Elster Instromet FE230, Operating Manual

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Elster-Instromet GmbH Function Expansion Unit FE230
english 5
3 Installation
!
The terminals of the FE230 are freely accessible on opening the housing. To avoid
damage to the device, it must be ensured that no electrostatic discharge (ESD)
from persons via the FE230 can occur.
To prevent this, the installer should discharge himself by touching an earthed
metallic object directly before connecting a cable.
The FE230 is approved according to [DIN] EN 50020 as “associated electrical equipment”
with three intrinsically safe electrical circuits (see Chapter ). If an intrinsically safe device is
connected to them (e.g. an EK260 volume corrector) which is located in the area subject to
explosion hazards, then the appropriate regulations must be followed. The implications of
this include:
!
Follow the stipulations in the relevant regulations and standards, in particular [DIN]
EN 60079-14 (VDE 0165 Part 1).
!
Make sure that the limits quoted in the certificate of conformance (Chapter A-2) do
not exceed the limits quoted in the certificate of conformance for the intrinsically
safe device to be connected.
!
Only cable may be used for the intrinsically safe electrical circuits which fulfils the
following requirements according to [DIN] EN 60079-14, Section 12.2.2.1:
- Insulated cables with a proof voltage of at least 500 VAC between conductor-
earth, conductor-screen and screen-earth.
-
If fine-stranded conductors are used, the conductor ends must be protected
against splaying out, e.g. by the use of wire-end sleeves.
- The diameter of individual conductors as well as single wires in fine-stranded
conductors must not be less than 0.1 mm.
Furthermore all other relevant requirements in [DIN] EN 60079-14 must be fulfilled.
For reasons of electromagnetic compatibility (EMC), screened cable must be used and the
screen connected flat on the metal cable entry of the volume corrector. In this respect,
labelling of the cables or a special sheath colour is not necessary according to [DIN] EN
60079-14, Sect. 12.2.2.6.