Electromagnetic Compatibility (EMC)
3-4 Installation Manual: PSS 3056 Series
• Data and signal lines should be laid as close as possible to an earthed
surface.
Cabling to open air systems:
• As far as possible use metal conduits. These should be electrically
connected and earthed.
• Ensure there is sufficient protection against lightning by:
- Using metal conduits earthed at both ends, or concrete cable ducts with
reinforcements connected across the joints.
Equipotential bonding
Potential differences can occur through potential connected couplings
between the safety system and peripheral devices or cable shields, which
are connected at either end and have different earth connections. In order
to avoid interference, equipotential bonding cables must be installed. In
doing so, you must ensure the following:
• Select a low impedance equipotential bonding cable.
• If the safety system and peripheral devices are connected with screened
signal cables which are earthed at either end, the impedance is
calculated as follows:
Impedance equipotential bonding cable = 10% of screen impedance.
• Select the following as standard values for the cross section of the
equipotential bonding cable:
16 mm
2
for equipotential bonding cables up to 200 m in length.
25 mm
2
for equipotential bonding cables over 200 m in length.
• Use copper or galvanised steel equipotential bonding cable.
• Connect equipotential bonding cables to the earth conductor over as
wide a surface area as possible.
• As short a distance as possible should be kept between the equipotential
bonding cable and signal cable.
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