W/D S/S BY ISA TR12.12.04
Introduction
When electrical equipment is used in locations in which fire orexplosion hazards may exist due to flammable gases or vapors,flammable liquids, combustible dust, or ignitible fibers orflyings, the National Electrical Code (NEC), ANSI/NFPA 70 requiresspecial precautions to be taken in equipment construction andinstallation to minimize risks of fire and explosions. There areseveral protection techniques in common use, each of which has itsown set of advantages and disadvantages. Other countries, includingCanada, utilize varying wiring methods, so the contents of thisreport may not be applicable to countries other than the UnitedStates.
A location in which the fire or explosion hazard existsinfrequently and for short periods is designated as a Division2/Zone 2 location. One suitable protection technique for a Division2/Zone 2 location is “Nonincendive Equipment.” This TechnicalReport is intended to explain this protection technique and toclarify the associated terminology. Clarification of the term”Nonincendive Equipment” is very important since it has been usedin two different ways. This Technical Report also addresses fieldwiring for Division 2/Zone 2 locations.
The term “flammable material” will be used throughout thisTechnical Report to refer to any of the materials mentioned above,i.e., flammable gases or vapors, flammable liquids, combustibledusts, or ignitible fibers or flyings. Similarly, the termhazardous location will be used in place of the phrase hazardous(classified) location used in the NEC. Finally, although flammablematerials pose a fire hazard, the primary concern is anexplosion.
- Edition:
- 99
- Published:
- 01/01/1999
- ANSI:
- ANSI Approved
- Number of Pages:
- 18
- File Size:
- 1 file , 180 KB
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