Specifications

5
2. METHODS OF REDUCING EMISSIONS
2.1 MAINS SUPPLY
Welding equipment should be connected to the mains supply according to
the manufacturers 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.
2.2 MAINTENANCE OF THE WELDING EQUIPMENT
The welding equipment should be routinely maintained according to the
manufacturers 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 manufacturers instructions.
In particular, the spark gaps of arc striking and stabilizing devices should be
adjusted and maintained according to the manufacturers recommendations.
2.3 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.
2.4 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 these metallic components and the electrodes at the same time.
The operator should be insulated from all such bonded metallic components.
2.5 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. ships 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.