2
0
1
8
-1
2
44
Installation
Installing field wiring for non-intrinsically safe circuits
Non-intrinsically safe circuits must be covered with protective covers for Ex e modules.
1. The I/O modules are wired differently depending on the type. Wire the terminal blocks to the
field devices in accordance with the information in the datasheets for the I/O modules used.
2. Note the permissible core cross section of the conductor. We recommend that you do not
exceed a conductor cross section of 0.75 mm
2
.
3. If you are using stranded conductors, crimp the stranded conductors with wire end ferrules.
4. Make sure that the insulation on the conductors extends all the way to the terminal.
5. Use only black type LB9109.E.6.1, LB9109.E.8.1, and LB9109.E.8.2 terminal blocks and
protective covers for type LB9107.E.6 and LB9107.E.8 Ex e modules.
Figure 3.18
Spring terminal with protective cover for Ex e modules
6. Make sure that the separation distances to intrinsically safe circuits are observed.
7. Unused cables and connection lines must be either connected to terminals, securely fixed
and isolated, or grounded.
8. If necessary, code the front sockets of the I/O modules and terminals so that the terminals
and the associated field devices can be assigned to exactly one front socket.
9. Plug the terminals into the front sockets of the corresponding I/O modules and screw the
terminals into place using the side screws.
10.Break off the lugs of a protective cover for Ex e modules at the points where the field lines
lead into the terminal openings. Unused terminal openings must remain covered by the lugs
of the protective cover so that no bare, conductive parts are exposed.
Danger!
Explosion hazard when removing the protective caps
If intrinsically safe and non-intrinsically safe circuits are present, removing the protective cap in
a potentially explosive atmosphere can create sparks that can ignite the surrounding
atmosphere.
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Only remove the cover when not located in a potentially explosive atmosphere.
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Only remove the cover if the non-intrinsically safe circuits are de-energized (no voltage or
current). Remove the I/O module or switch off the circuit using the multifunction terminal.
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Cover all the unused terminal ports.
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If the field wiring is changed and lines for which lugs have already been broken off from
the protective cover are removed, you must replace the protective cover with a new one.
