Preparatory work before the installation of electrical wiring. Fixing work. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Preparatory work before the installation of electrical wiring. Fixing work. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electric installation work

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Fixing work performed in several ways. When fixing needs to be carried out quickly, alabaster solutions are used. The setting time of the alabaster solution can be adjusted by adding a retarder or setting accelerator to the water during its preparation.

Cement mortars are also used - then the fixing time increases, since the setting of some brands of cement occurs after 12 hours. In damp and especially damp rooms, fastening with cement mortar gives the best results.

A promising method compared to others is gluing network elements to building bases with adhesives made of polymeric materials. This method allows you to abandon the punching work, construction and assembly guns. When installing electrical wiring with wires of the APRV, PRV, APN, PPV, APPV brands, VRG, AVRG, NRG, ANRG cables with a cross section of conductors up to 16 mm2 and ground strips, it is recommended to use BMK-5K adhesive. It includes 180 parts (by weight) of BMK-5 resin, 420 parts of acetone and 400 parts of kaolin.

To attach the fasteners, a special glue KNE-2/60 (kumarno-anirite electrotechnical) is also used. It has good adhesion to metal, concrete, brick, ceramic, wood, plastic (except polyethylene and fluoroplastic) substrates, has high impact strength, cold resistance and resistance to sudden temperature changes (from -20 to 20 °C). Surfaces must be free of whitewash and paint. The glue is applied with a spatula to the surfaces to be glued in such a way that the total adhesive layer is no more than 1 mm. After exposure (1-3 minutes), the surfaces are glued. Widely used in electrical practice fastening with expansion dowels. The most common are plastic and steel dowels with a spacer nut. The industry produces plastic dowels of U656UZ-U678UZ types.

Electrical products used for fastening wires, pipes and cables

For fastening wires, pipes and cables to building bases and structures, staples K142U2-K145U2 and K729U2-K.731U2 are used. They are used for fastening one wire or cable with a diameter of 27-48 mm for K142U2-K145U2 brackets and with a diameter of 12-20 mm for K729U2-K731U2 brackets. Staples can be with two or one paws.

Strips and buckles are used to fasten wires and cables to building bases. The strips are produced in lengths of 120 mm (type K404UHL2) and 180 mm (type K405UHL2). Buckle strips are used to fasten bundles of wires to various structures. Strip buckles are produced with a length of 110 mm (type K395UHL2), 90 mm (type K396UHL2), 70 mm (type K397UHL2), 50 mm (K398UHL2).

Instead, you can use strips of galvanized iron (tin cans) or thin sheet aluminum. To secure wires and cables using such strips, their ends should be folded.

For fastening wires and cables with a cross section of up to 6 mm2, spring clips are used. They are used for open wiring.

For fastening wires to building structures during the installation of open electrical wiring, pipe clamps are used. To fasten the wires of open internal wiring, plastic or porcelain rollers are used.

The wires are tied to the rollers with soft galvanized steel wire with a diameter of 0,6-0,8 mm. In places of attachment to the rollers, the wire is wrapped with insulating tape.

In accordance with the markup, fasteners are installed - fittings for hanging ceiling lights (Fig. 29).

Preparatory work before the installation of electrical wiring. Fixing work
Rice. 29. Mounting fittings for ceiling lights.

Author: Korshevr N.G.

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