Electrical Safety Clearance (New Zealand Electrical)(Part-5)

 

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