Not so long ago, just a couple of years ago, in order to distribute electrical wiring in a residential building, there were 3 types of standard boxes. Today, taking into account the development of modern technologies, importers and manufacturers offer a large selection of such products.
Even in Soviet times, any junction box contained special clamps for reliable fixation, and also had several options for mounting to the wall. Like most things then produced, it was done in good faith and forever.
Today, a soldering box and terminal blocks are on sale separately. When choosing it, you must pay attention to the quality of the plastic of which it is made. If there is an unpleasant, sometimes cutting nose smell, it is better not to purchase such a box, as it will melt at the first heavy load.
Clamping part
As mentioned above, any junction box contains special terminals that directly contact the wires brought to the box. They are made from different types of metals. In most cases, it is aluminum or copper. This fact must be taken into account when choosing a box. The metal from which the terminals are made must match the one of which the wiring is made in the room. In case of their mismatch, electrochemical incompatibility arises, since each has its own characteristics. As a result, a reaction occurs leading to the formation of oxide on the surface of the wire, which can lead to a short circuit.
Features of electric clamping pads
Not all clamping terminals, as you can read above, are the same. Their main differences are the material used in their isolation, and shape. The material used in the production of insulating elements of clamping terminals for a product such as a soldering box can be polyethylene, polyamide, carbide, etc. They all differ in operating temperature and, accordingly, are used at different facilities.
Types of Terminal Blocks
Not all
terminal blocks available on the market today are completely identical. Their main difference is the material used for insulation and the very form of the mechanisms for clamping. Of the materials, polymers are often used: polyethylene, polyamide, carbide, etc. All their differences boil down to the ability to withstand different temperatures.
As a rule, polyethylene pads are white and resistant to any type of exposure to aggressive environments (solvent, water, salt, grease). This material is malleable, and cut effortlessly with a knife.
The polyamide terminals that the external junction box has do not support combustion, thereby eliminating the possibility of fire. They can be used on any type of object.
The terminal blocks that the junction box has for open wiring can also be spring-loaded. In such cases, it can also be used in industrial facilities, since the maximum voltage that it can withstand is 600 volts.