Chapter 13 EMC Directive
13
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3
2) Connection of power and earth wires
Earthing and power supply wires for the PLC system must be connected as described below.
(1) Earth the control panel with a thick wire so that a low impedance connection to ground can be ensured even at
high frequencies.
(2) The function of LG (Line Ground) and FG (Frame Ground) terminals is to pass the noise generated in the PLC
system to the ground, so an impedance that is as low as possible must be ensured.
(3) The earthing wire itself can generate the noise, so wire as short and thick to prevent from acting as an antenna.
13.1.3 Cables
1) Extension cable connection
The extension cables contain a high frequency noise. Therefore, a ferrite core is attached to the extension cable as
shown in the picture below to meet the CE conformance.
Model Manufacturer
Remarks
CU1330D E-TECH
ELECTRONICS
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ZCAT3035-1330 TDK
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2) Cable connection method for the inside control panel
In the case that the extension cable is connected to the metal panel, a space of at least 1cm is needed from the
panel. The metal board of the control panel has a shielding effect that blocks noise, but it could be served as an
antenna when in contact with a cable which would create a noise source.
Keep all high-speed signal transmission cables at a safe distance from the metal board.
Ferrite core