Installation of cable wiring. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Installation of cable wiring. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric installation work

Cable wiring are a kind of open and are used to power power and lighting electrical receivers of industrial premises, territories, driveways, warehouses, etc.

The bearing element of these wires is a steel cable with a diameter of 3-6,5 mm or a galvanized wire with a diameter of 5-8 mm. With the help of anchor and tensioning devices, the cable (wire) is pulled along the route. If the length of the wiring is more than 6 m, then support strings made of galvanized wire with a diameter of 1,52 mm are installed. The sag should be no more than 100-150 mm. The wires are connected in junction boxes, and the branches are made in junction boxes suspended on a carrier cable. The cores of the wires are connected by welding, crimping or squeezing.

Cable wiring installation
Rice. 36. Installation of cable electrical wiring: a- AVT wire; b - insulated wires on plastic hangers on a longitudinal cable; c - stranded wires and cables of small sections on plastic clips on a longitudinal cable; g - the same, but fastening with a bandage; e - power and control cables on suspended Christmas tree structures fixed on a cable

Rope wiring is carried out with special ABT wires, protected and unprotected insulated wires and unarmored cables suspended from a tensioned steel cable. A steel cable with a diameter of 3,0-6,5 mm or galvanized steel wire with a diameter of 5-6 mm is used. The diameter of the cable depends on the length and load on it.

Anchor or through bolts are used for the end fastening of steel cables.

Unprotected insulated wires (APV, PV, APR, PR) may be fixed on a cable or wire with a bundle of galvanized steel brackets and strips. The distance between the brackets along the length of the route should be 200-300 mm, the thickness of the brackets and strips should be at least 1,5 mm, and the width should be 15 mm. Staples and strips must have a protective coating against corrosion. At the attachment points, the wires are wrapped with two or three layers of insulating tape or pads of electrical cardboard (roofing material) are placed between the bracket and the wire. The width of the gaskets is chosen so that the gasket protrudes from under the brackets on both sides by 1,5-2 mm.

Insulated wires of the APR, APRV and APV brands, as well as unarmored cables of the AVRG, ANRG, ASRG, AVVG and APVT brands are used for cable wiring.

Rope electrical wiring is also made from special wires with rubber insulation and plastic insulation with a steel carrier cable built into the wire; in this case, cable wiring is grounded.

Insulating hangers are used, the distance between which should be no more than 1,5 m when hanging a wire or cable from a cable.

Wires and cables with plastic insulation in rooms with fireproof ceilings can be fastened directly to the cable with a plastic perforated tape with buttons or a steel strip "in the lock". The distance between the fasteners is no more than 0,5-0,6 m.

The luminaires are attached to the anchor devices of the clicks, the wires from them are connected to the main line using flat clamps in a plastic case. The cable can simultaneously serve as a working ground for lamps.

Cable wiring finds a wide variety of applications in the national economy and individual construction (for example, for supplying energy to a summer kitchen, outbuildings, a garage, a workshop, or for powering individual electrical receivers and electrically driven mechanisms that are used on the site). This type of wiring has a number of advantages. First of all, this is the ease of installation work, installation of fasteners and reliable fastening to the bases.

Rope wiring can be adapted to almost any environmental conditions.

Author: Bannikov E.A.

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