2026 NICET LEVEL 1 QUESTIONS AND ANSWERS
RATED A+
✔✔Class 1 Division 2 - ✔✔Gases and papers will normally be confined within close
containers or systems which can only answer escape in the case of accidental rupture,
breakdown or abnormal operation of equipment does normally provide and buy a
positive mechanical ventilation
✔✔Class 2 Division 1 - ✔✔Combustible dust is in the air under normal operating
conditions, mechanical failure or abnormal operation of machinery or equipment might
cause such explosive or ignitable mixtures or quantities sufficient to be hazardous.
✔✔Class 2 Division 2 - ✔✔Combustible dust due to abnormal operations may be
present in the air in quantity sufficient to produce explosive or ignitable mixtures as a
result of infrequent a functioning and handling of processing equipment becoming
suspended in the air or dust accumulations on in or in vicinity of equipment could be
sufficient to interfere with safety dissipation of heat from electrical equipment
✔✔Class 3 Division 1 - ✔✔Location in which easily ignitable fibers or flyings are
handled, manufactured, or used
✔✔Class 3 Division 2 - ✔✔Location in which easily ignitable fibers or flying's are stored
or handled other than the process of manufacture.
✔✔Group A - ✔✔Acetylene, class 1 group
✔✔Group B - ✔✔Flammable gas and vapor MESG value less than or equal to .45 mm
or MIC ratio of 0.40
✔✔Group C - ✔✔Flammable gas or vapor with MESG of .45 -.75 mm or MIC ratio .40-
.80
✔✔Group D - ✔✔Gas or vapors with MESG above .75 mm or MIC ratio above .80
, ✔✔Group F - ✔✔Atmospheres containing can bustable carbonaceous dust that have
more than 8% total entrapped volatiles, I.e. charcoal
✔✔Group G - ✔✔Atmospheres containing come bustable does not included in Group E
or F including flour, green, wood, plastic and chemicals.
✔✔Class 1 circuit - ✔✔The portion of the wiring system between the load side of the
overcurrent device.
✔✔Class 2 circuit - ✔✔The portion of wiring system between the load side of the class 2
power source and the connected equipment.
✔✔Class 3 circuit - ✔✔The portion of the wiring system between the load side class 3
power source and the connected equipment.
✔✔Single conductors in a fire alarm system shall not be smaller than - ✔✔18 AWG
✔✔Percentage of cross-section of conduit of 1 conductor - ✔✔53%
✔✔Percentage of cross-section of conduit of 2 conductors - ✔✔31%
✔✔Percentage of cross-section of conduit of more than 2 conductors - ✔✔40%
✔✔ When a device is inaccessible due to excessive height, such as an atrium, what it
the maximum interval for testing? - ✔✔18 months
✔✔When installing a wall-mounted fire telephone appliance to the public, what is the
acceptable maximum mounting height from the floor? - ✔✔66 inches
✔✔Elevator lobby smoke detectors shall be mounted within a maximum of which
distance from the center-line of the door? - ✔✔21 feet
✔✔At minimum, when working near power lines with voltage of 600 volts and lower, an
aerial lift operator shall maintain which distance from the lines? - ✔✔10 feet
✔✔The use of unprotected EMT shall be permitted under which conditions? - ✔✔when
in direct contact with the earth
✔✔According to NFPA 70, what is the maximum unsupported length of 1/2-inch flexible
metallic conduit where flexibility is required after installation? - ✔✔4 1/2 feet
RATED A+
✔✔Class 1 Division 2 - ✔✔Gases and papers will normally be confined within close
containers or systems which can only answer escape in the case of accidental rupture,
breakdown or abnormal operation of equipment does normally provide and buy a
positive mechanical ventilation
✔✔Class 2 Division 1 - ✔✔Combustible dust is in the air under normal operating
conditions, mechanical failure or abnormal operation of machinery or equipment might
cause such explosive or ignitable mixtures or quantities sufficient to be hazardous.
✔✔Class 2 Division 2 - ✔✔Combustible dust due to abnormal operations may be
present in the air in quantity sufficient to produce explosive or ignitable mixtures as a
result of infrequent a functioning and handling of processing equipment becoming
suspended in the air or dust accumulations on in or in vicinity of equipment could be
sufficient to interfere with safety dissipation of heat from electrical equipment
✔✔Class 3 Division 1 - ✔✔Location in which easily ignitable fibers or flyings are
handled, manufactured, or used
✔✔Class 3 Division 2 - ✔✔Location in which easily ignitable fibers or flying's are stored
or handled other than the process of manufacture.
✔✔Group A - ✔✔Acetylene, class 1 group
✔✔Group B - ✔✔Flammable gas and vapor MESG value less than or equal to .45 mm
or MIC ratio of 0.40
✔✔Group C - ✔✔Flammable gas or vapor with MESG of .45 -.75 mm or MIC ratio .40-
.80
✔✔Group D - ✔✔Gas or vapors with MESG above .75 mm or MIC ratio above .80
, ✔✔Group F - ✔✔Atmospheres containing can bustable carbonaceous dust that have
more than 8% total entrapped volatiles, I.e. charcoal
✔✔Group G - ✔✔Atmospheres containing come bustable does not included in Group E
or F including flour, green, wood, plastic and chemicals.
✔✔Class 1 circuit - ✔✔The portion of the wiring system between the load side of the
overcurrent device.
✔✔Class 2 circuit - ✔✔The portion of wiring system between the load side of the class 2
power source and the connected equipment.
✔✔Class 3 circuit - ✔✔The portion of the wiring system between the load side class 3
power source and the connected equipment.
✔✔Single conductors in a fire alarm system shall not be smaller than - ✔✔18 AWG
✔✔Percentage of cross-section of conduit of 1 conductor - ✔✔53%
✔✔Percentage of cross-section of conduit of 2 conductors - ✔✔31%
✔✔Percentage of cross-section of conduit of more than 2 conductors - ✔✔40%
✔✔ When a device is inaccessible due to excessive height, such as an atrium, what it
the maximum interval for testing? - ✔✔18 months
✔✔When installing a wall-mounted fire telephone appliance to the public, what is the
acceptable maximum mounting height from the floor? - ✔✔66 inches
✔✔Elevator lobby smoke detectors shall be mounted within a maximum of which
distance from the center-line of the door? - ✔✔21 feet
✔✔At minimum, when working near power lines with voltage of 600 volts and lower, an
aerial lift operator shall maintain which distance from the lines? - ✔✔10 feet
✔✔The use of unprotected EMT shall be permitted under which conditions? - ✔✔when
in direct contact with the earth
✔✔According to NFPA 70, what is the maximum unsupported length of 1/2-inch flexible
metallic conduit where flexibility is required after installation? - ✔✔4 1/2 feet
