In France, metallic cable trays cannot be used as PE conductors.
Please check local norms and regulations.
Therefore, the cable trays circuits must be connected to earth* in order to better equipotential bonding and make sure no electromagnetic disturbance will occur.
This can be done thanks to earthing bolts, clamps or earth strap.
*UTE C 15-900 22.214.171.124 : connect to earth every 15 metres or at each end if length is less than 15 metres
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