17
6.7 Grounding
After the transformer is installed, ensure that the transformer body and enclosure are reliably grounded.
Maximum voltage Um
①
of the equipment
(Effective value)
Rated lightning impulse withstand voltage LI
①
Minimum clearance value
List 1
List 2
a
b
c
d
kV
kV
kV
mm
mm
mm
mm
12
-
75
120
*
50
40
24
95
-
160
*
80
50
24
-
125
220
*
100
70
36
145
-
270
*
120
90
36
-
170
320
*
160
110
①
See IEC 60071
* If there is a high-voltage tap on this side, parameters of column 'a' shall apply to column 'b'; Otherwise, column 'c' applies.
6. Installation