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Only properly designed battery-operated, self-contained devices can be intrinsically safe by themselves. Other field devices and wiring are intrinsically safe only when employed in a properly designed IS system. Requirements for intrinsically safe electrical systems are given in the IEC 60079 series of standards.
Equipment has flameproof gaps (max 0.006" (150 μm) propane/ethylene, 0.004" (100 μm) acetylene/hydrogen) IEC/EN 60079-1 Zone 1 if gas group & temp. class correct Motors, lighting, junction boxes, electronics Increased safety e Equipment is very robust and components are made to a high quality: IEC/EN 60079-7 Zone 2 or Zone 1
This style devices are powered by battery, are easily activated while wearing gloves, and are intrinsically safe to operate in flammable or explosive atmospheres. It was reported that shortly after the events of September 11, 2001, the sound of many activated PASS devices could be heard beneath the rubble of the collapsed World Trade Center.
(Kletz originally used the term intrinsically safe in 1978, but as this had already been used for the special case of electronic equipment in potentially flammable atmospheres, only the term inherent was adopted. Intrinsic safety may be considered a special subset of inherent safety). In 2010 the American Institute of Chemical Engineers ...
Intrinsically Safe-High Power Trunk/High Power Intrinsically Safe Trunk (HPIST) The High Power IS Trunk (HPIST) technique provides an enhanced level of safety and simplicity in installation, along with the ability to use it for all devices (FISCO and Entity) and hazardous Zones and Divisions. It delivers approximately 350 mA of IS power to ...
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