How to connect SIP to CIP? Rules and materials

Design and technology of manufacturing self-supportinginsulated wires (SIP) were developed more than half a century ago by engineers of Finnish grid companies with the assistance of power equipment manufacturers as an alternative to bare aluminum wires and cable rope systems. The installation of such lines does not require the performer special skills. Significantly simplified various technological operations: laying on the supports, connecting SIP to SIP, to existing power lines, to consumers.

Types and technical characteristics

To date, the market of electrical materialsdifferent versions of self-supporting wires are presented: from SIP-1 - a four-wire version with a zero-core carrier for 380 V networks - to complex systems including control conductors, and SIP-3, rated for 35 kV. Isolation, as a rule, is made of cross-linked stabilized polyethylene resistant to ultraviolet radiation, current-carrying veins cross-section from 16 to 150 mm² - made of aluminum alloy. SIP of special purpose is produced: sealed (SIPg), not supporting combustion (SIPN) and others.

Materials for CIP connection

Each brand of wires has its own characteristics and,accordingly, the fitting used for installation has some differences. For functional purposes, all materials can be divided into several groups:

Intermediate suspensions, hooks and brackets,anchor clamps, fastening elements intended for fixing wires to supports, structural elements, facades of buildings, distribution and input devices.
Puncture clamps. They are used for creating connections and branch lines, connecting CIPs to wires and consumers.
Earthing kits, safety devices, insulating materials.
Tools and accessories for installation.

For the production of materials used high-quality steel with anti-corrosion coating and polymers that are resistant to weathering and UV radiation.

All by the rules!

Requirements and standards of laying isolatedof overhead lines (VLI) are set forth in the normative document "UWP up to 1kV", compiled on the basis of the Electrical Code of Ukraine (Rules for the installation of electrical installations), taking into account the norms of current SNiPs and GOSTs. In the UW, the minimum permissible distances of wires of the VLI to the surface of the earth, motor roads, navigable highways, walls and roofs of buildings, windows and balconies are prescribed. Clear instructions are given on how to install and secure the power supply line, the rules for connecting SIP, overvoltage protection devices and grounding elements.

Minimum life expectancy of SIP, on assurancesmanufacturers, is 25 years, and the claimed - about 40. The main advantage of such an air line is the minimization of labor costs during installation, operation and maintenance.

Main line

In the course of preparation for the main works, they clearthe territory from large branches of trees, bushes, freeing up space for installation of supports, rolling and stretching of SIP. If possible, the brackets for the wires are mounted on the supports still on the ground. The installation of overhead lines should be carried out at an ambient temperature above -10 ° C. SIP is laid on supports using a system of rollers and tension rope. Next, the winch is gradually stretching and fixing the wires on each span. The tension force is controlled by a dynamometer (the optimal tension values are indicated in the tables for each type and cross section of the SIP, in the accompanying technical documentation). At the same time, the sag value is visually checked. If the length of the trunk exceeds 100 meters and the cross-section of the conductors is 50 mm², the above work is carried out with the involvement of mechanization.

On the extreme supports are left behind the wire release latches to connect the previous and subsequent sections of the power line.

Connections and branches

Traditional and familiar for many electricianstwisting, in self-supporting systems replaced special tapping devices - hermetic piercing clamps. With their help, without the removal of insulation, it is possible to quickly, reliably and, most importantly, safely make SIP connections to the SIP trunk, to exposed aluminum wires or to the outgoing cables. The mechanism providing good contact consists of plates with pyramidal teeth and a clamping screw with a stall head (most often a key for 13 or 17 mm). In modern clamps, electrical contact between the plates and the head is excluded, therefore, the artist can perform work with the appropriate qualification without relieving tension. On the body, reinforced with fiberglass, the sections of the main and branch lines for which the clamp is intended are indicated.

Editing of branches

Branching to consumers can be accomplishedan air line or an underground cable. When electrifying private households, the first method is most often used. For connection, you can use SIP-4 (without a zero-core carrier). The anchor fastening with the clamp for the wire is mounted on the nearest main building. When connecting the SIP to the main line (only after wiring the shield!), The piercing devices described above are used. The second clamp is screwed onto the wall of the building (at a height of not less than 2.75 m) and pulls the wire. If the distance is more than 25 meters, it is necessary to install an additional support with supporting clamps (not more than 10 m from the structure). The height of the wire from the ground surface between the supports must be at least 6 meters. Regarding the rules for further laying the line from the anchorage point to the introduction board at the electricians' forums, unflagging and lively disputes are under way. What is the essence of the problem?

Connecting the CIP to the house

Variants when the electric board is located onthe external wall of the building, almost do not cause controversy - SIP is recommended by running into the corrugated or cable channel, fixed on the facade, put in a shield and connected to the introductory machine. And if the electric board is inside the room? In this case, electricians, according to their convictions, are divided into two irreconcilable camps.

The first argue that SIP can be directly throughhole in the wall with a pre-installed metal or plastic sleeve to bring inside the building and then in a penalty - to the shield. Their opponents argue that the self-supporting wires are intended only for the laying of overhead lines and the insulation of the SIP will be adversely affected by constant contact with the wall surface and mechanical loads and it will not be able to provide adequate electrical and fire safety indoors. Therefore, near the SIP anchorage point, a sealed box with a terminal block or circuit breaker should be installed, and from there, by cable (for example, VVGng), go into the building.

Who is right?

Both options are fairly common and notThey raise objections on the part of controlling organizations when accepting a building. Many manufacturers of cable products have developed their own specifications and mastered the production of CIP-5ng wire, according to their assurances, adapted for indoor installation. But if you really follow the letter of regulatory documents (PUE and GOST R 52373-205), then the second option with the installation of a connecting hermetically sealed box looks more preferable.

Now it remains only to connect the SIPto the SIP on the lead-in support with the help of a sealed piercing clamp. It remains to note that these devices are recommended to be used only once, although some modifications have dismounting bolts.

Maintenance and repair

Declared by the manufacturers of the service lifeself-supporting wires and clamping devices, which connect SIP to SIP, is up to 40 years. In maintenance, as such, such systems do not need. It is enough to conduct a periodic visual inspection. If the integrity of the insulation coating or the cores themselves is detected, it will be necessary to perform repair work.

A vein with damaged insulation is separated from the common oneharness with the help of special wedges or improvised devices made of dielectric material and apply a double layer of insulating tape to the defective area.

In the event of damage to the conductor (lengthup to 2 m) this area is replaced by a new wire, similar in cross-section and brand. Connections are made with leakproof piercing clamps. With a longer length, it is more advisable to replace completely the entire vein (or tourniquet).

Competent installation and timely repair - a guarantee of uninterrupted power supply of the site.