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Preface

This Publication has been prepared by Sub-Committee 31B, Sand- filled Apparatus, of IEC Technical Committee No. 31, Electrical Apparatus for Explosive Atmospheres.

It forms the first Supplement to IEC Publication 79-5 and gives the text of Appendix C.

A first draft was discussed at the meeting held in Warsaw in 1964, as a result of which a final draft was submitted to the National Committees for approval under the Six Months' Rule in June 1967. /

Preface

La presente publication a ete etablie par le Sous-Comite 31B: Mat eriels a isolant pulverulent, du Comite d'Etudes No 31 de la CEI: Materiel electrique pour atmospheres explosives.

Elle forme le premier complement a la Publication 79-5 de la CEI et donne le texte de l'annexe C.

Un premier projet fut discute lors de la reunion tenue a Varsovie en 1964, a la suite de laquelle un projet definitif fut soumis a l'approbation des Comites nationaux suivant la Regle des Six Mois en juin 1967.