Automation Parts

STANDARDS AS 1668, AS 1359, BS 7349, BS 4999, BS 5000, IEC 34, IEC 72. GENERAL Western Electric Smoke Spill motors are designed to meet the requirements of Bitish and Australian Standards. AS 1668. 1 states that the objectives of Smoke Control are:         a) to vent smoke from the fir-affected compartment: and         b) to reduce the spread of smoke to fire isolated exits and other compartments.   In general Smoke Spimm motors are required to continue to operate driving extraction fans in a building, in the case of a fire. Usually these motors operate air circulation fans as part of the normal operation of the building, however if a fire occurs they must continue to operate for a period of time to extract smoke and\or dangerous fumes from the building and allow rescue services some assistance in rescuing any occupants still in the building. it is expected that hte fumes being extracted will be at high temperatures, well above normal ambients

The following tables and comments are an attempt to cross reference between different National standards for Hazardous Location Definitions. We note that there is a world wide trend towards IEC standards in the electrical industry and that even the American manufacturers are gearing up to produce products to IEC standards in IEC metric dimensions. COMPARISON OF ZONES FOR ELECTRICAL EQUIPMENT IEC/CENELEC/U.K. GERMANY/JAPAN U.S.A. ZONE 0 DIVISION 1 ZONE 1 DIVISION 1 ZONE 2 DIVISION 2 COMPARISON OF CLASS II CLASSIFICATIONS - DUSTS B.S.6467 & A.S. 2236 -CLASS II U.S.A.-CLASS II DIP - NO SUB - GROUP GROUP E - METAL DUSTS GROUP F - COAL DUSTS GROUP G - GRAIN DUSTS COMPARISON OF GAS GROUPINGS FOR ELECTRICAL EQUIPMENT IEC CENELEC AUSTRALIA U.KBS4683 GERMANY & JAPAN VDEO171 RIIS-TR-TR-79-1 U.S.A. NATIONAL ELECTRIC CODE Representative Gases II IIA II IIA 1 D Propane IIB IIB 2 C Ethylene IIB IIC 3n 3a B Hydrogen IIB 3b