Reccomendations On The Assessment Of The Surrounding Area; Reccomendations On Methods Of Reducing Emissions - Air Liquide FRO PRACTIC 191/2 User Manual

2.1 RECCOMENDATIONS ON THE ASSESSMENT OF
THE SURROUNDING AREA
Before installing welding equipment the user
shall make an assessment of potential electro-
magnetic problems in the surrounding area.
The following shall be taken into account:
a. other supply cables, control cables, signalling
and telephone cables; above, below and adja-
cent to the welding equipment;
b. radio and television transmitters and receiv-
ers;
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 measure-
ment;
g. the immunity of other equipment in the envi-
ronment. The user shall ensure that other
equipment being used in the environment is
compatible. This may require additional pro-
tection measures;
h. the time of day that welding or other activities
are to be carried out.
i. The size of the surrounding area to be consid-
ered will depend on the structure of the build-
ing and other activities that are taking place.
The surrounding area may extend beyond the
boundaries of the premises.
2.2 RECCOMENDATIONS ON METHODS OF REDUC-
ING EMISSIONS.
a. Mains supply.
Welding equipment should be connected to
the mains supply according to the manufac-
turers recommendations. If interference
occurs, it may be necessary to take additional
precautions such as filtering of the mains sup-
ply. It should be taken measures to shielding
the supply cable of permanently installed
welding equipment, in metallic conduit or
equivalent. Shielding should be electrically
continuous throughout its length. The shield-
ing should be connected to the welding power
source so that good electrical contact is main-
tained between the conduit and the welding
power source enclosure.
b. Maintenance of the welding equipment.
The welding equipment should be routinely
RECCOMENDATIONS OF REDUCING EMISSIONS.
maintained according to the manufacturers
recommendations. All access and service
doors and covers should be closed and prop-
erly fastened when the welding equipment is
in operation. The welding equipment should
not be modified in any way except for those
changes and adjustments covered in the man-
ufacturers instructions. In particular, the spark
gaps of arc striking and stabilizing devices
should be adjusted and maintained according
to the manufacturers recommendations.
c. 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.
d. Equipotential 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 a shock by
touching these metallic components and the
electrode at the same time. The operator
should be insulated from all such bonded
metallic components.
e. Earthing of the workpiece
Where the workpiece is not bonded to earth
for electrical safety, not connected to earth
because of its size and position, e.g. ships hull
or building steelwork, a connection bonding
the workpiece to earth may reduce emissions
in some, but not all instances. Care should be
taken to prevent the earthing of the workpiece
increasing the risk of injury to users, or dam-
age to other electrical equipment. Where nec-
essary, 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 bond-
ing should be achieved by suitable capaci-
t a n c e , s e l e c t e d a c c o r d i n g t o n a t i o n a l
regulations.
f. 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.
TO SAVE WITH ATTENTION THESE
INSTRUCTION.
GB
19