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Xycom 9465 PC/AT Manual
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Chapter 3 – Installation3-33Division 2 Locations• Class I volatile flammable liquids or flammable gasses are handled, processed, orused, but confined within closed containers or closed systems from which they canescape only in cases of accidental rupture or breakdown of such enclosures or sys-tems, or in case of abnormal operation of equipment.• Ignitable concentrations of Class I vapors or gasses are normally prevented by posi-tive mechanical ventilation, but which may become hazardous due to mechanicalfailure of those ventilation systems.• Location is adjacent to a Division 1 location.• Class II combustible dust is not normally in the air in quantities sufficient to produceexplosive or ignitable mixtures. Dust accumulations are normally insufficient to in-terfere with normal operation of electrical equipment or other apparatus. Combusti-ble dust may be in suspension in the air as a result of the following: infrequent mal-functioning of handling or processing equipment; combustible dust accumulationson, or in the vicinity of electrical equipment; may be ignitable by abnormal operationor failure of electrical equipment.GroupsAll electrical equipment that is approved for use in hazardous locations must include agroup rating. Various flammable and combustible substances are divided into thesegroups as a function of their individual maximum experimental safe gap (MESG), explo-sion pressure, and ignition temperature.Component temperatures and the potential for spark based upon voltage, current, andcircuit characteristics, within electrical equipment, will determine what the equipmentgroup rating will be. A device approved for installation within Class I, Group A locationsmay also be used in Groups B, C, or D.NoteApproved Class I equipment may not be suitable for Class II installa-tions. Class I includes Groups A, B, C, and D. Class II includes GroupsF, and G.Power SwitchThe systems do not have a power switch. The amount of input power required by thesesystems classifies a power switch as an incendiary device because the voltage and cur-rent across the make/break device are capable of creating a spark.Hazardous locations’ regulations require that a power switch rated for ordinary locationsmay be used if it is located in an area specified as non-hazardous. However, limits in ca-ble length between the workstation and the power switch may apply. Otherwise theswitch must be compliant with Class I, Division 1 requirements (intrinsically safe).These switches are built in a manner that prevents the possibility of a spark when con-tacts are made or broken.Use suitable UL listed and/or CSA Certified Class I, Division 1 switches in hazardouslocations. These switches are available from a wide number of sources. It is the respon-Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com |
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