Electrical Equipment in Class I Locations
Electrical equipment and wiring in locations classified as Class I, based on the likelihood that flammable concentrations of vapors or gases can occur, must be protected so they cannot cause ignition of the flammable gases or vapors. Ignition can occur from an arc, from a contact or wiring failure, or by the hot surface of a motor, lighting fixture, or heater. Protection of electrical equipment and wiring does not prevent ignition from other spark sources, for instance welding, static electricity, lightning, or cutting, or from other hot surfaces, for instance, steam lines, gas heaters, or open flames at burners. Other codes, standards, and safe working practices provide the safeguards for these hazards. The criteria for protection is found in Articles 501–1 through 501–17 of the NEC.
KeywordsElectrical Equipment Process Fluid National Electrical Manufacture Association Push Button Hazardous Location
Unable to display preview. Download preview PDF.
- Angehrn, J., W. Short, and W.O.E. Korver. 1975. Design and Construction Guide-lines for Electrical Systems in Hazardous Locations. Electrical Construction and Maintenance (Nov.):75–82.Google Scholar
- Bossert, J., and R. Hurst. 1986. Hazardous Locations: A Guide for the Design, Construction and Installation of Electrical Equipment. Rexdale, Ontario: Canadian Standards Association.Google Scholar
- Crouse Hinds Electrical Construction Materials. 1990 Code Digest. Syracuse, N.Y.Google Scholar
- Magison, C. 1978. Electrical Instruments in Hazardous Locations. Instrument Society of America, 3d ed. rev.Google Scholar