HEALTH & SAFETY
a crane hook, they must be carefully shielded—for example, using dry textile ropes or an insulated swivel hook. In cases where suspended work baskets are used while welding, these must be fitted with suitable insulation. Only insulated equipment may be used when welding and working with power tools at the same time.
Working in conditions with high electrical voltage There is an increased risk of electrical
hazards in workplaces with restricted freedom of movement. This applies in particular when welding specialists have to work in forced postures—such as kneeling—and come into contact with electrically conductive parts. Areas that are completely or partially surrounded by electrically conductive materials also present hazards. Even contact that is unavoidable or accidental can lead to electric shocks. You can use the following rule of thumb
to assess whether there is an increased risk during arc welding: If the free space between electrically conductive parts positioned opposite one another is less than two meters—in length, width, height, or diameter—you should assume that there is an increased electrical risk. Make sure to take particular care in wet,
damp, or hot workplaces, as the resistance of human skin, protective clothing, and protective equipment may be significantly reduced by moisture or perspiration in these environments. Workplaces should be considered ‘wet’ if workwear is soaked with moisture and can therefore conduct electricity—which significantly increases the risk of an electrical accident.
Protective measures Only approved welding machines
marked with the [S] symbol may be used for work involving an increased electrical hazard. Special protective measures are also required to ensure welding specialists are protected from electrically conductive parts as well as damp floors and walls by means of insulating underlays or intermediate layers of material. If this shielding cannot be provided
due to additional hazards—such as a risk of falling—or a lack of space, work may only be carried out while wearing dry, undamaged workwear. In situations where you cannot guarantee that clothing will remain dry, such as in hot environments, only direct current machines may be used for manual arc welding. The open circuit voltage of the devices
used should be kept as low as possible— depending on the welding tasks and
device properties—and must not exceed 75 V. Welding machines must not be set up in the immediate danger zone. Protective extra-low voltage must be used for remote control of these devices. Also ensure that welders do not
work alone on these jobs—suitable supervision must be provided during welding. Only qualified specialists may carry out welding work involving an increased electrical hazard.
Safety first Safety comes first when welding.
Improper handling of welding machines can have serious consequences— especially due to high open circuit voltages, stray welding current, or when working in conditions involving increased electrical hazards. However, these risks can be significantly reduced by consistently observing suitable protective measures. Special attention is required in wet,
damp, or hot workplaces, where the protection provided by clothing and equipment may be impaired. If faults occur, appropriate steps must be taken immediately to prevent personal injury and damage to property.
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