Electrical Safety Clearance (Part-5)

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

 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 to300mm 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

 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

 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

 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

 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

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

 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

 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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About Jignesh.Parmar
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical) from Gujarat University. He has more than 14 years experience in Power Transmission-Power Distribution-Electrical energy theft detection-Electrical Maintenance-Electrical Projects(Planning-Designing-coordination-Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He is Freelancer Programmer of Advance Excel and design useful Excel Sheets of Electrical Engineering as per IS,NEC,IEC,IEEE codes. He is technical Author for "Electrical Mirror" and "Electrical India" Magazines. 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.

6 Responses to Electrical Safety Clearance (Part-5)

  1. vamsi says:

    is all these standards same for india?

  2. ram says:

    HI I would like to run a Over head 220 KV line from KSEB sub station. Can i run a single wire system . Or should i run a two wire only , what is the advantage and disadvantage .
    From the KSEB substation to my plant i need to apply for a new connection.

    • For Two Wire means “Bundle Conductor” Or “Double Circuit”
      It is required deeply Calculation.. It is not just design as we design or Calculate 415V or 11KV Line. I am just giving overview of the design and Calculation.

      (1) Need to study Capacity of S/S Transformer to carry Load & Is there any Exist Gantry to take 220KV Line from S/S.
      (2) Need to Calculate % Voltage Regulation of Proposed Line.
      (3) If Calculated % VD is not within limit than need to choose higher Capacity of conductor (form Site condition and Load You have to choose ACSR,AAR etc) or Use Bundle conductor.
      (4) Recalculate % VD and changing the Value of Distance,Conductor,No of Conductor and make it in within Value.

      Bundle Conductor have some Advantage also for that refer post of “Corona effect” of this Blog.
      I have just tried to calculate % Voltage Regulation of Line. Refer Post of “Electrical Tool” of this Blog.

      • sufham says:

        Hi Parmar,
        We are digging for 400VAC distribution trench power cable and we are running along the road between houses. Can you plz tell me how much clearance should we keep from building wall foundation? Thanks.

  3. nair says:

    11 kv overhead lines are passing through my land. now kseb is proposed to have one more 33 kv line above the same.let me know how much additional land i am loosing as per safety distance rule and let me know whether i am eligible for any compensation for this additional line

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