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This method is also recognized in division-classified areas. Because of the energy limits, this method can be used only with very low-power circuits - primarily instrumentation and signaling. The energy limits must be maintained under specified failure modes.
This protection technique shall be permitted for apparatus and associated apparatus in Class I, Zone 0, Zone 1, or Zone 2 locations for which it is listed. Because the ignition energy varies for different flammable gases and vapors, intrinsic safety equipment must be listed for the specific material and zone.
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