85 Questions
Which type of enclosures are permitted for general-purpose use in Class I, Division 1 locations?
Enclosures in nonincendive circuits
What type of enclosures are required for lightning protective devices and fuses?
General-purpose enclosures
In what type of locations are explosionproof enclosures required for audible signaling devices with make-and-break contacts?
Class I locations
Which type of panelboard is suitable for use in Class II, Division 2, Group F and G locations?
Dust-ignitionproof panelboard
In Class II, Division 1 locations, which components shall be provided with enclosures identified for the location?
Control transformers, solenoids, impedance coils, resistors, and any overcurrent devices or switching mechanisms associated with them
Which division is mentioned in relation to control transformers and resistors?
Division 1
Which type of cable is required to include an equipment grounding conductor in addition to a drain wire?
Type TC-ER cable
What type of wiring method is permitted in Class II, Division 2 locations?
Rigid metal conduit (RMC)
In restricted industrial establishments, which of the following wiring methods provides the required corrosion resistance for the installation environment?
Schedule 80 PVC conduit
What type of cable is suitable for use in Class II, Group E hazardous atmospheres?
Type P cable
Which type of cable should be used in restricted industrial establishments for applications limited to 600 volts nominal or less, where the cable is not subject to physical damage and is terminated with fittings listed for the location?
Type TC-ER-HL cable
What type of cable should be installed in ladder, ventilated trough, or ventilated channel cable trays, with a space not less than the larger cable diameter between the two adjacent cables, unless otherwise protected against dust buildup resulting in increased heat?
Type TC-ER-HL cable
Which cable type should be used in restricted industrial establishments, listed with an overall jacket, that is terminated with fittings listed for the location and installed in accordance with 337.10?
Type P cable with metal braid armor
What type of cable should be used for flexible connections in hazardous (classified) locations, where flexible cords shall comply with 502.140?
Flexible cord listed for extra-hard usage
Which of the following conditions must be met in order for the bonding jumper to not be required in Class II, Division 2 locations?
All of the above conditions must be met
Which of the following is a requirement for surge arresters and surge-protective devices installed in a Class II, Division 1 location?
They must be installed in suitable enclosures
Where is the preferred location for service equipment, switchboards, and panelboards in an electrical installation for hazardous locations?
In less hazardous areas, usually in a separate room
What is the requirement for transformers and capacitors containing a liquid that will burn in Class II, Division 2 locations?
They must be installed in vaults complying with specific regulations
Which one of the following is NOT a suitable method for preventing dust from entering dust-ignitionproof enclosures through the raceway?
A raceway installed in a manner equivalent to 502.15(2) or (3) that extends only horizontally and downward from the dust-ignitionproof enclosures
Which one of the following is NOT a requirement for uninsulated exposed parts in Class II, Divisions 1 and 2 locations?
They shall operate at more than 30 volts
Which one of the following is NOT a requirement for grounding and bonding in hazardous locations?
The locknut-bushing and double-locknut types of contacts shall be depended on for bonding purposes
Which one of the following is a requirement for liquidtight flexible metal conduit in hazardous locations?
It shall include an equipment bonding jumper of the wire type
Which type of location is defined as 'hazardous because of the presence of combustible dust' in the text?
Class II, Division 1
What is the main difference between Class I equipment and Class II equipment mentioned in the text?
Class I equipment is designed to prevent the ignition of layers of dust, while Class II equipment does not address this concern.
Which type of wiring method is permitted in Class II, Division 1 locations according to the text?
Threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC)
Which standard provides methods to minimize the occurrence of fire or explosion in areas where combustible metals or metal dusts are produced, processed, finished, handled, stored, and used?
NFPA 484
Which one of the following is a requirement for control transformers, solenoids, and impedance coils in Class II, Division 2 locations?
They must be provided with dusttight enclosures
Which one of the following is NOT a suitable type of enclosure for motors, generators, and other rotating electrical equipment in Class II, Division 2 locations?
Totally enclosed water-air-cooled
Which one of the following is a requirement for resistors and resistance devices in hazardous locations?
They must be provided with enclosures identified for the location
Which type of enclosures are required for fixed lighting luminaires in hazardous locations?
Dusttight or otherwise identified for the location
What type of enclosures are permitted for switches, circuit breakers, and fuses in hazardous locations?
Explosionproof or dusttight
Which of the following is a requirement for surge arresters and surge-protective devices installed in hazardous locations?
They must comply with the requirements of 502.120(B)
What type of cable should be used for flexible connections in hazardous locations, where flexible cords shall comply with 502.140?
Flexible cord listed for hard usage
Which of the following is a requirement for flexible cords used in hazardous locations?
Contain an equipment grounding conductor complying with 400.23.
What type of receptacles are required in Class II, Division 1 locations?
Receptacles that are part of the premises wiring.
Which of the following is a requirement for enclosures containing contacts in Class II, Division 2 locations?
Enclosures must be of the general-purpose type.
What type of enclosures are required for resistors and similar equipment in Class II, Division 1 locations?
Enclosures that are explosionproof.
Which type of cable is required to include an equipment grounding conductor in addition to a drain wire?
Type TC-ER cable
Which one of the following is a requirement for grounding and bonding in hazardous locations?
Grounding and bonding shall be provided for all electrical equipment
Which type of cable should be used in restricted industrial establishments for applications limited to 600 volts nominal or less, where the cable is not subject to physical damage and is terminated with fittings listed for the location?
Type P cable
Which one of the following is NOT a requirement for uninsulated exposed parts in Class II, Divisions 1 and 2 locations?
The exposed parts shall be grounded
Which of the following types of machines are permitted to be installed in locations where accumulations of nonconductive, nonabrasive dust will be moderate and machines can be easily reached for routine cleaning and maintenance?
Standard open-type machines with such contacts, switching mechanisms, or resistance devices enclosed within dusttight housings without ventilating or other openings
What type of motors are permitted to be installed in Class II, Division 2 locations if the external surface temperatures, without a dust blanket, do not exceed the temperatures indicated under the maximum full-load (normal operation) conditions?
Totally enclosed motors
What type of luminaires are required in Class II, Division 1 locations for fixed and portable lighting?
Luminaires marked to indicate maximum lamp wattage
What is the requirement for pendant luminaires in hazardous locations?
They must be suspended by other approved means
Which of the following is NOT a requirement for wiring methods in Class III, Division 1 locations?
Intermediate metal conduit
Which of the following locations is NOT considered a Class III location according to the text?
Chemical processing plants
Which of the following is a requirement for equipment installed in Class III locations according to the text?
Ability to function at full rating without developing surface temperatures high enough to cause excessive carbonization
Which of the following is a suitable wiring method for Class III, Division 1 locations according to the text?
Dusttight wireways
Which of the following is a requirement for bonding in hazardous locations?
Bonding shall comply with Part I and Part V of Article 250
Which of the following is NOT a suitable means of bonding in hazardous locations?
Locknut-bushing contacts
Where should the specific bonding means be permitted to end in hazardous locations?
At the disconnecting means
Which one of the following is a requirement for wiring methods in Class I, Division 1 locations?
Wiring methods must be separated from each other
What type of enclosures are required for fixed lighting luminaires in hazardous locations?
Explosionproof enclosures
Which of the following is a requirement for surge arresters and surge-protective devices installed in hazardous locations?
Surge arresters must be installed in an enclosure
Which of the following is a requirement for liquidtight flexible metal conduit in hazardous locations?
It must have an equipment bonding jumper
Which type of enclosures are required for resistors and similar equipment in Class II, Division 1 locations?
Dusttight enclosures
Which of the following is a requirement for surge arresters and surge-protective devices installed in a Class II, Division 1 location?
They must be suitable for the location
Which one of the following is NOT a requirement for grounding and bonding in hazardous locations?
Grounding and bonding must comply with 503.30(B)(2)(a) and (B)(2)(b)
Which of the following is a requirement for the installation of intrinsically safe apparatus and associated apparatus?
They must be listed
What is the purpose of the control drawing(s) in the installation of intrinsically safe apparatus and associated apparatus?
To provide limitations on cables and circuit separation
Where can intrinsically safe apparatus be installed?
In any hazardous (classified) location
What is the requirement for enclosures of simple apparatus in hazardous locations?
They must have a maximum surface temperature of 150°C
Which of the following standards is used for construction and performance requirements for intrinsically safe (IS) systems in the United States?
ANSI/UL 913
What is the purpose of an acceptable ground detector in the power supply to contact conductors?
To give an alarm and automatically de-energize the contact conductors in case of a fault to ground
What is the purpose of current collectors in a system?
To confine normal sparking and prevent escape of sparks or hot particles
What type of enclosures are commonly used for associated apparatus installed in hazardous locations?
Explosionproof enclosures
Which one of the following is a requirement for portable lighting equipment in hazardous locations?
The equipment shall be equipped with handles and protected with substantial guards.
What is the requirement for flexible cords in Class III, Divisions 1 and 2 locations?
They must be of a type listed for extra-hard usage.
Which one of the following is a requirement for receptacles and attachment plugs in Class III, Division 1 and Division 2 locations?
They must be of the grounding type.
What is the requirement for electric cranes, hoists, and similar equipment in Class III, Divisions 1 and 2 locations?
They must comply with 503.155(A) through (D).
Which of the following is a requirement for separating intrinsically safe conductors from nonintrinsically safe conductors in raceways, cable trays, and cables?
By using Type MC cable, Type MI cable, or other approved grounded metal-sheathed or metal-clad cables
What is the purpose of physically and electrically separating non-IS circuits and IS circuits in an IS system?
To prevent unsafe energy from being introduced into the IS system by a wiring fault
Which of the following methods can be used to separate conductors of intrinsically safe circuits from conductors of nonintrinsically safe circuits within enclosures?
Use of approved restricted access wiring ducts separated from other wiring ducts by a minimum of 19 mm (3/4 in.)
What is the requirement for separating conductors and cables of intrinsically safe circuits from conductors and cables of nonintrinsically safe circuits when they run in other than raceway or cable tray systems?
Separation by at least 50 mm (2 in.) and secured
Which color is permitted to identify intrinsically safe conductors according to the text?
Light blue
What is the purpose of color coding in unclassified locations according to the text?
To indicate the presence of intrinsically safe conductors
Why is identification necessary in unclassified locations according to the text?
To prevent the addition of nonintrinsically safe wire
Which of the following is a requirement for the installation of intrinsically safe apparatus and associated apparatus?
Intrinsically safe apparatus, enclosures, and raceways must be connected to the equipment grounding conductor
What is the purpose of the control drawing(s) in the installation of intrinsically safe apparatus and associated apparatus?
To provide a safeguard against inadvertent connection between adjacent terminals
Which of the following is a requirement for surge arresters and surge-protective devices installed in hazardous locations?
They must be connected to the equipment grounding conductor
Which of the following is a requirement for grounding electrode connections for zener diode barriers in hazardous locations?
They must comply with 250.30(A)(4)
What is the purpose of maintaining a low-impedance path to ground for zener diode barrier systems?
To prevent fault currents from shunting to ground
Which of the following electrodes is required to be used for grounding electrode connections in hazardous locations?
Metal underground water pipes
What is the requirement for sealing conduits and cables in hazardous locations?
They must be identified for the purpose of minimizing passage of gases, vapors, or dusts
Test your knowledge on bonding requirements in Class II, Division 2 locations. Learn about the conditions where a bonding jumper may not be required, such as using listed liquidtight flexible metal conduit, limited overcurrent protection, and specific load types.
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