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Can we use cable shielding as PE conductor for motor connection to PE bar?

NEVER !

The standards related to protection people against electric shocks does not allow to use screen or shielding as protective earth (PE). In TN network, the PE conductor must have certain minimum cross-section (depends on the device power) in order to tirgger upstream fuse or breaker trip when electric fault occurs. In TN network all devices except devices with double insulation (marked with 2 squares) must be connected to PE.

Shielding of the cable represents grounding for EMC, but never as PE function
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