Phase to Phase & Phase to Earth Clearance for Outdoor Switchgear
- The minimum clearance between phase to phase and phase to earth and sectional clearance for outdoor switchgear is given as below.
- This clearance is specified by considering impulse voltage withstand level.
- If the clearance is based on the transient overvoltage on the system, clearance may be higher in those cases.
|
Voltage
Rating- Highest system voltage kV ( RMS ) |
Impulse voltage
level kV ( Peak ) |
Minimum
Clearance to Earth ( mm ) |
Minimum Clearance
between Phases ( mm ) |
Minimum clearance
from any point where the man may be required to the nearest unscreened
conductor in air ( Sectional Clearance ) ( mm ) |
|
12 |
60 |
90 |
90 |
2600 |
|
|
75 |
120 |
120 |
2600 |
|
36 |
145 |
- |
270 |
2750 |
|
|
170 |
320 |
320 |
3000 |
|
72.5 |
325 |
630 |
630 |
3500 |
|
123 |
450 |
900 |
900 |
3500 |
|
|
550 |
1100 |
1100 |
4000 |
|
145 |
450 |
900 |
900 |
3500 |
|
|
550 |
1100 |
1100 |
4000 |
|
|
650 |
1300 |
1300 |
4000 |
|
245 |
650 |
1300 |
1300 |
4000 |
|
|
750 |
1500 |
1500 |
- |
|
|
850 |
1600 |
1600 |
4500 |
|
|
950 |
1900 |
1900 |
4500 |
|
|
1050 |
2400 |
2100 |
4500 |
|
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