The minimum
distance between transmission line conductor and ground is given as per Indian
Electricity rules 1956 is given as below.
Clearance between lowest conductor of the transmission line and ground
- The overhead line conductors including service lines do not erected across street at height less than
Low and medium
voltage
|
5.8 meters
|
High voltage
|
6.1 meters
|
- The overhead line conductors including service lines do not erected along any street at height less than
5.5 meters
|
|
5.8 meters
|
- The overhead line conductors including service lines do not erected elsewhere than along or across any street at height less than
Low, medium
and high voltage lines up to and including 11 kV ( bare conductor )
|
4.6 meters
|
Low, medium
and high voltage lines up to and including 11 kV ( Insulated conductor )
|
4.0 meters
|
High voltage
lines above 11 kV
|
5.2 meters
|
Extra high voltage transmission lines
|
5.2 meter +
0.3 meter per 33 kV ( The minimum clearance along or across any street should
not be less than 6.1 meters )
|
Clearance between conductors and trolley wires
Low and medium
voltage
|
1.2 meters ( When
insulated conductor suspended with wire crosses over a trolley wire, the
minimum clearance should be 0.6 meter )
|
High voltage
line up to 11 kV
|
1.8 meters
|
High voltage
line above 11 kV – 2.5 meters
|
2.5 meters
|
Extra high voltage lines
|
3.3 meters
|
Clearance from building of low and medium voltage lines and service lines
- Low or medium voltage line passes above or adjacent to any building, the minimum clearance should be
Flat
roof, veranda roof, leans to roof and open balcony
When line
passes above building
|
Vertical distance
of 2.5 meter from highest point of building
|
When line
passes adjacent to the building
|
Horizontal clearance
of 1.2 meters from nearest point of building
|
Pitched
roof ( Roof with slopping surface with angle > 20 degree )
When line
passes above building
|
Vertical distance
of 2.5 meter immediately under the lines
|
When line
passes adjacent to the building
|
Horizontal clearance
of 1.2 meters
|
- If any conductor situated as to have a clearance less than the specified shall be proper insulated and shall be attached at suitable interval to bare earthed bearer wire having breaking strength not less than 350 kg.
- The horizontal clearance is measured when line is at maximum deflection from vertical due to wind pressure.
Clearance from building from high and extra high voltage
- When high voltage or extra high voltage passes adjacent or above the building, the vertical distance between highest points of tower is calculated by considering sag in the lines.
- The distance between highest point of the building and line should not less than
High voltage up
to and including 33 kV
|
3.7 meters
|
Extra high
voltage lines
|
3.7 meter +
0.30 meters per additional 33 kV
|
- The horizontal distance between any building and transmission line considering maximum deflection due to wind pressure should not be less than
High voltage up
to and including 11 kV
|
1.2 meters
|
High voltage
line above 11 kV and up to 33 kV
|
2.0 meters
|
Extra high
voltage lines
|
2.0 meters +
0.3 meters per additional 33 kV
|
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