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Hazardous Areas

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HAZARDIOUS AREA

Hazardous Areais considered to be an area where a potential for explosionand/or fire exists due to flammable gases / vapors .

The normal processing of certain volatile chemicals.

Accidental failure of storage systems.

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Area Classification Or Zones

For Safe working Practice, Areas are divided into zone or class.

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ZONE 0

Zone 0is where Flammable Atmospheres are continuously present, orpresent for long periods, ie. Greater than 1000 hours per year. Permitted form

of protection: Ex'ia'.

LPG Tanks

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Zone 1

Zone 1is where Flammable Atmospheres are likely to occur during normaloperation. i.e. 10-1000 hours per year. Permitted forms of protection: Any

type of protection suitable for Zone 0 and Ex'd', Ex'ib', Ex'p', Ex'e', Ex's',

Ex'm'.

Oil Storage Area

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ZONE 2

Zone 2is where Flammable Atmospheres are not likely to occur during normaloperation and if they occur will only exist for a short time. Often referred to as the

'Remotely Hazardous Area'. i.e Less than 10 hours per year. Permitted forms of

protection: Any type of protection suitable for Zone 0 and 1 and Ex'N' or Ex'n', Ex'o',

Ex'q'.

ManufacturingIndustry

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Can you decode EEx d IIA T6 IP 54 now?

EEx d IIA T6 IP 54

EEx Certified equipment for hazardous areas according toEuropean Standards

d Explosion Proof

IIA Propane gas group

T6 Maximum surface temperature as high as 450 deg C

IP 54 Dust protected and Protected against splashed water from

all sides

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Slide no. 15

Kadanwari Electrical Training 2004