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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.

66 Comments


  1. RAJ NARAYAN REJ
    Apr 26, 2019

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


  2. peter dong
    Apr 10, 2019

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


  3. 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


  4. 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.


  5. 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?


  6. 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.


  7. 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


  8. 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


  9. Kusum chauhan
    Sep 26, 2018

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


  10. Sagar majhi
    Aug 28, 2018

    Surveyor


  11. 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


  12. 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?


  13. SUNDARAM
    May 23, 2018

    Dear sir,

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


  14. 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


  15. 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

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