5 External connectionsCompact PLC XC-152 05/17 MN050001ZU EN www.eaton.com 455 External connections DANGER STRAY CURRENTSLarge transient currents between the functional earthing sys-tem and the ground system of different devices may result infire or in malfunctions due to signal interference.▶ If necessary, route an equipotential bonding conductor,with a cross-sectional area that is several times larger thanthat of the cable shielding, parallel to the cable. CAUTION INTERFERENCESThe values specified in the technical data, as well as thedevice's electromagnetic compatibility (EMC), cannot be guar-anteed if the following are used: unsuitable cables, improperlyassembled and terminated cables, and/or wiring that does notconform to the applicable standards. Only use cables assem-bled and terminated by professionals.The cables being used must be assembled and terminated asrequired by the port/interface description in this document.When wiring the devices, follow all instructions regarding howto wire the corresponding port/interface. All general Directives and standards must be complied with. CAUTION NON-GALVANICALLY-ISOLATED INTERFACESThe device may be damaged by potential differences.▶ The GND terminals of all bus modules must be connected.▶ Do not connect the connector to the device or disconnect itwithout first de-energizing the system.