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MI3 Rev. G Nov/2015 61
The standard data cable length to the communication box is 5 m (16 ft). In response to the
interference in the environment the length of the cable may be up to 30 m (98 ft). Use
only shielded cable with low capacitance about 100 pF/m (33pF/ft).
The following illustration shows the external wiring of the Ex Power Supply with the sensing heads,
the communication box and the mains supply.
Figure 43: External Wiring of the Ex Power Supply
To wire the mains supply, see the following section 9.2.4 Mains Supply, page 61.
For the installation of the sensing head cable and the cable for the communication box the color coding
for the individual wires needs to be considered. For the EMC compliant connection of the cable with
the grommet follow the implementation order illustrated in the figure below.
Figure 44: EMC Compliant Connection for the Cables for Sensing Heads and Communication Box
9.2.4 Mains Supply
The Ex Power Supply does not include a power switch. You must supply a mains disconnect switch.
This switch should be in close proximity to the operator and clearly marked as the power shutoff for
the equipment.
If you use a line conditioner or isolation transformer, connect it according to the manufacturer’s
instructions. Please observe grounding instructions and make sure earth ground is supplied to the
terminal block of the Ex Power Supply, see Figure 41.
All local electrical codes related to installation and grounding of electrical equipment should be
followed.
© photo courtesy of HUGRO-Armaturen GmbH
Before Installation – select local mains voltage!
Make sure to implement
a 360° shield contact
with the contact socket!
Sensing Head /
Communication Box
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