Stahl 8146/1 User manual

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Operating instructions
Additional languages www.stahl-ex.com
EN
Terminal Boxes
Series 8146/1,
Series 8146/2
– Save for future use! –

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Terminal Boxes
Series 8146/1, Series 8146/2
Contents
1 General Information ............................................................................................3
1.1 Manufacturer .......................................................................................................3
1.2 About these Operating Instructions .....................................................................3
1.3 Further Documents .............................................................................................3
1.4 Conformity with Standards and Regulations .......................................................3
2 Explanation of the Symbols ................................................................................4
2.1 Symbols in these Operating Instructions ............................................................4
2.2 Symbols on the Device .......................................................................................4
3 Safety ..................................................................................................................5
3.1 Intended Use .......................................................................................................5
3.2 Personnel Qualification .......................................................................................5
3.3 Residual Risks ....................................................................................................6
4 Transport and Storage ........................................................................................8
5 Product Selection, Project Engineering and Modification ...................................8
5.1 Additional Through Holes in Flange Plates .........................................................9
5.2 Additional Through Holes in the Enclosure with
an internal Brass or Flange Plate ......................................................................10
5.3 External Attached Components
(Cable Entries, Stopping Plugs, Breathers) ......................................................13
5.4 Internal Built-In Components
(Conductors, Terminals, Fuses) ........................................................................14
6 Mounting and Installation ..................................................................................17
6.1 Mounting / Dismounting, Operating Position .....................................................17
6.2 Installation .........................................................................................................18
7 Commissioning .................................................................................................21
8 Maintenance and Repair ...................................................................................21
8.1 Maintenance .....................................................................................................21
8.2 Maintenance .....................................................................................................21
8.3 Repair ...............................................................................................................21
9 Returning the Device ........................................................................................21
10 Cleaning ............................................................................................................22
11 Disposal ............................................................................................................22
12 Accessories and Spare Parts ...........................................................................22
13 Annex A ............................................................................................................23
13.1 Technical Data ..................................................................................................23
14 Annex B ............................................................................................................26
14.1 Dimensions / Fastening Dimensions .................................................................26

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General Information
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Terminal Boxes
Series 8146/1, Series 8146/2
1 General Information
1.1 Manufacturer
R. STAHL Schaltgeräte GmbH
Am Bahnhof 30
74638 Waldenburg
Germany
Phone: [phone]
Fax: [phone]
Internet: www.stahl-ex.com
E-Mail: [e-mail]
1.2 About these Operating Instructions
Read these operating instructions, especially the safety notes, carefully before use.
Observe all other applicable documents (see also section 1.3).
Keep the operating instructions throughout the service life of the device.
Make the operating instructions accessible to operating and maintenance personnel at all
times.
Pass the operating instructions on to each subsequent owner or user of the device.
Update the operating instructions every time you receive an amendment to them from
R. STAHL.
ID-No.: 137189 / 8146619300
Publication Code: 2016-11-10·BA00·III·en·06
The original instructions are the German edition.
They are legally binding in all legal affairs.
1.3 Further Documents
• Data sheet
• EU Type Examination Certificate
For documents in additional languages, see www.stahl-ex.com.
1.4 Conformity with Standards and Regulations
• Certificates and EU Declaration of Conformity: www.stahl-ex.com.
• The device has IECEx approval. See IECEx homepage: http://iecex.iec.ch/

Explanation of the Symbols
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Terminal Boxes
Series 8146/1, Series 8146/2
2 Explanation of the Symbols
2.1 Symbols in these Operating Instructions
2.2 Symbols on the Device
Symbol Meaning
Tip for making work easier
DANGER! Dangerous situation which can result in fatal or severe injuries
causing permanent damage if the safety measures are not
complied with.
WARNING! Dangerous situation which can result in severe injuries if the
safety measures are not complied with.
CAUTION! Dangerous situation which can result in minor injuries if the
safety measures are not complied with.
NOTICE! Dangerous situation which can result in material damage if the
safety measures are not complied with.
Symbol Meaning
05594E00
CE marking according to the currently applicable directive.
02198E00
According to marking, device certified for hazardous areas.

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Safety
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Terminal Boxes
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3 Safety
The device has been manufactured to the state of the art while observing recognised
safety-related rules. When using the device, it is nevertheless possible for hazards to occur
to life and limb of the user or third parties or for the device, environment or material assets to
be compromised.
Use the device only
- if it is not damaged
- as intended, while remaining aware of safety and dangers
- in accordance with these operating instructions.
3.1 Intended Use
The terminal boxes 8146/1 and /2 are used to distribute electric energy and / or electric
signals in hazardous areas. They are explosion-protected equipment certified for use in
hazardous areas of Zones 1, 2, 21 and 22.
The terminal boxes are manufactured in various sizes and can be combined to create larger
distribution units. They must be installed so they are stationary.
Intended use includes observing these operating instructions and the other applicable
documents, e.g. the data sheet. Any other use of the terminal boxes is not intended.
3.2 Personnel Qualification
Qualified specialist personnel are required to perform the activities described in these
operating instructions. This primarily applies to work in the following areas:
• Product selection, project engineering and modification
• Mounting/dismounting the device
• Installation
• Commissioning
• Maintenance, repair, cleaning
Specialists who perform these tasks must have a level of knowledge that meets applicable
national standards and regulations.
Additional knowledge is required for tasks in hazardous areas! R. STAHL recommends
having a level of knowledge equal to that described in the following standards:
•IEC/EN 60079-14 (Electrical installations design, selection and erection)
•IEC/EN 60079-17 (Inspection and maintenance of electrical installations)
•IEC/EN 60079-19 (Equipment repair, overhaul and reclamation)

Safety
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Terminal Boxes
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3.3 Residual Risks
3.3.1 Explosion Hazard
An explosion hazard cannot be entirely ruled out in hazardous areas despite the device
having a state-of-the-art design.
Perform all work steps in hazardous areas with the utmost care at all times!
Possible moments of danger (residual risks) can be categorised according to the following
causes:
Mechanical damage
The device can be pressed or scratched during transport, mounting or commissioning,
causing it to no longer be leak-tight. Such damage can, for example, render the device's
explosion protection partially or fully ineffective. This can result in explosions causing fatal or
severe injuries to persons.
Observe the weight and the maximum load-bearing capacity of the device;
see specifications on the packaging.
Transport the device only in the original packaging or in equivalent packaging.
Use transporting or lifting equipment which is suitable for the size and weight of the device
and can reliably carry the weight of the device.
Check the packaging and the device for damage. Report any damage to R. STAHL
immediately.
Store the device in the original packaging in a dry (no condensation) and stable position
which is safe from vibrations.
Do not damage the enclosure, built-in components or seals during mounting.
Excessive heating or electrostatic charge
Subsequently modifying the device, operating it outside of permitted conditions or failing to
clean it properly can cause it to heat up excessively or to become electrostatically charged,
causing it to produce sparks. This can result in explosions causing fatal or severe injuries to
persons.
Operate the device only within the prescribed operating conditions
(see the type plate and the "Technical data" chapter).
Only allow the manufacturer to paint the device and have this company coat it with special,
conductive paint.
Equip devices used outdoors in the elements with a protective roof or wall.
Regularly inspect the device for a material change (plastic). If any changes are identified,
test or replace the device.
Do not paint the device. Have all repairs performed by the manufacturer.
Comply with the area specification of EN IEC 60079-0 when fitting additional plastic
adhesive labels.
Clean the device only with a damp cloth.

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Safety
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Terminal Boxes
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Impairment of IP protection
When installed properly and completely, the device will have the required IP degree of
protection. Making structural changes to the device or mounting it improperly can impair its
IP protection. This can result in explosions causing fatal or severe injuries to persons.
Only apply labels (on the outside) without drilling any additional holes.
Only drill holes for cable glands exactly according to the instructions in the
"Product selection, project engineering and modification" and "Mounting" chapters of
these operating instructions. Consult with R: STAHL first if there are any discrepancies or
uncertainties.
Mount the device only in the prescribed mounting position. More detailed explanations of
this can be found in the "Mounting" chapter.
Improper installation, commissioning, maintenance or cleaning
Basic work such as installation, commissioning, maintenance or cleaning of the device must
be performed only in accordance with the valid national regulations of the country of use and
only by qualified persons. Otherwise the explosion protection can be rendered ineffective.
This can result in explosions causing fatal or severe injuries to persons.
Have mounting, installation, commissioning and maintenance performed only by qualified
and authorised persons (see section 3.2).
Only make changes to the device in accordance with the instructions in these operating
instructions. Have R. STAHL or a test body (3rd party inspection) carry out acceptance.
Perform maintenance and repairs on the device only using original spare parts and after
consultation with R. STAHL.
Gently clean the device only with a damp cloth and without scratching, abrasive or
aggressive cleaning agents or solutions.
Never clean the device with a strong water jet, e.g. using a high-pressure washer!
3.3.2 Risk of Injury
Falling devices or components
The heavy device or components can fall during transport and mounting, causing severe
injury to persons in the form of bruises and contusions.
Use transporting and lifting equipment suitable for the size and weight of the device when
transporting and mounting it.
Observe the weight and the maximum load-bearing capacity of the device;
see specifications on the packaging.
Use suitable mounting hardware for mounting.
Electric shock
During electric installation, operation and maintenance, there will at times be high voltages
present at the device. Persons coming into contact with electric lines carrying excessively
high voltage can suffer severe electric shocks and consequently injuries.
Operate the device only on equipment with the internal voltage specified in the
"Technical data" chapter.
Connect electric circuits only to suitable terminals.

Transport and Storage
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Terminal Boxes
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4 Transport and Storage
Transport and store the device carefully and in accordance with the safety notes
(see "Safety" section).
5 Product Selection, Project Engineering and Modification
When complying with the installation conditions and specifications on the type plate:
Check whether enough cable entries are provided. Drill additional holes if necessary;
see sections 5.1 to 5.2.
Equip terminals and, if necessary, mount built-in components; see section 5.4.
The methods mainly considered for modification are subsequently machining or equipping
the terminal box. In this case, the following possibilities are available:
• Additional through holes on the flange plate, either by R. STAHL or by the customer
(section 5.1)
• Additional through holes in the enclosure, either by R. STAHL or by the customer
(section 5.2)
• External attached components either by R. STAHL or by the customer (section 5.3)
• Internal built-in components either by R. STAHL or by the customer (section 5.4)
DANGER! Explosion due to subsequent, complete painting of the device!
Non-compliance results in fatal or severe injuries.
Do not paint the device.
Have all repairs performed by the manufacturer.
DANGER! Explosion due to defective sealing of the device!
Non-compliance results in fatal or severe injuries.
Only apply labels (on the outside) without drilling any additional holes.
Only create additional drilled holes specifically in accordance with the instructions
in the "Mounting" chapter. Consult R. STAHL in the event of deviations or
uncertainties.
Equip the enclosure only with equipment (e.g. cable entries, stopping plugs,
drain and breather valves) that is verifiably approved for use in hazardous areas.
Examples: EU Type Examination Certificate or IECEx Certificate of Conformity
Seal any unused cable entries with the stopping plugs approved for the type of
protection.
Seal all open drilled holes by means of suitable equipment.
Acceptance of work performed in-house must be carried out in accordance with national
regulations. Otherwise, you must have R. STAHL or a test body (3rd party inspection)
(section 3.3.1) carry out acceptance. On request, R. STAHL can carry out this work if
offered appropriate remuneration. If the work is carried out by R. STAHL, no additional
acceptance is necessary.

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Terminal Boxes
Series 8146/1, Series 8146/2
5.1 Additional Through Holes in Flange Plates
5.1.1 Creation of Additional Drilled Holes and Through Holes by R. STAHL
Forward the following information to R. STAHL:
-Type
- Data sheet
- Quantity, manufacturers and approvals of the components that are to be installed.
R. STAHL
• will check whether the components, drilled hole diameters, quantity and position
correspond with the approval
• will create the drilled holes and through holes
• will mount the components
• will update the order documentation
• will carry out a routine test
• will, if necessary, fit a new type plate if the technical data has changed,
e.g. due to the components that are to be additionally installed.
5.1.2 Ascertaining the usable Area for Cable Entries in Flange Plates
All dimensions in mm [inches]
18495E00
Collision frame and earth connection of flange plate
Select a space/area for the cable entry on the flange plate anywhere inside the collision
frame (see thin line in figure). Ensure that screw connections made later do not go beyond
this collision frame.
Observe the following conditions when doing so:
Leave enough distance to the circumferential seal (min. 3 mm)
(see detail in figure).
312[0, ]
312[0, ]

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Terminal Boxes
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5.1.3 Creation of Additional Drilled Holes and Through Holes by the Customer
Modify the device carefully and only in accordance with the safety notes
(see "Safety" section).
Calculate the usable area, see section 5.1.2.
Create additional through holes by lasing or punching (drilling, hole cutting).
When punching and cutting, make sure that the outer surfaces of the enclosure remain flat
and undamaged (without cracks).
Determine the core hole diameter for threads. Do not use an NPT thread!
When determining the through holes, observe the mounting distances.
Adjust the hole diameters to the dimensions of the built-in parts or their seals.
ONLY use built-in components with flat seal (gasket).
Observe section 5.3 when subsequently equipping components!
5.2 Additional Through Holes in the Enclosure with an internal Brass or Flange Plate
5.2.1 Creation of Additional Drilled Holes and Through Holes by R. STAHL
Give the following information to R. STAHL:
-Enclosure side
-Type
- Data sheet
- Quantity, manufacturers and approvals of the components that are to be installed.
R. STAHL
• will check whether the components, drilled hole diameters, quantity and position
correspond with the approval
• will create the drilled holes and through holes
• will mount the components
• will update the order documentation
• will carry out a routine test
• will, if necessary, fit a new type plate if the technical data has changed,
e.g. due to the components that are to be additionally installed.
Terminal boxes which the customer wants delivered without drilled holes are generally
marked as empty enclosures with the corresponding type plate (marking in accordance
with EN IEC 60079-7 and EN IEC 60079-0, as incomplete equipment "U" inside the
enclosure).

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Terminal Boxes
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5.2.2 Creation of Additional Drilled Holes and Through Holes by the Customer
Modify the device carefully and only in accordance with the safety notes
(see "Safety" section).
Calculate the usable area for built-in components, see sections 5.1.2 and 5.2.2.
Create additional through holes by lasing or punching (drilling, hole cutting).
When doing so, maintain a distance of min. 10 mm to the rim of the enclosure
(see figure).
All dimensions in mm [inches]
18478E00
When punching and cutting, make sure that the outer surfaces of the enclosure remain flat
and undamaged (without cracks).
When determining the through holes, observe the mounting distances.
Adjust the hole diameters to the dimensions of the built-in parts or their seals.
ONLY use built-in components with flat seal (gasket).
Observe section 5.3 when subsequently equipping components!
5.2.3 Creation of Additional Drilled Holes and Through Holes in the Enclosure with Flange Plate by
R. STAHL
Give the following information to R. STAHL:
-Enclosure side
-Type
- Data sheet
- Quantity, manufacturers and approvals of the components that are to be installed.
R. STAHL
• will check whether the components, drilled hole diameters, quantity and position
correspond with the approval
• will create the drilled holes and through holes
• will mount the components
• will update the order documentation
• will carry out a routine test
• will, if necessary, fit a new type plate if the technical data has changed,
e.g. due to the components that are to be additionally installed.
10 [0,39]
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10 [0,39]
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Terminal Boxes
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5.2.4 Creation of Additional Drilled Holes and Through Holes in the Enclosure with Flange Plate by
the Customer
Modify the device carefully and only in accordance with the safety notes
(see "Safety" section).
Calculate the usable area for built-in components, see sections 5.1.2 and 5.2.2.
Select a space/area for the cable entry on the flange plate anywhere inside the collision
frame (see thin line in figure). Ensure that screw connections made later do not go beyond
this collision frame. Leave enough distance (min. 15 mm) to the circumferential frame
(see the figure for the "Collision frame" section).
All dimensions in mm [inches]
18479E00
When punching and cutting, make sure that the outer surfaces of the enclosure remain flat
and undamaged (without cracks).
When determining the through holes, observe the mounting distances.
Adjust the hole diameters to the dimensions of the built-in parts or their seals.
ONLY use built-in components with flat seal (gasket).
Observe section 5.3 when subsequently equipping components!
1 [0, 9]55
1 [0, 9]55
1 [0, 9]55
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Terminal Boxes
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5.3 External Attached Components
(Cable Entries, Stopping Plugs, Breathers)
5.3.1 Fitting of Attached Components by R. STAHL
Give the following information to R. STAHL:
-Type
- Data sheet
- Quantity, manufacturers and approvals of the components that are to be attached.
- Type of protection
R. STAHL
• will check whether the components, quantity and position correspond with the approval
• will mount the components
• will update the order documentation
• will carry out a routine test
• will, if necessary, fit a new type plate if the technical data has changed,
e.g. due to the components that are to be additionally attached.
5.3.2 Fitting of Attached Components by the Customer
Selecting material
It is advisable to use the following materials when equipping the terminal box:
Cable entry
• for electric lines which are permanently installed: Plastic or metal cable entries for electric
lines which are permanently installed
• for electric lines which are not permanently installed: Plastic or metal cable entries with
strain relief.
Sealing unused entries
• Use plastic or metal stopping plugs according to the type of protection.
Drainage and pressure equalisation (prevention of the vacuum effect)
• Plastic or metal breather valves.
Equip the device carefully and in accordance with the safety notes (see "Safety" section).
Observe the specifications on the type plate of the device for the selection and operating
temperature of the components and seals.
Calculate the usable area for attached components; see sections 5.1.2 and 5.2.2.
Adjust the hole diameters of drilled holes to the dimensions of the built-in parts or their
seals!
The use of attached components with flat seal (gasket) is preferred.
Drilled holes and through holes are generally already equipped with the components
intended for the application ex-factory.
If customers intend to carry out equipping themselves, dust and transport protection is
applied to the openings in the enclosure (adhesive tape with a warning note or plastic
caps) ex-factory.

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5.4 Internal Built-In Components
(Conductors, Terminals, Fuses)
Ascertaining the maximum number of conductors
5.4.1 Ascertain the Number of Conductors using the Table from the
EU Type Examination Certificate
Refer to the specifications in the EU Type Examination Certificate for the maximum
permitted number of conductors in relation to the current load and conductor
cross-section.
Taking enclosure 8146/1061 as an example: The maximum permitted number of conductors
can be ascertained using the following table.
06219E00
*) Current, **) conductor cross-section
Explanations of the table:
Each inserted conductor and each internal connection conductor must be counted.
Jumpers and protective conductors are not considered conductors.
Non-critical area (light area of the table)
The light area is non-critical in terms of heating up the enclosure. Circuits classified as being
in this area can be incorporated in the enclosure in any number.
Heat develops in every terminal box due to contact resistance at the terminals and the
cables installed in the enclosure. In order to ensure that the maximum permissible
temperatures of a terminal box are not exceeded, care should be taken that the current
load of the circuits installed in the terminal box does not exceed certain values!

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Terminal Boxes
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Critical (inscribed area of the table)
The part of the table shows the maximum permissible number of conductors considering the
cross-sections of the conductors and the continuous current loading. When using this table,
simultaneous factors and load factors may be accounted for. Mixed arrangements with
circuits of different cross-sections and currents are possible; in this case the proportion of
the loading from the individual circuits should be taken into account. If a terminal box is fully
loaded according to the criteria in the dark part of the table, then any number of circuits from
the non-critical (light part of the table) may be added.
Dangerous (dark area of the table)
Terminal boxes which are designed according to this area require an additional
temperature-rise test.
Example calculation (general):
Ensure that operating temperatures of the terminal box and the selected electric lines
(in particular low temperatures) match.
5.4.2 Additional Terminals
Fitting of additional terminals by R. STAHL
Forward the following information to R. STAHL:
-Type
- Manufacturer
- Data sheet
- Quantity
-Enclosure size
R. STAHL
• will check whether the terminal type, quantity, cross-section and current load correspond
with the approval
• will check whether the enclosure size, drilled holes and through holes are sufficient
• will install the terminals
• will, if necessary, create required drilled holes and fit required cable entries
• will update the order documentation
• will carry out a routine test
• will, if necessary, fit a new type plate if the technical data, such as current or conductor
cross-section, has changed.
Cross-section [mm2]Current [A] Number of conductors Proportion
2.5 20 8 (of 20) = 40 %
4 25 6 (of 22) = 27 %
6 35 4 (of 17) = 24 %
= 91 % < 100 %

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Terminal Boxes
Series 8146/1, Series 8146/2
Fitting of additional terminals by the customer
Modify the device carefully and only in accordance with the safety notes
(see "Safety" section).
Ascertain additional terminal points, terminal type, quantity, cross-section and current
load.
Check whether type plate data is changed as a result of subsequently equipping
(cross-section, voltage, current, etc.).
Check whether enough space and fastening options are available for equipping.
5.4.3 Fuses
When fitting fuses, the ambient temperature values for the following temperature classes
apply:
When fitting fuses, the ambient temperature values for areas with dust explosion hazard for
the following max. permissible surface temperatures apply:
Subsequent equipping is not permitted if the installation conditions are not complied with!
Installing, modifying or retrofitting fuses is only permitted to be performed by R. STAHL!
Fuse current value Temperature class
( 4 A T6
> 4 A to ( 5 A T5
> 5 A to ( 6.3 A T4
Fuse current value Ambient temperature
(Ta)
Max. permissible surface
temperature
( 4 A ( 40 °C T80°C
( 4 A ( 56 °C T95°C
( 5 A ( 46 °C T95°C
( 6.3 A ( 70 °C T130°C

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Terminal Boxes
Series 8146/1, Series 8146/2
6 Mounting and Installation
6.1 Mounting / Dismounting, Operating Position
Mount the device carefully and only in accordance with the safety notes
(see "Safety" section).
Read through the following installation conditions and assembly instructions carefully and
follow them precisely.
6.1.1 Operating Position
Mount the device using the mounting straps. Refer to the dimensional drawing for the
dimensions of the mounting holes.
16523E00
Alignment of enclosure depending on mounting type:
• For vertical mounting: any alignment
• For horizontal mounting: cover on top
• Hanging position/overhanging cover is not permitted!
6.1.2 Environmental Installation Conditions
Provide a protective roof or wall if the explosion-protected device is exposed to weather.
Equip explosion-protected electric equipment with a breather and drain valve in order to
prevent the vacuum effect. Observe the correct mounting orientation (bottom) when doing
so. See also section 6.1.1
Do not create any cold bridges (risk of condensation). If necessary, mount the enclosure
with a clearance to reduce condensation in the enclosure to a minimum.
DANGER! Explosion due to incorrect mounting position!
Non-compliance results in fatal or severe injuries.
Mount the device only on the floor or wall, not overhead or in a free-standing
position.
Mount the device torsion-free only on a level surface.
≦ 90°

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Terminal Boxes
Series 8146/1, Series 8146/2
6.2 Installation
6.2.1 Conductor Connection
Select suitable conductors that do not exceed the permitted heating temperature within the
enclosure.
Ensure that conductors have the specified cross-sections.
Guide the conductor insulation so that it reaches the terminals.
Do not damage the conductor when stripping the insulation (e.g. by denting it).
Attach the core end sleeves properly.
If the system is equipped with all possible terminals and live conductors, and and the
maximum current load has been reached, ensure that the length of a conductor from the
screw connection to the terminal point does not exceed the diagonal planes of the
enclosure.
Operation under difficult conditions, such as on ships or in strong sunlight, requires
additional measures to be taken for correct installation, depending on the place of use.
Further information and instructions on this can be obtained from your regional sales
contact on request.
DANGER! Explosion due to excess heating inside the enclosure!
Non-compliance results in fatal or severe injuries.
Ensure that distances between Ex e electric circuits and Ex i electric circuits comply
with standards (EN IEC 60079-11).
Select suitable conductors that do not exceed the permitted heating temperature
within the enclosure.
Pay attention to the specified cross-sections.
Attach the core end sleeves properly.
DANGER! Explosion due to improper installation!
Non-compliance results in fatal or severe injuries.
Install the device carefully and only in accordance with the safety notes
("Safety" section).
The installation steps stated below must be carried out very precisely.
The necessary technical details/data on electric installation can be found in the following
documents:
"Technical data" chapter in these operating instructions
Documentation and data sheets provided by the terminal manufacturers
Documentation and data sheets of the installed devices (e.g. for specifications on
equipotential bonding, earthing and intrinsically safe circuits)

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Terminal Boxes
Series 8146/1, Series 8146/2
6.2.2 Installation Conditions
Installation conditions for creepage distances and clearances
Distances, creepage distances and clearances
When installing components, the creepage distances and clearances between the
individual components, as well as between the components and the enclosure walls,
must be sufficiently dimensioned. Observe the values from the EN IEC 60079-7 standard
(table) when doing so.
Check the creepage distances of the components and comply with them in accordance
with the specifications in the respective operating instructions.
The clearance distances, depending on the rated operational voltage of the fitted
terminals, must be complied with.
Observe the distance between the enclosure cover and connection screws of the built-in
components (with the conductor connected): at least the value of the required clearances.
18591E00
I = Minimum distance from the
enclosure in accordance with
EN IEC 60079-7 standard (table)
y = Clearance
X = Factor in accordance with
EN IEC 60079-7 depending on
conductor cross-section
18590E00
X * I = Minimum distance
18592E00
18593E00
m = 50 mm distance between Ex e and
Ex i terminal blocks
c = 8 mm distance between Ex e and
Ex i cable lines
II
II
X I
*
y
I
I
m
c

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Terminal Boxes
Series 8146/1, Series 8146/2
Distance between the connecting units for intrinsically safe and non-intrinsically safe circuits
Mount partitions used to separate connection terminals at least 1.5 mm from the enclosure
walls, or alternatively ensure a minimum distance of 50 mm between the uncoated
conducting parts of the connection terminals (when measured in any direction around
the partition)
Make sure that metallic partitions
• are at least 0.45 mm thick
• are earthed
• are sufficiently strong and rigid
• have sufficient current carrying capacity.
Make sure that non-metallic, insulating partitions
• are at least 0.9 mm thick
• have an appropriate comparative tracking index (CTI)
• are reinforced to prevent deformation.
When using fuses > 4 A, implement additional design measures to prevent impermissible
heat-up at the terminals of the intrinsically safe circuits.
Covers for combinations of non-intrinsically safe and intrinsically safe circuits
Equip all live parts which are not acc. to "Ex i" protection with an inner cover which meets
at least the degree of protection IP30 when the equipment is open.
Intrinsically safe circuits
In intrinsically safe circuits, use only insulated cables and conductors with a test voltage
of at least 500 V AC and a minimum quality of H05.
Calculate the insulation test voltage for the insulation and separation of terminals and
conductors from the sum of the rated operational voltages of intrinsically safe and
non-intrinsically safe circuits.
• In case of "intrinsically safe to earth", there is a minimum rated insulation voltage value
of 500 V (otherwise, double the value of the rated operational voltage of intrinsically
safe circuits).
• In the case of "intrinsically safe to non-intrinsically safe", there is a minimum rated
insulation voltage value of 1500 V (otherwise, double the rated operational voltage plus
1000 V).
Clearance and creepage distances of intrinsically safe components
Make sure that the creepage distances and clearances between the uncoated,
conductive parts of connection terminals of separated, intrinsically safe circuits to earthed
or potential-free, conductive parts is equal or greater than the values of EN IEC 60079-11,
Table 5.
For separated, intrinsically safe electric circuits, set up a safe distance between the
uncoated, conductive parts of external connections, which meets the following
requirements:
• minimum 6 mm between the separated, intrinsically safe circuits
• minimum 3 mm to earthed parts if possible connection to earth has not been considered
in the safety analysis.