Electrical Safety Clearance (Part-2)
August 9, 2012 34 Comments
Code: Indian Electricity Rules/ Central Electricity Authority:
Right of Way Clearance (As per GETCO Standard):
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 |
thank you Mr. Parmar for this code
Dear sir,
First i would like to say great thanks to u..informations regarding electrical are very much useful for me and electrical engineers like me…i request u pls continue this sir..kindly separate the electrical notes area wise…pls release a book for standard electrical tips and notes .
Thank you sir….
Thanks Jignesh – very useful article. Really enjoy reading all your articles. Please keep it up !
Wow, What a Data given by You Sir ! This data is very much usefull in Practical life. I realy appriciate this chepter of Safety clearance of line from various …….. . Thanks again.
Thank you so much, Mr Jignesh.
Thank u sir for useful information.
I am getting a 4 storied house constructed thru a builder. can you please guide me the sizes of conductor that should be deployed depending upon load – like e te split ac, 25 lit geyser etc?
Dear Sir am From Neyveli, i have constructed a 2 story house near 230 kv Transmission line, our building clearance is horizontal 3.8 Meter, from second floor terrace vertical clearance 5.5 Meter, measured by eye sight, 230kv tower is 60 meter from the building.
Dear Sir am From Neyveli, i have constructed a 2 story house near 230 kv Transmission line, our building clearance is horizontal 3.8 Meter, from second floor terrace vertical clearance 5.5 Meter, measured by eye sight, 230kv tower is 60 meter from the building, is this distance is safe, please give me some conclusion or solution.
Thanks for sharing the information…. may I know how do they determine all those distances. Is there any study done. thanks
Relevant Standard or code is already mention.
what is the TTR meter?
Hi Mr.Parmar, thank you very much for information given, can you please advice some standard for Underground cable laying clearances to utility services like water gas, sewage etc? I am laying 66kV UG cable
Already Give in the Blog.
Please refer Electrical Safety Standard part 1 to 5 of this Blog
Excellent useful 4 clearnce building railway roads
Special thanks!
I’ld like to know the minimum clearance of 230kv line & Transformer when transformer is passing trought under 230kV line.
I would like to know the clearance of EHV line over national highways mentioned is as per which Notification? is it mentioned in any of the GOVT Gazzetes or NHAI notification or CEA Gazzete?
Thanks for the information.
please clarify that “can 220kV Power Line cross over 400kV line?”
if it so then how and what are the precautions to be taken?
if not possible then why?
Please clarify whether the IE Rule 1956 has been replaced by the CEA Regualtions, 2010
I appreciate the efforts that you are putting down to help people with various electrical safety measures that they need to take care when they start laying wiring for new building constructions. Thanks for these points and sharing with us.
Hi Jignesh, Thanks so much for the information. We have a HT line tower in our land and want to know the KV of that HT line. There are no boards or marks on the tower for any identification. Can you suggest any other way to find out the KV of the HT line.
what i understood that it is possible to construct a building within right of way of a overhead HT line if we maintain vertical clearance between top of building & OHT line. Is my understanding correct?
I am having a stone mines.Nearby around 20 metre away passing 220 KV line. Can I run my mines as per rules. Blasting work is also carried out in our mines.
Hello Mr.Parmar,
Have you come across the occasions where the utilities define the Right of Ways(RoW’s) depending upon the structure type, i.e whether the structures are Lattice, I-shape or V-shape insulators, Pole type structures with insulated cross arms etc?
RIGID BUS CLERANCE IN DIFFERENT VOLTAGES
We would like to make building construction near 400 KV HT line. How much shall be spacing left from 400 KV
tower center.
Dear sir could u plz certain sugation . I build a single ster house under over head transmission lines so any problems … Plz tell sir
Dear sir plz help me
i build a house in future under the over head transmission lines so any problems faced
Sir,
I have bought a residential plot in a pvt. Builder area. A 400 KVA line is located near my plot.
Please tell me how much distance is required to be maintain by builder from 400KVA line as per norms. And from where this distance measured , from center of line or extreme conductor etc. whether road in front of my plot also have to be spared for that distance.
Read about you and feel
you are great sir.
what is the difference between right of way and horizontal distance from the building
sir please tell me the clear spacing between conductors in over head lines( for 11 kv,33kv and 132 kv)
please let me know.. What should be the clearances required for under 66kV HT lines to nearest building??