EN 60079-2 PDF

Explosive atmospheres - Part Equipment protection by pressurized room "p" and artificially ventilated room "v" IEC E gives requirements for the design, construction, assessment, verification and marking of rooms used to protect internal equipment by pressurization or artificial ventilation or both as applicable when located in an explosive gas atmosphere or combustible dust atmosphere hazardous area with or without an internal source of a flammable gas or vapour. It also includes a room located in a non-hazardous area that has an internal source of release of a flammable gas or vapour. This document deals with rooms that are partially constructed in a manufacturer s facility and intended to have the final installation completed on-site, as well as rooms that are constructed completely on-site. Rooms partially constructed in a manufacturer s facility may include third-party verification.

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The only drawback of Pressurisation is that it requires a supply of protective gas, usually air, to purge the enclosure and keep it pressurised. The supply of purging and pressurising air is managed by a special control unit. One advantage of purging and pressurising is that this protection concept also accommodates possible internal releases of flammable gas, vapour or liquid.

This is relevant for analysers or other equipment that have a flammable liquid or gases passing through it. Important Design Parameters Strength of the enclosure. The enclosure must be able to withstand 1. The enclosure must be purged before the electrical equipment is energized. Shut-down or alarm in the event of the flow of the protective gas or the overpressure failing.

Applications Electrical equipment whose normal operation involves sparks, arcing, or hot components and complex industrial standard equipment controllers whose protection type enables them to be operated in hazardous areas. Large machines, slip ring or collector motors, switchgear and control gear cabinets, and analysis devices.

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