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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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About Author //

author-pic

Jignesh Parmar

jiguparmar - Jignesh Parmar has completed M.Tech (Power System Control) ,B.E(Electrical). He is member of Institution of Engineers (MIE),India. Membership No:M-1473586.He has more than 13 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in "Electrical Mirror", "Electrical India", "Lighting India", "Industrial Electrix"(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

32 Comments


  1. 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?


  2. 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?


  3. t ganesan
    May 03, 2016

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


  4. 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.


  5. 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.


  6. 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.


  7. 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.


  8. murali
    Oct 11, 2015

    Dear Sir,

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

    Thanks&Regards,
    Murali Tadi


  9. abdul hafeez
    Sep 23, 2015

    exploring the knowledge about electrical power


  10. 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…


  11. 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.


  12. 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


  13. 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.


  14. 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 .


  15. 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?


  16. 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


  17. 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


  18. 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


  19. 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.


  20. 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?


  21. 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


  22. 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


  23. R. Godara
    May 19, 2014

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


  24. arnab chakraborty
    Mar 25, 2014

    i wnt indian electricity rule
    pls help me


  25. 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


  26. m.j.taghizadeh
    Feb 25, 2013

    Thank you for this and other parts.

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