Podcast
Questions and Answers
According to NFPA 497, which group classification includes atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercial alloys?
According to NFPA 497, which group classification includes atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercial alloys?
- Group F
- Group G
- Group E (correct)
- Group H
According to NFPA 497, which group classification includes atmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrapped volatiles?
According to NFPA 497, which group classification includes atmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrapped volatiles?
- Group E
- Group F (correct)
- Group H
- Group G
According to NFPA 497, which group classification includes atmospheres containing combustible dusts not included in Group E or Group F, such as flour, grain, wood, plastic, and chemicals?
According to NFPA 497, which group classification includes atmospheres containing combustible dusts not included in Group E or Group F, such as flour, grain, wood, plastic, and chemicals?
- Group F
- Group E
- Group G (correct)
- Group H
According to NFPA 499, which class of combustible fibers/flyings shall not be further grouped?
According to NFPA 499, which class of combustible fibers/flyings shall not be further grouped?
Which type of motors must consider abnormal load conditions when evaluating external temperatures?
Which type of motors must consider abnormal load conditions when evaluating external temperatures?
When is awareness of increased temperatures in motors controlled by variable-speed drives important?
When is awareness of increased temperatures in motors controlled by variable-speed drives important?
What happens when flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors and combustible dusts are or might be present at the same time?
What happens when flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors and combustible dusts are or might be present at the same time?
Which of the following is true about Class I, Group C materials?
Which of the following is true about Class I, Group C materials?
Which of the following is true about Class I, Group D materials?
Which of the following is true about Class I, Group D materials?
Which of the following is true about Class I, Group D materials?
Which of the following is true about Class I, Group D materials?
Which protection technique is permitted for equipment in Class II, Division 2 or Class III, Division 1 or 2 locations?
Which protection technique is permitted for equipment in Class II, Division 2 or Class III, Division 1 or 2 locations?
What is the process of supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the initial concentration of any flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors to an acceptable level called?
What is the process of supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the initial concentration of any flammable gases, flammable liquid–produced vapors, or combustible liquid–produced vapors to an acceptable level called?
Which protection technique is permitted for equipment in Class I, Division 1 or Division 2; Class II, Division 1 or Division 2; or Class III, Division 1 or Division 2 locations?
Which protection technique is permitted for equipment in Class I, Division 1 or Division 2; Class II, Division 1 or Division 2; or Class III, Division 1 or Division 2 locations?
Which protection technique is permitted for current-interrupting contacts in Class I, Division 2 locations?
Which protection technique is permitted for current-interrupting contacts in Class I, Division 2 locations?
According to NFPA 30, what is considered adequate ventilation?
According to NFPA 30, what is considered adequate ventilation?
In a Class I, Division 2 hazardous location, what activates an alarm in a detection system for flammable gases?
In a Class I, Division 2 hazardous location, what activates an alarm in a detection system for flammable gases?
What is the suitable power disconnecting device for a detection system for flammable gases located inside a building or enclosed space?
What is the suitable power disconnecting device for a detection system for flammable gases located inside a building or enclosed space?
What is the suitable power disconnecting device for a detection system for flammable gases located outside a building or enclosed space?
What is the suitable power disconnecting device for a detection system for flammable gases located outside a building or enclosed space?
Which protection technique is permitted for equipment in Class I or II, Division 1 or 2 locations for which the equipment is identified?
Which protection technique is permitted for equipment in Class I or II, Division 1 or 2 locations for which the equipment is identified?
Which protection technique is permitted for equipment in Class I or II, Division 2 locations for which the equipment is identified?
Which protection technique is permitted for equipment in Class I or II, Division 2 locations for which the equipment is identified?
Which protection technique is permitted for skin effect trace heating equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 2 locations for which it is listed?
Which protection technique is permitted for skin effect trace heating equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 2 locations for which it is listed?
Which protection technique is permitted for electrical resistance trace heating equipment in Class I, Division 1; Class I, Division 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; or Class III, Division 2 locations for which it is listed?
Which protection technique is permitted for electrical resistance trace heating equipment in Class I, Division 1; Class I, Division 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; or Class III, Division 2 locations for which it is listed?
Which of the following is NOT a requirement for Class I equipment in hazardous locations?
Which of the following is NOT a requirement for Class I equipment in hazardous locations?
Which of the following is NOT a requirement for Class II equipment in hazardous locations?
Which of the following is NOT a requirement for Class II equipment in hazardous locations?
Which of the following is NOT a requirement for Class III equipment in hazardous locations?
Which of the following is NOT a requirement for Class III equipment in hazardous locations?
Which of the following is a requirement for equipment installed in a Class I, Division 1 location?
Which of the following is a requirement for equipment installed in a Class I, Division 1 location?
Which of the following is a requirement for equipment installed in a Class I, Division 2 location?
Which of the following is a requirement for equipment installed in a Class I, Division 2 location?
What is the process of supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the initial concentration of any flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors to an acceptable level called?
What is the process of supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the initial concentration of any flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors to an acceptable level called?
Which of the following is NOT a requirement for Class II equipment in hazardous locations?
Which of the following is NOT a requirement for Class II equipment in hazardous locations?
Which type of conduit is permitted when metal conduit does not provide the necessary corrosion resistance?
Which type of conduit is permitted when metal conduit does not provide the necessary corrosion resistance?
Which type of conduit is permitted in restricted industrial establishments?
Which type of conduit is permitted in restricted industrial establishments?
Which types of optical fiber cable are permitted to be installed in cable trays or any other raceway?
Which types of optical fiber cable are permitted to be installed in cable trays or any other raceway?
What is the minimum temperature at which a liquid gives off enough vapor to form an ignitible mixture with air?
What is the minimum temperature at which a liquid gives off enough vapor to form an ignitible mixture with air?
What is the relationship between ignition temperature and flash point?
What is the relationship between ignition temperature and flash point?
What is the maximum surface temperature under operating conditions for equipment with ignitible fibers/flyings present?
What is the maximum surface temperature under operating conditions for equipment with ignitible fibers/flyings present?
What is the suitable power disconnecting device for a detection system for flammable gases located inside a building or enclosed space?
What is the suitable power disconnecting device for a detection system for flammable gases located inside a building or enclosed space?
Which standard provides threading specifications for metric-threaded entries?
Which standard provides threading specifications for metric-threaded entries?
Which type of cables need to be installed to address the associated fire hazard and sealed to address the associated explosion hazard?
Which type of cables need to be installed to address the associated fire hazard and sealed to address the associated explosion hazard?
What is the wavelength range for evaluating the risk of ignition from optical radiation in hazardous areas?
What is the wavelength range for evaluating the risk of ignition from optical radiation in hazardous areas?
What is the minimum thickness of the concrete envelope required for PVC conduit, RTRC conduit, or HDPE conduit in Class I, Division 1 locations?
What is the minimum thickness of the concrete envelope required for PVC conduit, RTRC conduit, or HDPE conduit in Class I, Division 1 locations?
Which standard provides information on construction, testing, and marking of cables and cable fittings for use in hazardous (classified) locations?
Which standard provides information on construction, testing, and marking of cables and cable fittings for use in hazardous (classified) locations?
In restricted industrial establishments, what type of cable is permitted for use where the cable is terminated with fittings listed for the location and installed in accordance with Part II of Article 337?
In restricted industrial establishments, what type of cable is permitted for use where the cable is terminated with fittings listed for the location and installed in accordance with Part II of Article 337?
Which type of cable is permitted in industrial establishments where a flexible connection is necessary?
Which type of cable is permitted in industrial establishments where a flexible connection is necessary?
What type of cable is permitted for Class 2 and Class 3 circuits, including installation in cable tray systems?
What type of cable is permitted for Class 2 and Class 3 circuits, including installation in cable tray systems?
What is the purpose of marking the temperature class on electrical equipment installed in a Class II, Division 1 location?
What is the purpose of marking the temperature class on electrical equipment installed in a Class II, Division 1 location?
What is the purpose of marking the maximum safe operating temperature on electrical equipment for Class I and Class II locations?
What is the purpose of marking the maximum safe operating temperature on electrical equipment for Class I and Class II locations?
What type of equipment is not required to have a marked operating temperature or temperature class?
What type of equipment is not required to have a marked operating temperature or temperature class?
When is it acceptable for equipment in Class I or II, Division 1 or 2 locations to not be marked with the class, division, group, temperature class, or ambient temperature range?
When is it acceptable for equipment in Class I or II, Division 1 or 2 locations to not be marked with the class, division, group, temperature class, or ambient temperature range?
Which type of cable is required for the last 600 mm (24 in.) of the underground run to emergence or to the point of connection to the aboveground raceway?
Which type of cable is required for the last 600 mm (24 in.) of the underground run to emergence or to the point of connection to the aboveground raceway?
In restricted industrial establishments, which type of cable is listed for use in Class I, Zone 1 or Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath, an overall jacket of suitable polymeric material, and a separate equipment grounding conductor(s)?
In restricted industrial establishments, which type of cable is listed for use in Class I, Zone 1 or Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath, an overall jacket of suitable polymeric material, and a separate equipment grounding conductor(s)?
Which type of cable is listed for use in Class I, Division 1 or Zone 1 locations, with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymeric material?
Which type of cable is listed for use in Class I, Division 1 or Zone 1 locations, with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymeric material?
Which type of cable is installed in raceways in accordance with 501.10(A) and shall be sealed in accordance with 501.15?
Which type of cable is installed in raceways in accordance with 501.10(A) and shall be sealed in accordance with 501.15?
Which type of cable is permitted for Class 2 and Class 3 circuits, including installation in cable tray systems?
Which type of cable is permitted for Class 2 and Class 3 circuits, including installation in cable tray systems?
What is the suitable power disconnecting device for a detection system for flammable gases located outside a building or enclosed space?
What is the suitable power disconnecting device for a detection system for flammable gases located outside a building or enclosed space?
Which type of cable is listed for use in Class I, Division 1 or Zone 1 locations, with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymeric material?
Which type of cable is listed for use in Class I, Division 1 or Zone 1 locations, with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymeric material?
Which type of wiring method is permitted for nonincendive field wiring in unclassified locations?
Which type of wiring method is permitted for nonincendive field wiring in unclassified locations?
When are explosionproof boxes and fittings required in Class I, Division 2 locations?
When are explosionproof boxes and fittings required in Class I, Division 2 locations?
What is the purpose of sealing compound used in Type MI cable termination fittings?
What is the purpose of sealing compound used in Type MI cable termination fittings?
What is the maximum operating temperature for equipment in Class I, Division 2 locations if it does not require explosionproof protection?
What is the maximum operating temperature for equipment in Class I, Division 2 locations if it does not require explosionproof protection?
Which type of cable is specifically listed for use as a wiring method in Class I, Division 1 locations?
Which type of cable is specifically listed for use as a wiring method in Class I, Division 1 locations?
What does 501.15(D)(1) require for cables installed in Class I, Division 1 locations?
What does 501.15(D)(1) require for cables installed in Class I, Division 1 locations?
How do the sealing requirements for cables installed in Class I, Division 1 locations differ from the requirements for sealing conduits?
How do the sealing requirements for cables installed in Class I, Division 1 locations differ from the requirements for sealing conduits?
Which type of location requires conduit seals to be located in accordance with 501.15(B)(1) and (B)(2)?
Which type of location requires conduit seals to be located in accordance with 501.15(B)(1) and (B)(2)?
For connections to explosionproof enclosures, what is required in Class I, Division 2 locations?
For connections to explosionproof enclosures, what is required in Class I, Division 2 locations?
In Class I, Division 2 locations, where should a conduit seal be required?
In Class I, Division 2 locations, where should a conduit seal be required?
What is the requirement for the conduit run between the conduit seal and the point at which the conduit leaves the Division 2 location?
What is the requirement for the conduit run between the conduit seal and the point at which the conduit leaves the Division 2 location?
Which type of fittings are required to have an integral sealing means or sealing fittings listed for the location?
Which type of fittings are required to have an integral sealing means or sealing fittings listed for the location?
What is the minimum thickness of the sealing compound installed in completed seals, other than listed cable sealing fittings?
What is the minimum thickness of the sealing compound installed in completed seals, other than listed cable sealing fittings?
What is the maximum permitted fill for most conduit seals?
What is the maximum permitted fill for most conduit seals?
What type of cable shall be sealed with a listed fitting after the jacket and any other covering have been removed?
What type of cable shall be sealed with a listed fitting after the jacket and any other covering have been removed?
Which of the following is a requirement for installing a conduit seal in a Division 1 location?
Which of the following is a requirement for installing a conduit seal in a Division 1 location?
In a Class I, Division 2 location, when is a conduit seal required between two enclosures?
In a Class I, Division 2 location, when is a conduit seal required between two enclosures?
Where should a conduit seal be located when the boundary is between a Division 1 and Division 2 location?
Where should a conduit seal be located when the boundary is between a Division 1 and Division 2 location?
What is the purpose of a conduit seal in a hazardous location?
What is the purpose of a conduit seal in a hazardous location?
Which of the following is true about the passage of gas through a seal in smaller conductors under normal conditions?
Which of the following is true about the passage of gas through a seal in smaller conductors under normal conditions?
Where should conduit seals be located in Class I, Division 1 locations?
Where should conduit seals be located in Class I, Division 1 locations?
Which of the following conditions does NOT require a conduit seal in Class I, Division 1 locations?
Which of the following conditions does NOT require a conduit seal in Class I, Division 1 locations?
What is the maximum distance conduit seals should be installed from the enclosure in each conduit entry into a pressurized enclosure?
What is the maximum distance conduit seals should be installed from the enclosure in each conduit entry into a pressurized enclosure?
Which type of cables need to be sealed in the conduit within 450 mm (18 in.) of the enclosure and have the cable end sealed within the enclosure to minimize the entrance of gases or vapors and prevent the propagation of flame into the cable core?
Which type of cables need to be sealed in the conduit within 450 mm (18 in.) of the enclosure and have the cable end sealed within the enclosure to minimize the entrance of gases or vapors and prevent the propagation of flame into the cable core?
What is the requirement for cables that are incapable of transmitting gases or vapors through the cable core when installed in conduit?
What is the requirement for cables that are incapable of transmitting gases or vapors through the cable core when installed in conduit?
In addition to sealing the conduit, what must also be sealed to prevent gases from passing through the cable?
In addition to sealing the conduit, what must also be sealed to prevent gases from passing through the cable?
Which type of surge arresters and surge-protective devices are permitted in Class I, Division 1 locations?
Which type of surge arresters and surge-protective devices are permitted in Class I, Division 1 locations?
Where should surge arresters be installed in Class I, Division 2 locations?
Where should surge arresters be installed in Class I, Division 2 locations?
What type of enclosures are required for meters, instruments, and relays in Class I, Division 1 locations?
What type of enclosures are required for meters, instruments, and relays in Class I, Division 1 locations?
What is the requirement for switches, circuit breakers, and make-and-break contacts of pushbuttons, relays, alarm bells, and horns in Class I, Division 1 locations?
What is the requirement for switches, circuit breakers, and make-and-break contacts of pushbuttons, relays, alarm bells, and horns in Class I, Division 1 locations?
Which type of electrical equipment in a hazardous location is not required to have an additional means of sealing in case of a single process seal failure?
Which type of electrical equipment in a hazardous location is not required to have an additional means of sealing in case of a single process seal failure?
What is the suitable type of conductor insulation for areas where condensed vapors or liquids may collect on or come in contact with the insulation?
What is the suitable type of conductor insulation for areas where condensed vapors or liquids may collect on or come in contact with the insulation?
Which type of THWN wire is suitable for exposure to liquid gasoline and gasoline vapors at ordinary ambient temperature?
Which type of THWN wire is suitable for exposure to liquid gasoline and gasoline vapors at ordinary ambient temperature?
What is the maximum voltage limit for uninsulated exposed parts in Class I, Division 1 and 2 locations?
What is the maximum voltage limit for uninsulated exposed parts in Class I, Division 1 and 2 locations?
Which of the following is NOT required for switches, circuit breakers, motor controllers, and fuses in Class I, Division 2 locations?
Which of the following is NOT required for switches, circuit breakers, motor controllers, and fuses in Class I, Division 2 locations?
Which type of enclosures are required for circuit breakers, motor controllers, and switches intended to interrupt current in the normal performance of their function in hazardous locations?
Which type of enclosures are required for circuit breakers, motor controllers, and switches intended to interrupt current in the normal performance of their function in hazardous locations?
Which type of enclosures are required for switches, circuit breakers, motor controllers, and fuses in Class I, Division 2 locations?
Which type of enclosures are required for switches, circuit breakers, motor controllers, and fuses in Class I, Division 2 locations?
Which of the following is NOT a requirement for grounding and bonding in hazardous locations?
Which of the following is NOT a requirement for grounding and bonding in hazardous locations?
Which of the following is true about the bonding requirements for hazardous locations?
Which of the following is true about the bonding requirements for hazardous locations?
Which of the following is NOT a requirement for flexible metal conduit and liquidtight flexible metal conduit in hazardous locations?
Which of the following is NOT a requirement for flexible metal conduit and liquidtight flexible metal conduit in hazardous locations?
Which of the following is NOT a requirement for equipment installed in a Class I, Division 1 location?
Which of the following is NOT a requirement for equipment installed in a Class I, Division 1 location?
What is the purpose of the enhanced level of bonding for all raceways and enclosures in hazardous locations?
What is the purpose of the enhanced level of bonding for all raceways and enclosures in hazardous locations?
Which of the following is a requirement for Class II equipment in hazardous locations?
Which of the following is a requirement for Class II equipment in hazardous locations?
What is the suitable power disconnecting device for a detection system for flammable gases located outside a building or enclosed space?
What is the suitable power disconnecting device for a detection system for flammable gases located outside a building or enclosed space?
Which of the following is true about Class I, Group D materials?
Which of the following is true about Class I, Group D materials?
Which type of cable installed in a Division 2 location is required to be sealed with a listed fitting after the jacket and any other coverings have been removed?
Which type of cable installed in a Division 2 location is required to be sealed with a listed fitting after the jacket and any other coverings have been removed?
When are cables that do not transmit gases or vapors through the cable core required to be sealed?
When are cables that do not transmit gases or vapors through the cable core required to be sealed?
What is the minimum length of a cable run that does not transmit gases or vapors through the cable core in excess of the quantity permitted for seal fittings?
What is the minimum length of a cable run that does not transmit gases or vapors through the cable core in excess of the quantity permitted for seal fittings?
In what type of location shall cables that do not have a gas/vaportight continuous sheath be sealed at the boundary of the Division 2 and unclassified location?
In what type of location shall cables that do not have a gas/vaportight continuous sheath be sealed at the boundary of the Division 2 and unclassified location?
Which of the following is NOT a requirement for Class I equipment in hazardous locations?
Which of the following is NOT a requirement for Class I equipment in hazardous locations?
Which type of cable is required for the last 600 mm (24 in.) of the underground run to emergence or to the point of connection to the aboveground raceway?
Which type of cable is required for the last 600 mm (24 in.) of the underground run to emergence or to the point of connection to the aboveground raceway?
What is the purpose of a conduit seal in a hazardous location?
What is the purpose of a conduit seal in a hazardous location?
Which standard provides information on construction, testing, and marking of cables and cable fittings for use in hazardous (classified) locations?
Which standard provides information on construction, testing, and marking of cables and cable fittings for use in hazardous (classified) locations?
Which type of THWN wire is suitable for exposure to liquid gasoline and gasoline vapors at ordinary ambient temperature?
Which type of THWN wire is suitable for exposure to liquid gasoline and gasoline vapors at ordinary ambient temperature?
Which type of cables need to be sealed in the conduit within 450 mm (18 in.) of the enclosure and have the cable end sealed within the enclosure to minimize the entrance of gases or vapors and prevent the propagation of flame into the cable core?
Which type of cables need to be sealed in the conduit within 450 mm (18 in.) of the enclosure and have the cable end sealed within the enclosure to minimize the entrance of gases or vapors and prevent the propagation of flame into the cable core?
What is the suitable power disconnecting device for a detection system for flammable gases located inside a building or enclosed space?
What is the suitable power disconnecting device for a detection system for flammable gases located inside a building or enclosed space?
Which of the following is NOT a requirement for luminaires in Class I, Division 2 locations?
Which of the following is NOT a requirement for luminaires in Class I, Division 2 locations?
What type of luminaires are generally required in Class I, Division 2 locations?
What type of luminaires are generally required in Class I, Division 2 locations?
What type of luminaires are required for areas with lamps that may reach high surface temperatures?
What type of luminaires are required for areas with lamps that may reach high surface temperatures?
How should pendant luminaires be suspended in Class I, Division 1 locations?
How should pendant luminaires be suspended in Class I, Division 1 locations?
Which of the following is a requirement for motor heaters in hazardous locations?
Which of the following is a requirement for motor heaters in hazardous locations?
Which of the following is true about modern motors with high-temperature insulation systems?
Which of the following is true about modern motors with high-temperature insulation systems?
Which of the following is a requirement for luminaires in Class I, Division 1 locations?
Which of the following is a requirement for luminaires in Class I, Division 1 locations?
Which of the following is a requirement for pendant luminaires in hazardous locations?
Which of the following is a requirement for pendant luminaires in hazardous locations?
Which type of cable is permitted for use in nonincendive field wiring applications other than flexible cables?
Which type of cable is permitted for use in nonincendive field wiring applications other than flexible cables?
Which type of cable assembly is permitted to connect two pieces of electrical equipment in nonincendive field wiring applications?
Which type of cable assembly is permitted to connect two pieces of electrical equipment in nonincendive field wiring applications?
What type of cable connector should be used on one end of the cable when connecting two devices or pieces of electrical utilization equipment together in Class I, Division 2 locations?
What type of cable connector should be used on one end of the cable when connecting two devices or pieces of electrical utilization equipment together in Class I, Division 2 locations?
What is the requirement for terminations in Class I, Division 1 locations for flexible cables?
What is the requirement for terminations in Class I, Division 1 locations for flexible cables?
Which of the following is NOT required for control transformers and resistors used in conjunction with control equipment for motors, generators, and appliances in Class I, Division 1 locations?
Which of the following is NOT required for control transformers and resistors used in conjunction with control equipment for motors, generators, and appliances in Class I, Division 1 locations?
Which of the following is a requirement for motors, generators, and other rotating electrical machinery in Class I, Division 1 locations?
Which of the following is a requirement for motors, generators, and other rotating electrical machinery in Class I, Division 1 locations?
Which of the following is a requirement for motors, generators, and other rotating electrical machinery in Class I, Division 2 locations?
Which of the following is a requirement for motors, generators, and other rotating electrical machinery in Class I, Division 2 locations?
What is the maximum permitted surface temperature for space heaters used to prevent condensation of moisture during shutdown periods in Class I, Division 2 locations?
What is the maximum permitted surface temperature for space heaters used to prevent condensation of moisture during shutdown periods in Class I, Division 2 locations?
Flashcards are hidden until you start studying
