Electrical installation box with molded locking teeth

Abstract

Electrical installation box (1), in particular for installation in a preferably hollow cylindrical wall opening, comprising a preferably substantially hollow cylindrical housing (2) extending along an axis (A) and surrounding an installation space for installing an electrotechnical device, and at least two fixing elements (3) arranged on the outside of the housing (2) for force-fit fixing of the housing (2) in the wall opening, wherein the housing (2) is made of a first material and the fixing elements (3) are made of a second material different from the first material, characterized in that the housing (2) forms a base for each fixing element (3) which extends parallel to the axis (A) of the housing (2) and is rib-shaped.

Description

[0001] The present invention relates to an electrical installation box, in particular for installation in a preferably hollow cylindrical wall opening, comprising a preferably substantially hollow cylindrical housing extending along an axis and surrounding an installation space for the installation of an electrotechnical device.

[0002] For electrical installations in walls, e.g., made of masonry or external thermal insulation composite systems (ETICS), such electrical installation boxes are positioned in wall openings, particularly hollow cylindrical ones. To acoustically and thermally decouple the electrical installation box, the annular gap or space between the box housing and the inner wall of the opening is filled with construction or insulating foam.

[0003] A generic electrical installation box is shown in publication DE 44 28 811 C2.

[0004] A common problem when installing an electrical junction box is that the box housing doesn't have a secure hold in the wall opening before the gap is filled with expanding foam, for example, because the inner wall of the opening is uneven or imprecisely contoured. As a result, the expanding foam can push the electrical junction box out of the wall opening or cause it to shift within the opening.

[0005] The present invention is based on the objective of improving the electrical installation box in such a way that it can be securely fixed for installation in the wall opening for subsequent electrical installation.

[0006] The object of the invention is solved by the electrical installation box according to claim 1.

[0007] The present invention discloses an electrical installation box, particularly for installation in a preferably hollow cylindrical wall opening, comprising a preferably substantially hollow cylindrical housing extending along an axis and enclosing an installation space for installing an electrical device, and at least two fixing elements arranged on the outside of the housing for force-fit fixing of the housing in the wall opening, wherein the housing is made of a first material and the fixing elements are made of a second material different from the first material, characterized in that the housing forms a base for each fixing element, which extends parallel to the axis of the housing and is rib-shaped. Ideally, the second material is softer or more elastic than the first material.This makes the fixing elements particularly flexible, allowing them to adapt to the often imprecise or uneven inner contour of the wall opening. It is also possible, however, for the first material to be softer or more elastic than the second, so that the housing acts as a spring core, pressing the fixing elements against the inner wall of the wall opening. Preferably, the housing of the electrical installation box is made of polystyrene (PS) or polypropylene (PP). The fixing elements are preferably made of thermoplastic elastomer (TPE) or rubber. The base ensures the stability of the housing and results in high contact pressure of the fixing elements against the inner wall of a wall opening. The ribbed design of the base allows the housing wall to be held at a uniform distance from the inner wall of the wall opening around its entire circumference, enabling ideal foam filling of this annular space.

[0008] In an advantageous embodiment of the invention, the fixing elements have at least one of the following features: • The fixing elements are connected to the housing, preferably permanently connected, preferably molded onto the housing, most preferably by injection molding. This allows the fixing elements to be permanently or inseparably connected to the housing, so that they do not detach from the housing even in the harsh construction site environment. • The fixing elements are arranged regularly in the circumferential direction with respect to the axis of the housing. This facilitates the centering of the housing in the wall opening. • The fixing elements project radially outwards with respect to the axis of the housing. Because the fixing elements are exposed radially outwards, they can make particularly good contact with the inner wall of the wall opening. • The fixing elements terminate at the same distance from the axis of the housing, preferably at a distance of 30 to 50 mm, more preferably at a distance of 35 to 45 mm, and particularly preferably at a distance of 41 mm. This variant is particularly well suited for the centered installation of the electrical installation box in an opening with an inner diameter of 82 mm, which can be manually produced using a conventional core drill. • The fixing elements have a constant and / or uniform thickness in the radial direction with respect to the axis of the housing, the thickness preferably being in the range of 0.5 to 5 mm, more preferably in the range of 1 to 3 mm, and particularly preferably in the range of 1.5 to 2.5 mm. This allows the fixing elements to compensate well for unevenness in the inner wall of the wall opening and still ensure secure fixing of the electrical installation box. • The fixing elements have a constant and / or uniform width in the circumferential direction with respect to the axis of the housing, the width preferably being in the range of 0.5 to 5 mm, more preferably in the range of 1 to 3 mm, and particularly preferably in the range of 1.5 to 2.5 mm. This results in comparatively low friction of the fixing elements when inserted into the wall opening, allowing the electrical installation box to be easily inserted into the wall opening. • The fixing elements extend parallel to the axis of the housing, preferably over a length of 10 to 90%, and preferably over 25 to 75% of the housing length. This ensures stable positioning of the electrical installation box even along the entire length of the housing. • The fixing elements are designed in at least two different versions, wherein the fixing elements of the two versions preferably differ in length parallel to the axis of the housing and / or, in the case of a sawtooth design, in the number of teeth, wherein the fixing elements of the two versions are preferably arranged alternately in the circumferential direction with respect to the axis of the housing. This allows special design features of the electrical installation box, such as different membranes, to be implemented while maintaining the function of the fixing elements. • Two identical fixing elements extend along two diametrically opposite sides with respect to the axis of the housing. This facilitates the centering of the housing in the wall opening. • The fixing elements are arranged symmetrically to at least one plane enclosing the axis of the housing, preferably to two perpendicular planes that intersect at the axis of the housing. This further improves the centering of the housing in the wall opening. • At least one of the fixing elements, preferably several or all fixing elements, is / are designed as a series of locking teeth, wherein the series of locking teeth preferably has at least one of the following properties: ◯ The row of locking teeth extends parallel to the axis of the housing. This makes the electrical installation box easy to insert into the wall opening with low resistance. The row of locking teeth comprises a sawtooth-like contour on the side facing the housing and radially inward relative to the housing axis, and / or on the side facing outward and away from the housing axis. Due to the sawtooth-like contour on the radially inward-facing side connected to the housing (i.e., the inside), the fixing element is positively connected to the housing in the direction the electrical installation box is inserted into the wall opening, and thus cannot easily detach from the housing even with high resistance in the insertion direction. Due to the sawtooth-like contour on the side facing outward and away from the housing axis (i.e., the outside), several elastic tooth tips point outwards, which, in the case of imprecise orThe uneven inner contour of the wall opening can provide a secure hold for the electrical installation box in the wall opening. The row of locking teeth has a multitude of tooth tips that terminate at the same distance from the axis of the housing. This allows the electrical installation box to be centered particularly well in the wall opening. Each locking tooth in the series of locking teeth has a smaller angle of inclination (approx. 45°) relative to the axis of the housing in the insertion direction of the electrical installation box into the wall opening than in the opposite direction (approx. 90°), so that the electrical installation box is easier to insert into the wall opening than to remove. The angle of inclination of the tooth flanks relative to the axis of the housing in the insertion direction of the electrical installation box into the wall opening is, for example, in the range of 30 to 60°, preferably in the range of 40 to 50°, and more preferably at 45°. The angle of inclination of the tooth flanks relative to the axis of the housing opposite the insertion direction of the electrical installation box into the wall opening is, for example, in the range of 70 to 110°, preferably in the range of 80 to 100°, and more preferably at 90°.

[0009] It can be advantageous if the casing has at least one of the following features: • The housing has at least one flexible membrane, the membrane preferably having at least one of the following properties: ◯ The membrane is made from the second material. This simplifies the production of the electrical installation box. ◯ The membrane is manufactured using injection molding. This makes it particularly easy to produce a flexible membrane. The membrane is monolithic and forms a single unit with the fixing elements. The membrane is connected to the fixing elements, for example, via material webs or bridges. The membrane can be cut with a utility knife to create access for inserting an electrical or pipe cable into the installation space. A utility knife is a common tool on construction sites, allowing a cable to be inserted through the housing wall into the installation space without special equipment. When the membrane is cut, its sealing function is largely maintained even after the cable has been inserted, as only the cross-section necessary for the cable's passage is exposed. Due to its flexibility and elasticity, the cut membrane forms a largely tight seal against the outside of the cable. The membrane is designed to accommodate pipes with an outer diameter of 5 mm, 10 mm, 15 mm, 20 mm, and / or 25 mm. Such conduits are particularly common on construction sites. • The housing has an inner diameter of 50 to 70 mm, preferably 65 to 75 mm, and more preferably 60 mm. With these dimensions, the housing is particularly suitable for accommodating an electrical switch in the installation space. • The housing extends along its axis over a length of 50 to 100 mm, preferably 60 to 80 mm, and preferably 68 mm. This dimension also proves advantageous for accommodating an electrical switch in the installation space. • The housing has a first housing wall extending in a plane perpendicular to the housing axis, the housing wall preferably forming the bottom of the installation space and closing the housing at the rear. The first housing wall preferably has two circular openings, each sealed with a flexible membrane. Electrical or pipe lines can be inserted from the rear of the housing into the installation space through these membrane-sealed openings. Preferably, a passage is provided in the first housing wall, preferably centrally located. This passage may, for example, be designed as a one-way valve, through which a nozzle of a foaming tool can be inserted to fill an annular gap between the housing wall and an inner wall of a wall opening with insulating or construction foam.This has the advantage that the foam is evenly distributed in the annular gap between the housing wall and the inner wall of the wall opening and does not adversely affect the positioning or alignment of the electrical installation box in the wall opening. • The housing has at least one second housing wall extending in a plane parallel to the housing axis, wherein preferably two second housing walls extend on diametrically opposite sides with respect to the housing axis in two planes parallel to the housing axis, wherein preferably each second housing wall has a circular opening closed with a flexible membrane, wherein the second housing wall preferably has a coupling section for coupling the housing to the housing of another electrical installation box, wherein the coupling section frames the flexible membrane at least partially. An identical electrical installation box can optimally couple to this flat, second housing wall to establish communication between the respective installation spaces.Furthermore, the membrane on the outer casing makes it possible to insert electrical or pipe lines radially to the axis of the housing through the housing wall into the installation space. • The housing has at least one third housing wall, which is essentially cylindrical in shape, wherein preferably two third housing walls extend on diametrically opposite sides of the housing with respect to the axis of the housing, i.e., in the circumferential direction between each pair of second housing walls, wherein preferably each third housing wall has several circular openings of different sizes, each closed with a flexible membrane of corresponding size, wherein the third housing wall preferably has at least two different types of fixing elements, wherein the same type of fixing element is particularly preferably arranged between each pair of membranes of the same size. Preferably, the largest and smallest membranes of the electrical installation box are provided in the third housing wall.For example, the larger membranes of the electrical installation box are located closer to a sealed back of the housing than the smaller membranes. • The housing comprises an open end (front) and a closed end (back). Ideally, the open end (front) provides a large opening to the installation space. The closed end (back) prevents insulating foam from entering the installation space when filling the annular gap between the housing wall and an inner wall of a wall opening. • The housing forms a base for each fixing element, the base preferably having at least one of the following properties: The base has a sawtooth-like comb on which the fixing element is preferably arranged exclusively. This ensures that the fixing element is positively anchored to the housing and is difficult to detach from the housing even with high insertion resistance when the electrical installation box is inserted into the wall opening. The base has approximately the same dimensions as the fixing element with respect to the axis of the housing, both circumferentially and / or axially. This slim design of the base minimizes the insertion resistance when inserting the electrical installation box into the wall opening. Furthermore, it also results in minimal resistance for the insulating foam to be inserted into the annular gap between the housing wall and an inner wall of the opening.

[0010] It can prove helpful if the electrical installation box is manufactured using a two-component injection molding process, where preferably the housing is made of a first plastic and the fixing elements are made of a second plastic. This manufacturing technique proves to be particularly simple and precise with regard to the mass production of these components.

[0011] It can be advantageous if the first and second materials differ in at least one material property, preferably in hardness measured according to Shore A and / or Shore D, preferably measured according to DIN ISO 7619-1 and / or DIN 53505 and / or DIN EN ISO 868, wherein preferably the first material is harder than the second material. This allows the housing on the one hand and the fixing elements on the other to be equipped with features ideal for their respective functional purposes.

[0012] It can be advantageous if the electrical installation box has a cover for a hermetic seal. This prevents plaster from unintentionally penetrating the installation space when plastering the masonry.

[0013] It can be advantageous if the electrical junction box can be positively connected to at least one other identical electrical junction box, preferably in such a way that the axes of the positively connected electrical junction boxes are aligned parallel to each other and / or the installation spaces of both electrical junction boxes can communicate. The positive connection of several electrical junction boxes can be achieved, for example, by means of interacting male and female coupling sections. This also allows for the placement of multiple switches side by side in a wall, e.g., made of masonry.

[0014] It can be advantageous if the components of the electrical installation box made from the second material are monolithic, preferably starting from a front end of the electrical installation box in the insertion direction. This facilitates the production of these components in a single operation.

[0015] It can prove practical if the components of the electrical installation box made from the second material are connected by material bridges or webs. This variant proves advantageous with regard to the injection molding of the electrical installation box.

[0016] It can be advantageous if the membranes hermetically seal openings of different sizes in the housing. This allows cables of different diameters to be inserted through the housing wall into the installation space from different directions via different membranes.

[0017] It can be advantageous if the electrical installation box has a device for limiting the insertion depth of the housing into the wall opening, wherein this device preferably comprises at least two tabs extending in a plane perpendicular to the axis of the housing, preferably on diametrically opposite sides of the housing, so that when the tabs are in contact with the outside of the wall in which the wall opening is located, a substantially circular opening of the housing is situated at a distance of 1 cm from the wall, wherein each tab can preferably be detached from the housing without tools at a predetermined breaking point at the base of the tab. This allows the insertion depth of the electrical installation box into the wall opening to be limited such that a housing opening with access to the installation space lies exactly or substantially in the plane of the plaster surface.

[0018] Another aspect of the invention relates to a wall, in particular made of masonry or of an external thermal insulation composite system (ETICS), comprising a wall opening and an electrical installation box inserted into the wall opening according to one of the preceding embodiments, wherein a space between the housing of the electrical installation box and an inner wall of the wall opening is filled with insulating foam.

[0019] Another aspect of the invention relates to a method for installing the electrical installation box according to one of the preceding embodiments into a wall opening, comprising the steps: • Step A: Creating a wall opening in a wall, especially one made of masonry or an external thermal insulation composite system (ETICS). • Step B: Insert the electrical installation box into the wall opening so that the fixing elements securely fix the housing in the wall opening. • Step C: Filling the space between the housing of the electrical installation box and an inner wall of the wall opening with expanding foam.

[0020] In this process, the force-fit anchoring of the housing via the fixing elements according to step B ensures in particular that the electrical installation box is securely positioned in the wall opening when the annular space between the housing wall and the interior of the wall opening is foamed according to step C and is not displaced by the pressure of the foam or pushed out of the wall opening.

[0021] Further advantageous developments of the invention result from combinations of the features disclosed in the claims, the description and the figures. Terms and definitions

[0022] Essentially hollow cylindrical housing: A housing is described as essentially hollow cylindrical if its housing wall is at least partially cylindrical in shape. Such a housing may have flattened sections over parts of its circumference, as long as the partially cylindrical outer and / or inner contour of the housing is recognizable on the housing wall. In a hollow cylindrical design, the axis of the housing corresponds to the central axis of the cylinder that describes at least part of the housing wall.

[0023] Housing axis: The electrical installation box is designed for installation in a wall opening, which is preferably substantially hollow cylindrical. A hollow cylindrical wall opening is created, for example, with a round drill bit or a corresponding core drill. When the electrical installation box is installed, the axis of the housing is preferably aligned with, or coincides with, the central axis of the wall opening. The electrical installation box can preferably be inserted into the wall opening along the axis of the housing.

[0024] Electrical installation box: The electrical installation box is intended for electrical installations, particularly in walls made of masonry or an external thermal insulation composite system (ETICS). However, this intended use is merely one possible use of the electrical installation box according to the invention, but not the only possible use. In particular, the electrical installation box can also be installed in ceiling or floor openings. The term "wall opening" describes the intended use and should not be understood to mean that the electrical installation box can only be installed in a wall opening. Similarly, the term "electrical installation box" describes the intended use of this item, but the term should not be understood to mean that only electrical installations can be accommodated or carried out in the housing. Brief description of the characters

[0025] They show: Fig. 1 different perspective views of an electrical installation box according to the invention from different viewing directions, wherein view (a) shows in particular the front, view (b) shows in particular a long side and view (c) shows in particular a back of the electrical installation box. Fig. 2 a schematic sectional view of an installation state in which an electrical installation box according to the invention is installed in a hollow cylindrical wall opening, wherein the annular space between the housing of the electrical installation box and the inside of the wall opening is filled with foam. Detailed description of the preferred embodiment

[0026] The electrical installation box 1 according to the preferred embodiment, which is described below with reference to the drawings, is configured in particular for installation in a preferably hollow cylindrical opening in a wall (wall opening) W, e.g., made of masonry or an external thermal insulation composite system (ETICS). A wall W made of masonry is constructed, for example, from individual bricks made of calcium silicate, aerated concrete, or brick. A hollow cylindrical wall opening is created, for example, in the wall W using a round drill with a core diameter of 82 mm. The depth of the wall opening is, for example, in the range of 70 mm to 100 mm, measured from a surface of the wall W.

[0027] In the present embodiment, the electrical installation box 1, manufactured, for example, by 2K injection molding, comprises an approximately hollow cylindrical housing 2, which extends along an axis A and surrounds an installation space for the installation of an electrotechnical device, wherein various elastic or flexible fixing elements 3 for force-fit fixing of the housing 2 in the wall opening are molded onto the outside of the housing 2 by injection molding.

[0028] The fixing elements 3 are each designed as a series of locking teeth extending parallel to the axis A of the housing 2. These teeth have a sawtooth-like contour on both the side facing radially inward with respect to the axis A of the housing 2 and connected to the housing, and on the side facing radially outward with respect to the axis A of the housing 2 and repelling the housing 2. All tooth tips of these locking teeth are located at a distance of approximately 41 to 42 mm from the axis A of the housing 2, allowing the electrical installation box 1 to be inserted into the exemplary wall opening with an inner diameter of 82 mm. The electrical installation box 1 can be dimensioned accordingly for other wall openings. Each locking tooth in the series of locking teeth has a smaller angle of inclination of approximately 41 to 42 mm relative to the axis A of the housing 2 when the electrical installation box 1 is inserted into the wall opening.45° upwards, as in the opposite direction, where the angle of inclination to axis A of housing 2 is approximately 90°. This makes it easier to insert the electrical installation box 1 into the wall opening than to pull it out.

[0029] The housing 2 forms a base for each fixing element 3, which extends in a rib-like manner and with a sawtooth-like ridge parallel to the axis A of the housing 2. The respective fixing element 3 sits on the sawtooth-like ridge of the base in a form-fitting and material-locking manner.

[0030] The housing 2 has several flexible membranes 4 or 4a, 4b, 4c in various housing walls 2a, 2b, 2c, each of which can be cut with a utility knife to create access for the insertion of an electrical or pipe cable into the installation space. The membranes 4a, 4b, 4c – like the fixing elements 3 – consist of the second material and are monolithically and integrally connected to them via material bridges.

[0031] Housing 2 has an inner diameter of 60 mm and a length of 68 mm.

[0032] A first housing wall 2a extends in a plane perpendicular to the axis A of the housing 2. The first housing wall 2a forms the base of the installation space and closes the housing 2 at the rear. The first housing wall 2a has two circular openings with a diameter of approximately 10-15 mm, each sealed with a flexible membrane 4a made of the second material.

[0033] The housing 2 also has two second housing walls 2b, which extend in two planes parallel to the axis A of the housing 2 on diametrically opposite sides. Each second housing wall 2b includes a circular opening which is closed with a flexible membrane 4b. The second housing wall 2b also has a male or female coupling section 6a, 6b for coupling the housing 2 to the housing 2 of another electrical installation box 1. The coupling section 6a, 6b frames the flexible membrane 4b at least partially.

[0034] Two essentially cylindrical, third housing walls 2c extend diametrically opposite sides of the axis A of the housing 2, i.e., circumferentially between each pair of second housing walls 2b. Each third housing wall 2c includes several circular openings of different sizes, each closed with a flexible membrane 4a, 4c of corresponding size. The third housing wall 2c has two different versions of fixing elements 3. The same version of fixing elements 3 is arranged between each pair of membranes 4c of the same size. The fixing elements 3 of the two versions differ both in their length parallel to the axis A of the housing 2 and in the number of teeth.As can be seen in the drawings, the fixing elements 3 of the two variants are arranged alternately circumferentially with respect to the axis A of the housing 2, with two identical fixing elements 3 extending on two diametrically opposite sides with respect to the axis A of the housing 2. The first variant of fixing elements 3 extends over a length of approximately 80% of the length of the housing 2 circumferentially between two large membranes 4a. The second variant of fixing elements 3 extends over a length of approximately 40% of the length of the housing 2 circumferentially between two small membranes 4c. That is, the second variant of fixing elements 3 has approximately half the length or half the number of teeth as the first variant.

[0035] To limit the insertion depth of the housing 2 into the wall opening, the electrical installation box 1 has two tabs 5 that extend on diametrically opposite sides of the housing 2 in a plane perpendicular to the axis A of the housing 2. When the tabs are in contact with the wall in which the wall opening is located, a substantially circular opening of the housing 2 is positioned 1 cm from the wall. This distance corresponds to the thickness of the plaster. Each tab 5 can be detached from the housing 2 without tools at a predetermined breaking point at the base of the tab 5.

[0036] An exemplary procedure for installing this electrical installation box 1 in a wall opening includes the following steps: Step A: Creating an opening (wall opening) in a wall W, in particular made of masonry or an external thermal insulation composite system (ETICS). Step B: Insert the electrical installation box 1 into the wall opening so that the fixing elements 3 securely fix the housing 2 in the wall opening. Step C: Foaming the space between the housing 2 of the electrical installation box 1 and the wall opening.

[0037] Step A is carried out, for example, using a standard core drill bit with an outer diameter of 82 mm. This creates a hollow cylindrical wall opening W with an inner diameter of approximately 82 mm.

[0038] In step B, the electrical installation box 1 is inserted into the hollow cylindrical wall opening, preferably after the cables to be connected have been fed through the housing wall into the installation space in the housing 2. For this purpose, the corresponding membranes 4a, 4b, and 4c are slit, for example, with a utility knife, and the membranes 4 are pierced from the outside of the housing 2 with the cable end to be connected, displacing the elastic material. The fixing elements 3 hold the inserted housing 2 centered in the wall opening, with the housing wall positioned at a predetermined distance from the inner wall of the wall opening, so that a uniform annular gap with a width of approximately 10 mm is formed around the housing wall. Ideally, the first housing wall 2a, or the base of the housing, has a distance of approximately 10 to 20 mm from the bottom or the back of the wall opening.The tabs 5 projecting radially from the housing 2 limit the maximum insertion depth of the electrical installation box 1, so that the opening to the installation space of the housing 2 is positioned at a distance of 1 cm from the surface of the wall according to the plaster thickness.

[0039] In step C, the annular gap between the housing 2 and the inner wall of the wall opening is filled with expanding foam to thermally and acoustically insulate the electrical installation box 1 and decouple it from the wall W. To fill the annular gap, the nozzle of an expanding foam tool can be inserted into the installation space of the electrical installation box 1. Through an opening or valve in the center of the first housing wall 2a of the housing 2, expanding foam can be injected at the rear of the housing 2 and from there into the annular gap. This displaces the air present in the annular gap and completely fills it with foam.

[0040] Before the wall W is subsequently plastered, a cover is placed on the housing 2, which hermetically seals the installation space in the housing 2. The cover is embedded in the plaster P and subsequently removed to make the installation space in the housing 2 accessible for subsequent electrical installation. Reference symbol list 1 electrical installation box 2 cases 2a First housing wall or rear wall or housing bottom 2b Second case wall (flat) 2c Third housing wall (cylindrical shell section-shaped) 3 fixing element 4 Membran 4a First membrane (with star-shaped support structure) 4b Second membrane (with circular reinforcing rib) 4c Third Membrane 5 tabs 6a Male coupling section 6b Female coupling section Axis L line P Putz W masonry or wall

Claims

[1] Electrical installation box (1), in particular for installation in a preferably hollow cylindrical wall opening, comprising a preferably substantially hollow cylindrical housing (2) extending along an axis (A) and enclosing an installation space for the installation of an electrical device, and at least two fixing elements (3) arranged on the outside of the housing (2) for force-fit fixing of the housing (2) in the wall opening, wherein the housing (2) is made of a first material and the fixing elements (3) are made of a second material different from the first material, characterized by , that the housing (2) forms a base for each fixing element (3) which extends parallel to the axis (A) of the housing (2) and is rib-shaped. [2] Electrical installation box (1) according to claim 1, characterized by that the fixing elements (3) are integrally formed on the housing (2), preferably by injection molding. [3] Electrical installation box (1) according to any one of the preceding claims, characterized by , that the fixing elements (3) are designed as rows of locking teeth, each row of locking teeth preferably having at least one of the following properties: a. The row of locking teeth extends parallel to the axis (A) of the housing (2). b. The series of locking teeth comprises a sawtooth-like contour on the side that is radially inward with respect to the axis (A) of the housing (2) and connected to the housing and / or on the side that is radially outward with respect to the axis (A) of the housing (2) and repelled from the housing (2). c. The row of locking teeth has a plurality of tooth tips that terminate at the same distance from the axis (A) of the housing (2). d. Each locking tooth of the series of locking teeth has a smaller angle of inclination in the insertion direction of the electrical installation box (1) into the wall opening relative to the axis of the housing (2) than in the opposite direction, so that the electrical installation box (1) is easier to insert into the wall opening than to pull out. [4] Electrical installation box (1) according to any one of the preceding claims, characterized by , that the fixing elements (3) are designed in at least two different variants, wherein the fixing elements (3) of the two variants preferably differ in length parallel to the axis (A) of the housing (2) and / or in the case of sawtooth design by the number of teeth, wherein the fixing elements (3) of the two variants are preferably arranged alternately in the circumferential direction with respect to the axis (A) of the housing (2). [5] Electrical installation box (1) according to any one of the preceding claims, characterized bythat the housing (2) has at least one flexible membrane which can be cut with a utility knife to provide access for the insertion of a pipe into the installation space (3). [6] Electrical installation box (1) according to any one of the preceding claims, characterized by , that the base has a sawtooth-like comb on which the respective fixing element (3) is arranged. [7] Electrical installation box (1) according to any one of the preceding claims, characterized by , that the electrical installation box (1) is manufactured using a 2K injection molding process, wherein preferably the housing (2) is made of a first plastic and the fixing elements (3) are made of a second plastic. [8] Electrical installation box (1) according to any one of the preceding claims, characterized bythat the first material and the second material differ in hardness as measured by Shore A and / or Shore B, wherein preferably the first material is harder than the second material. [9] Electrical installation box (1) according to any one of the preceding claims, characterized by , that the electrical installation box (1) has a cover for the hermetic sealing of the housing (2). [10] Electrical installation box (1) according to any one of the preceding claims, characterized by , that the components of the electrical installation box (1) formed from the second material are monolithic, preferably starting from a front end of the electrical installation box (1) in the insertion direction, wherein the components of the electrical installation box (1) formed from the second material are preferably connected by material bridges or webs. [11] Electrical installation box (1) according to any one of the preceding claims, characterized by, that the electrical installation box (1) has a device for limiting the insertion depth of the housing (2) in the wall opening, wherein this device preferably comprises at least two tabs (5) which extend in a plane perpendicular to the axis (A) of the housing (2), preferably on diametrically opposite sides of the housing (2), so that when the tabs (5) are in contact with the wall (W) in which the wall opening is located, a substantially circular opening of the housing (2) is located at a distance of 1 cm from the wall (W), wherein each tab (5) is preferably detachable from the housing (2) without tools at a predetermined breaking point at the base of the tab (5). [12] Masonry comprising a wall opening and an electrical installation box (1) inserted into the wall opening according to one of claims 1 to 11, wherein a space between the housing (2) of the electrical installation box (1) and an inner wall of the wall opening is filled with insulating foam. [13] Method for installing the electrical installation box (1) according to any one of claims 1 to 11 into a wall opening (W), comprising the steps: a. Step A: Creating an opening in a wall (W), especially one made of masonry or of an external thermal insulation composite system (ETICS). b. Step B: Insert the electrical installation box (1) into the wall opening so that the fixing elements (3) forcefully fix the housing (2) in the wall opening. c. Step C: Foaming the space between the housing (2) of the electrical installation box (1) and an inner wall of the wall opening.

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