Flush-mounted boxes

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Flush-mounted boxes

Flush-mounted boxes are a key element of any electrical installation. They protect electrical wiring connections and allow the attachment of accessories such as sockets and connectors . At the same time, the boxes provide convenient access to the wires. They have a flush-mounted structure - that is, they are embedded directly in the wall. This solution is characterized by high aesthetic values ​​and is highly functional because it does not take up space in the room.

Construction of a flush-mounted box

Each electrical box has a very similar structure. Such products perform the same function, i.e. they secure the connections of electrical installation cables and enable assembly of accessories. The boxes are made of a special self-extinguishing plastic. This is very important in the event of a possible short circuit and failure of the electrical system. Such properties of the material used are to protect against fire. It is also important that the material used does not emit harmful gases under the influence of high temperature.

Most junction boxes are fitted with screws that make the installation of a switch or socket much easier. The boxes also allow the installation of accessories with claws (i.e. expansion elements). Many products of this type have a modular structure, so they can be combined with each other when building an installation. The boxes have pre-cuts for cable entries and cable entries. They come in different sizes, allowing both cables and electrical conduits to be brought in.

Correct mounting of the box - including leveling and flush with the wall surface - allows for precise installation of connectors and sockets during finishing works. In the case of too deep a can seat, use distance rings with sizes adapted to the specific size of the can.

On the other hand, lids (caps) are used, for example, to cover the inside of a box while plastering walls during construction and renovation works.

Types of flush-mounted boxes

Flush-mounted boxes are divided according to various criteria. One of them is the possibility of mounting in a given type of substrate. Therefore, there are electrical installation boxes for concrete or plasterboard (also called hollow wall boxes). Due to the type of installation connections, boxes are divided into connecting (through) and end boxes.

The most commonly used flush-mounted boxes have a round shape and a size of 60 mm. However, depending on the specifics of the installation, you can also find larger products, as well as square boxes. Depth is also an important parameter - most often it is 40 mm. It is considered that such space is sufficient to connect installation wires and mount a socket or switch. For more demanding installations, deeper boxes are used - approx. 60 mm. Boxes are available not only in single versions, but also in double, triple, etc.

There are also hermetic cans that provide high protection against external factors. Thanks to this, you can place the box in the wall, which is sometimes exposed to moisture. This is possible thanks to the use of a number of sealing membranes. However, hermetic cans are much more common in surface-mounted versions.

The tightness of the junction box is presented using the IP scale. This value is given using two digits - e.g. IP 40 (the first one relates to, among other things, resistance to dust, and the second one to protection against moisture). The higher the number - the better the resistance. Installation boxes must provide protection at least IP 2X - that is, protect against access by a finger and elements with a diameter of more than 12.5 mm.

Manufacturers of this type of assortment also offer ceiling boxes, which are designed for the installation of lamps or chandeliers. Such an element can be equipped with a hook - a lighting holder that facilitates the installation of a pendant lamp.