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Zone 21
Includes areas which explosive
atmosphere consisting dust-air mixtures
can expected occur occasionally and
short term.
Directive 99/92 (Workplace Directive)
Also important the description hazard
areas explosion-prone workplaces, and a
resulting graded safety profile for the
“equipment” used.176
The Lighting Handbook
Explosion-proofness b
Flammable gases, vapours and mists
Zone 0
A hazardous explosive atmosphere is
present continuously long term.
Zone 1
A hazardous explosive atmosphere can be
expected occur occasionally.
Zone 22
Includes areas which explosive
atmosphere cannot expected occur
due disturbance deposited dust.
Directive 94/9/EC
Directive 94/9/EC specifies the requirements
for all devices and protection systems for
use explosion-prone areas.
Combustible dusts
Zone 20
Includes areas which there perma-
nent, long-term frequent explosive at-
mosphere consisting dust-air mixtures.
Manufacturers explosion-proof
equipment have provide evidence a
quality assurance system tested a
“notified body”. Since July 2003,
it has superseded all directives explosion
protection previously effective European
level.
Zone 2
A hazardous explosive atmosphere can be
expected occur only rarely and, any,
short term. an
explosive atmosphere should nevertheless
occur, this will most probably happen only
rarely and short term.
A detailed commentary Directive
94/9/EC included the “Directive 94/9/EC
by the European Parliament and the Council
of March 1994” section.
. Over and
above this, this Directive now directly
includes the “Basic safety requirements” for
explosion-proof equipment.
As this Directive was drafted according
to the EC’s “new approach”, the manu-
facturer’s declaration conformity, com-
bined with marking the products,
was introduced for explosion-proof equip-
ment well
