II 2 G Ex d IIC T4

Zoning Definitions

ZonesGas Dust

A place in which an explosiveatmosphere is continually present

A place in which an explosiveatmosphere is likely to occur in normaloperation occasionally

A place in which an explosive atmosphereis not likely to occur in normal operation,but if it does only occurs for short periods

Definitions

IP Code

1st Numerical 2nd NumericalProtection against Solid Bodies Protection against Liquid

0 No protection 0 No protection1 Objects > 50mm 1 Vertically dripping water2 Objects > 12mm 2 Drops of liquid (75° to 90°)3 Objects > 2.5mm 3 Sprayed water4 Objects > 1mm 4 Splashed water5 Dust-protected 5 Water jets6 Dust-tight 6 Heavy seas

7 Effects of immersion8 Indefinite immersion

Categories

ATEX Cat.

1G Equip. suitable for zone 01D Equip. suitable for zone 20

2G Equip. suitable for zone 12D Equip. suitable for zone 21

3G Equip. suitable for zone 23D Equip. suitable for zone 22

Typical ZoneSuitability

Dusts

Zone

20 Requires 1D equipment IP6X

21 Requires 1D or 2D equipment IP6X

22 Requires 3D, 2D or 1D equipment IP5X*

* Must be IP6X if dust is electrically conductive

ATEX CategoryIP

Rating

Types of Protection

Temperature

GASType of Protection

General Requirements – EN 60079-0

Intrinsic Safety Ex ia & ib EN 60079-11

Increased Safety Ex e EN 60079-7

Flameproof Ex d EN 60079-1

Pressurisation Ex p EN 60079-2

Powder Filling Ex q EN 60079-5

Encapsulation Ex ma &mb EN 60079-18

Oil Immersion Ex o EN 60079-6

Type n Ex n EN 60079-15

Standard

Non-electrical Equipment (concepts)

EN 13463-1 Basic methods & requirements

EN 13463-2 Flow restricting enclosure fr

EN 13463-3 Flame-proof enclosure d

EN 13463-5 Constructional safety c

EN 13463-6 Control of ignition sources b

EN 13463-7 Pressurisation p

EN 13463-8 Liquid immersion k

Complies with European Directive EC Mark

XXXX

Notified BodyNumber

EquipmentGroup

EquipmentCategory

Gas

ExplosionProtection

Type ofProtection Gas Group*

A, B or C*If omitted suitable for all gas groups

TemperatureClass

(T1-T6)

Conformity Assessment ‘Quality Modules’

Design Phase

EC-Type Examination

Internal Control of Production

Unit Verification

Production Phase

Production Quality Assurance

Product Quality Assurance

Product Verification

Conformity to Type

Internal Control of Production

Unit Verification

Module Annex*1 *2

ProtectiveSystem

B III ✔ ✔ ✔ ✔ ✔

A VIII ✔*4 ✔*4 ✔

G IX O O O O O O O O

D IV Y Y Y

E VII Y Y

F V Y Y Y

C VI Y Y

A VIII ✔ ✔ ✔

G IX O O O O O O O O

Marking forGas Hazards

T-Class

T1 450

T2 300

T3 200

T4 135

T5 100

T6 85

Max surfacetemp in °C

Groups

Gas Groups

I Electrical equipment intended for use in mines susceptibleto firedamp

II Electrical equipment intended for use in places with anexplosive gas atmosphere other than mines susceptible tofiredamp

III Electrical equipment intended for use in places with anexplosive dust atmosphere other than mines susceptible tofiredamp*

IIA Propane

IIB Ethylene

IIC Hydrogen/Acetylene

Dust Groups*IIIA Combustible Flyings

IIIB Non-conductive Dust

IIIC Conductive DustType n EN60079-15Enclosed break device nCNon-incendive component nCHermetically sealed device nCSealed device nCEncapsulated device nCEnergy limited apparatus & circuits nLRestricted breathing enclosure nRNon sparking nA

III 2 D Ex tD A21 IP66 T80°CComplies with

European Directive EC Mark

XXXX

Notified BodyNumber

EquipmentGroup

EquipmentCategory

Dust

ExplosionProtection

Type ofProtection

Marking forDust or Flyings

and FibresHazards

Conformity Assessment ‘Quality Modules’ Table

* Notes:1 “Global Approach” OJEC No.L220, 19932 ATEX Directive 94/9/EC3 Suffix (E) refers to electrical equipment and

internal combustion enginesSuffix (N) refers to non-electrical equipment

4 Technical Files to be deposited with a notified body

KEY✔ = mandatory unless Unit Verification is usedO = optional as an alternative to other modulesY = one of two production phase modules for

the equipment category to be chosen by the manufacturer

Equipment Category *3

M1 M2 M2 1 2 2 3(E) (N) (E) (N)

EN 60079-10 EN 61241-10

0 20

1 21

2 22

Equipment Threshold power Thermal Initiation Timefor (W) (averaging period)

(µs)

The information in this wall chart is for guidance only. For detailed information see relevant Directives and Regulations.

START

Is area zoned?

Zone 1?Is equipmentEx d concept?

Is equipmentEx i concept?

Use non-certifiedcable glands*refer to note 1

Refer to Ex dcable selector

chart

Gland type

Ex e concept Ex n* or Nconcept

Zone 2

Use non-certifiedcable glands*refer to note 2

Use certifiedcable glands

Brass

Yes

Yes No

Yes

Yes No

Yes No

No

Yes No

Yes

No No No

Plastic

Use a suitable flameproof cable

gland with a sealing ring.(Gland with elastomeric

seals)

Is the area of installation of

Zone 1?

Is the volume of enclosure

greater than 2 dm3?

Use a barrier gland

Does the hazardous

gas require IIC apparatus?

Yes

Ex e concept

*refer to note 3

Does this enclosure contain an

internal source of ignition?

Extronics Ltd · Meridian House · Roe Street · Congleton · Cheshire · CW12 1PG · Tel: +44 (0)1260 292651 · Fax: +44 (0)1260 297280 · www.extronics.com · info@extronics.com

Extronics Products • Explosion Proof & Pressurised Solutions • Engineered Solutions, Bespoke Certification and Development • Training & Certification Services

Cable Gland Selection

Note 1: Non certified cable glandsmay be used provided that theymaintain the minimum IP rating onthe certified equipment of IP54 foroutdoors and IP20 for indoorequipment.

Note 2: Non certified cable glandsmay be used provided they meetthe requirements of EN60079-0 andEN60079-7 or EN60079-15.

Note 3: Internal sources of ignitioninclude sparks or equipmenttemperatures occurring in normaloperation which can cause ignition.An enclosure containing terminalsonly or an indirect entry enclosure isconsidered not to constitute aninternal source of ignition.

Radio Frequency SourcesThe threshold power of radio frequency (10 kHz to 300 GHz) for continuous transmissions and for pulsedtransmissions whose pulse durations exceed the thermal initiation time shall not exceed the values shown in Table 4.Programmable or software control intended for setting by the user shall not be permitted.For pulsed radar and other transmissions where the pulses are short compared with the thermal initiation time, thethreshold energy values Zth shall not exceed those given in Table 5.

ATEX Certification Definitions

Table 4 from IEC 60079-0 Radio Frequency Power Thresholds

Group I 6.0 200

Group IIA 6.0 100

Group IIB 3.5 80

Group IIC 2.0 20

Group III 6.0 200

Equipment Threshold Energy Zthfor (µJ)

Table 5 from IEC 60079-0 Radio-frequency Energy Thresholds

Group I 1500

Group IIA 950

Group IIB 250

Group IIC 50

Group III 1500

© Extronics Ltd 2008 07/08

DUSTType of Protection

General Requirements – EN 61241-0:2006

Protection by Enclosures tD EN 61241-1:2004

Protection pD EN 61241-4:2006

Intrinsic Safety iD EN 61241-11:2006

Encapsulation mD EN 61241-18:2004

StandardATEXCode

ATEXCode

Ingress protectionand max. surface

temperature

*Taken from the new IEC60079-0 2007

Other Useful Standards

US Enclosure Ratings NEMA 7 to 10 Hazardous Area Enclosures

Simple Apparatus

Assessment of inadvertent ignition of flammable atmospheresby radio frequency radiation (guide)

Explosive atmospheres - Explosion prevention and protection.Part 1, Basic concepts & methodology for surface industry

Explosive atmospheres - Explosion prevention and protection.Part 2, Basic concepts & methodology for mining

Classification of hazardous areas

Electrical installations in hazardous areas (other than mines)

Electrical installations inspection and maintenance

Equipment repair, overhaul and reclamation

Protection of equipment and transmission systems usingoptical radiation

BS6656

EN1127-1

EN1127-2

EN60079-10

EN60079-14

EN60079-17

EN60079-19

EN60079-28

NEMA, UL& CSA

type rating

ApproximateIEC/IP

classificationAbbreviated Protection Description

1 IP202 IP223 IP553R IP244 IP66

4X IP66

6 IP67

Indoor, from contact with contentsIndoor, limited, falling dirt and waterOutdoor, from rain, sleet, windblown dust & ice damageOutdoor, from rain, sleet & ice damageIndoor & outdoor, from windblown dust, rain, splashing& hose directed water & ice damageIndoor & outdoor, from corrosion, windblown dust, rain,splashing & hose directed water & ice damageIndoor & outdoor, from hose directed water, water entryduring submersion & ice damage

Mechanical Impacts (UK) Code EN50102

IK Code IK00 IK01 IK02 IK03 IK04 IK05 IK06 IK07 IK08 IK09 IK10

ImpactEnergy * 0.14 0.2 0.35 0.5 0.7 1 2 5 10 20(Joules)

5V in

Passive components

Well defined sources of stored energy considered in safety analysis

Sources of generated energy notmore than *1.5V, 100mA & 25mW

NOT piezoelectric crystalprotected componentsvoltage or current enhancement

* Note: North America still uses 1.2V and 20 microjoules