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Engineering Guide CDA3000
3 Selection of inverter module
3.2.1 Mains side/sys-
tem condition
DIN VDE 0100-300: 1996-01 distinguishes between three different mains
power systems. It is made especially clear how the IT system differs from
the TT and TN systems based on the means of ground connection.
Figure 3.1 IT, TN and TT systems
First letter - Link from the supply system to the ground:
T Direct connection of a point to the ground
I Either all active parts isolated from ground or one point connected
to ground via an impedance.
Grounding lead
PEN conductor
Neutral conductor
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