Continued from part 2 – Electrical Safety Standards for LV/MV/HV (Part-2)
Content
Standard: Northern Ireland Electricity (NIE), 6/025 ENA
Code: Indian Electricity Rules / Central Electricity Authority
- Right of Way Clearance (As per GETCO Standard)
- Minimum clearances between Electrical Lines crossing each other
- Permissible Min ground Clearance of Electrical Line
- Clearance for Telephone line Crossings Power Line
- Vertical Clearance between Electrical Line and railway tracks
- Clearance from Buildings to low, medium & high voltage lines
- Clearance above ground at the lowest conductor
- Vertical Clearance at Middle of Span
- Safety Clearance from Live Part in Outdoor Substation
- Lying of Telecommunication Cables with Power Cables (>33 kV)
- Safe approach limits for people
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 and 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 ofsuch 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 |
Related electrical guides & articles
Fronm where did you took National Highway clearance ? please mention any Act/ Rule No. / The then CEA Guidelines? please revert back on e mail or phone no 08554994939
What minimum clearances (outer distance) should be maintained in an indoor substation having 11 KV HT and 415 V LT panels as per indian electricity rules/ CEA in following cases :
(i) Between HT panel and LT panel
planning to buy a house but it is only 5 m away from 33kV line, is it safe???
Hello sir,
132 kV line perposal over my land.i want to know what is the line clearance from house to line distance.
Also we have not get any notice for to this.and tower plenth in my land so can we stop tower plenth work from my land.
Can you breif me asap.
sir i would like to know what should be the minimum distance between 11 KV XLPE UG cable and LT UG cable.
Dear Sir
We are planing to design a incomer of 415V MCC which is fed from 415V PCC having 1.1Km Distance. The Power to be fed by LV 3.5 Core cable. Kindly tell us the basis of selection and design.
Regards
Vinod Kumar
सर मेरे घर के 30 feet distance से 765kv ki line गई है मै वहा रह सकता हू के नही एक दीन अचानक मेरे घर के सामने वाली low tension line pe वो high tension का suply आ रहा था aur आग भी गिर रही थी मेरे घर के दीवार मे भी current आ राही थी मै क्या करु मेरी दुसरा घर बनाने की परीस्थिती नही है मेरा परीवार डर गया है मुझे आपसे फोन पर बात करनी है
Dear sir.
I would like to know about the safety procedure of 11kv line, here in front our fully residential area.11kv line 10 feet away from ftom my house.so please suggest me what procedure to sfit away this 11kv supply line from our area.below 11kv line there also use 440 & 220 line.request to give a solution..
Dear Sir
I would like to know about the safety distance between 132 Kv overhead line and Insulated 33kv overhead line if passing down through 132 Kv line…
and also let me know how to find out the safety distance between two line, there is any basic design criteria if any..
Regards
Rahul
What is the voltage limit in Indai for the below:
Low voltage LT-
Medium voltage MV-
High voltage HT:
Extra high voltage EHT;
Low voltage LT- 250V
Medium voltage MV-650V
High voltage HT:-33KV
Extra high voltage EHT;above 33KV
What minimum clearances (outer distance) should be maintained in an indoor substation having 11 KV HT and 415 V LT panels as per indian electricity rules/ CEA in following cases :
(i) Between HT panel and LT panel
(ii) Between HT panel and wall
(iii) Between LT panel and wall
(iv) Between two LT panels/ battery charger