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TEST CHAPTER 5 QUESTIONS AND ANSWERS UPDATED .
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TEST CHAPTER 5 QUESTIONS AND ANSWERSUPDATED 2024 -2025.
All areas designated as hazardous (classified) locations shall be properly ____________ and shall be
available to those authorized to design, install, inspect, maintain, or operate electrical equipment at
these locations. ANS - documented
Hazardous (classified) locations shall be classified depending on the properties of the ____________
that could be present, and the likelihood that a flammable or combustible concentration or quantity is
present. ANS - all of these
- flammable liquid-produced vapors
- flammable gases
- combustible dusts
It is frequently possible to locate much of the equipment in less hazardous or unclassified locations and
thus reduce the amount of special equipment required.
True or False? ANS - True
When determining a Class I, Division 2 location, the ____________ is a factor that should be considered
in determining the classification and extent of the location. ANS - all of these
- quantity of flammable material that might escape in case of an accident
- adequacy of ventilating equipment
- record of the industry or business with respect to explosions or fires
Class II locations are those that are hazardous because of the presence of ____________. ANS -
combustible dust
Locations in which combustible dust is in the air under normal operating conditions in quantities
sufficient to produce explosive or ignitible mixture are classified as ____________. ANS - Class II,
Division 1
,Class III locations are those that are hazardous because of the presence of ____________. ANS - easily
ignitible fibers or materials producing combustible flyings
Class III, Division ____________ locations include areas where easily ignitible fibers/flyings are handled,
manufactured, or used. ANS - 1
A Class III, Division ____________ location is where easily ignitible fibers/flyings are stored or handled
but not manufactured. ANS - 2
Acceptable protection techniques for electrical and electronic equipment in hazardous (classified)
locations includes ____________ equipment. ANS - all of these
- explosionproof
-dust-ignitionproof
- dusttight
Suitability of identified equipment for use in a hazardous (classified) location shall be determines by
____________. ANS - any of these
- equipment listing or labeling
- evidence of equipment evaluation from a qualified testing laboratory or inspection agency concerned
with production evaluation
- evidence acceptable to the authority having jurisdiction such as a manufacturer's self-evaluation or an
owner's engineering judgement
Equipment shall be identified not only for the class of hazardous (classified) location, but also for the
explosive, combustible, or ignitible properties of the specific ____________ present. ANS - any of these
- gas or vapor
- dust
- fibers/flyings
Threaded conduits or fittings installed in hazardous (classified) locations shall be made wrench tight to
____________. ANS - a and b
- prevent sparking when a fault current flows through conduit system
, - ensure the explosion proof integrity of the conduit system where applicable
Equipment used in hazardous (classified) locations with metric threaded entries shall be installed using
____________. ANS - b or c
- listed conduit fittings
- listed cable fittings
An optical fiber cable, with or without current-carrying conductors (composite optical fiber cable), shall
be installed to address the associated fires hazard and sealed to address the associated explosion hazard
in accordance with Articles 500, 501, 502, or 503.
True or False? ANS - True
Article 501 covers the requirements for electrical and electronic equipment and wiring for all voltages in
Class I locations where fire or explosion hazards may exist due to flammable ____________. ANS - any
of these
- gases
- vapors
- liquids
Wiring methods and materials permitted in Class I, Division 1 locations include ____________. ANS - all
of these
- threaded rigid metal or threaded steel IMC
- flexible fittings listed for Class I, Division 1 locations
- boxes approved for Class I, Division 1 locations
Type PVC conduit, Type RTRC conduit, and Type HDPE conduit shall be permitted in Class I, Division 1
underground locations where encased in a concrete envelope a minimum of _________ in. thick and
provided with not less than _________ in. of cover measured from the top of the conduit to grade ANS -
2, 24
MI cable terminated with fittings listed for the location is allowed in Class I, Division 1 locations.
True or False? ANS - True
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