4
ELECTRICAL CONNECTIONS
10
ESK4... ...
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10/2017 - 4001078703 - AD ESK4 Ex II2G R03 en
4.1 General notes
The electrical connection of the intrinsically safe signal circuit with protection level "ia" to the
modules ESK4... , ESK4-FF and ESK4-PA is independent of polarity.
The connection of the ESK4-I/O module is polarity sensitive.
The connection to all modules is made by colour-coded pluggable connection terminals. The
colour coding of the terminals must be observed. The permissible maximum values of the
separate circuits (electrical data) must be observed.
The connecting cables must be selected according to prevailing installation standards
(e.g. EN 60079-14). The connecting cables must be fixed and laid so they are sufficiently
protected against damage.
All cores that are not used must be securely connected to the ground potential of the hazardous
area or carefully insulated against each other and against ground (test voltage
≥
500 V
eff
).
4.2 Power supply
Electronic signal outputs do not require a separate power supply. The required supply is
provided via the 4...20 mA current output or bus-connection.
4.3 Internal connections
All modules should be connected internally using the ribbon cables provided. These are non-
interchangeable and protected against reverse polarity.
