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Home / Technical Articles / Electrical Safety Standards for LV/MV/HV (Part-3)
Electrical Safety Standards for LV/MV/HV part 3
Electrical Safety Standards for LV/MV/HV part 3 (On photo transmission tower in India)

Continued from part 2Electrical Safety Standards for LV/MV/HV (Part-2)

Content

Standard: Northern Ireland Electricity (NIE), 6/025 ENA

Code: Indian Electricity Rules / Central Electricity Authority

  1. Right of Way Clearance (As per GETCO Standard)
  2. Minimum clearances between Electrical Lines crossing each other
  3. Permissible Min ground Clearance of Electrical Line
  4. Clearance for Telephone line Crossings Power Line
  5. Vertical Clearance between Electrical Line and railway tracks
  6. Clearance from Buildings to low, medium & high voltage lines
  7. Clearance above ground at the lowest conductor
  8. Vertical Clearance at Middle of Span
  9. Safety Clearance from Live Part in Outdoor Substation
  10. Lying of Telecommunication Cables with Power Cables (>33 kV)
  11. Safe approach limits for people

Code: Indian Electricity Rules / Central Electricity Authority

Right of Way Clearance (As per GETCO Standard)

KVMin ROW
66 KV18 Meter
132 KV27 Meter
220 KV35 Meter
400KV52 Meter (Single Circuit)
400 KV48 Meter (Double Circuit)

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Minimum clearances between Electrical Lines crossing each other

Voltage66 KV132 KV220 KV400 KV
66 KV2.4 Meter3 Meter4.5 Meter5.4 Meter
132 KV3 Meter3 Meter4.5 Meter5.4 Meter
220 KV4.5 Meter4.5 Meter4.5 Meter5.4 Meter
400 KV4.5 Meter5.4 Meter5.4 Meter5.4 Meter

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Permissible Min ground Clearance of Electrical Line

KVGround ClearanceOver National Highway
66 KV6.1 Meter8.0 Meter
132 KV6.1 Meter8.6 Meter
220 KV7.0 Meter9.8 Meter
400KV8.8 Meter10.8 Meter

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Clearance for Telephone line Crossings Power Line

KVClearance (Min)
66 KV2.4 Meter
132 KV2.7 Meter
220 KV3.0 Meter

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Vertical Clearance between Electrical Line and railway tracks

KVClearance (Min)
66 KV14 Meter
132 KV14.6 Meter
220 KV15.4 Meter
400 KV17.9 Meter

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Clearance from Buildings to low, medium and high voltage lines

VoltageDescriptionDistance
Low & Medium VoltageFlat roof, open balcony, verandah roof ,When the line passes above the building a vertical clearance from the highest point2.5 Meter
Low & Medium VoltageLine passes adjacent to the building a horizontal clearance from the nearest point1.2 Meter
Low & Medium VoltageLine passes above the building a vertical clearance2.5 Meter
Low & Medium VoltageLine passes adjacent the building a Horizontal clearance1.2 Meter
11 KV to 33 KVLine passes above or adjacent   to any building or part of a building3.7  Meter
Above 33 KVLine passes above or adjacent   to any building or part of a building3.7+(0.3 for every additional 33 KV )
Up to 11 KVThe horizontal clearance between the nearer conductor and any part of such building1.2 Meter
11 KV to 33 KVThe horizontal clearance between the nearer conductor and any part of such building2.0 Meter
Above 33 KVThe horizontal clearance between the nearer conductor and any part ofsuch building2.0 + (0.3 for every additional 33 KV )

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Clearance above ground at the lowest conductor

VoltageDescriptionDistance
Low & Medium VoltageAcross a street5.8 Meter
High VoltageAcross a street6.1 Meter
Low & Medium VoltageAlong a street5.5 Meter
High VoltageAlong a street5.8 Meter
Low & Medium VoltageElsewhere than along or across any street4.0 Meter
High VoltageElsewhere than along or across any street5.2 Meter
33 KV & EHVClearance above ground(Add 0.3 Meter for every 33 KV Volts in 5.2 Meter)Min 6.1 Meter

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Vertical Clearance at Middle of Span

SpanVertical Clearance (At Middle of Span)
200 Meter4.0 Meter
300 Meter5.5 Meter
400 Meter7.0 Meter
500 Meter8.5 Meter

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Safety Clearance from Live Part in Outdoor Substation

KVSafety Working Clearance
12 KV2.6 Meter
36 KV2.8 Meter
72.5 KV3.1 Meter
145 KV3.7 Meter
220 KV4.3 Meter
400KV6.4 Meter
800 KV10.3 Meter

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Lying of Telecommunication Cables with Power Cables (>33 kV)

CableMin. Distance
Power cable of voltage exceeding 33 kV shall be laidMin 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

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Safe approach limits for people

Voltage214V to 415 KV11KV33KV66KV132KV275KV
Person using manually operated tool1.3 Meter2.0 Meter3.0 Meter4.0 Meter5.0 Meter6.0 Meter
Person using power operated tool3.0 Meter3.0 Meter3.0 Meter4.0 Meter5.0 Meter6.0 Meter

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Jignesh Parmar

Jignesh Parmar has completed M.Tech (Power System Control), B.E (Electrical). He is member of Institution of Engineers (MIE), India. He has more than 20 years experience in transmission & distribution-energy theft detection and maintenance electrical projects.

68 Comments


  1. kaustubh kocchar
    Jul 26, 2023

    i have my own land & i had applied for Environment clearance for mining in my land. 1 tower of 220 comes in my land. so what are the norms for tower line in my land. please guide me that from tower how much meter land i will not able to do mining activity. also provide me your copy of norms of your deparment.
    thanks.


  2. vivek
    Dec 21, 2022

    Fronm where did you took National Highway clearance ? please mention any Act/ Rule No. / The then CEA Guidelines? please revert back on e mail or phone no 08554994939


  3. Manoj Kumar Pathak
    Mar 14, 2021

    What minimum clearances (outer distance) should be maintained in an indoor substation having 11 KV HT and 415 V LT panels as per indian electricity rules/ CEA in following cases :

    (i) Between HT panel and LT panel


  4. vikal
    Nov 11, 2020

    planning to buy a house but it is only 5 m away from 33kV line, is it safe???


  5. gaurav kumar
    Oct 26, 2020

    Hello sir,
    132 kV line perposal over my land.i want to know what is the line clearance from house to line distance.
    Also we have not get any notice for to this.and tower plenth in my land so can we stop tower plenth work from my land.

    Can you breif me asap.


  6. Akar Hangong
    Jun 11, 2020

    sir i would like to know what should be the minimum distance between 11 KV XLPE UG cable and LT UG cable.


  7. Vinod Kumar
    Sep 18, 2019

    Dear Sir

    We are planing to design a incomer of 415V MCC which is fed from 415V PCC having 1.1Km Distance. The Power to be fed by LV 3.5 Core cable. Kindly tell us the basis of selection and design.

    Regards

    Vinod Kumar


  8. Gangadhar vyavahare
    Aug 25, 2019

    सर मेरे घर के 30 feet distance से 765kv ki line गई है मै वहा रह सकता हू के नही एक दीन अचानक मेरे घर के सामने वाली low tension line pe वो high tension का suply आ रहा था aur आग भी गिर रही थी मेरे घर के दीवार मे भी current आ राही थी मै क्या करु मेरी दुसरा घर बनाने की परीस्थिती नही है मेरा परीवार डर गया है मुझे आपसे फोन पर बात करनी है


  9. Simanta sarmah
    Aug 07, 2019

    Dear sir.
    I would like to know about the safety procedure of 11kv line, here in front our fully residential area.11kv line 10 feet away from ftom my house.so please suggest me what procedure to sfit away this 11kv supply line from our area.below 11kv line there also use 440 & 220 line.request to give a solution..


  10. Rahul
    Jun 30, 2019

    Dear Sir
    I would like to know about the safety distance between 132 Kv overhead line and Insulated 33kv overhead line if passing down through 132 Kv line…

    and also let me know how to find out the safety distance between two line, there is any basic design criteria if any..

    Regards
    Rahul


  11. Eldhose Mani
    Jun 14, 2019

    What is the voltage limit in Indai for the below:
    Low voltage LT-
    Medium voltage MV-
    High voltage HT:
    Extra high voltage EHT;


    • ads
      Jun 15, 2019

      Low voltage LT- 250V
      Medium voltage MV-650V
      High voltage HT:-33KV
      Extra high voltage EHT;above 33KV


  12. Neeraj
    May 08, 2019

    What minimum clearances (outer distance) should be maintained in an indoor substation having 11 KV HT and 415 V LT panels as per indian electricity rules/ CEA in following cases :

    (i) Between HT panel and LT panel
    (ii) Between HT panel and wall
    (iii) Between LT panel and wall
    (iv) Between two LT panels/ battery charger


  13. RAJ NARAYAN REJ
    Apr 26, 2019

    can I run 11kv xlpe armoured AL cable through basement adjacent to ceiling in a high rise appartments


  14. peter dong
    Apr 10, 2019

    Dear Mr Jignesh Parmar, could you advise the safety distance for cranes working close to 400kv overhead transmission line?


  15. Raman
    Apr 01, 2019

    Desr Sir,

    I want to know from were you have taken Permissible Min ground Clearance of Electrical Line vertically along NHAI road crossings. If there is any circular regarding it u can share it please.

    Thanks


  16. raman
    Apr 01, 2019

    Dear Sir,

    I want to know about permissible Min ground Clearance of Electrical Line from which reference it has been taken.


  17. Pankaj Latey
    Mar 19, 2019

    When a 220kV line is to be constructed parallel to existing 400kV DC line. what the clearance we have to maintain?


  18. Dhiren
    Jan 01, 2019

    i have a plot near 132 KV line.You have mentioned safe approach limit for people as 5m.Please confirm this is under which clause of IE rules. i presume it means that aperson living in the plot has to maintain a minimum distance of 5m for all practical purposes. Pl clarify is it the horizontal distance from last line after considering deflection etc. What is max deflection possible. Safe distances are to be considered for building are after taking into view the max wind speed deflection.An early reply will be really beneficial. Thx.


  19. Amine
    Oct 21, 2018

    Please i need your advice what is the clearance between the LV cables and Mechanical services when they are crossing
    example; As per the regulation the LV depth is 600mm and and for irrigation pipe is 400mm, the consultant his requist to provide duct and clearance 200mm is it ok
    please i need to follow the requirement of KM and if there’s in QCS or NFPA


  20. Pammi srinivas
    Oct 14, 2018

    R/sir,
    Please tell me One HV 220kv line passing through our plant we need a construction of shed near tower , 1.how much distance has to maintain?
    2.magnetic waves coming in poles what to do?
    3. Is it safe to construct?
    4. what major precaution has to take?


    • Highest power electric line crossing from my plot. Purchased after laying of line what to do
      Apr 25, 2019

      I have purchased a piece of land near the highest power electric line passing and I want to built a hotel therein. What are the rules


  21. Kusum chauhan
    Sep 26, 2018

    Dear sir plz tell me what is the clearance between phase to phase in 33 kV HT panel


  22. Sagar majhi
    Aug 28, 2018

    Surveyor


  23. kapil bhatt
    Aug 18, 2018

    Mr. Parmar,
    could you please tell me the minimum right of way requirements of 400kv underground double circuit line. if it is 48m for double circuit overhead line as per your article, what will it be for UG double circuit line.
    is the overhead to underground conversion possible /advisable in case of 400kV system?

    thanks
    Kapil Bhatt


  24. Dr P M Joseph
    Jul 31, 2018

    Sir,
    A 110 KV line is passing over my plot.I want to construct a shed of 3 m height from the ground under the line .Is it allowed?


  25. SUNDARAM
    May 23, 2018

    Dear sir,

    WE WILL ERCTION FOR TOWER CRANE .NEAR OHL 132 COING ON HOW MUCH DITANCE REQUIRED.


  26. Yogesh Gaonkar
    Apr 30, 2018

    Sir,
    On how much closer to 11kv over head line a man can get shock if u go close to it.


    • Jayant bhanpuriya
      Oct 29, 2018

      R/Sir
      Here in front of my home passing 11kv line,4-5 feet away from front of building, so please suggest me what procedure to sift away this agricultural 11kv supply line from our residential society.please give reply sir.


    • chandan kumar
      Dec 30, 2018

      no


  27. swati
    Apr 12, 2018

    Sir,

    our industry is that of Petroleum industry. in front of the main gate, there is a live 33 kv HT line going overhead which poses a risk to the petroleum product carrying vehicles standing in parking. can you pease suggest specifications required for cabling of that line to minimise the risk


  28. Sai Prasad
    May 18, 2017

    Dear Sir,

    I would like to learnt from you regarding the ground clearance required on National Highways with Heavy loads passing in the route having a132KV line crossing over the road, may you please specficy me the clearance required and code related to it.

    Thanks and looking forward to reading from you.


  29. Sampurna
    Feb 15, 2017

    Sir, please tell me what are the different types of service supports and permissible span as per the IE rule


  30. Shivkanth Vijayan
    Feb 07, 2017

    Hi Sir,

    I have been reading and following this website for past 8 yrs and its been a saviour always. Kindly tell me the standard in IE which define the space clearance between a 33/0.433KV 100KV Aux transformer tot he building in a switching substation. Kindly revert. Awaiting for your response.

    Regards,

    Shivkanth Vijayan


  31. Henri
    Dec 13, 2016

    How come we dont se any answers to questions above? Why should I bother asking one ?


  32. Nancy
    Aug 25, 2016

    Respected sir
    What is the clearance strategy for 400 KV high tension lines? What is the clearance for Explosives storage from High tension wire?


  33. morteza
    Aug 08, 2016

    Dear sir
    In Two circuit 20kv lines how much is the Clearance Between two lines in different lines in one Foundation?


  34. t ganesan
    May 03, 2016

    whether v can lay both ht and lt cable in a single cable trench ( RCC)


  35. priyanka munagle
    Feb 25, 2016

    hello sir,

    i have one question about the clearance between the 132/33KV substation to nearest petrol pump?

    plz help me.


  36. Kishore Rathod
    Feb 25, 2016

    Dear Sir,
    What max. distance we should maintain from 11 KV Sub-Station ( Customer) point of supply to VCB and Transformer as per Electricity rule? Please give us Rule No. also.


  37. Srinivas
    Jan 23, 2016

    Sir, we are proposing to lay 20 pair armoured telephone cable along with 11kv HT UG cable in under ground at a depth of 1meter. Can we lay both in the same trench and if, what is the distance between them to be leave and what is the standards to be followed.


  38. prabhakar naik
    Oct 28, 2015

    what should be the min distance between Phase to Phase and Phase to Earth for 11KV and 33KV system , while manufacturing of HT Panels.


  39. murali
    Oct 11, 2015

    Dear Sir,

    Please send the DOs& DONTs at 33KV maintenance list to display in our factory.

    Thanks&Regards,
    Murali Tadi


  40. abdul hafeez
    Sep 23, 2015

    exploring the knowledge about electrical power


  41. D.R.M.RAO
    Aug 31, 2015

    Dear sir,

    one 66 k.v line passing through company premises please advice what is the clearance between conductor and building and if under ground cable what is the digging depth and clearance


    • Rohit
      Jan 01, 2016

      Want to know the safe distance for construction of wall from underground cable of 33KVA passing adjascent to my plot.
      Thans and regards
      Rohit


      • nirpal singh dhaliwal
        Sep 28, 2016

        looking fore safety standards for buildings from a 66kv line…


  42. Abhishek Kumar
    Aug 15, 2015

    HI Sir,

    I would like to know that,
    1) What is the range of several voltage like Low Voltage- From ….? to ….., High Volatge From……to….EHV from….to…..UHV from ….to…….i have searched this multiple time on internate but didn’t got stisfactory answer as ans is not same everywhere.
    2)On what reference we segregate them.
    3)What is LT, and HT, if LT for Low voltage and HT for High Voltage then EHT and UHT must exist.


  43. ram pratap suthar
    Jul 09, 2015

    Sir, i would like to ask what the safety rule/measures for common peoples for HT(11000 Kv) lines cross the main street of any village/ town, what the responsibility of electricity board to protect peoples if the power wire broken and comedown what should to do electricity board in that condition kindly explain


  44. K.R.RaghavaRao M/S Brindavan electricals
    May 26, 2015

    What should be the minimum vertical clearance from 132 K.V transmission line to 15 K.V.A / 40.K.V.A.415 volts, 50Hz. Diesel generator set.


  45. Behnam
    Apr 21, 2015

    Dear Sir,
    The 132 KV power line are above the road.
    could you please tell me about the danger zone for movement of vehicles and cranes
    under the power lines .


  46. Behnam
    Apr 21, 2015

    Hi dear Jignesh Parmar
    I have question from you.
    we have a power network(132 kv) cross the road in our company. what is the Safe distance
    between Power network cables(132 kv) and top of the vehicles for example crane’s boom?
    so i want to know how much vertical meter should we consider from cables to ground?
    also what is the standards?


  47. Prasant
    Mar 31, 2015

    Hello Sir,
    I have a plot near 132 KV line.
    The 132 KV line is (40 foot/13 meter) away from my plot .
    Can you Please clarify Safe distances(distance from 132 KV to my plot & as well as the hight of building) are to be considered for building are after taking into view the max wind speed deflection.An early reply will be really beneficial.
    Your support/suggestions are highly appreciated and welcome


    • Behnam
      Apr 21, 2015

      Hi sir,
      The 132 KV line is up the road and i just meant about going the vehicles under the 132 KV line. so i want to know the safe distance from 132 KV line. not about buildings because we there is no any buildings under the network.
      best regards


  48. shrikant saroj
    Mar 18, 2015

    calculation for minimum clearance on existing non electrifed routes from rail level for above 11KV & UPTO 33 KV is given 10860mm


  49. Sachin Mhatre
    Jan 30, 2015

    We have 100kv line in switchyard substation. We now procuring new isolator for it having min voltage – 132kv & Max voltage – 145kv. What should be clearance from ground of live conductor?
    In IE rule it mentioned 6.1 mtr for OH lines crossing road, Is it same for switchyard installation?

    waiting for your reply


  50. dushyant
    Sep 10, 2014

    A 11Kv line is passing alongside of our access way.
    Now, this access passage has got filled with slushy soil,water slippery due to rainfall.
    It has got continous men , material movement thru trucks, transit millers,jcb, hydra.
    It is near about 500mtrs sterch having width 3mtrs apprx.
    Is it safe for use??
    earliest reply would be most beneficial.


  51. Abdulsathar
    Aug 20, 2014

    Sir, a new transmission line of 400kv is passing over my home….it is not commissioned now….is there any possibility of interruptions with my mobile phones,television and other electronic gadgets..when the line is commissioned?


  52. Gaurav Saxena
    Jul 16, 2014

    Dear Sir,
    we are building a new campus of IIT Indore. There is over head line of 132 KV crossing the approach road, whose sag has increased due to which the distance between ground and transmission line had decreased. Kindly, suggest the protective measures.
    Your endeavor in this regard will be highly appreciated
    Thanking You,
    Gaurav Saxena.
    JE Electrical
    IIT Indore


  53. rakesh
    Jul 15, 2014

    i have a plot near 132 KV line.You have mentioned safe approach limit for people as 5m.Please confirm this is under which clause of IE rules. i presume it means that aperson living in the plot has to maintain a minimum distance of 5m for all practical purposes. Pl clarify is it the horizontal distance from last line after considering deflection etc. What is max deflection possible. Safe distances are to be considered for building are after taking into view the max wind speed deflection.An early reply will be really beneficial. Thx.


    • rakesh
      Jul 16, 2014

      I am an electrical engineer.Please clarify the source regarding figures distances of safe approach for people. I request Mr. jigu Parmar to send me the reply at my email address or give his phone no. so that i can discuss with him.Thx


  54. R. Godara
    May 19, 2014

    Sir
    Can you let me know the standards for clearances for 132 KV underground sub stations.


  55. arnab chakraborty
    Mar 25, 2014

    i wnt indian electricity rule
    pls help me


  56. muneer
    Jan 29, 2014

    Thanq

    Your information was very useful to me..
    I will be glad to you,If you send your contact no on my email id for further clarification of doubts.

    Thanks & Regards
    Muneer


    • AAY
      Aug 18, 2014

      Dear Sir,

      I just purchased a land where i am now building a two story bedrooms for residential, but i just find out that there is a 220 kv electrical line passingabove my parcel. Can you please advise more on safety distance to be maintained for my little family that i cherish, i will put plastic roof for isolation but i need a better advise from you.
      please respond on my email.
      Thanks and looking forward to reading from you.


      • SRINIVAS NRML
        Sep 21, 2016

        Dear Sir
        Please tell me I am living beside at apartment (20 Flats ) and also Transformer near to my house , Can You please tell me Magnetic waves are harm to us, and How much safe distance between transformer and building Wall and tree and Set back for all sides as per Indian Electricity Latest Rules


        • Bhagbat Kisku
          Sep 16, 2020

          Sir,
          In safety point of view, what minimum distance will be maintained between the residential house and electric transformer as per the rules.


  57. m.j.taghizadeh
    Feb 25, 2013

    Thank you for this and other parts.

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