Elli Charger 2: Note on network compatibility (TT/TN/IT systems)
Note regarding network type (TT/TN/IT systems) for the Elli Charger 2
The Elli Charger 2 is basically for operation in a TN network designed as is common in many residential areas and new buildings.
What is a TN network?
The TN network Terra Neutral is the standard in residential and commercial areas in Germany and many other countries. Here, the neutral conductor is directly connected to earth, and the protective conductor and neutral conductor are already connected at the service entrance. This system ensures stable and reliable fault current detection.
The Elli Charger 2 is fully designed for use in TN networks. and works reliably and without problems – without any additional measures by the installer.
What about a TT network?
A TT network (Terra-Terra) is also technically usable, but only under certain conditions:
The wallbox is on a Grounding resistance of maximum 1 ohm If this limit is exceeded, the wallbox switches to error mode and the charging process is prevented.
According to the manufacturer, complying with this limit value in the TT network is proving difficult in practice. often considered difficult, because the grounding resistance is typically high there over 1 ohm It is located. Therefore, it can only be used if an electrician measures the resistance and it remains permanently below 1 ohm.
How can you tell which network you have?
Whether you have a TN- or TT network is available, can only one electrical specialist company This can be reliably determined. This is usually done through a visual inspection and measurement in the house connection box.
Where are TT networks commonly found?
- in rural regions
- at older buildings
- at Individual systems with its own grounding
- Occasionally, in older installations, despite modernization...
What about an IT network?
A IT network (Isolated network) is mainly used in specialized applications – e.g., in hospitals, industrial plants, or on ships. In this system, the neutral point of the power grid is not directly grounded.
The Elli Charger 2 is not suitable for IT networks.. In these environments, the necessary ground potential for proper functioning is lacking. Therefore, the wallbox could do not function correctly or do not start at all.
Conclusion:
- TN network: fully supported, recommended network configuration
- TT network: conditionally supported, Only required if the ground resistance is ≤ 1 ohm and prior testing by an electrician is necessary!
- IT network: not suitable