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1.1 ELECTROMAGNETIC COMPATIBILITY
The user is responsible for installing and using the arc welding equipment according to the manufacturer's
instructions. If electromagnetic disturbances are detected, then it shall be the responsibility of the user of the arc welding
equipment to resolve the situation with the technical assistance of the manufacturer. In some cases, this action may be
as simple as connecting to earth the welding circuit. In other cases, it could involve constructing electromagnetic
screens enclosing the welding power source and the work complete with associated input filters. In all cases,
electromagnetic disturbances shall be reduced to the minimum to avoid troubles.
Before installing arc welding equipment, the user shall assess potential electromagnetic problems in the
surrounding area. The following shall be considered:
a) Supply cables, control cables, signalling and telephone cables, above, below and adjacent to the arc welding
equipment.
b) Radio and television transmitters and receivers.
c) Computer and other control equipment.
d) Safety critical equipment, e.g. guarding of industrial equipment;
e) The health of the people around, e.g. the use of pacemakers and hearing aids;
f) Equipment used for calibration or measurement.
g) 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.
h) The hour of day when welding or other activities are to be carried out.
1.1.1 Methods of reducing emissions
Connection to mains
Arc welding equipment should be connected to the input supply system according to the manufacturer's
recommendations. If interference occurs, it may be necessary to take additional precautions such as filtering of the
supply system. Consideration should be given to shielding the supply cable of permanently installed arc 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.
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.
Equipotent 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 an electric
shock by touching these metallic components and the electrode at the same time. The operator should be insulated
from all such bonded metallic components.
Connexion to earth of the work piece
When the work piece 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 work piece to earth may reduce emissions
in some, but not all instances. Care should be taken to prevent the earthling 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 a 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.
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.
1.2 ELECTRICAL SECURITY
1.2.1 Connection to the network
Before connecting your equipment, you must check:
- The safety device against over-currents, and the electrical installation are compatible with the maximum power and the
supply voltage of the welding power source (refer to the instructions plates).
- The connection, either single-phase, or three-phase with earth can be effectuated on a socket compatible with the
welding power source cable plug.
- If the cable is connected to a fixed post, the safety device against electric shocks will never cut the earth.
- The ON/OFF switch located on the welding power source is turned off.
1.2.2 Working area
The use of arc welding implies a strict respect of safety conditions regarding electric currents. It is necessary
to check that no metal piece accessible by the operators and to their assistants can come into direct contact with a
phase conductor and the neutral of the network. In case of uncertainty, this metal part will be connected to the earth with
a conductor of at least equivalent section to the largest phase conductor.
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