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DOE-HDBK-1092-2004
5.1.6.7.4
ELECTRICAL TESTING INSTRUMENTS FOR USE WITH NONINITIATING
ELECTRICAL CIRCUITS ......................................................................................5-12
5.2
PREVENTION OF EXTERNAL IGNITION AND EXPLOSION ................................................5-12
5.2.1
SOURCES OF IGNITION ..............................................................................................5-13
5.2.2
COMBUSTION PRINCIPLES ........................................................................................5-14
5.2.3
EVALUATION OF HAZARDOUS AREAS .....................................................................5-14
5.2.4
INTRINSICALLY SAFE EQUIPMENT ...........................................................................5-14
5.2.5
ENCLOSURES ..............................................................................................................5-14
5.2.6
PURGING/PRESSURIZATION SYSTEMS ...................................................................5-16
5.3
HAZARDOUS LOCATIONS.....................................................................................................5-17
5.3.1
CLASS I .........................................................................................................................5-17
5.3.1.1
DIVISION 1 ................................................................................................................5-17
5.3.1.2
DIVISION 2 ................................................................................................................5-21
5.3.2
CLASS II ........................................................................................................................5-21
5.3.2.1
CLASS II DIVISION 1 ................................................................................................5-21
5.3.2.2
CLASS II DIVISION 2 ................................................................................................5-23
5.3.3
GROUPS........................................................................................................................5-23
5.3.4
IGNITION TEMPERATURE...........................................................................................5-23
5.3.5
FLAMMABLE (EXPLOSION) LIMITS ............................................................................5-23
5.3.6
FLASHPOINT.................................................................................................................5-24
5.4
ELECTRICAL EQUIPMENT FOR CLASS I, II, AND III AREAS ..............................................5-24
5.4.1
SEALS AND DRAINS ....................................................................................................5-24
5.4.1.1
SEALS .......................................................................................................................5-24
5.4.1.2
DRAINS .....................................................................................................................5-25
5.4.1.3
SELECTION OF SEALS AND DRAINS ....................................................................5-25
5.4.1.3.1
PRIMARY CONSIDERATIONS.............................................................................5-25
5.4.1.3.2
TYPES OF SEALING FITTINGS...........................................................................5-26
5.5
MANUFACTURERS' DIGEST..................................................................................................5-26
5.6
DESCRIPTIONS, FEATURES, AND TEST CRITERIA OF ENCLOSURES FOR
HAZARDOUS (CLASSIFIED) LOCATIONS (PER NEMA 250)...............................................5-27
5.7
TYPE 7 ENCLOSURES ...........................................................................................................5-27
5.7.1
DESCRIPTION AND APPLICATION .............................................................................5-27
5.7.2
FEATURES AND TEST CRITERIA ...............................................................................5-28
5.8
TYPE 8 ENCLOSURES ...........................................................................................................5-28
5.8.1
DESCRIPTION AND APPLICATION .............................................................................5-28
5.8.2
FEATURES AND TEST CRITERIA ...............................................................................5-28
5.9
TYPE 9 ENCLOSURES ...........................................................................................................5-29
5.9.1
DESCRIPTION AND APPLICATION .............................................................................5-29
vii


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