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Installation VisuNet RM and VisuNet PC
10
Installation VisuNet RM and VisuNet PC
10.1
General Instructions and Explosion Protection Requirements
Cables are only allowed to be connected when de-energized. Make sure that all terminal
compartments are tightly sealed in accordance with regulations prior to starting up the
equipment.
All cable glands must be screwed tight and checked to ensure that they are securely in
position.
The minimum clearances in air and creepage distances in the vicinity of the terminals must be
maintained; they must not be shortened by stripping the wires too far. (isolated wire end
sleeve with Imax=8mm).
The cables in the vicinity of terminal compartments (Ex e) must be fixed-
mounted.
The cables in the vicinity of the intrinsically safe terminal compartment (Ex ib)
can be flexibly laid.
10.2
External Equipotential Bonding
Explosion-protected electrical equipment in a metal case must be provided with external
equipotential bonding, which must be connected to the equipotential bonding of the system
over the shortest possible distance (cross section: min. 4mm
2
).
10.3
Cable Types and Maximum Cable Lengths
Warning!
For wiring of interfaces with the type of protection “e” increased safety the standard EN 60079-
14 has to be considered!
10.3.1
Ethernet 100BASE-TX (Ex e)
We recommend using a high-quality cable to assure a minimum of errors during Ethernet data
transmission. A large core cross-section and excellent shielding increase the permissible
cable length and reduce transmission errors, leading to a higher transmission speed.
The table below provides a rough guide to the line lengths that can be achieved with different
cable qualities.
Short name
Description
Cable length
Cat. 7
4 x 2 x AWG22 S/FTP (600 MHz)
Paired, twisted and shielded
90 m
Cat. 6e
4 x 2 x AWG22 or AWG23
S/STP or S/FTP (500 MHz)
80 m
Cat. 6
4 x 2 x AWG24 S/UTP (250 MHz)
60 to 70 m
