Electrical Safety Standards for LV/MV/HV (on photo Indonesia's state energy giant - High Voltage Switchyard)
Content
- Standard: Western Power Company
- Water Safely Clearance on Electrical Fires
- Minimum Approach Distance for Authorized Person
- Minimum Approach Distance for Ordinary Person
- Minimum Approach Distance for Vehicle and Plant for Ordinary Person
.
- Min. Safe Distance between Buildings and Overhead Line
- Min. Safe Distance for excavation near Overhead Line
- Min. Safe Distance for Tower Carin near Electrical Tower
- Min. Safe Vertical Distance above Railway Track
- Min. Distance between two Conductors on Same Supports
- Min. Distance between two Conductors on Different Supports
- Min. Safety Distance from Electrical Apparatuses
- Min. Approach Distance for Non-Competent Person near exposed Live Parts
- Min. Approach Distance for Competent Person near exposed Live Parts
.
- Cable Installation Depths
- Minimum Approach Distance of Crane or Moving Part from Live Conductor
- Minimum Fixed Clearances for Electrical Apparatus (Isolation Points)
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |