Codes & Standards - Purchase

CAN/CSA-E79-2-95 (R1999)

Electrical Apparatus for Explosive Gas Atmospheres - Part 2: Electrical Apparatus - Type of Protection "p" (Adopted IEC 79-2:1983, third edition)

SKU: 2410386 Published by CSA Group Publication Year 1995 Reaffirmed in 1999 58 pages Withdrawn

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Preface/Scope

Scope

SECTION ONE - GENERAL

In this section, recommendations and protective measures are set down which apply generally to each of the techniques coming under the concept type of protection p.

Note: Rooms or buildings protected by pressurization as well as analyzer houses are not included herein as they are the subject of separate reports.

SECTION TWO - ELECTRICAL APPARATUS HAVING NO INTERNAL SOURCE OF FLAMMABLE GAS OR VAPOUR

This section covers the internal pressurization technique particular to electrical apparatus having no internal source of flammable gas or vapour.

SECTION THREE - ELECTRICAL APPARATUS HAVING AN INTERNAL SOURCE OF FLAMMABLE GAS OR VAPOUR

This section covers the pressurization and dilution techniques applicabl e to electrical apparatus having an internal source of flammable gas or vapour.

The recommendations of this section apply both to continuous dilution with air and to pressurization with an inert gas.

Notes:
(1) In the event of a release, it is necessary to consider the possible effect on the atmosphere external to the apparatus.
(2) The report does not cover the situation where the release of flammable gas contains some oxygen. /

Domaine d'application

SECTION UN - GÉNÉRALITÉS

Dans cette section sont précisées les recommandations et les mesures de sécurité applicables, de façon générale, à toutes les techniques relevant du mode de protection «p».

Note. Les salles ou les bâtiments protégés par surpression interne ainsi que les bâtiments pour analyseurs ne sont pas concernés car ils font l'objet de rapports séparés.

SECTION DEUX - MATÉRIEL ÉLECTRIQUE SANS SOURCE INTERNE DE GAZ OU DE VAPEURS INFLAMMABLES

Cette section concerne la technique de surpression interne particul ière aux matériels électriques n'ayant pas de source interne de gaz ou de vapeurs inflammables.

SECTION TROIS - MATÉRIEL ÉLECTRIQUE AVEC SOURCE INTERNE DE GAZ OU DE VAPEURS INFLAMMABLES

Cette section concerne les techniques de surpression interne et de dilution applicables aux matériels électriques ayant une source interne de gaz ou de vapeurs inflammables.

Les recommandations de cette section s'appliquent à la fois à la dilution continue avec de l'air et à la surpression interne avec un gaz inerte.

Notes :
(1) En cas de dégagement, il convient de prendre en considération l'incidence possible sur l'atmosphère extérieure au matériel.
(2) Le rapport ne traite pas des cas où le dégagement de gaz inflammable contient une proportion d'oxygène.

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CAN/CSA-E79-2-95 (R1999)

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