Tweco 186 DC Inverter - Manual (Page 34)

INSTALLATION, OPERATION AND SETUP 3-4 Manual 0-5237
186 AC/DC INVERTER INSTALLATION/SETUP
7. The time of day that welding or other activities are to be carried out.
8. The immunity of other equipment in the environment: the user shall ensure that other equipment being used
in the environment is compatible: this may require additional protection measures.
The size of the surrounding area to be considered will depend on the structure of the building and other activities
that are taking place. The surrounding area may extend beyond the boundaries of the premises.
C. Methods of Reducing Electromagnetic Emissions
1. Electricity Supply
Welding equipment should be connected to the Electricity Supply according to the manufacturer’s
recommendations. If interference occurs, it may be necessary to take additional precautions such as filtering
of the Electricity 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. 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.
3. Welding Cables
The welding cables should be kept as short as possible and should be positioned close together but never
coiled and running at or close to the floor level.
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/grounding of the Work Piece
Where the work piece 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 work piece to earth may reduce
emissions in some, but not all instances. Care should be taken to prevent the earthing of the work piece
increasing the risk of injury to users, or damage to other electrical equipment. Where necessary, the connection
of the work piece to earth should be made by direct connection to the work piece, 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.