vi | SAFETY | vi |
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| Electromagnetic Compatibility (EMC) |
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| The size of the surrounding area to be considered will depend on the structure of the building and other |
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| activities that are taking place. The surrounding area may extend beyond the boundaries of the premises. |
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| Methods of Reducing Emissions |
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| Mains Supply |
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| Welding equipment should be connected to the mains supply according to the manufacturerʼs recommenda- |
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| tions. If interference occurs, it may be necessary to take additional precautions such as filtering of the mains |
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| supply. Consideration should be given to shielding the supply cable of permanently installed welding equip- |
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| ment, in metallic conduit or equivalent. Shielding should be electrically continuous throughout its length. The |
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| shielding should be connected to the welding power source so that good electrical contact is maintained |
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| between the conduit and the welding power source enclosure. |
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| Maintenance of the Welding Equipment |
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| The welding equipment should be routinely maintained according to the manufacturerʼs recommendations. |
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| All access and service doors and covers should be closed and properly fastened when the welding equip- |
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| ment is in operation. The welding equipment should not be modified in any way except for those changes |
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| and adjustments covered in the manufacturers instructions. In particular, the spark gaps of arc striking and |
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| stabilizing devices should be adjusted and maintained according to the manufacturerʼs recommendations. |
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| Welding Cables |
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| The welding cables should be kept as short as possible and should be positioned close together, running at |
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| or close to floor level. |
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| Equipotential Bonding |
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| Bonding of all metallic components in the welding installation and adjacent to it should be considered. |
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| However, metallic components bonded to the work piece will increase the risk that the operator could |
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| receive a shock by touching these metallic components and the electrode at the same time. The operator |
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| should be insulated from all such bonded metallic components. |
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| Earthing of the Workpiece |
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| Where the workpiece is not bonded to earth for electrical safety, not connected to earth because of its size |
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| and position, e.g., ships hull or building steelwork, a connection bonding the workpiece to earth may reduce |
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| emissions in some, but not all instances. Care should be taken to prevent the earthing of the workpiece |
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| increasing the risk of injury to users, or damage to other electrical equipment. Where necessary, the connec- |
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| tion of the workpiece to earth should be made by a direct connection to the workpiece, but in some countries |
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| where direct connection is not permitted, the bonding should be achieved by suitable capacitance, selected |
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| according to national regulations. |
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| Screening and Shielding |
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| Selective screening and shielding of other cables and equipment in the surrounding area may alleviate prob- |
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| lems of interference. Screening of the entire welding installation may be considered for special applications. |
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1 |
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1 | Portions of the preceding text are contained in EN |
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| uct standard for arc welding equipment.” |
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L10093