At every stage of laying cable lines, health and safety rules apply, which prevent not only preventing cable damage, but also the threat to the health and life of employees. For safety reasons, the cables are transported on drums, and when laying them, equipment such as a cable roller is necessary. However, how to deal with drums to keep safety and not damage the wires? In this article, we will look at the storage, transport and development of cable drums.
Safe transport of cable drums
Power cables, used for laying lines, are transported on drums, the weight of which can reach up to 8 tons. Due to the shape of the drums, it is therefore necessary to protect them against spontaneous rolling during transport. The wedges work here, it is also recommended to transport drums with axes arranged horizontally.
Drums with a diameter of up to 1.2 meters can be reversed with turts, and then horizontally transported on pallets. Larger drums must be placed on stands adapted to their size. It is best if the rack height is 5% of the drum diameter + 2 centimeters inventory.
Due to the significant weight, forklifts are primarily used to lift cables, although you can also use, for example, hydraulic car cranes. It is worth remembering that both side discs should be based on forks.
Drum dropping is definitely not allowed, but it is permissible to roll them over a short distance. This can only be undertaken on a hard, flat ground and according to the direction marked on the drum. Turning according to the winding direction avoids loosening the cable.
Briefly - and long -lasting cable storage
Cable protection is crucial from damage, so when laying, glass fiber for cables is used, but you also need to ensure proper storage of cable drums. The basis is sealing cable endings - the thermocurcinous hoods are used here, protecting against moisture. The ends of the cables should be permanently attached to the drum, e.g. with special bands.
It is best to store drums with axes located horizontally. Particular care must be taken at low temperatures, because even minor stress or impact can lead to damage. You also always need to check the technical condition of the drum structure, and if there are possible looseness, for example, through solar radiation, be sure to tighten the mounting screws. It is also risky, for example, sticking nails or a buckle in the drum shield, so you need to be especially careful not to damage the cables. The recommended behavior with cables also depends on their color - the cables are usually black, but there are also non -standard cables. If they do not have a shell that protects against UV radiation, they should be covered with black polyethylene foil or even a buffer zone designed for this purpose.
Long -term storage is particularly problematic, so if possible, it is better to avoid it. Storage should not last longer than 12 months. At least every 3 months you must also make a thorough inspection of the technical condition of drums and cables. It is also necessary to take care of proper storage conditions for cable drums: they should be on a flat, hard surface (preferably concrete, hard gravel or wooden beams). The drum should not lie, but stand on the side discs. Poor storage can damage the drum structure and even the destruction of the cable, which will not be suitable for assembly. If there is hot weather, it is worth considering that the wood is shrinking, so it may be necessary to tighten the mounting screws. Cables must also be protected against moisture - in the event of any damage, it is necessary to replace the heat shrink caps.
Drum cable unwinding
When developing drums, devices such as a cable lift, developer or invasion are useful. When unwinding, the temperature should not be lower than -5 degrees. If work in such conditions is necessary, cable drums should be stored for at least 24 hours in a room with a temperature above 10 degrees. It is best to not only remove the tape or protecting clamp before unwinding, but also tighten the mounting screws. The diameter of the axis of the unwinding device should be at least 5 mm smaller than the diameter of the drum axis hole. You also need to watch the technical condition of the drum, because it happens that during transport or storage nails slide out and can damage the cables. The developer must also be equipped with mechanisms to prevent automatic unwinding the cable - the cable should only develop if it is pulled. It is also necessary to adapt the unwinding force to the material of the cable: for copper cables should be 5 dan/mm² of cross -section, and for aluminum - 3 dan/mm².
Proper transport and storage are not only a matter of safety, but also savings, because errors can lead to cable damage and preventing them from using the line.
