Hazardous Charts

Area Classifications Division vs. Zone

Type of Area

NEC and CEC (North America)

ATEX and IEC

Continuous Hazard

Division 1 or Zone 0

Zone 0

Intermttent Hazard

Division 1 or Zone 1

Zone 1

Hazard Under Abnormal Conditions

Division 2 or Zone 2

Zone 2

NEMA / CSA / UL Enclosure Types

Type

Application

Abbreviated Definition*

1

Indoor

General Purpose

2

Indoor

Protection Against Angled Dripping Water

3, 3R, 3S

Indoor / Outdoor

Protection Against Rain, Snow

4, 4X

Indoor / Outdoor

Protection Against Rain, Snow, Hose Directed Water

5

Indoor / Outdoor

Protection Against Angled Dripping Water, Dust, Fibres, Flyings

6

Indoor / Outdoor

Protection Against Temporary Submersion

6P

Indoor / Outdoor

Protection Against Prolonged Submersion

12, 12K

Indoor

Protection Against Circulating Dust, Fibres, Flyings

13

Indoor

Protection Against Circulating Dust, Fibres, Flyings, Seepage

*Refer to the Enclosure Standard for Detailed Definitions - CSA C22.2 No. 94, UL 50

Protection Methods for Potentially Explosive Gas / Vapour Atmospheres

Protection Method

North America Class I

Europe (CENELEC)
International (IEC)

Div.

Standard

Zone

Standard

Zone

Standard

Canada (CSA)

US

Canada (CSA)

US

European Norm (EN)

International (IEC)

Intrinsic Safety - ia (2 Faults)

1

C22.2 No. 157

FM3610/UL913

0

E60079-11

ISA 12.02.01/UL2279

0

50020

60079-11

Intrinsic Safety - ib (1 Faults)

1

E60079-11

ISA 12.02.01/UL2279

1

50020

60079-11

Explosionproof Flameproof - D

1

C22.2 No. 30

FM3615/UL1203

1

E60079-1

ISA S12.22.01/UL2279

1

50018

60079-1

Purged Pressurized - P

1 / 2

CSA TIL 13A/NFPa 496

NFPA 496

1 / 2

E60079-2

1

50016

60079-2

Increased Safety - E

1

E79-7

ANSI/ISA S12.16.01/UL2279

1

50019

60079-7

Encapsulation - M

1

E79-18

ISA S12.23.01/UL2279

1

50028

60079-18

Oil Immersion - O

1

E79-6

ANSI/ISA S12.26.01/UL2279

1

50015

60079-6

Powder Filled - Q

1

E60079-5

ANSI/ISA S12.25.01/UL2279

1

50017

60079-5

Non-Icendive / Non-Sparking

2

C22.2 No. 213

FM3611/UL1604

Protection - N

2

E60079-15

UL2279

2

50021

60079-15

Special Requirements (2 Protection Methods)

0

50284

Protection Methods for Combustible / Ignitable Dust Atmospheres

Protection Method

North America Class II, III

Europe (CENELEC)
International (IEC)

Div.

Standard

Zone

Standard

Canada (CSA)

US

European Norm (EN)

International (IEC)

Intrinsic Safety - ia

1

C22.2 No. 157

FM3610/UL913

Dust Ignition Protection

1

C22.2 No. 25 or E61241-1-1

UL 1203

20 / 21 / 22

EN50281-1-1

61241-1-1

Purged

1 / 2

NFPA 496

61241-4

Dust Tight

2

C22.2 No. 25 or E61241-1-1

FM3611/UL1604

Non-Incendive

2

FM3611/UL1604

Hazardous Locations Equipment Marking

Markings for North America

Markings for Europe

Option A: (ZoneSystem)

Option B: (DivisionSystem)

ATEC Directive (94/9/EC) On

CENELEC (European) Directive (76/117/EEC)

Ex ia IIC T4 (Canada)
Class I Zone 0 AEx ia IIC T4 (U.S.)

Potentially Explosive Atmospheres

Flammable Gas or Vapour

Area Classification

Conformity to U.S. Requirements

Explosion Protected

Protection Method - (Intrinsic Safety)

Gas Group (Acetylene & Hydrogen)

Temperature Code

Flammable Gas or Vapour

Area Classification

Gas Group (Acetylene (A), Hydrogen (B), Ethyene (C), Propane (D))

Temperature Code

CE Marking Symbol

ID No. of Notified Body of the OA System

EU Explosive Atmospheres Symbol

Surface (Non-Mining) Equipment

Equipment Category

Type of Flammable Substance

Conformity to CENELEC Standard

Explosion Protected

Protection Method (Intrinsic Safety)

Gas Group (Acetylene & Hydrogen)

Temperature Class

EU Marking for Explosion Protection (Optional)

Class I

Zone 0

A

Ex

ia

IIC

T4

Class I

Division 1

Groups A, B, C, D

T4

...

II

1

G

EEx

EEx

ia

IIC

T4

ATEX Directive 94/9/EC

Equipment Group

Equipment Category and Level of Protection

Presence of Explosive Atmosphere

Flammable Substances

Correlation with Hazardous Areas

I - Mines

M1 - Very High Level of Protection

Presence

Methane, Dust

M2 - High Level of Protection

Risk or Presence

II - Surface

1 - Very High Level of Protection

Continuous Presence

G-Gas, Vapours Mist, D-Dust

Zone 0 (Gas etc.)
Zone 20 (Dust)

2 - High Level of Protection

Likely to Occur

Zone 1 (Gas etc.)
Zone 21 (Dust)

3 - Normal Level of Protection

Unlikely to Occu

Zone 2 (Gas etc.)
Zone 22 (Dust)

Ingress Protection (IP) Codes

First Numeral Protection Against Solid Bodies

Second Numeral Protection Against Water

0

No Protection

0

No Protection

1

Object Greater Than 50mm

1

Vertically Dripping

2

Objects Greater Than 12.5mm

2

Angled Dripping (15° Tilted)

3

Objects Greater Than 2.5mm

3

Spraying

4

Objects Greater Than 1.0mm

4

Splashing

5

Dust-Protected

5

Jetting

6

Dust-Tight

6

Powerful Jetting

7

Temporary Immersion

8

Continuous Immersion

Temperature Codes & Classes

Maximum Surface Temperature (°C)

US (NEC) Canada (CEC)

US (NEC) Canada (CEC) IEC, CENELEC

450

T1

T1

300

T2

T2

280

T2A

260

T2B

230

T2C

215

T2D

200

T3

T3

180

T3A

165

T3B

160

T3C

135

T4

T4

120

T4A

100

T5

T4

82

T6

T6

Appartus Grouping

Typical Gas / Dust / Fibres / Flyings

US (NEC) Canada (CEC)

US (NEC) Canada (CEC) IEC, CENELEC

Acetylene

Class I, Group A

Group IIC

Hydrogen

Class I, Group B

Ethylene

Class I, Group C

Group IIB

Propane

Class I, Group D

Group IIA

Methane

Gaseous Mines*

Group I*

Magnesium

Class II, Group E

IEC, CENELEC Do Not Subdivide by Material Types

Coal

Class II, Group F

Grain

Class II, Group G

Cotton

Class III

*Not Within Scope of NEC or CEC

Class I - Gas / Vapour / Mist
Class II - Dust
Class III - Fibres, Flyings