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An offshore platform has smoke detectors installed in the accommodation module. The smoke detectors are intrinsically safe (IS) & wired back to the F&G system without an IS barrier installed in the loop. Note - the smoke detectors are installed in a non hazardous area. Has anyone come across a similar type of installation & why would an IS smoke detector be installed in a non hazardous area? Would an IS smoke detector installed in a non hazardous area without an IS barrier be considered an acceptable & compliant with industry standards?