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    • CAN/CSA-E79-1A-95 (R1999)

    Codes & Standards - Purchase

    CAN/CSA-E79-1A-95 (R1999)

    Electrical Apparatus for Explosive Gas Atmospheres - First Supplement to CAN/CSA-E79-1-95: Appendix D: Method of Test for Ascertainment of Maximum Experimental Safe Gap (Adopted IEC 79-1A:1975, first edition) | Matériel électrique pour atmosphères explosives gazeuses - Premier complément à la norme CAN/CSA-E79-1-95: Annexe D: Méthode d'essai pour la détermination de l'interstice expérimental maximal de sécurité (norme CEI 79-1A:1975 adoptée, première édition)
    SKU: 2410385 Published by CSA Group Publication Year 1995 Reaffirmed in 1999 24 pages Withdrawn

    Product Details

    • Preface/Scope
    Scope

    This method of test is intended for the measurement of the maximum experimental safe gaps for gas- or vapour-air mixtures under normal conditions of temperature* and pressure so as to permit the selection of the appropriate group of flameproof enclosures. The method does not take into account the possible effect s of obstacles on the safe gaps**.

    *An exception is made for substances with vapour pressures which are too low to permit mixtures of the required concentrations to be prepared at normal ambient temperatures. For these substances, a temperature 5 deg C above that needed to give the necessary vapour pressure is used.

    **The design of the test apparatus for safe gap determination, other than that used for selecting the appropriate group of enclosure for a particular gas, may require to be different to the one described in this appendix. For example, the volume of the enclosure, flange width, gas concentrations and the distance between the flanges and any external wall or obstruction may have to be varied. As the design will depend on the particular investigation which is to be undertaken, it is unpracticable  to recommend specific design requirements, but for most application s the general principles and precautions indicated in the clauses of this publication will still apply. 

    Domaine d'application

    La présente méthode d'essai est destinée à mesurer les interstices expérimentaux maximaux de sécurité pour les mélanges gaz-air et vapeur-air dans les conditions normales de température* et de pression de façon à permettre le choix du groupe approprié d'enveloppes antidéflagrantes. La méthode ne tient pas compte des effets possibles des obstacles placés devant l es joints de sécurité.**

    *Exception est faite pour les substances dont les tensions de vapeur sont trop faibles pour permettre de préparer, aux tempér atures ambiantes normales, des mélanges aux concentrations voulues. Pour ces substances, on utilise une température dépassant de 5 deg C celle qu'il faudrait appliquer pour obtenir la tension de vapeur nécessaire.Il se peut que la conception de l'appareil d'essai, pour la détermination des interstices de sécurité autres que ceux destinés à permettre le choix du groupe approprié d'enveloppes antidéflagrantes pour un gaz particulier, doive être différente de celle prescrite dans cette annexe. Il peut être nécessaire de faire varier, par exemple, le volume de l'enveloppe, la largeur des brides, les concentrations de gaz, ainsi que la distance entre les brides et toute paroi externe ou obstruction. Comme la conception de l'appareil dépendra des recherches particulières à entreprendre, il est fort peu utile de recommander des exigences de construction particulières; toutefois, pour la plupart des applications, les précautions et les principes généraux indiqués dans les articles de la présente publication resteront applicables.
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