bonding and equipment grounding conductors in tunnels?
What is the purpose of bonding and equipment grounding conductors in tunnels?
What is the minimum clear distance required for working space around electrical equipment in Condition 2?
What is the minimum clear distance required for working space around electrical equipment in Condition 2?
According to the text, what is the minimum clear distance specified in Table 110.34(A) for equipment operating at 1001-2500 volts-to-ground?
According to the text, what is the minimum clear distance specified in Table 110.34(A) for equipment operating at 1001-2500 volts-to-ground?
According to the text, when are smaller working spaces permitted for low voltage electrical equipment?
According to the text, when are smaller working spaces permitted for low voltage electrical equipment?
According to the text, what is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
According to the text, what is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
According to the text, what should electricians do to determine the location of the high leg within a system?
According to the text, what should electricians do to determine the location of the high leg within a system?
According to NFPA 70E, what is the purpose of keeping the entrance to buildings, vaults, rooms, or enclosures containing exposed live parts or exposed conductors operating at over 1000 volts, nominal, locked?
According to NFPA 70E, what is the purpose of keeping the entrance to buildings, vaults, rooms, or enclosures containing exposed live parts or exposed conductors operating at over 1000 volts, nominal, locked?
According to the text, what is the minimum elevation above the floor or other working surface for live parts of electrical equipment operating at 601 volts to 1000 volts between ungrounded conductors?
According to the text, what is the minimum elevation above the floor or other working surface for live parts of electrical equipment operating at 601 volts to 1000 volts between ungrounded conductors?
According to the text, what is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
According to the text, what is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
According to the text, what is the purpose of proper warning labels on electrical equipment?
According to the text, what is the purpose of proper warning labels on electrical equipment?
Which of the following is true about the design and installation of electrical enclosures covered by Part V of this article in an industrial wiring system?
Which of the following is true about the design and installation of electrical enclosures covered by Part V of this article in an industrial wiring system?
What are the requirements for the design of manholes, vaults, and their means of access?
What are the requirements for the design of manholes, vaults, and their means of access?
What is the purpose of design documentation for electrical enclosures covered by Part V of this article in an industrial wiring system?
What is the purpose of design documentation for electrical enclosures covered by Part V of this article in an industrial wiring system?
Which of the following is true about the working space requirements for electrical equipment?
Which of the following is true about the working space requirements for electrical equipment?
According to the text, what is the purpose of suitable guards for equipment exposed to physical damage from vehicular traffic?
According to the text, what is the purpose of suitable guards for equipment exposed to physical damage from vehicular traffic?
Which of the following is true about the working space requirement for equipment located outdoors and accessible to unqualified persons?
Which of the following is true about the working space requirement for equipment located outdoors and accessible to unqualified persons?
According to the text, what is the minimum depth of working space required for equipment operating at 0-150 volts?
According to the text, what is the minimum depth of working space required for equipment operating at 0-150 volts?
Which one of these is the minimum vertical headroom required for a manhole opening located within 300 mm (1 ft) horizontally from the adjacent interior side wall of the enclosure?
Which one of these is the minimum vertical headroom required for a manhole opening located within 300 mm (1 ft) horizontally from the adjacent interior side wall of the enclosure?
Which one of these is the minimum clear work space required where cables are located on both sides?
Which one of these is the minimum clear work space required where cables are located on both sides?
Which one of these is the maximum weight for a manhole access cover to be considered as meeting the requirements of 110.26(F) and 110.34(C)?
Which one of these is the maximum weight for a manhole access cover to be considered as meeting the requirements of 110.26(F) and 110.34(C)?
According to the text, what color should the terminal for the grounded conductor be identified as for receptacles, polarized attachment plugs, and cord connectors for plugs and polarized plugs?
According to the text, what color should the terminal for the grounded conductor be identified as for receptacles, polarized attachment plugs, and cord connectors for plugs and polarized plugs?
What is the purpose of re-identifying a white or gray insulated conductor as an ungrounded conductor in switch loops?
What is the purpose of re-identifying a white or gray insulated conductor as an ungrounded conductor in switch loops?
According to the text, what is the required color for the insulation of the conductor attached to the screw shell of screw shell devices with attached leads?
According to the text, what is the required color for the insulation of the conductor attached to the screw shell of screw shell devices with attached leads?
What is the required color for the insulation of the conductor entrance hole for the connection to the terminal intended for the grounded conductor if the terminal is not visible?
What is the required color for the insulation of the conductor entrance hole for the connection to the terminal intended for the grounded conductor if the terminal is not visible?
Which of the following is true about the requirements for access to manholes in electrical installations?
Which of the following is true about the requirements for access to manholes in electrical installations?
What is the minimum size requirement for rectangular access openings in manholes?
What is the minimum size requirement for rectangular access openings in manholes?
Which of the following is true about the requirements for access to vaults and tunnels in electrical installations?
Which of the following is true about the requirements for access to vaults and tunnels in electrical installations?
What is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
What is the purpose of the high-leg marking on a 240/120-volt, 3-phase, 4-wire delta system?
According to the text, how can an overload condition exist without being detected or responded to?
According to the text, how can an overload condition exist without being detected or responded to?
According to the text, when does the possibility of overload exist in multiwire single-phase and 3-phase circuits?
According to the text, when does the possibility of overload exist in multiwire single-phase and 3-phase circuits?
According to the text, when is it necessary to group all conductors of a circuit together in at least one location?
According to the text, when is it necessary to group all conductors of a circuit together in at least one location?
According to the text, how should grounded conductors of 6 AWG or smaller be identified?
According to the text, how should grounded conductors of 6 AWG or smaller be identified?
Which of the following is true about the grounding of conductors in multiwire branch circuits?
Which of the following is true about the grounding of conductors in multiwire branch circuits?
Which of the following is true about the grounded conductor in a multiwire branch circuit?
Which of the following is true about the grounded conductor in a multiwire branch circuit?
What is the purpose of marking the grounded circuit conductors in an enclosure with multiple neutral conductors?
What is the purpose of marking the grounded circuit conductors in an enclosure with multiple neutral conductors?
What is the concern with multiple circuits sharing a neutral conductor in a multiwire branch circuit?
What is the concern with multiple circuits sharing a neutral conductor in a multiwire branch circuit?
Which of the following is true about the identification of grounded conductors in multiconductor cables?
Which of the following is true about the identification of grounded conductors in multiconductor cables?
What is the purpose of identifying the grounded conductors associated with one system from the grounded conductors of another system in a common enclosure?
What is the purpose of identifying the grounded conductors associated with one system from the grounded conductors of another system in a common enclosure?
Which of the following is true about the use of insulation color or stripes for grounded conductors in circuits of 50 volts or more?
Which of the following is true about the use of insulation color or stripes for grounded conductors in circuits of 50 volts or more?
What is the purpose of the Informational Note regarding the use of gray insulation and marking for grounded conductors?
What is the purpose of the Informational Note regarding the use of gray insulation and marking for grounded conductors?
