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EDUCATION

HAZARDOUS AREA REFERENCE CHART

NORTH AMERICAN HAZARD CATEGORY

	Example	NEC 500-503	NEC 505
CLASS I (Gases and Vapors)	Acetylene Hydrogen Ethylene Propane	Group A Group B Group C Group D	IIC IIC or IIB+H₂ IIB IIA
CLASS II (Dusts)	Metal dust Coal dust Grain dust	Group E Group F Group G
CLASS III (Fibers & Flyings)	Wood,paper or cotton processing.	No sub-groups

GAS GROUPING

Typical gas hazard	North America NEC Article 500 (Class I)	CENELEC EN 50 014 IEC
ACETYLENE	A	IIC
HYDROGEN	B	IIC or IIB +H₂
ETHYLENE	C	IIB
PROPANE	D	IIA
Gas classification and ignition temperatures relate to mixtures of gas and air at ambient temperature and atmospheric pressure.

COMBUSTION TRIANGLE

AREA CLASSIFICATION

	Continuous hazard	Intermittent hazard	Hazard under abnormal conditions
NORTH AMERICA /NEC500-503	Division 1	Division 1	Division 2
IEC/CENELEC/EUROPE /NEC505⁺	Zone 0 (Zone 20 dust)	Zone 1 (Zone 21 dust)	Zone 2 (Zone 22 dust)
SAFETY CATEGORIES VAPORS^*	G1	G2	G3
SAFETY CATEGORIES DUSTS^*	D1	D2	D3

Zones and Divisions and safety categories: a measure of the likelihood of the hazard being present. This defines the method of protection which may be used. NEC - National Electrical Code is a registered trademark, National Fire Protection Association NEC 505 covers explosive gases and vapors only * according EU directive 94/9 EU (ATEX)

TEMPERATURE CLASSIFICATION

Max. surface temp.(°C)	NEC Table500-3(d)	IEC79-8 T Class	EN 50 014
450°C	T1	T1	T1
300°C	T2	T2	T2
280°C	T2A	--	--
260°C	T2B	--	--
230°C	T2C	--	--
215°C	T2D	--	--
200°C	T3	T3	T3
180°C	T3A	--	--
165°C	T3B	--	--
160°C	T3C	--	--
135°C	T4	T4	T4
120°C	T4A	--	--
100°C	T5	T5	T5
85°C	T6	T6	T6

A full list of gases and temperature classifications is published in the Crouse-Hinds Code Digest.

METHODS OF EXPLOSION PROTECTION

Method of protection	Permitted in Division	Permitted in Zone	IEC Standard 79-	CENELEC Standard EN 50...	Code letter IEC Ex... CENELEC EEx...
GENERAL REQUIREMENTS	-	-	0	014	-
OIL IMMERSION	1 or 2	1 or 2	6	015	o
PRESSURIZATION	1 or 2	1 or 2	2	016	p
POWDER /SAND FILLING	2	1 or 2	5	017	q
FLAMEPROOF	-	1 or 2	1	018	d
INCREASED SAFETY	2	1 or 2	7	019	e
INTRINSIC SAFETY	1 or 2	0*,1 or 2	11	020(apparatus) 039(systems)	ia or ib
FACTORY SEALING	1 or 2	1 or 2	-	-	-
ELECTRICAL APPARATUS with typeof protection "n"^	2	2	15	021(pending)	n
ENCAPSULATION	-	1 or 2	18	028	m
SPECIAL	-	1 or 2	None**	None	s

*ia: Zone 0,1,2; ib: Zone 1,2, not Zone 0 ** mentioned in IEC 79-0
^ includes non-sparking, restricted breathing, hermetically-sealed, non-incendive, etc.

NORTH AMERICAN AND EU TESTING AUTHORITIES

Country	Testing Authority	Country	Testing Authority
USA	Underwriters Laboratories	USA	Factory Mutual
USA	ETL	Canada	CSA
Mexico	ANCE	Austria	TÜV-A
Austria	BVFA	Belgium	ISSEP
Denmark	DEMKO	Finland	VTT
France	INERIS	France	LCIE
Italy	CESI	Netherlands	KEMA
Norway	NEMKO	Spain	LOM
Sweden	SP	United Kingdom	BASEEFA/EECS
United Kingdom	SCS	Germany	PTB
Germany	BVS

INGRESS PROTECTION: (IP) CODES AND NEMA TYPES

FIRST NUMERAL Protection against solid bodies	SECOND NUMERAL Protection against liquid
0 - NO PROTECTION	0 - NO PROTECTION
1- OBJECTS EQUAL TO OR GREATER THAN 50 mm	1 - VERTICALLY DRIPPING WATER
2 - OBJECTS EQUAL TO OR GREATER THAN 12.5 mm	2 - 75 TO 105°-ANGLED DRIPPING WATER
3 - OBJECTS EQUAL TO OR GREATER THAN 2.5 mm	3 - SPRAYING WATER
4 - OBJECTS EQUAL TO OR GREATER THAN 1.0 mm	4 - SPLASHING WATER
5 - DUST-PROTECTED	5 - WATER JETS
6 - DUST-TIGHT	6 - HEAVY SEAS, POWERFUL WATER JETS
	7 - EFFECTS OF IMMERSION
	8 - INDEFINITE IMMERSION

Example: IP56

FIRST NUMERAL Protection against solid bodies	SECOND NUMERAL Protection against liquid
0 - NO PROTECTION	0 - NO PROTECTION
1- OBJECTS EQUAL TO OR GREATER THAN 50 mm	1 - VERTICALLY DRIPPING WATER
2 - OBJECTS EQUAL TO OR GREATER THAN 12.5 mm	2 - 75 TO 105°-ANGLED DRIPPING WATER
3 - OBJECTS EQUAL TO OR GREATER THAN 2.5 mm	3 - SPRAYING WATER
4 - OBJECTS EQUAL TO OR GREATER THAN 1.0 mm	4 - SPLASHING WATER
5 - DUST-PROTECTED	5 - WATER JETS
6 - DUST-TIGHT	6 - HEAVY SEAS, POWERFUL WATER JETS
	7 - EFFECTS OF IMMERSION
	8 - INDEFINITE IMMERSION

Conversion of Enclosure Type numbers to IEC Classification Designations
(Cannot be used to convert IEC Classification Designations to NEMA Type numbers)

NEMA ENCLOSURE
TYPE NUMBER IEC ENCLOSURE
CLASSIFICATION DESIGNATION

3 IP54

3R IP54

3S IP54

4 and 4X IP56

5 IP52

6 and 6P IP67

12 and 12K IP52

NEMA and UL Types of Enclosures.

Type 3 Enclosure
Type 3 enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet and external ice formation.

Type 3R Enclosure
Type 3R enclosures are intended for outdoor use primarily to provide a degree of protection against falling rain and external ice formation.

Type 3S Enclosure
Enclosures are intended for outdoor use primarily to provide a degree
of protection against rain, sleet, windblown dust, and to provide
for operation of external mechanisms when ice laden.

Type 4 Enclosure
Type 4 enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, hose-directed water and external ice formation.

Type 4X Enclosure
Type 4X enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, hose-directed water and external ice formation.

Type 7 Enclosure
Type 7 enclosures are for use indoors in locations classified as Class I, Groups A, B, C or D, as defined in the National Electrical Code®.

Type 9 Enclosure
Type 9 enclosures are for use in indoor locations classified as Class II, Groups E, F or G, as defined in the National Electrical Code®.

Type 12 Enclosure
Type 12 enclosures are intended
for indoor use primarily to provide degree of protection against dust, falling dirt and dripping noncorrosive liquids.