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ZONE 1
ZONE 2
Explosionproof switchgear assemblies 'e'
The explosionproof switchgear assemblies are
intended for use in Zone 1 and Zone 2 explosive
gas atmospheres according to IEC 60079-0 and
IEC 60079-7. IEC 60079-7 'Equipment protec-
tion by increased safety e' covers explosionproof
equipment for equipment protection levels 'Gb'
(Zone 1) and 'Gc' (Zone 2) and the levels of pro-
tection 'eb' and 'ec'.
Strict observation of the correct use of the levels
of protection 'eb' and 'ec' is essential to ensure
that equipment with the level of protection 'ec' is
not suddenly installed Zone 1 areas. It goes
without saying that equipment in the type of pro-
tection 'Increased Safety e' as well as in the type
of protection 'Increased Safety eb' may still be
used in both Zone 1 and Zone 2.
Simultaneously with the introduction of the two
levels of protection, the type of protection 'nA' is
being replaced by the type of protection 'ec'.
Newly supplied explosionproof controlgear com-
binations all comply with IEC 60079-7:2015.
The enclosures can be made of stainless steel
(AISI 316L or 304) or stove-enamelled steel. In
addition to a standard range with 16 different
enclosure dimensions, stainless steel enclo-
sures can be made to customer specifications.
The covers of smaller enclosures are screwed
on, while doors with square bolts are available
for larger enclosures.
Further empty Ex enclosures from well-known
suppliers are included in the certificate. This
means that existing constructions or dimensions
can be taken into consideration in mechanical
engineering. Various manufacturers of empty
enclosures offer the same dimensions for both
the industrial and the Ex sector.
A range of polyester enclosures with 4 compat-
ible dimensions can be joined together by
means of plugged flange connections using a
building block system. The external openings
are fitted with flanges for accommodating cable
glands. If screened cables are installed, brass
flanges with suitable cable glands are available
for the integration of the screening in the equipo-
tential bonding system or for the connection to
the protective earth conductor. In addition, the
enclosures can be fitted with covers of different
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