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August 12, 2017 18:07

Terminals for wiring : what is it and why

types of terminals for wiring

In this spell the word is used quite often, although born from the familiar to many the term "terminal".By purpose any terminals - an ordinary wire connector, including with different electrochemical properties (e.g., copper and aluminum).Any terminal design should provide a reliable and safe contact of electric wires in the installation of electrical networks nodes, and first of all in distribution boxes.

Consider the basic options for easy and quick installation of electric wires contact via terminals.

  • Self-clamping terminals .The most simple mechanical mounting device for fixing the stranded conductors.Various sources are referred to as terminals snap, spring, quick mounting clamps, etc.The essence is the same: not even a very qualified electrician (as such among the majority of us) will be able to insert the wires into the socket and zakontachit them.The main thing is to choose the correct calibration of the holes.For networks 24A terminals are designed to range 0
    .75-2 mm², having from two to eight outputs, which fully covers the domestic electricity network needs.They are done in accordance with the safety requirements of fire-retardant plastic.Clip in the terminal by simply inserting the stripped wires under the plate.
    Self-clamping terminals
  • Screw connection terminals .The design is not the most successful, especially if you play in the mounting assembly is designed for a set of cross-sections, but quite popular.We note two such models lack.Firstly, to operate with a screwdriver with screw connection in a limited space is not always convenient.Second, the soft aluminum wiring at the terminal block in the work force can deform and break down over time.The advantages include low cost, small size and ability to connect wires of different materials, such as copper and aluminum.The quality of the housing allows safely mount these terminals in junction boxes raspaechnyh modifications.
    Screw connection terminals
  • PPE (insulating connecting terminals) .Compare these caps from a purely terminal blocks, perhaps it would be wrong.But they are quite suitable for the connection of single-phase conductors.Twisting inside PPE spoils the picture, but the other has not yet come up.
    Coedinitelnye insulating clamps

What to choose for electrical high: twisting or terminals

Here we have a contradiction between the practices and regulations.PUE (electrical installation rules) definitely require to carry out the wiring of electrical networks in residential and industrial buildings exclusively via terminal blocks.Experienced electricians assure that the sealed (tinned) twist not only provides better contact, but lasts longer.

truth, as always, is in the range of these extreme points of view.When you run your own hands wiring citizens are often faced with the inability to put their grand scheme to terminal boxes via terminals and internally connected insulated wires twisting.If this operation is carried out accurately, in the "pigtail" are identical electrical conductors, contact the place treated with rosin and a soldering iron, then what could be better.Especially convenient option adhesions in open wiring circuits in a country house, where a lot of branch points, and they are all newly installed.

terminal boxes

When the terminal block wiring is indispensable

There are a number of cases in which the terminal block is represented best or even the only way out and the situation.

  • compound incompatible chemical properties of conductors.In an old house with aluminum wiring you need to make a branch copper cable.Most modern terminals is carried out through an independent bus tokoperedachu equally rigged for metal oxide film.E ratios.resistance levels, and the system works reliably.
  • you decide to hang the new chandelier, connect the lamp.To put it simple: the main thing is not to forget what a streak which was connected, take the self-locking terminal block and repeat the connection quickly.
  • distribution of electrical equipment and, as a result, power supply circuit of a country house made correctly.You can expect that in this case, the terminals in the junction box be placed perfectly and save you from having to use a soldering iron and electrical tape.

Such examples are infinitely many, but one conclusion: if the terminal blocks for wiring someone came up, and they are widely used in electrical work, so it is useful and necessary thing.