Area Electrical Classification for Pilot Plants, Laboratories and Research Facilities

8 hours

This course focuses on problems encountered in trying to apply the National Electric Code in a research environment. The course assumes some familiarity with the code although a brief refresher is provided. It is intended for both new personnel, to acquaint them with the issues, and for experienced personnel, to suggest some potential solutions. Realistic, practical suggestions are provided that are applicable in a research environment.

1. Basic Principles Refresher
   a. Flash point
   b. Autoignition temperature
   c. Explosive limits
2. Area Electrical Classification Refresher
   a. Class I areas only
3. Common Codes and Standards
   a. How they address research concerns
4. Adequate Ventilation
   a. Definitions
   b. Issues
5. Laboratory Classification and Issues
   a. Hoods
   b. Benches
   c. Ventilated enclosures
   d. Laboratory pilot plants
6. Approvals for Equipment
   a. Use of IEC zone equipment
7. Heaters and Heat Tracing in Classified Areas
   a. Purging
   b. Limiting surface temperatures
   c. Purchased units
   d. Heat tracing
8. Process Seals
9. Flexible Connections
10. Combustible Gas Detection
    a. how it affects area electrical classification
11. Purging and Pressurization