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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)

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)

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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

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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

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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

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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

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Clearance from Buildings to low, medium and 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 )

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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

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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

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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

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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

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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

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author-pic

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 13 years experience in transmission & distribution-energy theft detection and maintenance electrical projects.

57 Comments


  1. 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


  2. 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


  3. RAJ NARAYAN REJ
    Apr 26, 2019

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


  4. peter dong
    Apr 10, 2019

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


  5. 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


  6. 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.


  7. 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?


  8. 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.


  9. 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


  10. 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


  11. Kusum chauhan
    Sep 26, 2018

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


  12. Sagar majhi
    Aug 28, 2018

    Surveyor


  13. 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


  14. 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?


  15. SUNDARAM
    May 23, 2018

    Dear sir,

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


  16. 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


  17. 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


  18. 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.


  19. Sampurna
    Feb 15, 2017

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


  20. 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


  21. Henri
    Dec 13, 2016

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


  22. 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?


  23. 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?


  24. t ganesan
    May 03, 2016

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


  25. 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.


  26. 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.


  27. 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.


  28. 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.


  29. murali
    Oct 11, 2015

    Dear Sir,

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

    Thanks&Regards,
    Murali Tadi


  30. abdul hafeez
    Sep 23, 2015

    exploring the knowledge about electrical power


  31. 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…


  32. 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.


  33. 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


  34. 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.


  35. 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 .


  36. 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?


  37. 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


  38. 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


  39. 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


  40. 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.


  41. 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?


  42. 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


  43. 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


  44. R. Godara
    May 19, 2014

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


  45. arnab chakraborty
    Mar 25, 2014

    i wnt indian electricity rule
    pls help me


  46. 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


  47. m.j.taghizadeh
    Feb 25, 2013

    Thank you for this and other parts.

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