UNIFIRE
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Screening of mains cable of the plasma installation (safe contact between screen and
housing required)
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Constant maintenance
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Always keep cover plates and doors of the plasma machines closed
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Avoid excessive length of cutting cables
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Arrange potential equalisation between metallic parts around the installation (the
operator has to be insulated from those parts)
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Earthing of the work piece
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Selective screening of other cables and installations
Endangerment through heat and light radiation
The plasma arc produces intense ultraviolet and infrared radiation that can hurt the eyes and
skin. Therefore the following precautions have to be arranged:
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Wearing of flame-retardant welding clothes (helmet, apron, gloves, safety shoes)
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Hand or head shield with protective glasses of medium shade for watching the cutting
process
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Preparing the cutting area so that reflection and transmission of ultraviolet light is
reduced:
-painting of walls in dark colour
-use of protective walls and screens
Endangerment through fumes and smoke
Due to the plasma process itself hazardous substances may be produced. To avoid risks on
health the following has to be done:
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Keep cutting place well ventilated
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Remove fumes and smoke by exhaustion devices
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Remove all chlorinated and other solvents from the cutting area. They could form
phosgene gas when exposed to ultraviolet radiation
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Wear a breathing mask when cutting galvanised materials
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Ensure that toxic limits are not exceeded
Endangerment through noise
Be aware that during plasma cutting a high noise level arises.
Cutting current
Thickness
Noise level in distance of
0,5 m
1,0 m
No load
56dB(A)
80A
4mm
82 dB(A)
79 dB(A)
160A
l6mm
86 dB(A)
83 dB(A)
240A
l6mm
96 dB(A)
92 dB(A)
Above levels are general. Variations may occur.
Therefore wear proper ear protection.
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