Electrical Safety Clearance (New Zealand Electrical)(Part-5)
August 18, 2012 8 Comments
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 |
JIGNESH PARMAR
is all these standards same for india?
We can use as a reference which are not clearly specified in Indian Standard.
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.
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.
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
Kseb rules
How much distance need to keep from a HT line for mobile tower construction(KSEB)