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it has superseded all directives explosion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