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Protect electrical equipment in flammable atmospheres by following the protection techniques outlined in the 2008 NFPA 496.

NFPA 496: Purged and Pressurized Enclosures for Electrical Equipment contains requirements for the design and operation of purged and pressurized electrical equipment enclosures. This protection technique is used in Class I and Class II hazardous (classified) locations to reduce or prevent the presence of flammable materials within electrical equipment enclosures as specified by NFPA 70®: National Electrical Code®. NFPA 496 also includes chapters covering protection of analyzers and rooms housing analyzers as well as a chapter on pressurized control rooms.

Consistent with the 2008 NEC®, the 2008 NFPA 496 includes the following updates to help control fire hazards:

• A new requirement to mark purged and pressurized enclosures with an asphyxiation hazard warning where the protective gas is other than air
• Correlation with the NEC requirements on equipment temperature ratings

(Softbound, 22 pp., 2008)

NFPA 496 Standard for Purged and Pressurized Enclosures for Electrical Equipment 2008 Edition

Chapter 1 Administration

Chapter 2 Referenced Publications

Chapter 3 Definitions

Chapter 4 General Requirements for Pressurized Enclosures

Chapter 5 Pressurized Enclosures for Class I

Chapter 6 Pressurized Enclosures for Class II

Chapter 7 Pressurized Control Rooms

Chapter 8 Pressurized Enclosures Having an Internal Source of Flammable Gas or Vapor

Chapter 9 Pressurized Analyzer Rooms Containing a Source of Flammable Gas, Vapor, or Liquid

Annex A Explanatory Material

Annex B Informational References

Index

Formal Interpretation