Certification marks and hazardous-area classifications: cross-market equivalences

Which product-safety certification mark applies in which market, who administers it and under what law (CE, UL, CSA, CCC, PSE, KC, BSMI, RCM, EAC, NOM, INMETRO and others), and how the two hazardous-area classification systems map onto each other: NEC Class/Division designations against IEC/ATEX Zone designations, gas group cross-references (NEC Group A-D against IEC IIA-IIC), temperature-class mappings, and the protection-concept codes (Ex d, AEx e, intrinsic safety) with the US, Canadian and IEC standards behind each. Answers 'is a CB certificate accepted in the US', 'what is the ATEX equivalent of Class I Division 2', and 'which mark is compulsory in China' — questions where the honest answer is often that there is no direct equivalent, and saying so is the value.

Records200

Sources12

Verified2026-08-11

Review by2027-08-11

LicenceFactual compilation with source citations. Facts about which mark applies where and how classification systems map are taken with short attributed quotes linking back to the published guide or page. No standard text is reproduced.

9 records where two or more sources state different values. Both sides are reproduced on the record page, each with its own source and quote.

The data

Designation	Stated equivalent	Applies to	Governing standard / law	Market / system	Administered by	Mandatory / voluntary	Meaning
A	IIC	Acetylene
AEx maD	Zone 20		ISA 61241-18
S Mark				Argentina	IRAM	mandatory in Argentina
II 1D	Da	Zone 20, 21 & 22		ATEX
II 1G	Ga	Zone 0, 1 & 2		ATEX
II 2D	Db	Zone 21 & 22		ATEX
II 2G	Gb	Zone 1 & 2		ATEX
II 3D	Dc	Zone 22 only		ATEX
II 3G	Gc	Zone 2 only		ATEX
RCM				Australia	Standards Australia		consolidates the previously separate C-Tick, A-Tick and RCM marks, effective from March 2013
B	IIC (partially IIB+H₂)	Hydrogen, butadiene
INMETRO Mark		medical electrical equipment, ballasts and equipment used in hazardous locations		Brazil		mandatory in Brazil
C	IIB	Ethylene, ethyl ether
(DIP) A21	Division 1	Class II	CSA E61241-1-1	CA
Ex	Division 1 & 2	Class I	CSA 60079-0	CA
Ex d	Zone 1	Class I	CSA 60079-1	CA
Ex e	Zone 1	Class I	CSA E60079-7	CA
EX ia	Zone 0	Class I	CSA E60079-11	CA
Ex ib	Zone 1	Class I	CSA E60079-11	CA
Ex m	Zone 1	Class I	CSA E60079-18	CA
EX nA	Zone 2	Class I	CSA E60079-15	CA
Ex nC	Zone 2	Class I	CSA E60079-15	CA
Ex nL	Zone 2	Class I	CSA E60079-15	CA
Ex nR	Zone 2	Class I	CSA E60079-15	CA
EX o	Zone 1	Class I	CSA E60079-6	CA
Ex px	Zone 1	Class I	CSA E60079-2	CA
Ex py	Zone 1	Class I	CSA E60079-2	CA
Ex pz	Zone 2	Class I	CSA E60079-2	CA
Ex q	Zone 1	Class I	CSA E60079-5	CA
(IS)sources differ	Division 1	Class I	C22.2 No. 157	CA
(NI)	Division 2	Class I	C22.2 No. 213	CA
(PX)	Division 1	Class II	NFPA 496	CA
(PY)	Division 1	Class II	NFPA 496	CA
(PZ)	Division 2	Class II	NFPA 496	CA
Type Y	Division 1	Class I	NFPA 496	CA
Type Z	Division 2	Class I	NFPA 496	CA			Pressurized
(XP)	Division 1	Class I	C22.2 No. 30	CA
CAN/CSA-C22.2 No. 60335-1	IEC 60335-1			Canada
CSA Mark				Canada	Canadian Standards Association		identify products acceptable in either Canada (C suffix letter) and/or the USA (US suffix)
CB Scheme					IECEE		the world’s first international system for the mutual acceptance of product safety test reports and certificates for electrical and electronic equipment, devices, and components
CE Marking			Decision 768/2008				a manufacturer’s declaration that a product meets the applicable health, safety, and environmental requirements outlined in the appropriate European product legislation and has undergone the relevant conformity assessment procedure
Certification Body (CB) scheme							allows manufacturers who have been issued a CB test certificate by one National Certification Body (NCB) to obtain certification marks from other participating NCBs
CCC Mark				China		compulsory for any product used for commercial purposes in China	indicates compliance with Chinese laws and regulations
Class II	Zone 20/21/22						NEC separates dust into Class II (Groups E, F, G); IEC integrates dust into the same zone framework (Zone 20/21/22) with dust groups IIIA, IIIB, IIIC
Class III							NEC Class III (fibers/flyings) has no IEC equivalent
D	IIA	Methane, propane, gasoline
(DIP) A22	Division 2		CSA E61241-1-1
Division 1sources differ	Zone 1 (+ Zone 0)						Explosive atmosphere likely during normal operation (10–1000 hrs/yr)
Division 2sources differ	Zone 2						Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)
Dust-ignition-proof	Ex t (Dust protection by enclosure)		IEC 60079-31				Prevent dust ingress and limit surface temperature
CE marking				EU		compulsory for most products covered by the New Approach Directives
EMC Directive		Wired-only industrial sensors with no radio transmitter	2014/30/EU	EU
EN 300 328		2.4 GHz Wi-Fi and Bluetooth devices		EU			the primary standard for Article 3.2 radio spectrum compliance for 2.4 GHz Wi-Fi and Bluetooth devices
EN 62368-1	EN 60950-1			EU			covers Article 3.1(a) audio/video and IT equipment safety
Low Voltage Directive		mains-powered above 50V AC or 75V DC	2014/35/EU	EU
LVD		electrical equipment operating between 50–1000V AC	2014/35/EU	EU			Safety requirements for electrical equipment operating between 50–1000V AC
Machinery Directive		machines and mechanical equipment	2006/42/EC	EU			Safety requirements for machines and mechanical equipment
MDR		medical devices	2017/745	EU			Medical device regulation with strict clinical and documentation requirements
Radio Equipment Directive (RED)			Directive 2014/53/EU	EU			the governing framework for any radio-transmitting device placed on the EU market
RED		Radio equipment including Wi-Fi, Bluetooth, and cellular	2014/53/EU	EU			Radio equipment including Wi-Fi, Bluetooth, and cellular
A-deviation				Europe			Information that the provisions of an EN are in conflict with national regulation shall be included in an Annex to the European Standard, called A-deviation
CE marking			EU-Regulations or EU-Directives	Europe			indicates that a product is declared by the manufacturer as being in conformity with European Union harmonization legislation
EN 60335-1	IEC 60335-1			Europe			defines how appliances may comply with European directives, such as the low voltage directive
ENEC Mark				Europe			the mark used to denote compliance with the European Norm (EN) standards for all electrical product sectors
EU Declaration of Conformity (EU-DoC)			ISO/IEC 17050-1 and -2	Europe			the EU legislation imposes an obligation on the manufacturer to draw up and sign a legally binding EU Declaration of Conformity (EU-DoC) before placing the product on the market
European Standard (EN)				Europe	CENELEC		A-deviations do not release CENELEC members from their obligation to implement the relevant European Standard
Notified Body				Europe			For some categories of products, involvement of a third-party conformity assessment body is necessary
CE Mark				European Economic Area		Simple CE marking is allowed under a self-certification process if the risk level of a product is considered minimal	a manufacturer's declaration that the product meets these requirements
Ex d / da / db / dc			EN/IEC 60079-1				Flameproof
Ex e / eb / ec			EN/IEC 60079-7				Increased Safety
Ex i / ia / ib / ic			EN/IEC 60079-11				Intrinsic Safety
Ex m / ma / mb / mc			EN/IEC 60079-18
Ex nA / nC / nL			EN/IEC 60079-15				Non Sparking
Ex o / ob / oc			EN/IEC 60079-6				Oil Immersion
Ex op is / op sh / op pr			EN/IEC 60079-28
Ex p / pxb / pyb / pzc			IEC 60079-2				Purge/Pressurised
Ex q / qb / qc			EN/IEC 60079-5				Quartz/Sand Filled
Explosion-proof (XP)	Ex d (Flameproof)		IEC 60079-1				Contain the explosion inside the enclosure
DIN EN 60950-1	IEC 60950-1			Germany
DIN Mark				Germany	TUV Rheinland		certifying component compliance with DIN, EN, IEC and ISO product safety standards
GS Mark			GPSG = Geräte- und Produktisicherheitgesetz	Germany	TUV Rheinland
VDE Mark				Germany	VDE Testing and Certification Institute		indicates conformity with the VDE standards, European or internationally harmonized standards and confirms compliance with protective requirements of the applicable EC Directive(s)
Group A	IIC	Acetylene
Group B	IIC	Hydrogen
Group C	IIB	Ethylene
Group Dsources differ	IIA	Propane
Group E		Combustible Metal Dusts
Group F		Class II
Hermetically sealed	Ex nC / Ex m		IEC 60079-15 / -18				Seal ignition source from atmosphere
Ex d			IEC 60079 series	IEC / ATEX			Flameproof enclosure
Ex e			IEC 60079 series	IEC / ATEX			Increased safety
Ex i			IEC 60079 series	IEC / ATEX			Intrinsic safety
Ex m			IEC 60079 series	IEC / ATEX			Encapsulation
Ex p			IEC 60079 series	IEC / ATEX			Pressurization
IIA		Propane		IEC / ATEX
IIB		Ethylene		IEC / ATEX
IIC		Hydrogen / acetylene		IEC / ATEX
T1		450°C		IEC / ATEX
T2		300°C		IEC / ATEX
T3		200°C		IEC / ATEX
T4		135°C		IEC / ATEX
T5		100°C		IEC / ATEX
T6		85°C		IEC / ATEX
Zone 0				IEC / ATEX			Explosive atmosphere present continuously or for long periods
Zone 1				IEC / ATEX			Explosive atmosphere likely during normal operation
Zone 2				IEC / ATEX			Explosive atmosphere unlikely in normal operation, only short duration eg. accidental leakage
Zone 20				IEC / ATEX			Combustible dust present continuously
Zone 21				IEC / ATEX			Dust likely during normal operation
Zone 22				IEC / ATEX			Dust unlikely except briefly
IEC 62368-1				IEC			a unified replacement for the previous two standards
IECEx							IECEx certificates are increasingly accepted as the basis for national approvals in both ATEX and non-ATEX countries
Supplier's Declaration of Conformity (SDoC)			ISO/IEC 17050-1:2004	International			a type of conformity assessment that allows a supplier to make a first-party attestation that an object of conformity fulfils specified requirements
Intrinsically Safe (IS)	Ex i (Ex ia, Ex ib)		IEC 60079-11				Limit energy below ignition threshold
PSE Mark			Electrical Appliance and Material Safety Law (DENAN)	Japan
KC Mark			Electrical Appliances and Materials Safety Control Law	Korea	Agency for Technology and Standards (KATS)
SIRIM			Electricity Supply Act 1990	Malaysia	SIRIM QAS International
NMX-J-521/1-ANCE	IEC 60335-1			Mexico
NOM Mark		household electrical appliances, IT, AV and similar equipment		Mexico	ANCE
Zone 0				NEC 500			The most hazardous environments (continuous explosive atmosphere) have no direct NEC 500 equivalent
A	IIC	Acetylene		NEC
Division 1sources differ	Zone 0 / Zone 20			NEC and CEC
Division 2	Zone 2 / Zone 22			NEC and CEC
B	IIC	Hydrogen		NEC
C	IIB	Ethylene		NEC
Class I				NEC			Flammable gases and vapors
Class I Division 1sources differ	Zone 0			NEC			Continuous hazard
Class I Division 2	Zone 2			NEC			Occasional hazard
Class II				NEC			Combustible dust
Class III				NEC			Ignitable fibers
D	IIA	Propane		NEC
Division 1				NEC			Hazard present during normal operation
Division 2				NEC			Hazard present only under abnormal conditions
E		Metal dust		NEC
F		Carbon dust		NEC
G		Grain / flour dust		NEC
Supplier's declaration of conformity			Electricity (Safety) Regulations 2010	New Zealand			required before placing on the market any low voltage or extra-low voltage fittings or appliances that have been declared as medium risk by the regulator
Non-incendive	Ex nA / Ex ec		IEC 60079-15 / -7				Normal operation cannot cause ignition
Nemko Mark				Norway	Nemko		signifies that Nemko has tested or certified the product according to national standards in Norway
Purged/Pressurized	Ex p (Ex px, Ex py, Ex pz)		IEC 60079-2				Maintain positive pressure with inert gas
EAC				Russia			used to indicate products that meet all of the technical requirements of the Eurasian Customs Union
SAFETY Mark				Singapore	Productivity and Standards Board (PSB)	requires all controlled goods to be individually marked
T1	T1	450º C (842ºF)
T2		300º C (572ºF)
T2A		280º C (536ºF)
T2B	T2	260º C (500ºF)
T2C		230º C (446ºF)
T2D		215º C (419ºF)
T3		200º C (392ºF)
T3A		180º C (356ºF)
T3B		165º C (329ºF)
T3C		160º C (320ºF)
T4		135º C (275ºF)
T4A		120º C (248ºF)
T5	T5	100º C (212ºF)
T6	T6	85º C (185ºF)
ta / tb / tc			EN/IEC 60079-31				Enclosure
BSMI		ITE and audio/ video products		Taiwan	Bureau of Standards, Metrology and Inspection
BS EN IEC 60335	IEC 60335	Safety rules for household appliances		UK			Identical adoption ensures UK manufacturers meet both European and international safety expectations
BS EN ISO 14001:2015	ISO 14001	Environmental management		UK			Identical adoption ensures UK businesses comply with international and European requirements
BS EN ISO 9001	ISO 9001			UK			if you're compliant with BS EN ISO 9001 in the UK, it's equal to compliance with both ISO 9001 internationally and EN ISO 9001 in Europe
BSI Kitemark				UK	British Standards Institution (BSI)	voluntary certification mark
UL Mark					Underwriters Laboratories		tested and determined that a product meets UL specified product safety requirements
UL 60335-1	IEC 60335-1			United States
AEx d	Zone 1	Class I	ISA 60079-1	US			Flame Proof
AEx e	Zone 1	Class I	ISA 60079-7	US			Increased Safety
AEx ia	Zone 0	Class I	ISA 60079-11	US			Intrinsic Safety
AEx iaD	Zone 20		ISA 61241-11	US
AEx ib	Zone 1	Class I	ISA 60079-11	US
AEx ibD	Zone 21		ISA 61241-11	US
AEx m	Zone 1	Class I	ISA 60079-18	US
AEx ma	Zone 0	Class I	ISA 60079-18	US
AEx mb	Zone 1	Class I	ISA 60079-18	US
AEx mbD	Zone 21		ISA 61241-18	US
AEx nA	Zone 2	Class I	ISA 60079-15	US
AEx nCsources differ	Zone 2	Class I	ISA 60079-15	US			Enclosed Break
AEx nR	Zone 2	Class I	ISA 60079-15	US
AEx o	Zone 1	Class I	ISA 60079-6	US
AEx pD	Zone 21		ISA 61241-2	US
AEx px	Zone 1	Class I	ISA 60079-2	US
AEx py	Zone 1	Class I	ISA 60079-2	US
AEx pz	Zone 2	Class I	ISA 60079-2	US
AEx q	Zone 1	Class I	ISA 60079-5	US			Power Filled
AEx tD	Zone 21		ISA 60079-31	US
ATEX/IECEx certification				US			not recognized in the US or Canada
Declaration of Conformity				US	Federal Communications Commission (FCC)		the U.S. Federal Communications Commission (FCC) has adopted a rule that permits recognition of SDoC (also sometimes called Self Declaration of Conformity) for certain information technology devices
(DIP)	Division 1	Class II	UL 1203	US
Ex	Zone 20, 21, 22		ISA 60079-0	US
FCC Certification			47 CFR § 15.201	US	Telecommunications Certification Body (TCB)	non-negotiable for anything with a wireless stack	any intentional radiator — a device designed to transmit RF for communication purposes, including Wi-Fi, Bluetooth, LTE, Zigbee, and similar protocols — must obtain FCC Certification through an accredited Telecommunications Certification Body (TCB) before it can be marketed in the US
(IS)sources differ	Division 1	Class I	UL 913 / FM 3610	US
NEC 505				US			NEC 505 (Zone-based) is accepted in the US and provides easier mapping from IEC zones
(NI)sources differ	Division 2	Class I	ISA 12.12.01/FM 3611	US			Non-Incendive
(PX)	Division 1	Class II	NFPA 496 (FM 3620)	US
(PZ)	Division 2	Class II	NFPA 496 (FM 3620)	US
Supplier's Declaration of Conformity (SDoC)		unintentional radiator		US	Federal Communications Commission (FCC)		a self-certification path under which the manufacturer tests to FCC limits internally and publishes a declaration
Type X	Division 1	Class I	NFPA 496 (FM 3620)	US
Type Y	Division 1	Class I	NFPA 496 (FM 3620)	US
Type Z	Division 2	Class I	NFPA 496 (FM 3620)	US
UL standard				US	UL Standards & Engagement	Standards are voluntary but can become mandatory and legally binding if referenced in adopted code, written into law, or required by a government agency like the U.S. Consumer Product Safety Commission	a published set of best practices for testing and evaluating the safety, security, and sustainability of a product or system
(XP)	Division 1	Class I	UL 1203	US			Explosion Proof
Zone 0	1G

Where this came from

Every record above links the page it was taken from and quotes the sentence that states it. These are the 12 sources this dataset was assembled from.

exknowledge.comhttps://exknowledge.com/pages/nec-500-vs-atex-iec.html
euroswitch.comhttps://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf
belfuse.comhttps://www.belfuse.com/resource-library/tech-paper/power-supply-safety-standards-agencies-and-marks
tuvsud.comhttps://www.tuvsud.com/en-us/services/product-certification/iecee-cb-scheme
nist.govhttps://www.nist.gov/standardsgov/compliance-faqs-ce-marking
blog.promise.legalhttps://blog.promise.legal/fcc-certification-ce-marking-connected-devices-hardware-startups/
ecocomply.aihttps://ecocomply.ai/blog/what-does-ce-marking-cost-for-your-product
boss.cenelec.euhttps://boss.cenelec.eu/homegrowndeliverables/en/pages/adev/
casco.iso.orghttps://casco.iso.org/attestations-of-conformity.html
inframena.comhttps://www.inframena.com/hazardous-area-classification-equivalency-guide/
knowledge.bsigroup.comhttps://knowledge.bsigroup.com/articles/just-how-identical-are-identical-standards
ulse.orghttps://ulse.org/standards/

Machine-readable

data.jsonThe whole dataset — every record with its source URL and source quote.
Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
How this is made and checkedWhat "verified against source" does and does not mean.

200 records. last verified against source 2026-08-11. due for re-check by 2027-08-11.

Licence. Factual compilation with source citations. Facts about which mark applies where and how classification systems map are taken with short attributed quotes linking back to the published guide or page. No standard text is reproduced.