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1.
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BUILDING:
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(a)
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Where a high or extra high voltage over head line passes
above or adjacent to any building or part of a building, it shall have on
the basis of maximum sag, a vertical clearance above the highest part of
the building immediately under such line, of not less than:
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(a) for high voltage line upto and including.
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33 KV
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3.685 mtrs. (12 ft.)
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(b) for extra high voltage lines
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3.685 mtrs. (12 ft.) plus
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0.305 mtrs. (1 ft.) for every additional 33 KV or part
there of
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(b)
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The horizontal clearance between the nearest conductor
and any part of such building shall on the basis of maximum deflection due
to wind pressure, be not less than:
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(a) for high voltage line upto and including 11 KV
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1.219 mtrs. (4 ft.)
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(b) for high voltage line above 11 KV and upto
and including 33 KV
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1.829 mtrs. (6 ft.)
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(c) For extra high voltage line
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1.829 mtrs. (6 ft.) plus
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0.305 mtrs. (1 ft;) for every additional 33 KV or part thereof.
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2.
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CLEARANCE ABOVE GROUNDS:
(Clause 77 of Indian Electricity Rules)
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m.m.
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33 KV
66 KV
132 KV
220 KV
400 KV
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5100
5490
6100
7015
8840
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3.
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CLEARANCE OVER RIVERS:
(Above maximum flood level)
Rivers not Navigable
Rivers Navigable
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3050 mm above HFL.
Suitable clearance in maximum water level condition, above the
tallest mast, in consultation with Navigational authotities concerned.
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4.
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CLEARANCE OVER PTCC LINE:
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m.m.
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66 KV
132 KV
220 KV
400 KV
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2440
2745
3050
4880
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5.
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MINIMUM CLEARANCE BETWEEN POWER LINES:
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Nominal System Voltage of line to be crossed:
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KV
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11
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33
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66
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132
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220
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400
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11
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2.44
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2.44
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2.44
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3.05
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4.58
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6.10
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33
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2.44
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2.44
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3.05
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4.58
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6.10
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66
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2.44
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3.05
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4.58
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6.10
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132
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3.05
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4.58
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6.10
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220
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4.58
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6.10
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400
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6.10
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Higher voltage line normally be kept over lower voltage
line.
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6.
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As per ISS 162-1961 minimum electrical clearance from
live part to earth and safety clearance in case of different voltage must
be kept as follows:
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VOLTAGE
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ELECTRICAL CLEARANCE (mm) Phase-Earth / Phase-Phase
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SAFETY CLEARANCE IN SIS (mm)
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KV
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33
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381
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432
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2740
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66
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658
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786
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3050
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132
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1127
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1473
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3810
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220
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2082
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2388
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4570
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4000
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3500
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4000
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6100
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7.
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CLEARANCE FROM RAILWAY TRACKS:
(As per Regulation for Electrical Crossing of Railway Tracks 1963)
The relevant provisions for the crossings of Railway Tracks by the power
lines are as under: The minimum height above rail level of the lowest
portion of any conductor under conditions of maximum sag are as follows in
accordance with the Regulations for Electrical Crossings of Railway Tracks,
1963:
(i) FOR UNELECTRIFIED TRACKS OR TRACKS ELECTRIFIED ON 1500 VOLTS D.C.
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Broad Gauge
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Meter and Narrow Gauge
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Inside
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Outside
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Inside
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Outside
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station
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station
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station
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station
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limits
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limits
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limits
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limits
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(mm)
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(mm)
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(mm)
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(mm)
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66 KV
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10,300
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7,900
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9,100
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6,700
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132 KV
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10,900
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8,500
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9,800
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7,300
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220 KV
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11,200
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8,800
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10,000
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7,600
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440 KV*
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13,600
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11,200
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12,400
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10,000
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(ii)
TRACKS ELECTRIFIED ON 25 KV A.C.
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For Broad, Meter and Narrow Gauges
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Inside
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Outside
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station
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station
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limits
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limits
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(mm)
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(mm)
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66 KV
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13,000
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11,000
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132 KV
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14,000
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12,000
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220 KV
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15,300
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13,300
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440 KV*
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16,300
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14,300
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* Tentatively assumed.
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No conductor of an extra high voltage overhead line
crossing a tramway or trolley bus using trolley wires should have a
clearance less than 3050 mm above the trolley line.
The provisions of the above Regulations must be kept in
mind while carrying out the patrolling of Transmission lines. Any deviation
noticed should be reported / attended on top-priority.
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