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Home / Technical Articles / Electrical Safety Standards for LV/MV/HV (Part-1)
Electrical Safety Standards for LV/MV/HV (Part-1)
Electrical Safety Standards for LV/MV/HV (on photo Indonesia's state energy giant - High Voltage Switchyard)

Content

  1. Standard: Western Power Company
  2. Standard: New Zealand Electrical Code
  3. Standard: ETSA Utilities
  4. Standard: UK Power Networks – EI 02-0019

1. Standard: Western Power Company

Water Safely Clearance on Electrical Fires

Voltage Minimum distances between a nozzle producing a fog stream of fresh water and a live conductor
Up to 750 V 1.5 Meter
750 V to 15 KV 4.0  Meter
15 KV to 230 KV 5.0 Meter

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Minimum Approach Distance for Authorized Person

This is the minimum distance that must be maintained by a person, vehicle or mobile plant.

Voltage Distance (minimum)
Up to 1 KV 0.7 Meter
1 V to 6.6 KV 0.7 Meter
6.6 KV to 11 KV 0.7 Meter
11 KV to 22 KV 0.7 Meter
22 KV to 33 KV 1.0 Meter
33 KV to 66 KV 1.0 Meter
66 KV to 132 KV 1.2 Meter
132 KV to 220 KV 1.8 Meter
220 KV to 330 KV 3.0 Meter

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Minimum Approach Distance for Ordinary Person

Voltage Distance  (min)
Up to 1 KV 3.0 Meter
1 V to 6.6 KV 3.0 Meter
6.6 KV to 11 KV 3.0 Meter
11 KV to 22 KV 3.0 Meter
22 KV to 33 KV 3.0 Meter
33 KV to 66 KV 3.0 Meter
66 KV to 132 KV 3.0 Meter
132 KV to 220 KV 4.5 Meter
220 KV to 330 KV 6.0 Meter

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Minimum Approach Distance for Vehicle and Plant for Ordinary Person

Voltage Distance  (min)
Mobile Plant Vehicle
Up to 1 KV 3.0 Meter 0.6 Meter
1 V to 6.6 KV 3.0 Meter 0.9 Meter
6.6 KV to 11 KV 3.0 Meter 0.9 Meter
11 KV to 22 KV 3.0 Meter 0.9 Meter
22 KV to 33 KV 3.0 Meter 0.9 Meter
33 KV to 66 KV 3.0 Meter 2.1 Meter
66 KV to 132 KV 3.0 Meter 2.1 Meter
132 KV to 220 KV 3.0 Meter 2.9 Meter
220 KV to 330 KV 6.0 Meter 3.4 Meter

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2. Standard: New Zealand Electrical Code

Min. Safe Distance between Buildings and Overhead Line

Voltage Pole Tower
11 kV to 33 kV 2 Meter 2 Meter
33 kV to 66 kV 6 Meter 6 Meter
66 kV and Above 8 Meter 8 Meter

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Min. Safe Distance for excavation near Overhead Line

Description of Clearance From Pole (Min) From Tower (min)
Excavation in land more than 750mm depth 8 Meter 12 Meter
Excavation in land up to750mm depth 2.2 to 5 Meter 6 to12 Meter
Excavation in land up to 300mm depth 2.2 Meter 6 Meter
Construction near 11KV to 33KV Line 2.2 Meter 6 Meter
Construction near 33KV to 66KV Line 6 Meter 9  Meter
Construction near 66KV and more 8 Meter 12 Meter
Wire Fence near 1KV to 66KV Line 2.2 Meter 2.2 Meter
Wire Fence near 66KV and more 5 Meter 5 Meter

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Min. Safe Distance for Tower Carin near Electrical Tower

Description of Clearance Distance (Min)
Mobile Carin movement 4.0 Meter
Tower Carin movement 4.0 Meter
Carin movement 4.0 Meter
Moving Activity above height of Tower 4.0 Meter
Hedge Cutter  movement 4.0 Meter

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Min. Safe Vertical Distance above Railway Track

Description of Clearance Distance (Min)
Earthed conductors 5.5 Meter
Stay wires 5.5 Meter
Conductors up to 33 kV 6.5 Meter
Conductors above 33 kV to 220 kV 7.5 Meter
Conductors above 220 kV. 8 Meter

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Min. Distance between two Conductors on Same Supports

High Voltage Circuit High Voltage Circuit Distance  between circuits (min)
Up to 33 KV Up to 1KV 1.0 Meter
Up to 33 KV More than 1KV 1.2 Meter
33 KV to 110 KV Up to 1KV 1.5 Meter
33 KV to 110 KV More than 1KV 2.0 Meter
More than 110 KV All 2.5 Meter

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Min. Distance between two Conductors on Different Supports

High Voltage Circuit Distance (min)
Up to 1 KV 0.6 Meter
1 KV to 33 KV 1.2 Meter
33 KV to 66 KV 1.8 Meter
110 KV 2.4 Meter
More than 220 KV 2.8 Meter

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Min. Safety Distance from Electrical Apparatuses

Description of Clearance Distance (min)
Passage In front of Metal-Clad Switchgear (UP to HV) 1.0 Meter wide 2.5 Height
Passage In rear or side of Metal-Clad Switchgear (UP to HV) 1.0 Meter wide 2.2 Height
Passage at any side of Metal-Clad Switch gear containing Bare conductor (UP to HV) 0.8 Meter wide 2.2 Height

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Min. Approach Distance for Non-Competent Person near exposed Live Parts

Voltage Distance (min)
Below 110 kV 4.0 Meter
220 kV and above 6.0 Meter

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Min. Approach Distance for Competent Person near exposed Live Parts

Voltage Distance (min)
Below 1 kV 0.5 Meter
11 kV 1.5 Meter
22 kV 2.0 Meter
33 kV 2.5 Meter
66 kV 3.0 Meter
110 kV 4.0 Meter
220 kV and above 6.0 Meter

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3. Standard: ETSA Utilities

Vertical Clearances between Services

Service LV Cable HV Cable
Common Pipe 0.100 Meter 0.100 Meter
Gas Pipe 0.200 Meter 0.200 Meter
Sewer Pipe 0.300 Meter 0.300 Meter
Water Pipe 0.600 Meter 0.600 Meter

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Horizontal Clearances between Services

Service LV Cable HV Cable
Common Pipe 0.100 Meter 0.100 Meter
Gas Pipe 0.200 Meter 0.200 Meter
Sewer Pipe 1.0 Meter 1.0 Meter
Water Pipe 0.600 Meter 0.600 Meter

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4. Standard: UK Power Networks – EI 02-0019

Cable Installation Depths

Voltage Area Depth (min)
Low Voltage Footways, grass verges or private property 0.450 Meter
Carriageways (including road crossings) 0.600 Meter
Normal agricultural land (not deep ploughing) 1.0 Meter
Agricultural land subject to deep ploughing 1.2 Meter
11 KV to 20 KV Footways, grass verges or private property 0.600 Meter
Carriageways (including road crossings) 0.750 Meter
Normal agricultural land (not deep ploughing) 1.0 Meter
Agricultural land subject to deep ploughing 1.2 Meter
33 KV to 132 KV Footways, grass verges or private property 0.9 Meter
Carriageways (including road crossings) 0.9 Meter
Normal agricultural land (not deep ploughing) 1.0 Meter
Agricultural land subject to deep ploughing 1.2 Meter
Auxiliary Multi-core & Multi-pair Cables Footways, grass verges or private property 0.450 Meter
Carriageways (including road crossings) 0.600 Meter
Normal agricultural land (not deep ploughing) 1.0 Meter
Agricultural land subject to deep ploughing 1.2 Meter
On Cable Ladder for LV to HV The Horizontal clearance between cables on cable ladders 2X Dia of Cable of Largest Cable or min 150 mm
The clearance from a supporting wall 20 mm
The vertical clearance between cables is greater 150 mm
If the number of cables > 4, they are to be installed in a horizontal

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Minimum Approach Distance of Crane or Moving Part from Live Conductor

Voltage Without Safety Observation For ordinary Person
Un insulated portions Insulated portions
Up to 1KV 2 Meter 1.0 Meter 3.0 Meter
11 KV 2 Meter 1.4 Meter 3.0 Meter
22 KV 2.4 Meter 2 Meter 3.0 Meter
33 KV 2.4 Meter 2 Meter 3.0 Meter
66 KV 2.8 Meter 2 Meter 3.0 Meter
132 KV 3.0 Meter 3.0 Meter 3.0 Meter
220 KV 4.8 Meter 4.8 Meter 6.0 Meter
330 KV 6.0 Meter 6.0 Meter 6.0 Meter
500 KV 8.0 Meter 8.0 Meter 8.0 Meter

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Minimum Fixed Clearances for Electrical Apparatus (Isolation Points)

Voltage Fixed Clearance
Up to 11Kv 0.320 Meter
11KV to 33KV 0.320 Meter
33KV to 66KV 0.630 Meter
66KV to 132KV 1.1 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.

17 Comments


  1. Saeed
    Jul 09, 2019

    Need to know minimum approach distance to a MV transformer(11kv,22kv) for ordinary persons,and can a technition touch the transformer body safely.


  2. Saad
    Mar 26, 2019

    Greeting…
    i am not sure you will advise my enquiry as I saw you not answer any comments .
    could you please advise that if there are any article in BS standard mention for the clearance between MV,LV & other utilities as mention here in this informative article.

    appreciation your helpful


  3. Rajib
    Dec 31, 2018

    I am looking for a flat. 66Kv line is just 5 miters away from balcony. is it safe?


    • pawan kumar sharma
      Apr 14, 2019

      no it is not safe ,minimum distanse shoud be 8 meter


  4. Hayder
    Aug 18, 2018

    It is a great article.

    Would you please refer to the standard that you got this information from, in order to be more specific when I negotiate with others.


  5. ali
    Aug 06, 2018

    what is the distance between underground HV(11kv) and LV(415 v) cable


  6. ABDUL MOHID SHEIKH
    Apr 25, 2018

    What should be the phase to phase and circuit to circuit distance between 380kV XLPE directly buried 1C cable in flat formation?


  7. Eng. Mostafa Elsheikh
    Feb 21, 2018

    Pls, What is the distance of 66 KV – O.H.T.L from tower to another ? Thanks


  8. Geetesh
    Jan 08, 2016

    Excellent article.

    Thanks
    Are there any regulations in India governing safe distance for construction activities ? How are they governed.


  9. Maureen Pumulo
    Nov 13, 2015

    Good Day,
    may send us a quote for tester live line 220/330kv as soon as possible.
    And for how long can it take for us to get it?

    My Regards
    Ms pumulo
    +260966497718


  10. rajkumar panwar
    Jun 06, 2015

    Safe distance between phase to phase &phase to earth& other arrival is best arrival. thank you.


  11. P.Shreehari
    Mar 30, 2015

    In a 33 KV feeder line , at what distance isolation needs to be provided


  12. nisar ahmed
    Mar 12, 2015

    What will be the permissible distance between high voltage tower and stone quarry and crushing unit please also suggest the related laws and information thanking you


  13. Gita
    Feb 15, 2015

    Hello Mr. Parmar,

    Very informative article. What is the safe distance between a High Voltage Power grid tower and a crushing unit as per law? It will be helpful if you can point me to any related Act or article for more information.


    • Gita
      Feb 15, 2015

      By crushing unit I meant a stone quarry


  14. sanilal
    Aug 29, 2014

    Respected sir,

    i would like to know easy way to trouble shoot a series aeronautical ground lighting circuit


  15. Gamili
    Aug 26, 2014

    I am looking for the safe distance between a person sitting 8 hours per day next to a medium voltage cable 10 kv

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