When laying cable lines, connections and endings are also necessary. Not only muffs and heads are used to create them, but also cable press. The selection of the right connection technique depends on factors such as voltage or type of insulation.

Types of connections used in cable lines

A special challenge when laying cables is to connect them, because on the final section you also need to remain tightness and insulation. That is why solutions such as battery press, head or muff are used. On the route of the cable line, primarily through passing muffs are used. They work especially on long sections of the line, because it happens that the content of one cable drum is too short to run the entire section of the route. Muffs are placed not only at the stage of laying the line, because after commissioning of the line for use, they are used to repair damage. In the case of low voltage line, branching muffs are sometimes used, but they are unlikely to be recommended, because in the event of a failure, each branch makes it difficult to find a place of damage. It is also worth remembering that using a large number of muff is definitely not a good solution. Each of them is a weak point of the cable line, because it is around the heads and the muff that damage is most often caused. The temporary muff is particularly avoided, which would connect old cables with paper-oil insulation and new plastic insulation cables.

The presence of heads is mandatory, because each line must have its beginning and end, and it is used on them. The assembly of heads and muff is one of the most difficult and most important stages of laying cable lines. It requires a fitter of knowledge, experience and perseverance, because any break at work can result in insulation moisture.

Material of workmanship and connecting cable veins

The capabilities of the equipment used to lay cable lines are largely dependent on the material. Similarly, in the case of overhead lines - the cable lifting made of aluminum is intended for less load than stainless steel equipment.

Cable veins can also be made of various materials. Aluminum veins are used, which can be combined by welding or pressing. Fast oxidation belongs to the biggest minuses of aluminum. The oldest method of connecting is gas welding, but electric welding gives much better results. When welding, protective discs are used because otherwise it could be overheated. After combining, insulation and cooling jaws are assumed, you also need to watch so that there is no liquid aluminum leakage. It is worth remembering that due to your troubles and cooling, welding is used less and less, and many manufacturers even prohibit connecting their cables in this way.

Pressing is definitely more commonly used. It is enough to place the vein in the jaws of the press and tighten, thanks to which the combined materials are prepared. Prages for cables are used here, which may have a manual or hydraulic drive. It is important that the jaws are made of durable material, because the pressure force must be very high.

Copper cables are easier to connect than aluminum ones. You do not have to be afraid of rapid oxidation or leakage of liquid material. The connection can be easily pressed with one dent.

Prague for cables and mounting muff and heads

In addition to the connection of the veins, it is necessary to install a muff and heads. In the past, cast iron muffs were often used, which connected paper-oil insulation cables. Currently, muffs made of polyurethane are used, designed for low voltage cables. They allow you to connect three or four cables, so they can be used not only as through, but also branching muffs.

The installation of a muff made of chemosonal resin is relatively simple. When the veins, coatings and armor are connected, they should be cleaned and degreased, and then you can put on a plastic form that allows you to properly form the resin.

Muffes made of heat shrink pipes are also used. When the ends of the cable are already prepared, you can slide the internal and outer heat shrink pipe, after which the veins are connected. As the name suggests, the pipes are thermocurcinous, so to finish the connection it is necessary to heat them with a burner. The adhesive gets shrinks, thanks to which it seals the adjacent surfaces.

It is also necessary to install heads that perform several basic functions:

• ensure insulation of veins at the end of the cable,
• create a tight end of the cable,
• They add the cable (complement the filling of the satin in the case of paper-oil insulation cables),
• They stiffly attach the divergent veins (short -circuit resistance).

The type of head is dependent on the type of cable. In the past, cast iron heads were most often used. With cables with Polwinit insulation, a head -free cable end is possible. If we use polyethylene insulation cables, it is necessary to use a sealed belt head, even if the cable is located in the room.

Connections and endings are sensitive places that need to be carefully secured - there is a high risk of damage here. So it is so important to use appropriate techniques and equipment.