Journeyman Electrician Exam
Hazardous Locations Practice Questions
20 practice questions with detailed explanations — aligned to the Journeyman Electrician Exam.
Q1.A location where flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitible mixtures is classified as:
A.Class IB.Class IIC.Class IIID.UnclassifiedA. Class IExplanation: NEC 500.5(B) defines Class I locations as those where flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are present.
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Q2.Which classification applies to areas where combustible dust is present?
A.Class IB.Class IIC.Class IIID.Class IVB. Class IIExplanation: NEC 500.5(C) defines Class II locations as those hazardous due to the presence of combustible dust.
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Q3.A conduit seal shall be installed within _____ of the enclosure for an explosionproof enclosure containing a switch.
A.6 inchesB.12 inchesC.18 inchesD.24 inchesC. 18 inchesExplanation: NEC 501.15(A)(1) requires a conduit seal within 18 inches of an enclosure containing apparatus that may produce arcs, sparks, or high temperatures (Class I, Div 1).
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Q4.Threaded rigid metal conduit installed in a Class I, Division 1 location must be engaged with at least _____ full threads.
A.3B.4C.5D.6C. 5Explanation: NEC 500.8(E) requires that threaded entries into explosionproof equipment be made up with at least 5 threads fully engaged.
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Q5.In a Commercial Garage (repair shop), the area up to 18 inches above the floor is classified as:
A.Class I, Division 1B.Class I, Division 2C.Class II, Division 1D.UnclassifiedB. Class I, Division 2Explanation: NEC 511.3(C) classifies the floor area (up to 18 inches) in major repair garages as Class I, Division 2 (unless ventilation allows for unclassified, but the standard unventilated default is Class I Div 2).
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Q6.Which wiring method is permitted in a Class I, Division 1 location?
A.Electrical Metallic Tubing (EMT)B.Rigid Metal Conduit (RMC) with threaded fittingsC.PVC Conduit (Schedule 80)D.Type NM CableB. Rigid Metal Conduit (RMC) with threaded fittingsExplanation: NEC 501.10(A) permits Threaded Rigid Metal Conduit (RMC) and Threaded Steel Intermediate Metal Conduit (IMC). EMT and PVC are generally not permitted in Div 1.
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Q7.Intrinsically safe systems are permitted in:
A.Class I locations onlyB.Class II locations onlyC.Class III locations onlyD.All Hazardous (Classified) LocationsD. All Hazardous (Classified) LocationsExplanation: NEC 504.10 permits Intrinsically Safe systems in any hazardous (classified) location for which they are approved.
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Q8.In an aircraft hangar, the pit in the floor is classified as:
A.Class I, Division 1B.Class I, Division 2C.Class II, Division 1D.UnclassifiedA. Class I, Division 1Explanation: NEC 513.3(A) classifies any pit or depression below the level of the hangar floor as Class I, Division 1.
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Q9.The sealing compound in a conduit seal must be at least _____ thick.
A.3/8 inchB.1/2 inchC.5/8 inchD.The trade size of the conduit, but not less than 5/8 inchD. The trade size of the conduit, but not less than 5/8 inchExplanation: NEC 501.15(C)(3) requires the thickness of the sealing compound to be not less than the trade size of the conduit and in no case less than 5/8 inch.
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Q10.Equipment installed in a Class III location (Ignitible Fibers/Flyings) must be designed to:
A.Withstand an internal explosionB.Prevent the entry of fibers and flyingsC.Be submerged in oilD.Vent gases to the outsideB. Prevent the entry of fibers and flyingsExplanation: NEC 500.5(D) / 503. Equipment in Class III locations must be dusttight to prevent the entry of ignitible fibers/flyings.
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Q11.For a gasoline dispensing station, the area within 18 inches horizontally of the dispenser enclosure and extending to 4 feet vertically is:
A.Class I, Division 1B.Class I, Division 2C.UnclassifiedD.Class II, Division 1B. Class I, Division 2Explanation: Table 514.3(B)(1): The area 18 inches horizontally from the dispenser enclosure extending 4 feet up is Class I, Division 2. (Inside the enclosure up to 4 ft is Div 1).
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Q12.A 'Zone 0' classification is most similar to:
A.Class I, Division 1 (Continuous hazard)B.Class I, Division 2C.Class II, Division 1D.UnclassifiedA. Class I, Division 1 (Continuous hazard)Explanation: NEC 505.5(B)(1): Zone 0 is an area where ignitible concentrations of flammable gases are present continuously or for long periods (similar to the most severe part of Div 1).
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Q13.In a Spray Application Area (Spray Booth), motors located in the spray area must be:
A.Totally Enclosed Fan Cooled (TEFC)B.Explosionproof and listed for the locationC.Standard open drip-proofD.Located outside the booth onlyB. Explosionproof and listed for the locationExplanation: NEC 516.3 / 501. Motors in the Class I Div 1 spray area must be specifically listed for the location (Explosionproof).
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Q14.Type MI (Mineral Insulated) cable is permitted in Class I, Division 1 locations.
A.TrueB.FalseA. TrueExplanation: NEC 501.10(A)(1) permits Type MI cable with termination fittings listed for the location in Class I, Div 1.
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Q15.Seals are required in Class I, Division 1 locations where the conduit leaves the Division 1 area and enters a:
A.Non-hazardous areaB.Division 2 areaC.Both A and BD.None of the aboveC. Both A and BExplanation: NEC 501.15(A)(4) requires a boundary seal where the conduit leaves the Div 1 area and enters a Div 2 or unclassified area.
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Q16.Which part of a Health Care Facility is considered a hazardous location involving flammable anesthetics?
A.Patient RoomsB.Operating Rooms (if flammable anesthetics are used)C.CorridorsD.Waiting AreasB. Operating Rooms (if flammable anesthetics are used)Explanation: NEC 517.60. While flammable anesthetics are rare today, the code classifies areas where they are used as hazardous. (Most modern ORs are unclassified because non-flammable agents are used, but the definition remains).
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Q17.In a Class II location, dust-ignitionproof enclosures are required for:
A.SwitchesB.Circuit BreakersC.Motor ControllersD.All of the aboveD. All of the aboveExplanation: NEC 502.115 requires switches, circuit breakers, and controllers in Class II locations to be in dust-ignitionproof enclosures.
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Q18.Conduit unions used in Class I locations must be:
A.Standard malleable ironB.Explosionproof / Listed for the locationC.Die-cast zincD.PVCB. Explosionproof / Listed for the locationExplanation: Fittings and unions in Class I locations must be listed for the location (Explosionproof).
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Q19.For a Bulk Storage Plant (Fuel), the area 5 feet around a vent pipe opening is:
A.Class I, Division 1B.Class I, Division 2C.UnclassifiedD.Class II, Division 1A. Class I, Division 1Explanation: Table 515.3: The area within 5 feet of a vent opening is Class I, Division 1.
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Q20.Which of the following wiring methods is NOT permitted in Class II, Division 1?
A.Threaded RMCB.Type MI CableC.Electrical Metallic Tubing (EMT)D.Type MC Cable (listed for location)C. Electrical Metallic Tubing (EMT)Explanation: NEC 502.10(A). EMT is not permitted in Class II, Division 1 (Dust). It is permitted in Div 2.
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