ATEX, IECEx, NEC Explosion Protection Product Design

Explosionproof | Intrinsic Safety | Encapsulation | Increased Safety

Our team at Ex Dynamics have vast experience of hazardous area certification and how to design products for explosive atmospheres. We can assist in all aspects of your project, from initial feasibility study, through to full hazardous area product design. We also work as consultants, to help clients enter the complex Explosion Protection market and advise on what is required for ATEX or IECEx Certification.

We have extensive knowledge of ATEX, IECEx and North American (NEC) explosion protected equipment and protective systems. Utilising established relationships with certification bodies, we can quickly develop world beating products, using the most efficient path. Our experience means, for example, we know how to design flameproof enclosures or the best way to design Intrinsically Safe circuits. These, along with knowing how to use other ATEX, IECEx and NEC protection concepts, allows us to design products on time and on budget.

Hazardous Area Product Design Services

Hazardous Area Classifications

Hazardous areas are classified depending on the risk of an explosive substance being present. The classification is defined differently depending on the region and standards used. North America and Canada use both Class, Division and Class, Zone based systems whereas regions working with IECEx or ATEX use a Zone classification.

Class, DivisionAEx ZoneATEX/IECExDefinition
Class I, Div 1Class I, Zone 0Zone 0Presence of an explosive gas atmosphere continuously, frequently or for extended periods
Class I, Zone 1Zone 1Occasional presence of an explosive gas atmosphere under normal operation
Class I, Div 2Class I, Zone 2Zone 2An explosive gas atmosphere is unlikely to occur in normal operation and if it does, disperses quickly
Class II, Div 1Zone 20Zone 20Presence of an explosive cloud of dust in air continuously, frequently or for extended periods
Zone 21Zone 21Occasional presence of an explosive cloud of dust in air under normal operation
Class II, Div 2Zone 22Zone 22An explosive cloud of dust in air is unlikely to occur in normal operation and if it does, disperses quickly
Class III, Div 1--Ignitable fibres and flyings present continuously or under normal operation
Class III, Div 2--Presence of ignitable fibres and flyings is not likely under normal operation

Hazardous Area Protection Concepts

Protection concepts are chosen at the outset when designing a hazardous area product since it must be independently tested and certified prior to product sale to ensure safety. Each protection concept has its own advantages and drawbacks depending on the product type, area classification and region. To complicate matters further, even though some of the protection concepts behind hazardous area design are common between regions, the requirements can vary. Ex Dynamics have experience of working through these differences to deliver our customers products with universal global certification.

Ex StandardProtection Concept
EN/IEC/UL 60079-0General requirements for apparatus used in explosive atmospheres
EN/IEC/UL 60079-1Equipment protection by flameproof enclosures ‘d’
EN/IEC/UL 60079-2Equipment protection by pressurised enclosure ‘p’
EN/IEC/UL 60079-5Equipment protection by powder filling ‘q’
EN/IEC/UL 60079-6Equipment protection by liquid immersion ‘o’
EN/IEC/UL 60079-7Equipment protection by increased safety ‘e’
EN/IEC/UL 60079-11Equipment protection by intrinsic safety ‘i’
EN/IEC/UL 60079-15Equipment protection by restricted breathing ‘nR’ and sealed devices ‘nC’
EN/IEC/UL 60079-18Equipment protection by encapsulation ‘m’
EN/IEC/UL 60079-28Protection of equipment and transmission systems using optical radiation
EN/IEC/UL 60079-31Equipment dust ignition protection by enclosure ‘t’
EN/IEC/UL 60079-33Equipment protection by special protection 's'
ISO/UL 80079-37Non-electrical equipment – protection by constructional safety ‘c’, control of ignition sources ‘b’ and liquid immersion ‘k’

Working to the 60079 series of standards gives access to European and other markets working to the IECEx scheme, but to access North American Class, Div markets, other standards and approvals must be included in the scope.

USA StandardCanadian StandardProtection Concept
FM 3600CSA C22.2 No. 0General requirements for equipment for use in hazardous locations
FM 3610
CSA C22.2 No. 60079-11Intrinsic safety equipment
ANSI/UL 1203
FM 3615
CSA C22.2 No. 30Explosion-proof electrical equipment
ANSI/UL 1203
FM 3616
CSA C22.2 No. 25Dust-ignition-proof electrical equipment
ANSI/UL 121201
FM 3611
CSA C22.2 No. 213Nonincendive electrical equipment
FM 3620
ANSI/NFPA 496Purged and pressurized enclosures
Hazardous Area Certification Regions

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