|Oznaka |Okrajšava|Nazivna napetost |
+-----------+---------+--------------------------+
|visoka | | |
|napetost | VN |400 kV, 220 kV, 110 kV |
+-----------+---------+--------------------------+
|srednja | | |
|napetost | SN |35 kV, 20 kV, 10 kV |
+-----------+---------+--------------------------+
|nizka | | |
|napetost | NN |0,4 kV |
+-----------+---------+--------------------------+