Laying wires on rollers. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Laying wires on rollers. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric installation work

First, consider the laying of twisted two-core wires of the PRD, PRHD brands (Fig. 39).

Twisted two-core wires of these brands are used for wiring lighting networks only in dry, heated rooms with a normal environment. In this case, rollers of the type RP-2,5, RP-6, RSh-4, etc. are used.

The marking of routes and wiring elements is carried out in accordance with the requirements for open wiring.

Cable routing on rollers
Rice. 39. Sequence of operations when attaching wires PRD, PRD to rollers

The rollers are installed at a distance of 800 mm from each other, from the ceiling and from the adjacent wall - at a distance equal to twice the height of the roller, the height from the floor is at least 2 m.

On wooden bases, the rollers are fixed with round-head screws - they do not split the roller when fastened. Screws are screwed into a hole, previously pricked with an awl or drilled with a drill bit of a smaller diameter than the screw.

It is allowed to fasten the rollers with nails, but at the same time, elastic washers must be placed under the head of the nails.

On brick and concrete bases, the rollers are also fixed with screws. The holes are punched with a jumper, the screws are screwed into nylon or polyethylene dowels, pieces of insulating tubes, wooden plugs, a wire spiral.

After installing the rollers, the wires are laid and fixed: at one end the wire is tied to the final roller, then they are pulled and the places of the branches performed on the rollers are marked. Having made a branch, the wire is pulled again and tied to another end roller.

For uniform tension, the wires are first put on the middle intermediate rollers, then on the subsequent ones. The wire is tied to the rollers with cotton braid, cord or thin twine at certain points of the line: on branches, end and corner rollers, on transitions from the ceiling to the wall and from one wall to another, on the ledges of the surface and at the aisles. The wire is only put on the intermediate rollers, but not tied. The nodes are placed under the wire.

If necessary, the third and fourth wires can be woven into the two main wires. Such three- and four-core wires are laid on rollers in the same way.

Single-core insulated wires of the APV, PV, APRV, PR brands are laid on rollers in dry and damp, heated and unheated rooms, under sheds and in external wiring in the same sequence as the two-core wires of the PRD, PRHD brands. In dry and damp rooms, wires are laid on rollers of the RSh-4, RP-2,5, RP-6 type, etc., in damp rooms and outdoor electrical wiring - on rollers of the PC-10 and RS-25 type.

Only one wire is attached to each roller. The wires are tied to the rollers with a "cross", and on the corner and end rollers, where more precise fastening is required, - with a "cross with a clamp". For knitting, soft galvanized steel wire is used, since it is not afraid of corrosion. The diameter of steel wire for tying wires with a cross section of 2,5 mm must be at least 0,6 mm. The wires to the rollers can be fastened with copper strands of the remaining wire scraps. In places of knitting, 2-3 layers of insulating tape are applied to the wire.

The connection of conductors branched off from the main line is carried out by crimping, welding or soldering, then tied to the roller so that it does not experience tension in the form of tension.

Wiring with single-core insulated wires of the APR, PR, PV, APRV brands on insulators is most often performed in damp and especially damp rooms and outdoor installations. Insulators are mounted on walls on steel pins, hooks and supports, on the ceiling, anchors and semi-anchors.

The branching of the wires is carried out only on insulators, to which the wires are attached with galvanized wire. To insulate the wires, it is necessary to wind up from 2-3 layers of insulating tape.

Wires, with the exception of corner and end wires, are attached to pin insulators using rings or a PVC cord.

On intermediate pin insulators, the wires are laid on the necks or heads, on the corner ones - only on the necks and on the outside of the corner. On the end insulators, it is allowed to install plugs, wires with aluminum and copper conductors (with a cross section of at least 4 mm2 and at least 1,5 mm2, respectively).

When laying single-core insulated wires, the following minimum allowable distances between attachment points must be maintained: for wires with a cross section of up to 10 mm indoors and outdoors - more than 2 m; between the mounting axes - at least 70 mm; from the wire to the floor level in rooms without increased danger - at least 2 m, in all other cases - at least 2,5 m.

Author: Bannikov E.A.

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