C. walnut

When we considered the main methods of connecting wires in the junction box, special attention was paid to the nut-type clamp. The product has a fairly simple design, but despite this it allows you to make the branch reliable and durable. The compression nut consists of a carbolite body, a steel plate and a plate, which actually compresses the cores with four bolts.

The small size of the nut, as well as its low cost, makes it one of the most popular taps for the power line. In turn, the disadvantages of the product are tight tightness (degree of protection IP 20), as well as the inability to branch wire connectors under voltage. It should also be noted that a very important advantage of the “nut” is the ability to qualitatively connect copper and aluminum conductors with a cross section from 1.5 to 150 ^mm2 .

All you have to do is place the stripped contacts in a special template and carefully tighten the screws with a screwdriver, then screw the case into place. More about the type of nut you can find out from our article.

Piercing clamps

Improved model of nut grip cable piercing clamps. However, disposable products allow you to branch the wire without cutting and even without removing the insulating layer when splicing it. The clamp design is represented by a hexagonal head that tightens the cores, as well as contact plates with teeth, which actually penetrate the insulating material.

They are mostly used to branch off air line laid SIP wire without strain relief.

The advantage of these products are as follows:

• You can branch wires from the overhead line (OHL) even when energized, without fear for your safety. This is due to the fact that the contact plate is securely isolated from the mounting screws.
• The body of the products is sealed and reliably protects the joint from adverse weather conditions.
• The clamps are easy to operate and have a long service life.
• Low production cost.
• Possibility of connecting copper and aluminum conductors.

As for the shortcomings, the main thing is just to “get rid of” the products, but this is a very controversial point, given the durability of this method of branching wires without breaking.

Installation is as follows:

OV type clamp

When repairing or replacing electrical wiring in an apartment, you can use another very good option for connecting wires – with the help of clamps such as ОВ. The products have the simplest design and no less simple principle of operation – the cable is placed in a special latch, which pierces the copper conductive insulation layer of the connector. As a result, in a matter of seconds, you can make a good branch from the mains cable (for example, to a power outlet).

As for the disadvantages of latches, the most important of them is the limited conditions of use – the cross-section of the cores should not exceed 6 ^mm2 . In turn, for household wiring of such a cross-section, it will be enough even to connect a powerful electric stove.

Video instructions for using the latch for wire branches without cutting

Polyethylene terminal blocks

A more outdated method of branching wire is to use terminal blocks (also called polyethylene terminal blocks). Built-in terminal blocks use is not recommended, because in this case, cutting and breaking the main core cannot be avoided. In addition, the terminal block also has disadvantages such as tight fit and the need to periodically tighten the clamp screw, especially if the connector is made of aluminum. As a result, you do not get any significant advantages during splicing and at the same time you get several serious disadvantages.

Serious development

Well, the last method of branching wires that can be used is to wind a new line with a branching wire without additional soldering or soldering. In this case, it is first necessary to strip the insulation of the conductors, after which the branch line must be screwed to the trunk line (as shown in the photo).

We draw your attention to the fact that when creating a twist, it is forbidden to connect aluminum and copper conductors. Conductors must be made of a single metal. In accordance with PUE clause 2.1.21. (Chapter 2.1 PUE) Twisting cannot be done at all – all connections must be welded, welded, crimped or fixed with clamps or terminal blocks. Therefore, to branch the wire, use the above methods or solder such twists.

Here, in fact, we have examined the most popular methods for wire branches without tearing or cutting. Now you know how to combine quality between two energy lines. Our advice – use piercing clips, which are among all the most trusted options!