Caps PPE, how to use and what are their advantages and disadvantages
According to the technical documentation (namely RB), the compound of veins in the junction box must be carried out: by crimping, welding, soldering or by the application of squeezing. In this article we'll consider in detail how this kind of compressing PPE caps, know what kinds they exist, and how to use them correctly.
What is in cap
This product consists of two parts:
1. Immediately cap itself made of a polymeric material that does not support combustion, and withstand voltage of 600 volts.
2. And a steel spring in the form of a cone, which is also electrochemically treated specialized staff.
For reliable fixation compound must accurately choose the size of the cap, it is only to be formed so dense and reliable connection of the wires.
The size and the right choice of caps
In our market, you can find both domestic and Chinese PPE caps. And they are available for five sizes of PPE-1 and PPE-5. And the biggest size is designed to connect live to 20 square meters. mm.
Note. Chinese purchasing caps, very seriously consider cross-section, because the declared value on the packaging may not reflect actual dimensions.
But the quality of the product can be checked as follows: take the cap and squeeze it. Quality product, though reluctantly, but will shrink, and then returns to its original position. A low-quality cap or do not sag, or simply burst from the effort.
Just when twisting the cap of low quality (especially when using a pair of pliers) plastic part can simply be destroyed.
Therefore it is better to draw their attention on domestic producers.
PPE of one of the domestic manufacturers: simple and enhanced.
PPE with the ears, of course, easier to use. That's just keep in mind that they occupy some more space in the control cabinet, and if there will be a lot of connections, they are trite not fit in it.
You probably noticed that the caps are made in different colors and each of them corresponds to a certain section of the connected conductors.
Note. One SIZom it is possible to connect and 6 wires. Most importantly, their total cross section was comparable to the cross section of the cap.
The algorithm is correct twist caps PPE
So, before you begin to use the cap, it is necessary to choose, because the correct choice will depend on the reliability of the connection.
For a correct choice will need to add live section that you want to connect.
For example, you need to connect three wires of 1.5 square. So, you have a total cross-section of 4.5 square.
From the table, select the desired cap in such a way that the resulting sum of the cross sections was not a boundary value, otherwise the cap does not provide a reliable contact.
It turns out that in this case suitable PPE-3 or 4-PPE.
Further, use one of two options:
The first method
We combine the wire without twisting, put the wire ends into the cap, and further dent and myself cranking the cap clockwise. After the inner spring grab strands begin twisting process.
Note. If just your fingers you can not properly tighten the PPE, and he does not have "ears", then we can help themselves a pair of pliers or a screwdriver with a nozzle.
By the way, there is even a special nozzle under a cap screwdriver for PPE.
The second way
In the second method it is just a preliminary Cores twisted. Once aligned end to get twisted, and then still going on wrapping the cap in a clockwise direction.
Moreover, the choice of method depends entirely on the section is twisted strands. You must agree very difficult to twist more wires with a cross section of 2.5 square meters. mm. cap. And break it thus will be easier than ever. But to perform twisting wires of 1 sq. mm.ne difficult.
What should be the twist
Manufacturers recommend to perform twist on the length not exceeding the length of the cap (typically 1 -1.2 cm).
But consider the following: if you twist, for example, four conductors, the twisting of 1.2 cm does not allow to create a good contact, so still have to increase its length.
Of course, this connection is no longer a full SIZom, but the connection is more important.
Pros and cons of PPE
The positive sides of the PPE include:
1. plastic shell gives just three types of protection: mechanical, fire, electric.
2. Caps PPE is permissible to use repeatedly.
3. Using PPE is easy to upgrade old twist. The main thing that they are twisted in a clockwise direction.
4. Such a connection does not require the use of specialized tools.
5. Installation is simple and fast.
By cons PPE may include:
1. Caps can not be applied to the stranded conductors.
2. This compound does not create a waterproof compound and wet areas inside them condensation can occur, which can lead to this result.
3. By conditional disadvantage is the size of the caps if the junction box connected to several groups of wires, you may have to use a larger box.
4. Also, such a compound does not give a sufficiently strong fixing and insulation compounds.
conclusions
This type of connection allows the wires to connect them quickly and without additional financial cost, as well as perfect for lighting groups. But the outlet line is better connected to each approved manner.
Thanks for attention!