General
Screw spacing	60 mm
Degree of protection	IP30
Rated insulation voltage	400 V AC
Certification	DIN EN 60670-1/-22 (VDE 0606-1/-22)
Material	halogen-free
Construction	2-part
Mounting	Magnetic or nail mounting
Sealing range	M16-M25
Combination capability	standard spacing 71 mm
Support post compatibility

The Spelsberg device box U 71 GRD is an underplaster installation housing for use in concrete and hollow walls. With dimensions of 71 x 71 x 50 mm and a screw spacing of 60 mm, it is designed for mounting switches, socket outlets and other electrical devices at the standard spacing of 71 mm. The housing consists of two parts and is designed for fixation using magnetic or nail mounting. An integrated drilling system with a membrane enables precise execution of drill holes in the designated sealing area M16 to M25. The box is compatible with support timber, allowing the use of support timbers for secure positioning during formwork.

Applications

The device box U 71 GRD is suitable for use in all types of formwork, including reverse formwork. It is used in electrical installations in residential and commercial buildings where a firm, permanent mounting of electrical components in concrete or hollow walls is required. The construction ensures secure and durable embedding in the wall structure, with the sealing function in the drill hole area supporting electrical insulation and mechanical stability.

Functions and Equipment in Detail

The product features a fully insulated cable transition, ensuring a safe and error-free connection of electrical conductors. The rated insulation voltage is 400 V AC, enabling use in typical low-voltage installations in the field of house and building electrical systems. The box is halogen-free, supporting the reduction of toxic fumes in the event of fire. The protection rating IP30 protects against entry of solid foreign objects with a diameter of at least 2.5 mm, providing basic protection against mechanical damage and dust.

Technology Explained Simply

The two-part construction of the box enables easy installation and secure anchoring in the structure. Magnetic or nail mounting offers flexibility for fixation in various wall structures. The integrated membrane for drilling facilitates precise execution of holes in the designated sealing area, ensuring electrical insulation and mechanical stability of the installation. The support-timber-compatible design allows the use of support timbers to hold the box precisely in position during formwork.

Compatibility and Accessories

The device box U 71 GRD is combinable at the standard spacing of 71 mm and can be supplemented with various accessories. These include support timbers in various lengths (e.g. STH 170, STH 190, STH 230, STH 240, STH 290), reinforcement adapters (IBT BWA), closure caps (VD 75, U71 VDF), compound brackets (VB71), blank sockets (U71 BSK-NA) and couplers (U71 KP-M5). These components support installation, protection and visual design of the installation.

Installation and Mounting

Mounting is carried out by fixing the box in the wall structure using magnetic or nail mounting. The integrated membrane enables precise execution of drill holes in the sealing area M16 to M25. The use of support timbers ensures correct positioning during formwork. After installation of the box, the wall is concreted, anchoring the box securely in the structure. Electrical conductors are connected via the fully insulated transition.

Operational Advantages

The device box U 71 GRD offers a robust and reliable solution for underplaster installation in concrete and hollow walls. The halogen-free design reduces fire hazard and the formation of toxic gases. The protection rating IP30 ensures basic protection against mechanical damage. Combinability at the standard spacing of 71 mm and compatibility with various accessories enable flexible and adaptable installation. The support-timber-compatible construction and the integrated membrane for drilling simplify installation and ensure precise and secure anchoring.

The box is certified to DIN EN 60670-1/-22 (VDE 0606-1/-22), confirming compliance with applicable standards for installation boxes. The rated insulation voltage of 400 V AC makes it suitable for use in typical low-voltage installations. The dimensions of 71 x 71 x 50 mm correspond to the standard for underplaster installations at the standard spacing of 71 mm.

Protection Rating

The protection rating IP30 protects against entry of solid foreign objects with a diameter of at least 2.5 mm. This is sufficient for use in indoor environments where no direct moisture or water exposure occurs.

Rated Insulation Voltage

The rated insulation voltage of 400 V AC is suitable for use in low-voltage installations in the field of house and building electrical systems.

Certification

The box is certified to DIN EN 60670-1/-22 (VDE 0606-1/-22), confirming compliance with standards for installation boxes.

Material and Environment

The box is halogen-free, supporting the reduction of toxic fumes in the event of fire.

Construction

The two-part construction enables easy installation and secure anchoring. Magnetic or nail mounting offers flexibility for fixation in various wall structures.

Sealing Area

The sealing area M16 to M25 enables precise execution of drill holes for electrical conductors.

Support-Timber Compatibility

The support-timber-compatible design allows the use of support timbers for secure positioning during formwork.

Combinability

The box is combinable at the standard spacing of 71 mm, enabling the installation of multiple devices in a row.

Accessory Compatibility

Compatible accessories include support timbers, reinforcement adapters, closure caps, compound brackets, blank sockets and couplers, supporting installation, protection and visual design of the installation.