Area Electrical Classification and Hazardous Area Wiring

20 hours

This course provides a comprehensive working knowledge of the methods to classify areas and the associated approved wiring methods. It is intended for all levels of personnel from managers to crafts people. This course focuses on plant scale equipment and operations. It is intended for new and experienced personnel.

  1. Flammability Basics
    a. Flash points
    b. Autoignition temperatures
    c. Explosion types
    d. Explosive Limits
    e. Inerting
    f. Oxygen enriched atmospheres
    g. Classification of flammable and combustible liquids
  2. Class I Locations
    a. History of the code
    b. Overall definitions
    c. Class I locations
    d. Code examples
    e. Mitigating conditions
    f. Division 1 vs. Division 2
    g. Group determination
    h. T-Ratings
    i. IEC zone definitions
    j. Classes vs zones
    k. Class examples
    l. Guidance documents
    i. OSHA
    ii. NFPA-497
    iii. API-520
    iv. IEC
    m. Classification procedure
    n. Openings
    o. Ventilation
    p. Classification probabilities
    q. Miscellaneous issues
  3. Class II and III Locations
    a. Class II locations
    b. Class III locations
    c. Dust hazard overview
    d. Industry guidelines
    e. NFPA-654 guidelines
    f. Examples of dust hazards
    g. ISA Guidelines
    h. Guidance documents
    i. NFPA-499
    ii. ISA-12.10
    i. Discussion of specific problem areas
  4. Wiring Class I locations
    a. Approved wiring methods
    b. Enclosures
    c. Explosion proof wiring basics
    d. Conduit seals
    e. Seal requirements
    f. Process seals
    g. Flexible cords
    h. Equipment specifics
  5. Wiring Class II Locations
    a. Approved wiring methods
    b. Differences from Class I locations
    c. Enclosures
    d. Conduit seals
    e. Seal requirements
    f. Flexible cords
    g. Equipment specifics
  6. Other Wiring Methods
    a. Intrinsically safe wiring basics
    b. Non-Incendive wiring overview
  7. Purging and Pressurization
    a. Overview
    b. Pressurization requirements
    c. Implications for research operations
    d. Purged enclosure design considerations
    e. Control room design considerations
    f. Problem areas
  8. Maintenance and Inspection
    a. Inspection requirements
    b. Things to look out for
    c. Common maintenance issues
  9. References
  10. Q&A