Lincoln Electric 718118 Spirit II 400 - Manual (Page 145)

Spirit II User’s Manual Appendix A: Electromagnetic Compatibility (EMC)
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A-3
Equipotential Bonding
Bonding of all metallic components in the plasma cutting installation and adjacent to it
should be considered. However, metallic components bonded to the workpiece will
increase the risk that the operator could receive a shock by touching these metallic
components and the electrode at the same time. The operator should be insulated from
all such bonded metallic components.
Earthing of the Workpiece
Where the workpiece is not bonded to earth for electrical safety, nor connected to earth
because of its 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 a 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.
Screening and Shielding
Selective screening and shielding of other cables and equipment in the surrounding
area may alleviate problems of interference. Screening of the entire welding installation
may be considered for special applications.