13
Additional
Precautions
Any welding operation undertaken in.....
-
rooms where there is an increased risk of electric shocks,
- Poorly ventilated rooms,
- In the presence of flammable or explosive material,
......should always be approved by a "responsible expert", and made in presence of
people trained to intervene in case of emergency.
Technical protection as described in the Technical Specification CEI/IEC 62081
must be implemented.
Welding in raised positions is forbidden, except in case of safety platforms use.
People wearing Pacemakers are advised to see their doctor before using this device.
Do not use the welding unit to unfreeze pipes.
Handle gas bottles with care - there is increased danger if the bottle or its valve are damaged.
RECOMMENDATION
TO
REDUCE
ELECTRO-MAGNETIC
EMISSIONS
General
The user is responsible for installing and using the welding equipment according to manufacturer’s instructions. If
electromagnetic disturbances are detected, then it shall be the responsibility of the user of the welding equipment to
resolve the situation with the technical assistance of the manufacturer.
Evaluation of the welding area
Before installing welding equipment the user shall make an assessment of potential electromagnetic problems in the
surrounding area
a.
Other wiring, power cables, telephones and communication cables; above, below and adjacent to the
welding machine
b.
Radio and television transmitters and receivers
c.
Computer and other control equipment
d.
Equipment critical for safety purposes such as safety checks of industrial equipment
e.
The health of people in the vincity, for example people wearing pacemakers and hearing aids
f.
Equipment used for calibration or measurements
g.
The affects on other equipment in the room. The user must ensure that other equipment used in the
same vicinity is compatible. This may require additional protection measures;
h.
The time of day when welding or other activities are carried out
i.
The size of the area to be considered will depend on the structure of the building and any other
processes in the area. The surrounding area may extend beyond the boundaries of the buildings.
Recommendation to reduce electro-magnetic emission
a.
Mains power supply: the equipment must be plugged to the power mains as specified in the
Manufacturer’s instructions. If interference occurs, additional measures such as filtering of the mains
supply may be required. It may be useful to shield the supply cable for permanent installations may have
to be shielded in metal conduits or similar.The shielding should be continous for the entire lengh of the
cable. It should also be connect to the welding machine with secure electrical contact between the metal
conduit and the casing.
b.
Welding cables: The welding cables should be kept as short as possible and should be positioned close
together, running at or close to floor level.
c.
Protection and reinforcement: Selective screening and shielding of other cables and equipment in the
surrounding area may alleviate problems of interference. Shielding of the entire welding area may be
considered for special applications
d.
Connect the earth directly to the workpiece to be welded: 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.
