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Safety specifications for MIG/MAG welding machines
Depending on the process used, it may happen that there is an addition of
the two open circuit voltages between the welding electrodes of two power
sources. There is possibly the risk of danger to life if both potentials are
touched at the same time, see Figure 3.
Electric shocks can be caused when touching the point of the torch (wire)
when the open circuit voltage is more than 48 V and simultaneous skin
contact with metal parts at the mass potential of the welding machine.
Protective measures by a suitable insulation are absolutely necessary. The
open circuit voltage is indicated on the type plate of the welding machine.
3.4.3. Protective conductor
Danger of severe personal injury because of improper mains connection
In the case of improper mains connection of the machine severe shock
currents may arise.
In connection with the welding power source the protective conductor may
be destroyed by faulty mass connections with earthed welding systems.
• Make sure that the protective conductor connection is correct and tight!
(VDE rules).
• The functioning of the protective conductors, the supply network and
machine cables must be checked before commissioning and in regular
intervals by a skilled electrician.
It is regarded as gross negligent to operate a power source on a supply
network without protective conductor. The manufacturer is not liable for
damages occurred hereof.
Before working on the power source, switch off the machine and disconnect
the mains plug. Please use a warning sign as protection against unintended
restart.
A second person should be present for safety reasons if working on voltage-
carrying parts is required.
Figure 3. Added open circuit voltages
WARNING!
DANGER!
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