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This study investigates experimentally the influence of dust thermal conductivity on the maximum surface temperature of Ex equipment operating under dust layer conditions at a fixed dissipated power of 3 W. Experiments were conducted using a purpose-built resistive test sample, designed and manufactured at INCD INSEMEX, tested with two dust materials representing boundary conditions of thermal behaviour: vermiculite, selected as a worst-case insulating material, and Portland cement dust, selected for its industria...

Technical equipment intended for use in potentially explosive atmospheres generated by the presence of combustible dusts is provided with enclosures that must be designed in such a way as to ensure protection against the ingress of solid bodies and/or dust, as well as water, a concept materialized by the notion of normal protection degree. or increase protection (international code IP). The expression of the normal degree of protection of the casing of a technical equipment is done through the group of letters IP ...