Beef Gap Corridor Underground Transmission Row
Electrical Safety Clearance-(IE/CEA) (Part-2)
Code: Indian Electricity Rules/ Central Electricity Authority :
Right of Way Clearance (As per GETCO Standard):
| KV | Min ROW |
| 66 KV | 18 Meter |
| 132 KV | 27 Meter |
| 220 KV | 35 Meter |
| 400KV | 52 Meter (Single Circuit) |
| 400 KV | 48 Meter (Double Circuit) |
Minimum clearances between Electrical Lines crossing each other:
| Voltage | 66 KV | 132 KV | 220 KV | 400 KV |
| 66 KV | 2.4 Meter | 3 Meter | 4.5 Meter | 5.4 Meter |
| 132 KV | 3 Meter | 3 Meter | 4.5 Meter | 5.4 Meter |
| 220 KV | 4.5 Meter | 4.5 Meter | 4.5 Meter | 5.4 Meter |
| 400 KV | 4.5 Meter | 5.4 Meter | 5.4 Meter | 5.4 Meter |
Permissible Min ground Clearance of Electrical Line:
| KV | Ground Clearance | Over National Highway |
| 66 KV | 6.1 Meter | 8.0 Meter |
| 132 KV | 6.1 Meter | 8.6 Meter |
| 220 KV | 7.0 Meter | 9.8 Meter |
| 400KV | 8.8 Meter | 10.8 Meter |
Clearance for Telephone line Crossings Power Line:
| KV | Clearance (Min) |
| 66 KV | 2.4 Meter |
| 132 KV | 2.7 Meter |
| 220 KV | 3.0 Meter |
Vertical Clearance between Electrical Line and railway tracks.
| KV | Clearance (Min) |
| 66 KV | 14 Meter |
| 132 KV | 14.6 Meter |
| 220 KV | 15.4 Meter |
| 400 KV | 17.9 Meter |
Clearance from Buildings to low, medium & high voltage lines:
| Voltage | Description | Distance |
| Low & Medium Voltage | Flat roof, open balcony, verandah roof ,When the line passes above the building a vertical clearance from the highest point | 2.5 Meter |
| Low & Medium Voltage | Line passes adjacent to the building a horizontal clearance from the nearest point | 1.2 Meter |
| Low & Medium Voltage | Line passes above the building a vertical clearance | 2.5 Meter |
| Low & Medium Voltage | Line passes adjacent the building a Horizontal clearance | 1.2 Meter |
| 11 KV to 33 KV | Line passes above or adjacent to any building or part of a building | 3.7 Meter |
| Above 33 KV | Line passes above or adjacent to any building or part of a building | 3.7+(0.3 for every additional 33 KV ) |
| Up to 11 KV | The horizontal clearance between the nearer conductor and any part of such building | 1.2 Meter |
| 11 KV to 33 KV | The horizontal clearance between the nearer conductor and any part of such building | 2.0 Meter |
| Above 33 KV | The horizontal clearance between the nearer conductor and any part of such building | 2.0 + (0.3 for every additional 33 KV ) |
Clearance above ground at the lowest conductor:
| Voltage | Description | Distance |
| Low & Medium Voltage | Across a street | 5.8 Meter |
| High Voltage | Across a street | 6.1 Meter |
| Low & Medium Voltage | Along a street | 5.5 Meter |
| High Voltage | Along a street | 5.8 Meter |
| Low & Medium Voltage | Elsewhere than along or across any street | 4.0 Meter |
| High Voltage | Elsewhere than along or across any street | 5.2 Meter |
| 33 KV & EHV | Clearance above ground (Add 0.3 Meter for every 33 KV Volts in 5.2 Meter) | Min 6.1 Meter |
Vertical Clearance at Middle of Span:
| Span | Vertical Clearance (At Middle of Span) |
| 200 Meter | 4.0 Meter |
| 300 Meter | 5.5 Meter |
| 400 Meter | 7.0 Meter |
| 500 Meter | 8.5 Meter |
Safety Clearance from Live Part in Outdoor Substation:
| KV | Safety Working Clearance |
| 12 KV | 2.6 Meter |
| 36 KV | 2.8 Meter |
| 72.5 KV | 3.1 Meter |
| 145 KV | 3.7 Meter |
| 220 KV | 4.3 Meter |
| 400KV | 6.4 Meter |
| 800 KV | 10.3 Meter |
Lying of Telecommunication Cables with Power Cables (>33 kV).
| Cable | Min. Distance |
| Power cable of voltage exceeding 33 kV shall be laid | Min 1.2 Meter depth |
| Underground telecommunication cable shall be with underground power cable of voltage exceeding 33 kV. | Min 0.6 Meter Separate from Power Cable |
Safe approach limits for people :
| Voltage | 214V to 415 KV | 11KV | 33KV | 66KV | 132KV | 275KV |
| Person using manually operated tool | 1.3 Meter | 2.0 Meter | 3.0 Meter | 4.0 Meter | 5.0 Meter | 6.0 Meter |
| Person using power operated tool | 3.0 Meter | 3.0 Meter | 3.0 Meter | 4.0 Meter | 5.0 Meter | 6.0 Meter |
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in "Electrical Mirror", "Electrical India", "Lighting India","Smart Energy", "Industrial Electrix"(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. 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.
Source: https://electricalnotes.wordpress.com/2012/08/09/electrical-safety-clearance-part-2/
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