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    • CAN/CSA-E79-5-95 (R1999)

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    CAN/CSA-E79-5-95 (R1999)

    Electrical Apparatus for Explosive Gas Atmospheres - Part 5: Sand-Filled Apparatus (Adopted IEC 79-5:1967, first edition)| Matériel électrique pour atmosphères explosives gazeuses - Partie 5: Protection par remplissage pulvérulent (norme CEI 79-5:1967 adoptée, première édition)
    SKU: 2410387 Published by CSA Group Publication Year 1995 Reaffirmed in 1999 33 pages Withdrawn

    Product Details

    • Preface/Scope
    1. General

    1.1  Principle

    Protection of electrical apparatus by sand-filling is obtained by filling the enclosure with a material having the consistency of sand, in such a way that if, under the conditions of use for which the apparatus has been designed, an arc occurs within the enclosure, this arc will not be liable to ignite the outer explosive atmosphere. No ignition should be caused either by the transmission of flame or by the overheating of the walls of the e nclosure.

    1.2  Object

    The object of this Recommendation is to prescribe:
    (1) The constructional requirements to be met by:
    (a) enclosures of electrical apparatus;
    (b) filling materials.

    (2) The tests to be made to check compliance with these requirements.
    (3) The method of determining the minimum safety height.
    (4) The marking of enclosures.

    This Recommendation does not deal with the conditions of installation of apparatus nor with the precautions to be taken to ensure that it is used within the limits of voltage, power and short-circuit current for which it has been designed.

    This Recommendation does not specify any limit of temperature rise to take into account the danger of direct ignition of certain gases or vapours, arising from their contact with the outer surface of the enclosure and from its temperature.*.

    *The danger of ignition by hot surfaces is a common feature of all protection problems. It is under consideration.

    Scope

    The method of protection by sand-filling applies only to electrical apparatus, or parts thereof, which have no moving parts in direct contact with the filling material and which in addition comply with the relevant IEC Recommendations. /

    1. Généralités

    1.1  Principe

    La protection du matériel électrique par remplissage pulvérulent est réalisée par un remplissage de l'enveloppe avec un matériau à l'état pulvérulent de manière telle que si, dans les conditions d'emploi prévues à la construction, un arc jaillit à l'intérieur de l'enveloppe, il ne puisse provoquer l 'inflammation de l'atmosphère explosive extérieure. Il ne doit y avoir inflammation ni par propagation de la flamme, ni par échauffement excessif des parois de l'enveloppe.

    1.2  Objet

    La présente recommandation a pour objet de fixer:

    (1) Les conditions auxquelles doivent satisfaire à la construction:
    (a) les enveloppes du matériel électrique;
    (b) le matériau utilisé pour le remplissage.

    (2) Les essais destinés à vérifier que ces conditions sont remplies.
    (3) La méthode de détermination de la hauteur minimale de sécurité.
    (4) Les marques et indications à porter sur les enveloppes.

    Elle ne traite pas des conditions auxquelles l'installation doit satisfaire, ni des précautions à prendre pour que son utilisation demeure à l'intérieur des limites de tension, de puissance et de régime de court-circuit pour lesquelles le matériel est construit.

    Elle ne fixe pas les limites d'échauffement pour tenir compte du danger d'inflammation directe de certains gaz ou vapeurs au contact de la surface externe de l'enveloppe en raison de sa température*.

    *Le risque d'inflammation par les surfaces chaudes est commun à tous les modes de protection. Il est à l'étude.

    Domaine d'application

    Le mode de protection par remplissage pulvérulent ne peut s'appliquer qu'aux matériels ou parties de matériel électrique ne comportant pas de pièces mobiles au contact direct du matériau de remplissage et satisfaisant par ailleurs aux recommandations de la CEI qui les concernent.
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