Electrical apparatus for flammable atmospheres: intrinsic safety

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Abstract
In a previous article, protection of electrical apparatus by flameproof enclosures was considered. Protection in this context means that, due to its method of enclosure, the apparatus will not cause ignition of a surrounding explosive atmosphere. However, with very low power apparatus such as for instrumentation and process data management, the type of protection known as intrinsic safety is usually more appropriate. Intrinsic safety is defined as a protection technique based on the restriction of electrical energy to a level which is too low to be able to ignite an explosive atmosphere. The following article describes some of the principles involved

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