Tweco 200i Multi Process Welding Inverter - Manual (Page 21)

TRANSMIG 200i
Manual 0-5209 3-3 INSTALLATION, OPERATION AND SETUP
4. Equipotential Bonding
Bonding of all metallic components in the welding installation and adjacent to it should be considered.
However. Metallic components bonded to the work piece will increase the risk that the operator could
receive a shock by touching the metallic components and the electrode at the same time. The operator
should be insulated from all such bonded metallic components.
5. Earthing of the Workpiece
Where the workpiece is not bonded to earth for electrical safety, nor connected to earth because of it’s
size and position, e.g. ship’s hull or building steelwork, a connection bonding the workpiece to earth
may reduce emissions in some, but not all instances. Care should be taken to prevent the earthing of
the workpiece increasing the risk of injury to users, or damage to other electrical equipment. Where
necessary, the connection of the workpiece to earth should be made by direct connection to the
workpiece, but in some countries where direct connection is not permitted, the bonding should be
achieved by suitable capacitance, selected according to national regulations.
6. Screening and Shielding
Selective screening and shielding of other cables and equipment in the surrounding area may alleviate
problems of interference. Screening the entire welding installation may be considered for special
applications.