Auxiliary fittings for the installation of a self-supporting insulated wire can be of different purposes, namely:
- for connecting conductors;
- for hanging the wire on a support or anchorage;
- for tensioning the overhead line of self-supporting insulated wire;
- for connecting contact connections and branches;
- protective auxiliary connections;
- fittings for engagement;
- spiral fittings.
Let's consider them in order. The first thing I would like to tell you about is the rollers for rolling out the wire.
When pulling an electric line, care must be taken not to spoil the insulating layer, avoid dragging along the ground, along tree branches and other surfaces. To do this, they resort to dragging on rollers, which are temporarily fixed on poles, in the places of the future location of the wire.
To securely fasten the auxiliary equipment to the support, use galvanized metal tape.
To grip the support tightly, the tensioner pulls the pre-cut piece of tape around the post, squeezes the bracket, firmly fixing it, and cuts off the excess tape.
Fastening hooks are used to perform quick installation of various self-supporting insulated wire reinforcement on supports, pillars and building facades. They differ in the type of attachment.
For smooth cutting of a metal strip, high-quality scissors are useful, leaving no distortions, sharp edges and edges. They allow you to cut with one hand quickly and efficiently, which is certainly appreciated when working at height in confined spaces.
You can compensate for twisting and prevent the appearance of loops on the SIP wire, as well as prevent twisting, using a device such as a swivel, which is used during installation.
In order to roll the wire along the rollers, it is necessary to stretch the cable along them in advance and connect it to the cable, avoiding damage and knots. This can be done using special tightening stockings. The weaving of the stocking is made in such a way that when it is pulled, a large contact area is created and the insulation of the conductor is not damaged.
A winch is used to tension the wires and eliminate the sag of the overhead line. The use of this device in conjunction with a dynamometer allows you to correctly install a tensioned overhead line wire.
To suspend and fix the stretched conductor, special mounting clamps are used. When using a self-supporting insulated wire with an insulated carrier neutral, a thunder-frog clamp is used.
It is made of material that is resistant to environmental influences. Also, when installing the self-supporting insulated wire, we will need anchor and supporting reinforcement, depending on the place of use (support or facade of the building) and other sections of the overhead line and branches from it.
Before installing taps on the wire, it is necessary to separate the prepared core from the self-supporting insulated wire harness. For this there is a phase separator - a wedge of a special shape, which leads the conductor to the required distance, facilitating the installation of branch clamps.
To connect to a self-supporting insulated wire, two types of clamp adapters are used. Branching and piercing clamps. The first are used for equal trunk branches. Compression consists of three plates, between which live conductors stripped of insulation are clamped. It is also called "nut". How to use nut for connecting wires, we talked about in a separate article.
To connect a branch from the trunk, use piercing clamps. When choosing clamps, you need to know the cross-section of the line and the branch, based on this, make a choice.
For crimping the terminals, the ends of the self-supporting insulated wire, connected to the lead-in or accounting board, you may need a press for crimping the terminals and special matrices. With this device, the contact of the core with the tip is obtained with the highest quality.
In addition to all the above listed fittings, it is necessary to have a special protective lubricant (NILED), which prevents an increase in contact resistance, and also prevents the appearance of an oxide film on aluminum wire. Its use increases the service life. Tape (NILED) is used to restore insulation on self-supporting insulated wire and level the surface under heat shrinkage. This tape, based on a special bridge, is highly resistant to ultraviolet and ozone.
An example of installation with a description of fittings for fastening self-supporting insulated wire can be viewed in the picture:
We also recommend watching a video lesson, which clearly shows what tools and devices are used to install the self-supporting insulated wire:
This concludes the review of all tools and devices. Now you know what kind of fittings are for installing SIP cables from the pole to the house.
It will be helpful to read:
- How to conduct electricity to the site
- What tools should a home electrician have
- How to connect a self-supporting insulated wire to a house
