NFPA 496 2013

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NFPA 496: Standard for Purged and Pressurized Enclosures for Electrical Equipment

Published By	Publication Date	Number of Pages
NFPA	2013	30

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Category: NFPA

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Description

Protect electrical equipment in flammable atmospheres by following the latest protection techniques outlined in the 2013 NFPA 496. NFPA 496: Standard for 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

PDF Catalog

PDF Pages	PDF Title
2	Important Notices and Disclaimers
3	Additional Notices and Disclaimers
4	2.1 General 2.2 NFPA Publications
8	Chapter 1 Administration 1.1 Scope 1.2 Purpose 1.3 Application 1.4 Equivalency 1.5 Units of Measurement 1.6 Mandatory Rules, Permissive Rules, and Explanatory Material Chapter 2 Referenced Publications
9	2.3 Other Publications 2.4 References for Extracts in Mandatory Sections Chapter 3 Definitions 3.1 General 3.2 NFPA Official Definitions 3.3 General Definitions
10	3.4 NEC Extracted Definitions Chapter 4 General Requirements for Pressurized Enclosures 4.1 Applicability 4.2 Suitability of Identified Equipment
11	4.3 Enclosure 4.4 Pressurizing System 4.5 Protective Gas System 4.6 Determination of Temperature Marking 4.7 Ventilated Equipment 4.8 Power Equipment
12	4.9 Type Z Pressurizing 4.10 Type Y Pressurizing 4.11 Type X Pressurizing
13	4.12 Markings Chapter 5 Pressurized Enclosures for Class I 5.1 Applicability 5.2 General Requirements
14	5.3 Markings 5.4 Additional Requirements for Type Y or Type Z Pressurizing 5.5 Additional Requirements for Type X Pressurizing Chapter 6 Pressurized Enclosures for Class II 6.1 Applicability 6.2 General Requirements 6.3 Markings 6.4 Marking Information 6.5 Additional Requirements for Type X Pressurizing 6.6 Additional Requirements for Ventilated Equipment Chapter 7 Pressurized Control Rooms 7.1 Applicability 7.2 Protective Gas
15	7.3 Considerations Relating to Positive Pressure Ventilation 7.4 Requirements for Positive Pressure Air Systems Chapter 8 Pressurized Enclosures Having an Internal Source of Flammable Gas or Vapor 8.1 Applicability 8.2 General Requirements
16	8.3 Specific Requirements
17	Chapter 9 Pressurized Analyzer Rooms Containing a Source of Flammable Gas, Vapor, or Liquid 9.1 Applicability 9.2 General 9.3 Specific Requirements
18	Annex A Explanatory Material
22	Annex B Informational References
23	Index
25	Formal Interpretation