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Apr 4, 2016 - Building

Better Installation Technologoy for Existing and New Construction

Easily accessible, simple to assign, transparent structures, and all of this according to standards: With the new mounting carrier, electricians can also use WAGO’s popular 221 Series COMPACT Splicing Connectors in distribution cabinets, and thereby also maintain the valid VDE standards. The carrier is particularly suited for retrofits, or for expanding the distribution cabinets. In new construction of distribution cabinets, WAGO also offers installation rail-mounted terminal blocks, which offer a multitude of advantages in comparison to installations using N/PE rails. Using this installation technology ensures future-oriented installations in all buildings.

The challenge in building technology is always to integrate more functions into increasingly smaller cabinets. Every millimeter counts, particularly when the existing electrical installations need to be expanded. With the 221 Series, WAGO offers electrical engineers lever-actuated splicing connectors that are particularly compact – a total of 40% smaller than their predecessors.

With the new mounting carriers, WAGO has succeeded in transferring the advantages valued in the 221 Series Splicing Connectors into the distribution cabinet itself. The carrier is suited for all connector variants. It guarantees easy servicing, inspection, maintenance, and accessibility, as well as simple assignment and testing of the connected conductors according to VDE 0100-510. The carrier can be snapped onto standard DIN rails horizontally or vertically, or screw-mounted to smooth surfaces. Due to the specific design, in which one side remains opens, the electrician has the option of using the operating lever for opening the connectors, even when inserted. Conductors can thus be conveniently connected and removed before or after inserting the connector into the carrier. The design also ensures that a test slot is always accessible, and the clamping unit can also be easily marked.

Proven Quality for New Distribution Cabinets

If the combination of 221 Series Splicing Connectors and Mounting Carrier enable an expansion of existing wiring installations that conform to standards, there is an even better solution for new building projects: wiring installations using installation rail-mounted terminal blocks, for example, using TOBJOB® S from WAGO. In this type of installation, the terminal blocks are snapped directly onto the DIN rail, providing faster electrical system wiring. Above all, WAGO’s proven Push-in CAGE CLAMP® Connection Technology saves time and ensures safety, because the terminal blocks establish a continuously good electrical connection.

With a glance at the future, building installations with rail-mounted terminal blocks expands the options for subsequent changes to or expansions of electrical systems, while reducing complications. As a practical feature, electricians can quickly loosen connections, and also have a clear wiring configuration with significantly more flexibility in circuit configuration, in comparison to installations using PE/N rails.

Building Safety

In addition to transparency and flexibility, safety in the electrical installations in buildings is a sensitive area in which small errors can have very large effects. The rules for proper installation and maintenance are correspondingly comprehensive. One safety measure is the so-called insulation resistance measurement. As every insulating fault conceals a potential hazard, the execution of this test is mandatory in fire-prone locations according to the building code DIN VDE 0100-482 and for public buildings according to DIN VDE 0100-718. In practice, installation terminal blocks are used almost exclusively due to the normative requirement that a simple measurement of the insulation resistance must be possible for conductors with cross-sections of less than 10 mm2 without branching off the conductor.

In addition to legally-mandated implementation, insulation resistance measurement is also a fixed component of voluntary tests. With an E-check, for example, renters of private or commercial real estate can multiply document the state of the electrical systems according to code, prior to transfer of the rental space. Some insurers have likewise recognized the advantages of the test and offer their customers reduced premiums if they regularly carry it out.

Insulation Resistance Measurement with Multilevel Installation Terminal Blocks

During the test, the insulation resistance is measured between the two live conductors and the PE conductor connected to the ground. The N and L potentials may be electrically connected to each other during the test – in order to prevent a risk to humans or animals, or damage to property and equipment. These measurements are only fast, safe, and accurate when carried out according to the standard, that is, if the neutral conductor can be separated via a mechanical device integrated into the terminal block, without having to disconnect the terminal block. Therefore, WAGO’s 2003 and 2005 Series TOPJOB® S Multilevel Installation Terminal Blocks have an N-disconnect slide link or an internal N knife disconnect.

Clear Lines in the Electrical System

The use of WAGO’s Installation Rail-Mounted Terminal Blocks also functions effectively in terms of image. Because the appearance of the switching cabinet presents the visible calling card of an electrical installing firm, a tidy, well-structured electrical cabinet provides real competitive advantages. The designation of each clamping unit with easily legible marking is likewise part of the professional appearance of a distribution cabinet. Within the TOPJOB® S Series, WAGO offers solutions for quickly and neatly marking the rail-mounted terminal blocks – up to 3 lines of text and easily legible when wired.


Installations using rail-mounted terminal blocks are increasingly replacing conventional connection technology using PE- and N-rails in building projects in renovations, and also in new construction. The system from WAGO can be flexibly adapted so that retrofits or expansions can be carried out in a way that saves time. In existing systems, WAGO’s new 221 Series COMPACT Splicing Connectors save both space and time. A carrier makes it possible to securely mount the connectors onto the carrier rail.


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