Electrical Safety Clearance (Part-1) AUGUST 8, 2012 9 COMMENTS Standard: Qatar General Electricity & Water Corporation Minimum Safety Clearance of Pipelines from Electrical Tower: Description Voltage 33KV/66KV/132KV 220KV/400KV The right of way (ROW) (widths on either side of the center line of overhead transmission lines ) 25 Meter 50 Meter Other than the roadways and boundary fences of security establishments any temporary or permanent structures / buildings, parapet walls, Not within 25 Meter Not within 50 Meter With All Underground services crossing the way leave (from the nearest tower foundation) 35 Meter (Min) 50 Meter (Min) The nearest side of the road reservation to the nearest tower foundation 25 Meter 35 Meter,50 Meter The pipelines (water, oil/gas etc.) crossing (respectively away from the nearest base of 25 Meter (Min) 35 Meter(Min) ,50 Meter(Min)
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Standard: Qatar General Electricity & Water Corporation
Minimum Safety Clearance of Pipelines from Electrical Tower:
DescriptionVoltage
33KV/66KV/132KV 220KV/400KV
The right of way (ROW) (widths on either side of the center line of overhead transmission lines )
25 Meter 50 Meter
Other than the roadways and boundary fences of security establishments any temporary or permanent structures / buildings, parapet walls,
Not within 25 Meter Not within 50 Meter
With All Underground services crossing the way leave (from the nearest tower foundation)
35 Meter (Min) 50 Meter (Min)
The nearest side of the road reservation to the nearest tower foundation
25 Meter35 Meter,50
Meter
The pipelines (water, oil/gas etc.) crossing (respectively away from the nearest base of tower leg). Pipe-lines shall not be laid parallel to the overhead line within the limits of a way leave (ROW).
25 Meter (Min)35
Meter(Min) ,50 Meter(Min)
Cables crossing the transmission lines way leave
25 Meter 35 Meter,50 Meter
(ROW) respectively away from the nearest base of tower leg.
Foundations and civil structures (Temporary or permanent) will not be permitted in the close proximity to the cable circuit. A minimum horizontal distance from such structures to the nearest edge of the cable trench shall be observed
Min 1.5 Meter Min 1.5 Meter
Clearance among Electrical Line-Telephone- Water-Sewerage -Gas Line
Service Vertical Clearance(Min)
Water Line (to cross below EHV cable level)
0.5 Meter
Sewerage Mains (to cross below EHV cable level)
1.0 Meter
Drainage Mains (to cross below EHV cable level)
0.5 Meter
Gas pipes 0.6 Meter
Telephone lines 0.5 Meter
LV / 11kV cables 0.5 Meter
Safety Clearance for Excavation of Land :
Type of Excavation Distance
Use of heavy mechanical excavators (other than hand operated pneumatic jack hammers) or driving sheet piles
Not less than 3 Meter from the edge of cable, cover, cable joint
Heavy machinery engaged in the civil construction or road works
operating load/thrust/ weight will not be applied directly on the cable installation
Trench excavations parallel to the cable installations
Minimum separation of 1 Meter to the nearest edge of cable tile
Laying of metal pipes over a long distance parallel to cable
Not permitted unless the Step and Touch Potentials at any point of the pipe line do not exceed 65 Volts.
(A) Inside Towns
Distance between Tower’s foundation to Pipeline in parallel and intersections.
Voltage Min Distance
380/220V 0.5 Meter
20KV 2 Meter
63KV 7 Meter
132KV 10 Meter
230KV and Above 20 Meter
Distance between underground power cables to wall of gas pipelines in parallel routes.
Voltage Min Horizontal Distance
Min Vertical Distance
380/220V 1 Meter 0.5 Meter
20KV 2 Meter 1 Meter
63KV 3 Meter 1.5 Meter
(B) Outside of Towns:
Distance between Tower’s foundation to Pipeline in parallel and intersections.
KVMin Distance in
Parallel Route (Up to 5 Km)
Min Distance in Parallel Route (Above 5 Km)
20KV 20 Meter 30 Meter
63KV 30 Meter 40 Meter
132KV 40 Meter 50 Meter
230KV 50 Meter 60 Meter
400KV 60 Meter 60 Meter
Distance between overhead lines to gas pipelines at intersections.
KV Min Distance
20KV 8 Meter
63KV 9 Meter
132KV 10 Meter
230KV 11 Meter
400KV 12 Meter
Distance between Tower’s foundations to gas pipelines at intersections.
KV Min Distance
20KV 20 Meter
63KV and Higher 30 Meter
Right Of Way (R.O.W) From Roads:
Highway Distance
High Way : (38 meter from one side of Central Line of Highway)
76 Meter
First Class State Road=(22.5 meter from one side of Central Line of Highway)
45 Meter
Second Class State Road=(17.5 meter from one side of Central Line of Highway)
35 Meter
Third Class State Road =(12.5 meter from one side of Central Line of Highway)
25 Meter
Forth Class State Road=(7.5 meter from one side of Central Line of Highway)
15 Meter
General Electrical Safety Clearance:
KV Description Distance
Up to 11 KVAt points where the lines cross roads or
railwaysMin 6 Meter Height
Up to 11 KV parallel to roads the Min 5.5 Meter Height
Up to 11 KVlines cross totally
desert regions where no traffic is possible
Min 5.5 Meter Height
20 KV to 66 KV
All Location Min 6 Meter Height
Up to 11 KV Conductor JointNo joint shall be closer
than 3 meters to a point of support
33 KV & 66 KV
Conductor Joint No tension joints shall be used unless specially approved.
Standard: Northern Ireland Electricity (NIE), 6/025 ENA
Clearances of Electrical Line to Ground and Roads:
Description of Clearance
0.4 KV
11 KV
33KV
110KV
220 KV
400KV
Line conductor to any point not over road
5.2 Meter
6.1 Meter
6.4 Meter
6.4 Mete
r
7.0 Meter
7.0 Mete
r
Line conductor to road surface
5.8 Meter
6.1 Meter
6.4 Meter
6.4 Mete
r
7.4 Meter
8.1 Mete
r
Line conductor to road surface of high load routes
6.9 Meter
6.9 Meter
6.9 Meter
7.2 Mete
r
8.5 Meter
9.2 Mete
r
Bare live metalwork ( transformer terminals, jumper connections, etc)
4.6 Meter
4.6 Meter
4.6 Meter
- - -
Clearances of Electrical Line to Other Objects:
Description of Clearance
<11 KV
33 KV
110KV
220KV
400 KV
Line conductor or bare live metalwork to any object that is normally accessible (including permanently mounted ladders and access platforms) or to any surface of a building
3.0 Mete
r
3.0 Meter
3.4 Meter
4.6 Meter
5.3 Meter
Line conductor or bare live metalwork to any object to which access is not required AND on which a person cannot stand or lean a ladder
0.8 Mete
r
0.8 Meter
1.2 Meter
2.4 Meter
3.1 Meter
Line conductors to irrigates, slurry guns and high-pressure hoses
30 Mete
r
30 Meter
30 Meter
30 Meter
30 Meter
Line conductors to playing fields
8.5 Mete
r
8.5 Meter
8.5 Meter
8.5 Meter
8.5 Meter
Line conductors to Caravan Sites
9.0 Mete
r
9.0 Meter
9.0 Meter
9.0 Meter
9.0 Meter
Horizontal clearances to wells
15.0 Mete
r
15.0 Meter
15.0 Meter
15.0 Meter
15.0 Meter
Clearances of Electrical Line to Trees and Hedges:
Description of Clearance
<11 KV
33 KV
110KV
220KV
400 KV
Line conductor or bare live metalwork to trees or hedges unable to support a ladder or being climbed.
0.8 Mete
r
0.8 Meter
1.2 Meter
2.4 Meter
3.1 Meter
Line conductor or bare live metalwork to trees or hedges capable of supporting a ladder or being climbed.
3.0 Mete
r
3.0 Meter
3.4 Meter
4.6 Meter
5.3 Meter
Line conductor or bare live metalwork to trees falling towards the overhead line with the line conductors hanging vertically.
0.8 Mete
r
0.8 Meter
1.2 Meter
2.4 Meter
3.1 Meter
Line conductors to trees in Orchards
3.0 Mete
r
3.0 Meter
3.4 Meter
4.6 Meter
5.3 Meter
Clearances of Electrical Line to Street Lighting:
Description of Clearanc
0.4 KV
11 KV
33KV
110KV
220 KV
400KV
e
Line conductor to Lantern on same pole
1.0 Meter
- - - - -
Bare line conductor to lantern or column below.
1.5 Meter
- - - - -
Insulated line conductor to column
0.3 Meter
- - - - -
Insulated line conductor to lantern
1.0 Meter
- - - - -
Column to nearest LV pole
1.5 Meter
- - - - -
Line conductor to street lighting column with
(i) Column in normal upright position.
- 1.7 Meter
1.7 Meter
2.3 Meter
3.3 Meter
4.0 Meter
(ii) Column falling towards line with line conductor hanging vertically only
- 1.7 Meter
1.7 Meter
2.3 Meter
3.3 Meter
4.0 Meter
(iii)Column falling towards line
- 0.4 Meter
0.4 Meter
0.8 Meter
1.4 Meter
1.9 Meter
Clearances of Electrical Line to Waterways:
Description of Clearance
0.4 KV
11 KV
33KV
110KV
220
KV
400KV
Navigable Waters:Lower bank to conductor or earth wire
10.5
Meter
10.5 Meter
10.5 Meter
10.5 Meter
10.5 Meter
10.5 Meter
Minor Watercourses :Lower bank to conductor or earth wire
7.6 Meter
7.6 Meter
7.6 Meter
7.6 Meter
7.6 Meter
7.6 Meter
Clearances to Railways:
Description of Clearance
0.4 KV
11 KV
33KV
110KV
220 KV
400KV
Line conductor to ground level
6.1 Meter
6.1 Meter
6.1 Meter
6.7 Mete
r
7.0 Meter
7.6 Mete
r
Line conductor to ground level on or across vehicle parks
7.6 Meter
8.5 Meter
8.5 Meter
9.1 Meter
9.4 Meter
10.1 Meter
Line conductor to ground level at roads and yards, where road mobile cranes are likely to be employed
10.7 Meter
10.7
Meter
10.7
Meter
11.2 Mete
r
11.5
Meter
12.2 Mete
r
Line conductor to Rail
7.3 Meter
7.3 Meter
7.3 Meter
8.0 Meter
8.2 Meter
8.8 Meter
level
Line conductor to the level of buildings, gantries or other structures (including those carrying traction wires) on which a man may be
3.0 Meter
3.0 Meter
3.0 Meter
3.7 Meter
4.6 Meter
6.1 Meter
Line conductor to poles and other projections.
2.4 Meter
2.7 Meter
2.7 Meter
3.0 Meter
3.7 Meter
5.5 Meter
Line conductor to any other wire other than traction wires.
1.8 Meter
1.8 Meter
1.8 Meter
2.4 Meter
3.0 Meter
3.7 Meter
Clearances of Electrical Line to Fuel Tanks:
Description of
Clearance
0.4 KV
11 KV
33KV
110KV
220
KV
400KV
Horizontal clearance from line conductors to petrol tanks and vents
15 Meter
15 Meter
15 Meter
15 Mete
r
15 Meter
15 Mete
r
Horizontal clearance from line conductors to liquid
gas tanks
(1) 459 to 2273 litre capacity
3.0 Meter
3.0 Meter
3.0 Meter
3.4 Mete
r
4.6 Meter
5.3 Mete
r
(2) 2274 to 9092 litre capacity
7.6 Meter
7.6 Meter
7.6 Meter
7.6 Mete
r
7.6 Meter
7.6 Mete
r
(3) More than 9093 litre.
15 Meter
15 Meter
15 Meter
15 Mete
r
15 Meter
15 Mete
r
Vertical clearance from line conductors to fuel oil tanks
Please refer Clearances to Objects
Clearances of Electrical Lines to other Electrical Lines:
Description of
Clearance
0.4 KV
11 KV
33KV
110KV
220 KV
400KV
Lowest line conductor or earth wire of upper line to highest line conductor of lower line.
1.0 Meter
1.8 Meter
2.0 Meter
2.5 Mete
r
3.7 Meter
4.4 Mete
r
Lowest line conductor or earth wire of upper line to earth wire of lower line where erected.
0.7 Meter
1.4 Meter
1.6 Meter
2.5 Mete
r
3.7 Meter
4.4 Mete
r
Lowest line conductor or earth wire of
2.7 Meter
2.8 Meter
3.0 Meter
3.4 Mete
r
4.6 Meter
5.3 Mete
r
upper line to any point on a support of the lower line on which a person may stand.
Support of upper line and any conductor of lower line.
7.5 Meter
7.5 Meter
7.5 Meter
15 Mete
r
15 Meter
15 Mete
r
Vertical Passing Clearance (sites where vehicles will pass below the lines):
Description of Clearance
<33 KV 110KV 220KV
400 KV
Passing clearance: fixed height loads
0.8 Meter
1.4 Meter
2.4 Meter
3.1 Meter
Passing Clearance: variable height loads.
2.3 Meter
3.2 Meter
4.1 Meter
5.0 Meter
Horizontal Clearance (sites where there will be no work or passage of plant under lines):
Description of Clearance
<33 KV 110KV 220KV
400 KV
Minimum horizontal distances to safety barriers
6.0 Meter
9.0 Meter
12.0 Meter
14.0 Meter
Distance between Conductors of Same/Different Circuit (On Same Support):
Higher Voltage of either Circuit
Lower Voltage of either Circuit
Distance between Circuits
< 33 KV < 1 KV 1.0 Meter
< 33 KV > 1 KV 1.2 Meter
33 KV to 110 KV < 1 KV 1.5Meter
33 KV to 110 KV > 1 KV 2.0 Meter
Above 110 KV All 2.5 Meter
Vertical Distance between Conductors of different Circuit (On Different Support):
Higher Voltage of either Circuit Distance between Circuits
< 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
220 KV 2.8 Meter
Distance between Conductors (Taken down from Pole to other Support, on Transformer):
Voltage Distance between Circuits
11 KV & LV Line 0.60 Meter
22 KV & LV Line 0.75 Meter
33 KV & LV Line 0.90 Meter
Horizontal Distance of Telecommunication Line & Overhead Line:
Description of Clearance Distance
Telecommunication Line(Not insulated) to HV Line
Min 1.6 Meter
Telecommunication Line (Bare) to LV (Bare) Line
Min 1.2 Meter
Telecommunication Line (Covered) to LV (Bare) Line
Min 0.6 Meter
Telecommunication Line (Bare) to Stay (Bare) Wire
Min 0.3 Meter
Passage Way for Metal clad Switchgear:
Description of Clearance Distance
Clean &unobstructed Passages at the front of any Low/High Voltage Switchgear.
1.0 Meter wide & 2.5 Meter
high
Clean &unobstructed Passages at side or under any earthed enclosure containing Bare Conductor
0.8 Meter wide & 2.2 Meter high
Safe approach distance for Person from Exposed Live Parts: