Specifications

Transtig 200Pi, 250Pi, 300Pi
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2.3 Methods of Reducing Electromagnetic Emissions
a) Mains Supply
Welding equipment should be connected to the mains supply according to the manufacturer’s
recommendations. If interference occurs, it may be necessary to take additional precautions such
as filtering of the mains supply. Consideration should be given to shielding the supply cable of
permanently installed welding equipment in metallic conduit or equivalent.
Shielding should be electrically continuous throughout its length. The shielding should be
connected to the Welding Power Source so that good electrical contact is maintained between
the conduit and the Welding Power Source enclosure.
b) Maintenance of Welding Equipment
The welding equipment should be routinely maintained according to the manufacturer’s
recommendations. All access and service doors and covers should be closed and properly
fastened when the welding equipment is in operation. The welding equipment should not be
modified in any way except for those changes and adjustments covered in the manufacturer’s
instructions. In particular, the spark gaps of arc striking and stabilising devices should be
adjusted and maintained according to the manufacturer’s recommendations.
c) Welding Cables
The welding cables should be kept as short as possible and should be positioned close together,
running at or close to the floor level.
d) 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.
e) 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.
f) 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.