Explosion-proof certification is used to determine whether the Equipment meets the requirements of explosion-proof standards, type 0 test, and adaptation of routine tests and issue the relevant certificate of conformity. Certificates can be for Ex devices or Ex components.
Equipment and protection systems used in explosive gas environments must comply with several regulations, standards, and directives before entering the global trade market.
National explosion-proof certification standards:
1. Eu ATEX certification, using EN standard
The ATEX Directive 2014/34/EU regulates equipment and protection systems used in potentially explosive environments, a compulsory regulation between EU Member States. Hazardous sites or explosion-proof Equipment intended for installation in the EU must comply with ATEX Directive 2014/34/EU. The ATEX directive ensures the free movement of goods throughout the EU by harmonizing compliance procedures. Once the product has passed the directive and obtained the conformity certification, it can be affixed with the CE mark and Ex mark pattern.
2. IECEX certification of International Electrotechnical Commission adopts IEC standard
IECEx certification is the purpose of establishing an explosion-proof products international certification system. Explosion-proof products in the audit have a unified standard, certificate, and mark, and through the multi-country transfer mechanism, so that in line with the specification of the products can quickly enter the market and promote international trade. Under the IECEx system, only accredited certification bodies (EXCBs) and testing laboratories (EXTLs) are accepted for system certification.
3. The Commonwealth of Independent States
(Russia, Belarus, Kazakhstan, Kyrgyzstan) CU – TR certification, adopted standards and IEC similar customs union certification (CustomUnionTechnicalRegulationCertification), also known as the customs union specification authentication, the authentication marks for EAC; therefore, it is called CU-TR authentication or EAC authentication in English. As of 15 February 2013, an EAC(Eurasian Compliance)Ex certification is required in order to gain access to the Customs Union for products in dangerous places (Russia, Belarus, Kazakhstan, Armenia, and Kyrgyzstan). The EACEx certificate indicates compliance with the Technical regulation TPTC012/2011 “Explosion-proof Equipment Safety Technical Specification Directive” of the Customs Union.
4. North America (US and Canada)
North American local, such as UL, FM, and other explosion-proof certifications, mainly adopt NEC local standards.
5. China’s explosion-proof certification adopts GB3836 standard
According to the Standardization Law of the People’s Republic of China, all explosion-proof standards are mandatory standards and must be enforced. Explosion-proof products used in China (including imports) must be certified by designated explosion-proof inspection institutions. Explosion-proof inspection and certification bodies in accordance with the Chinese standard GB3836 series for explosion-proof motors, explosion-proof electrical, explosion-proof lamps and lanterns, explosion-proof instruments, and meters, explosion-proof communication equipment, explosion-proof transport vehicles and explosion-proof mechanical Equipment and other explosion-proof performance review and testing, issued explosion-proof certificate. In addition to the GB3836 standard, the domestic coal safety certification also adopts China’s unique mining products industry standard.
6. ECASEx in the UAE
ECASEx (EmiratesConformityAssessmentSystemEx) for the standardization of the united Arab emirates with the ESMA bureau of standard measurement (EmiratesAuthorityForStandardization&Metrology) for potential use in explosive environment Mandatory certification of electrical equipment requirements. The ECASEx certificate is valid for one year.
7. INMETRO in Latin America
The INMETRO mark administered by audit organizations in Brazil is mandatory, and manufacturers are required to apply for INMETRO certification in accordance with the local decree Portaria179:2010, which regulates the use of Equipment in dangerous places.
8. China’s Taiwan Ts
Ministry of Labor of the Executive Yuan “entrusts Industrial Technology Research Institute of consortium legal person to carry out explosion-proof product type verification business, according to CNS3376 series of laws and regulations for explosion-proof products for testing, and issue an explosion-proof certificate. IECEx certificates and reports are also accepted to enter the Taiwan market by means of a sub-certificate.
9. ANZEx Australia
Australia (Australia and New Zealand) directly recognizes the IECEx certificate.
10. Japanese TIIS
Japan Industrial Safety Technology Association (TIIS) for the Japanese Ministry of Health, Labor and Welfare designated explosion-proof electrical equipment verification body. If you have an IEC60079 certification certificate, test report, and technical documents, apply for written examination, exemption from repeated tests, type verification certificate validity period is 3 years.
11. Korea KCs
If manufacturers have obtained an IECEx certificate, they can apply for a KC certificate with the certificate, test report, and technical documentation, or they may be exempted from repeated testing. There are currently three major organizations that issue KC certificates: KGS, KOSHA, and KTL. The certificate holder must be a company registered in South Korea.
12. Saudi SASO
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In Saudi Arabia, SASO standard organizations (SaudiArabianStandardsOrganization) are issued by the certification body authorized by the certificate of conformity (CoC) according to the IECEx certificate for access permissions in Saudi Arabia.
Explosion-proof certification classification:
The standards of explosion-proof electric Equipment are synchronized with the IEC. There are eight types of explosion-proof officially approved by the state, namely flameproof type (d), increased safety type (e), intrinsically safe type (i), positive pressure type (p), oil-filled type (o), sand-filled type (q), no spark type (n), pouring type (m). In addition, there are particular explosion-proof types and dust explosion-proof type two.
In automatic instrument equipment, the world is widely used in the first three, that is, flameproof type (d), increased safety type (e), and intrinsically safe type (i).
1. Flameproof electrical Equipment (d)
An electrical apparatus having a flameproof housing is an electrical apparatus in which the components that ignite an explosive mixture are enclosed in a housing that can withstand the fierce pressure of the internal flammable medicine and prevent the transmission of detonation to the surrounding explosive mixture.
2. Enhanced safety type Electrical Equipment (e)
Electrical Equipment which, under normal operating conditions, will not generate sparks or dangerous temperatures for igniting explosive mixtures and which is structurally enhanced by measures to avoid igniting under normal and prescribed overload conditions.
3. Intrinsically Safe Electrical Equipment (i)
Electrical Equipment in which explosive mixtures cannot be ignited by sparks or thermal effects during regular operation or under standard test conditions.
Intrinsically safe electrical Equipment and its associated Equipment are classified into IA and IB grades according to the use place and safety degree of inherently safe circuits.
Class IA: Electrical Equipment that fails to ignite explosive gas mixtures in regular operation, in one or two failures.
Class IB: Electrical Equipment that does not ignite explosive gas mixtures in regular operation or during a failure.
4. Positive pressure type electrical equipment (p)
Electrical Equipment with a protective shell filled with a protective gas whose pressure is kept higher than that of the surrounding explosive mixture gas to avoid external explosive mixture entering the inside of the surface.
5. Oil-filled Electrical Equipment (o)
Electrical Equipment in which all or some live parts are immersed in oil to prevent them from reaching an explosive mixture above the fuel level or around the housing.
6. Sand Filling type Electrical Equipment (q)
The enclosure is filled with particulate material so that, under specified service conditions, electric arcs generated within the chamber, flame propagation, overheating temperatures of the shell walls, or the surface of the particulate material cannot ignite the Electrical Equipment of the surrounding explosive mixture.
7. Casting and sealing type electrical equipment (m)
8. Sparkless Electrical Equipment (n)
Electrical Equipment that does not produce arc or spark under normal operating conditions, nor does it create high-temperature surface or hot point that can ignite explosive mixture around, and generally does not have ignition failure.
Explosion-proof special electrical Equipment (s)
When electrical Equipment or parts adopt explosion-proof types not included in GB3836-83, interim provisions shall be formulated by the competent authorities. Send to the Department of Labor and human resources for the record, and after the designated appraisal unit inspection, according to the particular electrical equipment “s” type treatment.
Dust explosion-proof type
In order to prevent explosive dust from entering the inside of the Equipment, the joint surface of the shell should be tightly fastened, the sealing washer should be added, and the rotating shaft and shaft should be.