Corrugated wire and cable: Secrets of the correct choice

These products provide additional protection of cables from adverse external influences. Their use simplifies installation. In some situations, they are required to use subject to the applicable regulations (PUE). Modern corrugated wire discussed in this article.

appointment of corrugations

To avoid errors, it is necessary to clarify the requirements of the SAE. Section number 7, noted the possibility of wiring in structures of concrete, brickAnd other non-combustible materials with the rigid fixation. This means that permitted the creation of channels (Stroebe), which later will be closed cement-sand mortar. But when you create walls, overlap and partitions in the factory, so the installation is not allowed. It is necessary to create a hole, which involves replacing the cable if necessary.

The casing holding the solution can be made from suitable lengths pipe. But the use of such products restricts and complicates the gasket complex shape and composition runs.

When installing outdoors corrugation prevents ingress of the outer sheath of the cable in direct sunlight. Please be aware that certain polymers are destroyed UV. The use of such products simplifies installation, improves safety.

Different types of products

Corrugation wire consists of two main parts. Outer coil broader and stronger. It resists corrosion. The gaps between the rings - the narrow and thin. They provide the necessary flexibility without damaging the structure. To simplify the analysis, all the products are divided into two main groups.

Polymer corrugated wire

The following list contains features of different materials:

• Polyethylene is created using high-pressure technology. It is used to set the wiring inside brick wallsAnd other non-combustible construction. Such products are highly resistant to mechanical damage.
• Where required good formability, using polyethylene manufactured by low pressure method.
• The polyvinyl chloride is added flame retardants. With these components of the polymer becomes more resistant to high temperatures and ceases to support the combustion process.
• Polyamide corrugated wire set for better protection against high humidity.

metal corrugated tubes for electric wiring

Such products are expensive. But that they are used at high dust content of the atmosphere, if not excluded the contact with aggressive compounds. The metal shell protects against damage rodents. It will provide increased strength and incombustibility. This material does not absorb pollution and odors, it does not emit substances when heated. It is used to further shield the electromagnetic interference.

This investment is justified in view of a long service life. But inside metal pipes formed under certain conditions of temperature condensate. In drawing up the route plan should provide for the possibility of moisture collecting in the bottom point and subsequent removal.

select the Features

This table shows the parameters of flutes made from different materials:

Useful advice! It should acquire the tube with sufficient inner opening width.

These recommendations will help to choose suitable products:

• Modern corrugated pipe for a cable produced with the expectation allowable load of 125 to 4 thousand. Newtons per cm. sq.
• It takes into account not only static, but also impact. The serial products maximum threshold set at 6.7 kg per 100 mm. sq.
• Limit temperature value - from -50 ° C to + 420 ° C.
• Be sure to check the flexibility of the corrugations, which is indicated in the accompanying documentation.

modification depicted above is characterized by improved performance characteristics. This is - a clear demonstration of advanced products features:

• Such a tube retains integrity at low temperatures. It bent without damage at -40 ° C.
• At + 105 ° C is permissible continuous operation. Briefly allowed to rise in temperature up to + 105 ° C.
• Laboratory tests confirmed the possibility of repeated bending, without the formation of defects (up to 200 thousand. cycles).
• A tip inserted to the latch actuation without a strong pressing. To extract - push actuator of the locking device. Fixing is carried out at six points on the perimeter.
• Variable inner diameter of the docking station and a special O-ring together provide a seal under the international standard IP
• 12/6 faces (ring and spanner respectively) are used to tighten the threaded joint.
• On the side faces plotted data on the internal diameter of the node, the thread parameters.

market offers

This table will help you compare specifications and prices of products from different manufacturers.

Execution of work operations

The following action plan will help to implement the project at a reasonable cost, without errors.

Illustration	Actions
	Determine the number and composition of the component parts. It involves the installation of a network cable fixtures 220 V in an underroof structure. Selected light corrugated plastic pipe wiringDiameter 16 mm. Fastening clip according to acquire this size. Their number is calculated taking into account the distance between them during installation of 25 to 35 cm.
	To save on consumables used straight line track and the shortest distance. Under decorative covering wiring is not visible, so the excellent appearance is not necessary. The layout is applied in advance.
	Given the dimensions obtained create the necessary portions of the corrugated tube. Soft shell cut office knife. Only then share cutters inserted inside the wire. This operation is performed accurately, the probe has not appeared within the corrugations. It is difficult to extract, since a sharp tip stiff wire can get stuck in the shell and damage it.
	By marking up the clip set. According to one product - for each end of the tube. Then - with the selected step. As a rule, plastic anchors and screws They include standard delivery. For drilling holes need appropriate tools.
	It is more convenient to work with the cable in a common dense insulation. It pierced a hole where a probe is inserted. The wire is bent so that it does not create obstacles in the course of moving inside the pipe. If you are using multiple wires, they are collected into a bundle, pull together with electrical tape.
	The cable is pulled so that on completion of the procedure of each end of the corrugations were wires. Their length (8-10 cm) are doing enough to connect fixtures, The junction box. In order to persuade the subsequent assembly operations, and purified by braiding insulation layers removed (approximately 1 cm on each conductor).
	Without the use of excessive force tube is inserted in series in the clip.
	To create a reliable fastening use standard plastic tie wraps.

The need for a corrugated metal cable and the cost of the project

From the table above it is clear that the cost of these supplies is much higher as compared to the polymeric counterparts. But the metal structure has its own carrying capacity. It can withstand without damage the various strengths and mechanical effects. In particular, such membranes are resistant to multiple folds, abrasion. They are used for joining parts that move during use. They are placed where it is necessary to prevent accidental damage to the increased warranty:

• Corrugated metal used for wiring in wooden structures.

• It is set in parallel several powerful method for laying power cables, and also at the intersection of the contact and gas pipes, sections of high temperature.
• If increased content of dust particles requires reliable sealing, the metal shell is also better to the plastic.
• She can take the load when installed in the depth of the concrete screed, When laying tracks in the ground.
• This product retains its shape, so it is used where it is necessary to provide the possibility of replacing cables in the future.

To evaluate the project using a long time interval. Taking into account the lifetime of over 50 years and other improved consumer characteristics such investment may well be cost-effective.

General conclusion

clarify the requirements of existing rules and regulations before the solution of specific problems. Some projects will be agreed upon inspecting public authorities only after installing the appropriate type of bellows for wiring. In any case, useful check current market conditions, the study of new products parameters. A wide range of profile products when used properly will help to realize certain plans with minimal cost.