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Questions and Answers
An atmosphere that contains a volatile gas during normal operation of the equipment would be considered a _____ location.
An atmosphere that contains a volatile gas during normal operation of the equipment would be considered a _____ location.
- Class I, Division 1 (correct)
- Class III, Division 1
- Class I, Division 2
- Class II, Division 1
A cabinet manufacturer has separate areas for woodworking and application of the final finishes. How would these areas be classified?
A cabinet manufacturer has separate areas for woodworking and application of the final finishes. How would these areas be classified?
- Class I for the finishing areas and Class III for the woodworking areas (correct)
- Class II for the entire plant
- Class I for the entire plant
- Class I for the finishing areas and Class II for the woodworking areas
An atmosphere that normally contains gasoline vapors would fall into Group _____.
An atmosphere that normally contains gasoline vapors would fall into Group _____.
- Group A
- Group C
- Group B
- Group D (correct)
Which of the following locations requires the use of a totally enclosed generator?
Which of the following locations requires the use of a totally enclosed generator?
Rigid metal conduit is acceptable in a Class I, Division 1 environment.
Rigid metal conduit is acceptable in a Class I, Division 1 environment.
One way to prevent explosions is to reduce the concentration of explosive vapor using appropriate ventilation.
One way to prevent explosions is to reduce the concentration of explosive vapor using appropriate ventilation.
When you are standing at a pump dispensing gasoline, you are located in a _____ area.
When you are standing at a pump dispensing gasoline, you are located in a _____ area.
All conduit systems running beneath a hazardous location are not considered hazardous as long as they are embedded in concrete.
All conduit systems running beneath a hazardous location are not considered hazardous as long as they are embedded in concrete.
Grounding is not required for the metal noncurrent-carrying parts of gasoline dispensers.
Grounding is not required for the metal noncurrent-carrying parts of gasoline dispensers.
The NEC® only contains requirements for equipment located within 5 feet above an airplane engine.
The NEC® only contains requirements for equipment located within 5 feet above an airplane engine.
Anesthetizing gas storage rooms are considered _____ locations.
Anesthetizing gas storage rooms are considered _____ locations.
The NEC® requirements for essential electrical systems in hospitals are covered in _____ .
The NEC® requirements for essential electrical systems in hospitals are covered in _____ .
Installations in petrochemical facilities are regulated by _____.
Installations in petrochemical facilities are regulated by _____.
As-built modifications to installations in petrochemical facilities are acceptable as long as the job superintendent has been informed.
As-built modifications to installations in petrochemical facilities are acceptable as long as the job superintendent has been informed.
Manufacturers' data for explosion-proof equipment is available _____ .
Manufacturers' data for explosion-proof equipment is available _____ .
All of the following are potential ignition sources, except _____.
All of the following are potential ignition sources, except _____.
Class I, Division 1, Group C fittings can be used for _____ locations.
Class I, Division 1, Group C fittings can be used for _____ locations.
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Study Notes
Hazardous Location Classifications
- Class I, Division 1 is designated for areas with volatile gases present during normal operations.
- Class I finishing areas contain volatile gases, while woodworking areas are classified as Class III due to easily ignitable fibers.
Groups of Hazardous Atmospheres
- Gasoline vapors present in an area classify it as Class I, Division 1, Group D.
Generator Requirements
- All classes of hazardous locations require the use of a totally enclosed generator to prevent ignition sources.
Equipment and Safety
- Rigid metal conduit is acceptable in Class I, Division 1 environments.
- Appropriate ventilation can help reduce explosive vapor concentrations to prevent explosions.
- Class I, Division 2 is applicable to locations like gasoline dispensing pumps.
Conduit and Grounding Safety Regulations
- Conduit systems beneath hazardous locations are considered hazardous if they have connections into those areas.
- Metal noncurrent-carrying parts of gasoline dispensers must be effectively grounded.
National Electrical Code (NEC) Regulations
- NEC requires arcing equipment below 10 feet from an airplane engine be totally enclosed to avoid spark hazards.
- The NEC specifies requirements for essential electrical systems in hospitals in Article 517, Part III.
Regulatory Oversight in Petrochemical Facilities
- Installations in petrochemical facilities are regulated by the NEC, state agencies, and local agencies.
- Changes to installations in petrochemical facilities must be resubmitted to all governing agencies.
Equipment Standards and Ignition Sources
- Manufacturers’ data for explosion-proof equipment can be obtained from local distributors, manufacturer representatives, or directly from factories.
- Portable aluminum tools do not spark upon impact and are therefore not considered ignition sources in hazardous locations.
Group C and D Fittings
- Class I, Division 1, Group C fittings can be used in locations classified as either Group C or Group D.
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