NF EN 50303

Group I, category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust

Le présent document définit les prescriptions de conception, de construction, d'essai et de marquage pour les appareils du groupe I, catégorie M1, prévus pour rester en fonctionnement dans les parties souterraines de mines, comme des parties d'installations de surface lorsque de telles mines sont mises en danger par le grisou et/ou de nuages de poussières de charbon dans des conditions atmosphériques normales de pressions s'étendant de 0,8 bar à 1,1 bar et des températures s'étendant de -20°C à +60°C.

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