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

66 Comments


  1. 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


  2. vikal
    Nov 11, 2020

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


  3. 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.


  4. 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.


  5. 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


  6. 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


  7. 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..


  8. 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


  9. 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


  10. 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

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