Conduit
An empty pipe is a rigid or flexible pipe made of plastic or metal for the installation of electrical lines or pipes . Empty conduits are also known as corrugated conduits , installation conduits , and in other disciplines as corrugated hoses . Common outside diameters are 16, 20, 25 and 32 mm.
In electrical installation , conduits are used for the orderly laying and fastening of cables , as cable protection tubes and for preparing a later replacement or retrofitting of wired supply lines. In heating and sanitary installations , empty conduits are used to protect pipelines from corrosion and from mechanical damage to plastic pipes .
use
In buildings
Empty conduits are used to route current-carrying lines in concrete or in cavity walls.
It is common to lay wire and control lines, antenna, network and telephone cables in conduits in order to protect them and to be able to replace them later. The line systems of communication technology are usually renewed and adapted more often than the rest of the installation due to changing requirements.
In the course of the electrical installation, empty conduits are mostly routed into slots in the masonry ("flush-mounted" or "UP"). The wall plaster is seldom applied in sufficient thickness to be able to lay the conduits on the shell wall ("in the plaster").
The DIN 18015-3 provides for the laying of electrical installations within specific installation zones before that, parallel to the floor ceiling, room corners and wall openings.
The subsequent pulling in of lines is made easier by using pulling wires (in Austria “spring”), lubricant, compressed air or negative pressure generated with the help of a vacuum cleaner or vacuum pump .
Outside
Empty conduits are often laid underground when the earth has been dug up anyway due to civil engineering work to lay supply lines. Cable ducts offer protection against moisture and mechanical stress.
materials
- Plastic conduits are mostly extruded from polyvinyl chloride (PVC) .
- If increased fire protection is required, metal conduits are used.
literature
- Hans-Günter Boy, Uwe Dunkhase: Electrical installation technology The master's examination . 12th edition, Vogel Buchverlag, Oldenburg and Würzburg, 2007, ISBN 978-3-8343-3079-6
- Winfrid Hauke, Rolf Thaele, Günter Reck: RWE Energie Bau-Handbuch. 12th edition, Energie-Verlag GmbH, Heidelberg, 1998, ISBN 3-87200-700-9