The number of electric vehicles, heat pumps and solar systems is rising significantly as part of the energy transition, which is putting a strain on the power grid. In order to guarantee grid stability, §14a of the German Energiewirtschaftsgesetzes (EnWG) has applied to grid connections since 1 January 2024. According to §14a EnWG, the connection of charging stations and/or heat pumps may no longer be declined.
However, the grid operator can throttle controllable consumption devices for up to two hours a day if there is a risk of overload. Accordingly, a minimum power remains available at all times. The digitalisation of the low-voltage grids in accordance with Section 14a of the German Energiewirtschaftsgesetzes (EnWG) is essential for a stable power grid.
The implementation of §14a of the EnWG may vary depending on the region and public utilities. This information must be available for implementation and differs in a version with switchable relays or the connection of the control cable to terminal blocks with longitudinal separation.
Relay strip: For controllable consumption devices, control is based on the FNN pulse for relay assignment of §14a EnWG systems via various relay outputs. The terminal strip for the transfer point is optional, depending on the requirements of the respective TAB.
Terminal strip: The 8 wires of the control cable are routed via terminals with longitudinal separation. In addition, a terminal strip is required at the transfer point for the later connection of the control box.
For some technical connection conditions from the German-speaking countries, we offer prefabricated strips according to the respective TAB. You can find an overview of these terminal strips here:
The "VDE FNN" terminal strip is designed in accordance with the "VDE FNN note for meter stations with semi-indirect measurements up to 1000 A in low voltage (for transformer systems)". It refers to version 1.0 from June 2022 and is used to standardize semi-indirect measurements (transformer measurements). This note is to be applied together with VDE-AR-N 4100:2019 and VDE-AR-N 4100 authorization 1:2019. The terminal blocks are designed with the PUSH IN connection technology.
The "TAB NS Nord 22" terminal strip is structured in accordance with the standard wording for technical connection conditions under the title "TAB NS NORD 2019" (TAB 2019). It is responsible for the connection and operation of plants on the low-voltage grid in the area of the BDEW regional group Northern Germany together with the BDEW regional group Berlin/Brandenburg. The terminal blocks are designed with the PUSH IN connection technology. Please always refer to the supplementary sheets of the respective grid operator.
The "TAB NS Nord 14" terminal strip is structured in accordance with the standard wording for technical connection conditions under the title "TAB NS NORD 2019" (TAB 2019). It is responsible for the connection and operation of plants on the low-voltage grid in the area of the BDEW regional group Northern Germany together with the BDEW regional group Berlin/Brandenburg. The terminal blocks are designed with the PUSH IN connection technology. Please always refer to the supplementary sheets of the respective grid operator.
The "VDE FNN" terminal strip is designed in accordance with the "VDE FNN note for meter stations with semi-indirect measurements up to 1000 A in low voltage (for transformer systems)". It refers to version 1.0 from June 2022 and is used to standardize semi-indirect measurements (transformer measurements). This note is to be applied together with VDE-AR-N 4100:2019 and VDE-AR-N 4100 authorization 1:2019. The terminal blocks are designed with the screw connection technology.
The "LST_CTVT_3PHASEPEATTB" terminal strip is a setup for 3 current and voltage transformers with N and PE connection. The 3 phases are color coded on the current transformer side with yellow (L1), green (L2) and violet (L3). In addition, the structure has the forced short-circuit function (MBB - Make Before Breake) and comparison measurement function.
The "LST_CTVT_3PHASEPEWTTB" terminal strip is a setup for 3 current and voltage transformers with N and PE connection. The 3 phases are color coded on the current transformer side with yellow (L1), green (L2) and violet (L3). In addition, the structure has the forced short-circuit function (MBB - Make Before Breake) and comparison measurement function.
The terminal strip "LST_CT_3PHASE_ATTB_OR" is an assembly of 6 terminals for 3 current transformers. The 3 phases have the has the forced short-circuit function (MBB - Make Before Breake) and comparison measurement function.
The ConnectorGuide shows you a representative selection of products especially for smart meter applications. The overview will show you the application as you know it. Move the cursor over the markings to find out information on the connection technology for sub-assemblies and components. And it’s just a few more clicks from here to your desired product.
A smart meter is an intelligent electricity meter that digitally records and stores energy consumption and transmits it to energy suppliers or other systems via communication interfaces. It enables transparent and efficient energy management.
In Germany, the Metering Point Operation Act (MsbG) regulates the introduction and operation of smart meters. It obliges grid operators and metering point operators to equip certain consumer groups with smart metering systems.
A smart metering system is made up of a modern measuring device (mME) and a smart meter gateway (SMGW), which is responsible for communicating with external systems.
Smart meters generally have the following connection technologies:
The connection is made via standardised terminals (e.g. Weidmüller terminals) in the meter cabinet. The wiring must comply with the current regulations (DIN VDE 0100).
The meter cabinet must be equipped in accordance with DIN VDE 0603-1 and VDE-AR-N 4101.
Data transmission takes place via the smart meter gateway. Common protocols are:
Yes, many smart meters support open interfaces such as KNX, Modbus or BACnet, which enable integration into smart home systems.
Here you will find all important information and documents on the implementation of §14a EnWG and round the topic of smart metering. Download technical documentation on the relay blocks and terminal blocks, the requirements of §14a EnWG and our product range.
Secure documents now and successfully implement §14a EnWG!
Beck, Hubert
