Connect the AC neutral conductor to the ground wire
Avoid using lock washers and star washers when making ground connections
Bond equipment enclosures together✓Bonne réponse
Explication
A ground loop is a difference in potential between two points that are both supposed to be ground, and it exists because the connection between them has impedance. Bonding the enclosures directly together with short heavy conductors collapses that difference so no current circulates through signal cable shields.