Klassifikasie vir gevaarlike gebiede - Noord-Amerika

Klas ek

Hazardous because flammable gases or vapors are present (or may be present) in quantities sufficient to produce explosive or ignitable mixtures.

klas II

Hazardous because combustible or conductive dusts are present (or may be present) in quantities sufficient to produce explosive or ignitable mixtures.

Klas III

Hazardous because ignitable fibers or flyings are present (or may be present) in quantities sufficient to produce explosive or ignitable mixtures.

Afdeling 1

The substance referred to by class has a high probability of producing an explosive or ignitable mixture due to it being present continuously, intermittently, or periodically or from
die toerusting self onder normale werksomstandighede.

Afdeling 2

The substance referred to by class has a low probability of producing an explosive or ignitable mixture and is present only during abnormal conditions for a short period of time - such as a container failure or system breakdown

Groep A

Atmosphere containing acetylene.

Groep B

Atmosfeer wat 'n vlambare gas bevat, 'n vlambare vloeistof geproduseerde damp, of 'n brandbare vloeistof geproduseerde damp gemeng met lug wat kan brand of ontplof, met 'n MESG (Maksimum eksperimentele veilige gaping)¹⁾ value less than or equal to 0.45 mm or a MIC (Minimum Igniting Current)²⁾ ratio less than or equal to 0.40 - such as hydrogen or fuel and combustible process gases containing more than 30% hydrogen by volume - or gases of equivalent hazard such as butadiene, ethylene oxide, propylene oxide and acrolein.

Groep C

Atmosphere containing a flammable gas, a flammable liquid produced vapor or a combustible liquid-produced vapor whose MESG is greater than 0.75 mm or MIC ratio is greater than 0.40 and less than 0.80 - such as carbon monoxide,ether, hydrogen sulfide, morphline, cyclopropane, ethyl, isoprene, acetaldhyde and ethylene or gases of equivalent hazard.

Groep D

Atmosphere containing flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a MESG value greater than 0.75 mm or a MIC ratio greater than 0.80 - such as gasoline, acetone, ammonia, benzene, butane, ethanol, hexane, methanol, methane, vinyl chloride, natural gas, naphtha, propane or gases of equivalent hazard.

Groep E

Atmosphere containing combustible metal dusts, including aluminum, magnesium, bronze, chromium, titanium, zinc and their commercial alloys or other combustible dusts whose particle size, abrasiveness and conductivity present similar hazards in connection with electrical equipment.

Groep F

Atmosphere containing carbonaceous dusts, carbon black, coal black, charcoal, coal or coke dusts that have more than 8% total entrapped volatiles or dusts that have been sesitized by other materials so they present an explosion hazard.

Groep G

Atmosphere containing combustible dust not included in Group E & F - such as flour, grain, starch, sugar, wood, plastics and chemicals.

0 Zone

Ontbrandbare konsentrasies van vlambare gasse of dampe wat voortdurend of vir lang tydperke teenwoordig is.

1 Zone

Ontbrandbare konsentrasies van vlambare gasse of dampe wat waarskynlik onder normale werksomstandighede sal voorkom.

2 Zone

Ontvlambare konsentrasies van vlambare gasse of dampe wat waarskynlik nie onder normale werkomstandighede sal voorkom nie en dit slegs vir 'n kort tydjie doen.

20 Zone

'N Gebied waar brandbare stof of ontsteekbare vesels en vlieë voortdurend of vir lang periodes teenwoordig is.

21 Zone

'N Gebied waar brandbare stof of ontsteekbare vesels en vlieë waarskynlik onder normale werkomstandighede sal voorkom.

22 Zone

'N Gebied waar brandbare stof of ontvlambare vesels en vlieë waarskynlik nie onder normale werkomstandighede sal voorkom nie, en dit slegs vir 'n kort tydjie doen.

Groep I

Myne
vatbaar vir vuur (vlambare mengsel van gasse wat natuurlik in 'n myn voorkom).

Groep II

Ontplofbare gas
atmosfeer anders as myne wat vatbaar is vir vuur. Groep II-toerusting word onderverdeel in drie subgroepe.

A

Atmosfeer met propaan, asetoon, benseen, butaan, metaan, petrol, heksaan, verfoplosmiddels of gasse en dampe met dieselfde gevaar.

B

Atmosfeer met etileen, propeen-oksied, etileenoksied, butadieen, siklopropaan, etieleter, of gasse en dampe met dieselfde gevaar.

C

Atmosfeer met asetileen, waterstof, koolstofdisulfied of gasse en dampe met dieselfde gevaar.

Groep III

Ontplofbare stof 
atmosfeer. Groep III-toerusting word onderverdeel in drie subgroepe.

A

Atmosfeer met brandbare vlieë.

B

Atmosfeer wat nie-geleidende stof bevat.

C

Atmosfeer met geleidende stof.