Abstract
Carcasses of electrical or non-electrical equipment operating in potentially explosive atmospheres must provide a certain degree of protection against access to hazardous parts, penetration of solid bodies and/or water penetration, which must be tested according to the specifications of the Ex protection types. Normal protection classes are indicated by the international IP code followed by two characteristic digits referring to the protection against penetration of solid foreign bodies and water protection, followed by optional letters if required by the beneficiary according to the imposed conditions of use. Within the ENExEMEIP laboratory, have been developed laboratory tests to verify the first characteristic figure of the standard degree of protection according to the standardized European method. In the paper is presented the test stand of the large gauge equipment, a stand made with state-of-the-art equipment that provides the necessary performance for the accreditation of the test according to the standardized requirements. Checking dustproof protection to equipment used in areas where explosive atmospheres generated by combustion dust may occur is particularly important for assessing compliance with the requirements of the ATEX Directive [5], as this protection is a basic requirement for explosion protection.
Highlights
In industrial areas that process combustible substance may occur under normal working conditions due to accidental processes or spills, explosive mixtures of gases, vapours, mists, flammable liquids and / or combustible dusts and air
To prevent the risk of explosion and / or fire, the essential security requirements are oriented in two directions [1, 2, 3]: - preventing the formation of explosive atmospheres of gases, vapours, flammable liquids and / or combustible dust, and keeping its contents mixed with air below the limit value considered as non-hazardous. - the limitation of ignition sources by the use of equipment and installations in which all electrical parts capable of producing sparks, springs or all parts having a temperature above the ignition temperature of the dust are protected or totally enclosed in caps or have electrical circuits limited
This goal is achieved by meeting the requirements for avoiding or reducing the amount of explosive atmosphere by controlling process parameters and by designing and constructing equipment, protection systems and their components
Summary
In industrial areas that process combustible substance may occur under normal working conditions due to accidental processes or spills, explosive mixtures of gases, vapours, mists, flammable liquids and / or combustible dusts and air. - the limitation of ignition sources by the use of equipment and installations in which all electrical parts capable of producing sparks, springs or all parts having a temperature above the ignition temperature of the dust are protected or totally enclosed in caps or have electrical circuits limited. This goal is achieved by meeting the requirements for avoiding or reducing the amount of explosive atmosphere by controlling process parameters and by designing and constructing equipment, protection systems and their components. Protected against foreign solids with a 4 diameter of 1 mm and higher (fine tools, wires)
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