000x
Greater than for Zone 1,
> 3x/day
Longer than for Zone 1
Zone Zone 21: Occasional formation of
potentially explosive atmospheres
≥ 10x,
< 1.
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Chapter The external lightning protection system
.3.000x
≥ 1x/month,
< 3x/day
Longer than 0.
Zone 1
In Zone normal operation, atmosphere can occasionally form mixture air combustible gases, va-
pours mist.2 Assignment the zones
Potentially explosive areas are divided into zones
according the duration and frequency the occur-
rence potentially explosive atmospheres. These
zones are always three-dimensional areas three-
dimensional space.
Intervals the occurrence potentially explosive atmospheres
Level risk
Interval occurrences
of mixtures (annual)
Interval occurrences of
mixtures (differentiated)
Dwell times the
mixtures
Zone Zone 20: Constant frequent form-
ation potentially explosive atmospheres
Greater than for Zone 1,
> 1.
Zone 21
In Zone 21, normal operation, dangerous, potentially explosive atmosphere can form occasionally the form
of cloud combustible dust contained the air.5 hrs
Definition zones
Ex zones Description
Zone 0
In Zone normal operation, dangerous, potentially explosive atmosphere can form over longer periods at
regular intervals mixture air combustible gases, vapours mist.
A further subdivision the potentially explosive areas
makes distinction between combustible gases and
combustible dusts.5 hrs,
shorter than hrs
Zone Zone 22: Normally short form-
ation potentially explosive atmospheres
≥ 1x,
< 10x
≥ 1x/year,
< 1x/month
Shorter than 0.
Zone 22
In Zone 22, normal operation, dangerous, potentially explosive atmosphere can normally not, only briefly,
form the form cloud combustible dust contained the air.
Zone 2
In Zone normal operation, potentially explosive atmosphere can normally not, only briefly, form mix-
ture air combustible gases, vapours mist.TBS
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2.
Zone 20
In Zone 20, normal operation, dangerous, potentially explosive atmosphere can form over longer periods at
regular intervals the form cloud combustible dust contained the air
