Mitsubishi Electric GOT SIMPLE Series Operation Manual page 58

■Treatment of the power cable and the ground cable
Twist the ground cable led from the ground point with the power cable.
Twisting with the ground cable relieves more noise from the power cable to the ground.
When a noise filter is installed to the power cable, twisting the power cable and the ground cable may not be required.
6 EMC DIRECTIVE
56
6.2 EMC Directive Requirements