Electrical Safety Clearance

Minimum Safety Clearance of Pipelines from Electrical Tower:

Description	Voltage
	33KV/66KV/132KV	220KV/400KV
The right of way (ROW) (widths on either side of the center line of overhead transmission lines )	25 Meter	50 Meter
Other than the roadways and boundary fences of security establishments any temporary or permanent structures / buildings, parapet walls,	Not within 25 Meter	Not within 50 Meter
With  All Underground  services crossing the way leave (from the nearest tower foundation)	35 Meter (Min)	50 Meter (Min)
The nearest side of the road reservation to the nearest tower foundation	25 Meter	35 Meter,50 Meter
The pipelines (water, oil/gas etc.) crossing (respectively away from the nearest base of tower leg). Pipe-lines shall not be laid parallel to the overhead line within the limits of a way leave (ROW).	25 Meter (Min)	35 Meter(Min) ,50 Meter(Min)
Cables crossing the transmission lines way leave (ROW) respectively away from the nearest base of tower leg.	25 Meter	35 Meter,50 Meter
Foundations and civil structures (Temporary or permanent) will not be permitted in the close proximity to the cable circuit. A minimum horizontal distance from such  structures to the nearest edge of the cable trench shall be observed	Min 1.5 Meter	Min 1.5 Meter

 Clearance among Electrical Line-Telephone- Water-Sewerage -Gas Line

Service	Vertical Clearance(Min)
Water Line (to cross below EHV cable level)	0.5 Meter
Sewerage Mains (to cross below EHV cable level)	1.0 Meter
Drainage Mains (to cross below EHV cable level)	0.5 Meter
Gas pipes	0.6 Meter
Telephone lines	0.5 Meter
LV / 11kV cables	0.5 Meter

 Safety Clearance for Excavation of Land :

Type of Excavation	Distance
Use of heavy mechanical excavators (other than hand operated pneumatic jack hammers) or driving sheet piles	Not less than 3 Meter from the edge of cable, cover, cable joint
Heavy machinery engaged in the civil construction or road works	operating load/thrust/ weight will not be applied directly on the cable installation
Trench excavations parallel to the cable installations	Minimum separation of 1 Meter to the nearest edge of cable tile
Laying of metal pipes over a long distance parallel to cable	Not permitted unless the Step and Touch Potentials at any point of the pipe line do not exceed 65 Volts.

 (A) Inside Towns

Distance between Tower’s foundation to Pipeline in parallel and intersections.

Voltage	Min Distance
380/220V	0.5 Meter
20KV	2 Meter
63KV	7 Meter
132KV	10 Meter
230KV and Above	20 Meter

Distance between underground power cables to wall of gas pipelines in parallel routes.

Voltage	Min Horizontal Distance	Min Vertical Distance
380/220V	1 Meter	0.5 Meter
20KV	2 Meter	1 Meter
63KV	3 Meter	1.5 Meter

(B) Outside of Towns:

 Distance between Tower’s foundation to Pipeline in parallel and intersections.

KV	Min Distance in Parallel Route (Up to 5 Km)	Min Distance in Parallel Route (Above 5 Km)
20KV	20 Meter	30 Meter
63KV	30 Meter	40 Meter
132KV	40 Meter	50 Meter
230KV	50 Meter	60 Meter
400KV	60 Meter	60 Meter

Distance between overhead lines to gas pipelines at intersections.

KV	Min Distance
20KV	8 Meter
63KV	9 Meter
132KV	10 Meter
230KV	11 Meter
400KV	12 Meter

Distance between Tower’s foundations to gas pipelines at intersections.

KV	Min Distance
20KV	20 Meter
63KV and Higher	30 Meter

Right Of Way (R.O.W) From Roads:

Highway	Distance
High Way : (38 meter from one side of Central Line of Highway)	76 Meter
First Class State Road=(22.5 meter from one side of Central Line of Highway)	45 Meter
Second Class State Road=(17.5 meter from one side of Central Line of Highway)	35 Meter
Third Class State Road =(12.5 meter from one side of Central Line of Highway)	25 Meter
Forth Class State Road=(7.5 meter from one side of Central Line of Highway)	15 Meter

General Electrical Safety Clearance:

KV	Description	Distance
Up to 11 KV	At points where the lines cross roads or railways	Min 6 Meter Height
Up to 11 KV	parallel to roads the	Min 5.5 Meter Height
Up to 11 KV	lines cross totally desert regions where no traffic is possible	Min 5.5 Meter Height
20 KV to 66 KV	All Location	Min 6 Meter Height
Up to 11 KV	Conductor Joint	No joint shall be closer than 3 meters to a point of support
33 KV & 66 KV	Conductor Joint	No tension joints shall be used unless specially approved. KV Min ROW 66 KV 18 Meter 132 KV 27 Meter 220 KV 35 Meter 400KV 52 Meter (Single Circuit) 400 KV 48 Meter (Double Circuit) Minimum clearances between Electrical Lines crossing each other: Voltage 66 KV 132 KV 220 KV 400 KV 66 KV 2.4 Meter 3 Meter 4.5 Meter 5.4 Meter 132 KV 3 Meter 3 Meter 4.5 Meter 5.4 Meter 220 KV 4.5 Meter 4.5 Meter 4.5 Meter 5.4 Meter 400 KV 4.5 Meter 5.4 Meter 5.4 Meter 5.4 Meter Permissible Min ground Clearance of Electrical Line: KV Ground Clearance Over National Highway 66 KV 6.1 Meter 8.0 Meter 132 KV 6.1 Meter 8.6 Meter 220 KV 7.0 Meter 9.8 Meter 400KV 8.8 Meter 10.8 Meter  Clearance for Telephone line Crossings Power Line: KV Clearance (Min) 66 KV 2.4 Meter 132 KV 2.7 Meter 220 KV 3.0 Meter  Vertical Clearance between Electrical Line and railway tracks. KV Clearance (Min) 66 KV 14 Meter 132 KV 14.6 Meter 220 KV 15.4 Meter 400 KV 17.9 Meter Clearance from Buildings to low, medium & high voltage lines: Voltage Description Distance Low & Medium Voltage Flat roof, open balcony, verandah roof ,When the line passes above the building a vertical clearance from the highest point 2.5 Meter Low & Medium Voltage Line passes adjacent to the building a horizontal clearance from the nearest point 1.2 Meter Low & Medium Voltage Line passes above the building a vertical clearance 2.5 Meter Low & Medium Voltage Line passes adjacent the building a Horizontal clearance 1.2 Meter 11 KV to 33 KV Line passes above or adjacent   to any building or part of a building 3.7  Meter Above 33 KV Line passes above or adjacent   to any building or part of a building 3.7+(0.3 for every additional 33 KV ) Up to 11 KV The horizontal clearance between the nearer conductor and any part of such building 1.2 Meter 11 KV to 33 KV The horizontal clearance between the nearer conductor and any part of such building 2.0 Meter Above 33 KV The horizontal clearance between the nearer conductor and any part ofsuch building 2.0 + (0.3 for every additional 33 KV ) Clearance above ground at the lowest conductor: Voltage Description Distance Low & Medium Voltage Across a street 5.8 Meter High Voltage Across a street 6.1 Meter Low & Medium Voltage Along a street 5.5 Meter High Voltage Along a street 5.8 Meter Low & Medium Voltage Elsewhere than along or across any street 4.0 Meter High Voltage Elsewhere than along or across any street 5.2 Meter 33 KV & EHV Clearance above ground(Add 0.3 Meter for every 33 KV Volts in 5.2 Meter) Min 6.1 Meter Vertical Clearance at Middle of Span: Span Vertical Clearance (At Middle of Span) 200 Meter 4.0 Meter 300 Meter 5.5 Meter 400 Meter 7.0 Meter 500 Meter 8.5 Meter Safety Clearance from Live Part in Outdoor Substation: KV Safety Working Clearance 12 KV 2.6 Meter 36 KV 2.8 Meter 72.5 KV 3.1 Meter 145 KV 3.7 Meter 220 KV 4.3 Meter 400KV 6.4 Meter 800 KV 10.3 Meter Lying of Telecommunication Cables with Power Cables (>33 kV). Cable Min. Distance Power cable of voltage exceeding 33 kV shall be laid Min 1.2 Meter depth Underground telecommunication cable shall be with underground power cable of voltage exceeding 33 kV. Min 0.6 Meter Separate from Power Cable Safe approach limits for people: Voltage 214V to 415 KV 11KV 33KV 66KV 132KV 275KV Person using manually operated tool 1.3 Meter 2.0 Meter 3.0 Meter 4.0 Meter 5.0 Meter 6.0 Meter Person using power operated tool 3.0 Meter 3.0 Meter 3.0 Meter 4.0 Meter 5.0 Meter 6.0 Meter