12
Hazards from
mains and
welding current
- An electric shock is potentially life-threatening, and can be fatal.
- Do not touch any live parts, either inside or outside the machine.
- In TIG welding, the welding wire, the wire spool, the drive rollers and all metal parts
having contact with the welding wire are also live.
- Always place the wirefeeder on an adequately insulated oor or base, or else use a
suitable insulating wirefeeder holder.
- Ensure sufcient protection for yourself and for other people by means of a dry base
or cover that provides adequate insulation against the ground/frame potential. The
base or cover must completely cover the entire area between your body and the
ground/frame potential.
- All cables and other leads must be rmly attached, undamaged, properly insulated
and adequately dimensioned. Immediately replace any loose connections, scorched,
damaged or underdimensioned cables or other leads.
- Do not loop any cables or other leads around your body or any part of your body.
- Never immerse the welding electrode (rod electrode, tungsten electrode,
welding wire, ...) in liquid in order to cool it.
- Never touch it when the power source is ON.
- Twice the open-circuit voltage of one single welding machine may occur between the
welding electrodes of two welding machines. Touching the potentials of both
electrodes simultaneously may be fatal.
- Have the mains and the machine supply leads checked regularly by a qualied elec-
trician to ensure that the PE (protective earth) conductor is functioning correctly.
- Only run the machine on a mains network with a PE conductor, and plugged into a
power outlet socket with a protective-conductor contact.
- If the machine is run on a mains network without a PE conductor and plugged into a
power outlet socket without a protective-conductor contact, this counts as gross negli-
gence and the manufacturer shall not be liable for any resulting damage.
- Wherever necessary, use suitable measures to ensure that the workpiece is suf-
ciently grounded (earthed).
- Switch off any appliances that are not in use.
- Wear a safety harness if working at height.
- Before doing any work on the machine, switch it off and unplug it from the mains.
- Put up a clearly legible and easy-to-understand warning sign to stop anybody inad-
vertently plugging the machine back into the mains and switching it back on again
- After opening up the machine:
- discharge any components that may be storing an electrical charge
- ensure that all machine components are electrically dead.
- If work needs to be performed on any live parts, there must be a second person on
hand to immediately switch off the machine at the main switch in an emergency.
EMC device
classications
EMC device classication as per the rating plate or technical specications
Devices with emission class A:
- are only designed for use in an industrial setting
- can cause conducted and emitted interference in other areas.
Devices with emission class B:
- satisfy the emissions criteria for residential and industrial areas.
This also applies to residential areas in which power is supplied from the public
low-voltage grid.
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