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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 ...