08/03/2022

Minimum Electrical 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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