EZQ 20/4 E E Ex e - Maico fans

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PLANNINGINSTRUCTIONSEZQ 20/4 E E Ex ePrimary explosion protection measures prevent the creation and the spreading of a potentially explosive atmosphere. The following areexamples of measures that could be used for this purpose:■ Diluent ventilation■ Extraction■ The avoidance of combustible materialsSecondary explosion protection measures prevent the ignition of an explosive atmosphere. Ignition protection measures in both electricaland non-electrical resources are used for this purpose.Step 6:Which zones can the areas with explosive atmospheres be classified into?Page ...Areas at risk of explosion are sub-divided into Zones depending on the frequency and duration of explosive atmospheres. MAICO fans canbe used in Zones 1 and 2:■ Zone 1: An area where an explosive atmosphere consisting of a mixture of air and combustible gasses, vapours or mists can occur duringnormal operation.■ Zone 2: An area where an explosive atmosphere consisting of a mixture of air and combustible gases, vapours or mists normally doesn'toccur or only occurs short-term during normal operation.Step 7:Can the increased safety motor ignition protection type "e" be used?Page ...If the build-up of an explosive atmosphere cannot be prevented, the ignition of this explosive atmosphere is to be avoided. Possible sourcesof ignition are:■ Electrical equipment■ Static electricity■ Hot surfaces■ Mechanically generated sparks■ Flames and hot gasesElectrical equipment can have different levels of ignition protection. MAICO fan motors for areas at risk of explosion have the increasedsafety motor ignition protection type "e". This means that safety measures have been introduced at the motor to prevent the occurrence ofinadmissibly high temperatures or sparks.Step 8:Check present temperature class as well as air stream and ambient temperatures?Page ...The ignition temperature of a potentially explosive atmosphere is the lowest heated surface temperature at which ignition occurs. For thisreason, the maximum surface temperature of a piece of equipment (in the case of fans, this is the motor), must always be lower than theignition temperature of the explosive atmosphere in question.The temperature classes T1 to T6 define the maximum ignition temperature that a piece of equipment can be used at.MAICO fans are designed for use in different temperature classes, depending on the product type.Version: 17.12.2013 - MAICO VENTILATOREN, www.maico-fans.com - We are not responsible for mistakes or printing errors and retain theright to make technical modifications without giving prior noticePage 4
PLANNINGINSTRUCTIONSEZQ 20/4 E E Ex eStep 9:Fan layoutPage ...There is a wide range of MAICO fans to choose from, based on the installation location and the point-of-use. There are fans for installation inducting systems as well as roof- and wall-mounted fans. The available air stream volumes range from 300 m 3 /h up to 11,000 m/h.Step 10:Is the build up of a potentially explosive atmosphere prevented in an approved way?Page ...It is critical that you check whether there is still the threat of a build-up of a potentially explosive atmosphere, in spite of all the primary andsecondary explosion protection measures. If this is the case, tertiary explosion protection measures must be taken. These should be aimedat reducing the effects of an explosion to a non-dangerous level.■ Explosion-proof construction■ Release of pressure■ Suppression of explosionIntroductionLegal requirementsThe regulations relating to explosion protection in Germany and in other member states of the European Union have migrated from theprevious EC Ex framework directives 76/117/EWG ff to new EC directives. With this step, explosion protection has been completelyharmonised within the European body of legislation and national regulations and guidelines have been adjusted to meet the legal demandswithin the European Union.The new legal system governing European explosion protection is based on two EC directives:■ Directive 94/9/EC: This defines the duties of the manufacturer in terms of the quality requirements for electrical and non-electricalequipment as well as protection systems.■ Directive 1999/92/EC: This regulates the duties for the operator (employer) in terms of the minimum requirements for the improvement ofthe protection of the health and security of employees, who could be placed in danger by explosive atmospheres.Duties of the manufacturer:Basically, safety in areas at danger from explosion can only be guaranteed through close cooperation between all concerned parties(manufacturers, installers, operators, test personnel, regulatory bodies).The manufacturer analyses and evaluates the ignition risks of his equipment and assigns them to the device groups and categories assdefined in Directive 94/9/EC, Appendix 1.■ Explosion protected fans from MAICO correspond to Device Group II, Category 2 G and when installed correctly, meet the basic safetyand health requirements.Version: 17.12.2013 - MAICO VENTILATOREN, www.maico-fans.com - We are not responsible for mistakes or printing errors and retain theright to make technical modifications without giving prior noticePage 5
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EZQ 20/4 E E Ex e - Maico fans

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