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S EB NEC-2008

I A E IR,

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S E

C 2005, 2007

I A E I

90 W W, S 602R, X 75080-7702

A v. F E 2005

P U S A

0 09 08 07 5 3 2

ISBN: -890659-6-0

P in situ . U IAEI .

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Notice to the Reader

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2008 NFPA 70, National Electrical Code.1

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.he publishers make no representations or warranties o any kind, including,

but not limited to, the implied warranties o itness or particular purpose,

merchantability or non-inringement, nor are any such representations implied

with respect to such material. he publishers shall not be liable or any special,

incidental, consequential or exemplary damages resulting, in whole or in part, rom

the readers uses o or reliance upon this material.

National Electrical Code NEC N F P A, I., Q, MA 02269

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Beore installing

electricity and

equipment, know

the hazardous

area classifcation.

Beore installing

electricity and

equipment, know

the hazardous

area classifcation.

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Introduction and History ..................................................................9

1. Classifcation o Areas and Locations.......................................14

2. Methods o Protection ................................................................36

3. Protection Techniques or Hazardous Locations ....................70

4. Equipment in Hazardous (Classifed) Locations ...................102

5. Wiring Requirements ..............................................................126

6. Requirements or Special Occupancies ...................................162

Annex ..............................................................................................205

Large background photo courtesy of Thomas and Betts

T A B L E O F

CONTENTS

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Introduction and History

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History and Timeline

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1920s1930s

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1931

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1935

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1937

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1947

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Code. C v

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III IV C III .

1960

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1969

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A

v v NEC.

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1970s

UL Research Bulletins 58A 58B. T

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30 v W

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v NEC978.

1983

T N F P A

NFPA 97M, Classifcation o Gases, Vapors and Dusts or

Electrical Equipment in Hazardous (Classifed) Locations.

NFPA S 97M z

W E Photo 2. Westerberg Explosion Test Vessel (inside view)Courtesy of Underwriters Laboratories Inc.

Photo 1. Westerberg Explosion Test Vessel (WETV)Courtesy of Underwriters Laboratories Inc.

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