Quite often, especially in recent years, can be seen during the construction or repair of use flutes, which are placed in the electrical wires.
Experience shows that during the laying of electrical wiring in the corrugations is made sufficiently large number of errors, related to the fact that the material from which made the corrugation, attributed the qualities that he did not inherent.
Many believe that the corrugation can:
- to protect the wiring from the spread of fire;
- protect against a variety of mechanical nature and impact damage from excessive load.
These statements impel people the advice they supposedly revered in Rules for the operation of electrical (PUE). There really is a description of certain fire-fighting properties of this material, but many understand what is said is wrong.
Fire properties corrugated pipe
Many electricians are of the opinion that the corrugated hose can protect the wiring from the fires, because they have the fire properties. Therefore, they use them when installing wiring in residential areas or offices. However, these professionals know that the real protection from fires can give only metal tubes or trays.
It is important to understand that the corrugated pipe, according to the manufacturers and technical documentation to be able to just "do not support" fire.
The EMP contains all uses of corrugated pipes (Table 2.1.3). There you have and guidance on the rules and methods of laying cables with maximum safety. Particularly noteworthy are the words that modern wire with copper core in the shell (such as, for example, VVGng15) Already have fire protection.
There is also the question of the use of a corrugated pipe as nonflammable gasket used when installing wiring in wooden buildings. However, as already mentioned, the corrugation is not a non-combustible material and if it is used on wooden bases, the other reasons that are not related to fire safety.
Protection against mechanical impact and the possibility of replacing
corrugation is used often as a protection against mechanical impacts occurring, for example, from the action of rodents. But, as this material is destroyed quite easily fall on him, more or less severe object and easily gnaw through pests, the use of corrugated tubes in this respect, it does not sense.
It is wrong that, if necessary, replace the wires in the corrugation, it can be done quickly and easily. In fact, this is true only half, because it is true only for flat surfaces on a straight section. Once on the road twists and turns appear, replacing the wiring in the ripple becomes extremely complex (pictured above). In this case it is much easier to dismantle the harness and place it on a straight section where prodernut wire in the corrugation.
Given this information, we can conclude that,
- that only, which meant that protection, it is for the installation of electrical wiring. In fact, the corrugation allows for concealed wiring, that is to receive the assembly of all lived in one place.
- Protect against fire and serve fireproof lining the corrugated tube can not.
- Flush on flammable surfaces it is necessary to use pipes made of steel.
If you can not use a steel pipe, then, as a last resort, you can use the layer of non-combustible materials such as plasterboard.