Local grounding

In addition to the grounding system for the entire system, expanded systems in a plant must also be equipped with local grounding for devices and machines to ensure a good equipotential bonding. The local grounding systems are connected to the plant grounding system.

Guidelines for local grounding

The following guidelines should be observed to achieve a good local equipotential bonding:

• An unbroken link (daisy chaining) should be made between all metal device and machine structures:

  • Switching cabinet

  • Earth plane plate on cabinet floor

  • Cable duct

  • Pipe and sheathed cable lines

  • Supporting components and metal chassis from machines, motors etc.

• Special earth conductors may be required to complete the ground connection.

  Example: Both ends of a cable conductor which is not used are connected to ground.

• The local ground connection must be connected to the main system network, whereby a maximum number of distributed ground connections should be made.