Wieland all products Brochure
facts & DATA
Explanations of Applications
in Hazardous Areas
Technical information
• The information regarding cross sectional area and connection types
pertains to unprepared wires without ferrules!
Ferrules are not necessary for secure connection!
Whenever ferrules are used, make sure that the tools specified by
the manufacturer are used exclusively.
• The voltage ratings apply to the terminals in their intended application. When different products are mounted
adjacent to each other, the proper isolation
distances must be adhered to.
• If the ground blocks are not used in block
assemblies, but are mounted to the rail as
single terminal blocks, end clamps have to
be used.
• A detailed description of technical data,
the standards requirements, and the
application conditions are available on
the facts
& DATA sheet.
ATEX regulation
• For the use of DIN rail terminal blocks in Ex
areas, the regulations of EN 60079-0
apply; whereas for increased safety Ex e
the regulations of EN 60079-7 must be
followed. For an approximation of the laws
of the EU member states directive 94/9/EG
was created, which is generally known as
ATEX 100a and which is the basis for harmonization in this field. ATEX stands for ”atmosphere explosive”
while 100a refers to the corresponding article of the EC contract.
• Directive ATEX 100a applies for protection against dust and gas explosions in all industrial Ex areas and
in mining. The testing and certifying institutes named in directive ATEX 100a must follow accreditation
procedures which are the same throughout Europe.
• In accordance with EN 60079-xxx and ATEX 100a, these certifying institutes write out EC certificates for
prototype tests. These prototype test certificates for components together with the corresponding quality
system certification of the supplier are required to obtain the so-called ATEX approval.
• In combination with the
meanings:
II Device group
2 Category
G D Areas
KEMA Name of testing institute
ATEX... Certificate, year of testing, number
Identification
O
-mark, the markings of the Wieland terminal blocks have the following
O
0114.2 MC 0 3/11
General
Explanations of applications in hazardous areas
Before 2003-06-30 the Ex protection directive 76/117/EWG applied for the
EC and was translated into the relevant national law. For an approximation
of the laws of the EU member states, directive 94/9/EG was created, which
is generally known as ATEX 100a and which is the basis for harmonization in
this field.
ATEX stands for “atmosphere explosive”. When the transition period expires
on 2003-06-30, all Ex certificates based on the Ex protection directive
76/117/EC will become invalid. In Ex areas only the ATEX directive will apply
then.
For the use of DIN rail terminal blocks in Ex areas with increased safety
Ex “e” the regulations EN 60079-0 and EN 60079-7 apply also.
p The testing and certifying
institutes named in ATEX
directive must follow
accreditation procedures
which are the same
throughout Europe.
p DIN rail terminal blocks by
Wieland with rising cage
clamp, spring and IDC
connection provide the
required protection against
self-loosening.
p The connector cross sections,
rated currents and rated
voltages indicated for the
terminal blocks in addition to
the ATEX identification are
part of the certificates.
p The ATEX directive applies
to protection against dust
and gas explosions in all
industrial Ex areas as well as
in mining.
In accordance with EN 60079-0/-7 and
the ATEX directive, these certifying institutes issue EC certificates for prototype
tests. These prototype test certificates for
components together with the corresponding quality system certification of
the supplier are required to obtain the
so-called ATEX approval.
→ In addition to solid and stranded wires,
also fine-stranded wires without
ferrules can be connected.
→ The indicated values for the current
carrying capability refer to a maximum
ambient temperature of 40 °C.
When the terminal blocks are loaded
with a rated current of +10%, the
maximum heating is 45 K acc. to EN
60079-7:2007.
The material group identifies the
device’s use in specific atmospheres
G: Explosion protection for explosive
atmospheres due to gases, vapors or
fogs (G:gas)
D: Explosion protection for explosive
atmospheres due to dusts (D:dust)
p Electrical equipment
for hazardous areas are
distinguished in groups
and categories depending
on the probability of an
explosion hazard.
2
Group I: Equipment for mine openings
with firedamp hazard including
their bank-head installations
Group II: Equipment installed in all
other hazardous areas,
especially in the chemical and
petrochemical industries.
Explanations of applications in hazardous areas
The device category describes the achieved safety level of the device.
Category 1 Continuous, long-term or frequent occurrence of explosive
hazard atmospheres; very high safety degree; explosive
gases may occur when the container is empty.
Category 2 Occasional occurrence of explosive hazard atmospheres;
high safety degree; especially when machines are operating.
Category 3 Rare or short-term occurrence of explosive hazard
atmospheres; normal safety degree; normally only in case of
fault.
General
¬ WKF 10/35
0344OII2 GD Ex e II
750 V 10° KEMA 01 ATEX 2087 U
600 V 65 A
14–6 AWG
w
12722 Ex e II T6 CI I Zn 1
AEx e II T6
Hot surfaces of devices or device components are possible sources of ignition and
therefore potential hazards. Depending on
the maximum surface temperature based
on the ignition temperatures of certain
gases, temperature classes are assigned to
electrical equipment of group II for all types
of protection.
DIN rail terminal blocks with protection
type “e” for increased safety are normally
assigned to temperature class T6.
Marking of the equipment:
In combination with the
markings of the Wieland terminal blocks
have the following meaning:
In addition to the ATEX approval, Wieland DIN rail terminal blocks
were approved for the indicated Ex areas by the following certificating
institutes in North America:
– UL-AEx, USA
– CSA-Ex, Canada
mark, the
O
Temperature max. surclass facetem peratur [°C]
T1 450
T2 300
T3 200
T4 135
T5 100
T6 85
II Device group
2 Category/zone
G D Material group/areas
Kema
certificate, consec. no.
U Certificate valid for
components
→ UL increased safety AEx e II T6
→ Class I, Zone 1, Ex e II T6
Ex equipment
O
Name of testing institute
…ATEX...
Year of testing,
for Class I, Zone 1, Group II C
hazardous locations
for hazardous locations
Ex i design
In Ex i applications (intrinsic circuits)
electrical equipment without voltage sources
(such as DIN rail terminal blocks) does
not require prototype test certificates and
marking.
The use of feed-through blocks in blue in
intrinsic circuits for clear distinction has
become generally accepted. The terminal
blocks meet the design of the blocks
certified according to Ex e.
Accessories:
The accessories offered
by us for the use with DIN
rail terminal blocks can
be operated according to
the ATEX directive and
are therefore listed in our
catalog.
3
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