Safety Clearance for Electrical Panel


Safety Clearance for Electrical Panel:

 Working Space around Indoor Panel/Circuit Board (NES 312.2):

Voltage

Exposed live parts to Not live parts( or grounded parts ) Exposed live parts to Grounded parts (concrete, brick, and walls). Exposed live parts on both sides

Up to 150 V

0.914 Meter (3 Ft)

0.914 Meter (3 Ft)

0.914 Meter (3 Ft)

150 V to 600 V

0.914 Meter (3 Ft)

1.07 Meter (3’6”)

1.22 Meter (4 Ft)

 Clearance around an Indoor electrical panel (NES 110.26):

Description of Clearance

Distance  (min)

Left to Right the minimum clearance

0.9 Meter (3 Ft)

Distance between Panel and wall

1.0 Meter

Distance between Panel and Ceiling

0.9 Meter

Clear Height in front of Panel>480V

2.0 Meter

Clear Height  in front of Panel <480V

0.9 Meter (3 Ft)

Clearance When Facing Other Electrical Panels < 480V

0.9 Meter (3 Ft)

The width of the workingspace in front of the Panel

The width of Panel or 0.762 Meter which is Greater.

Headroom of working spaces for panel boards (Up to 200Amp)

Up to 2 Meter

Headroom of working spaces for panel boards (More than 200Amp &Panel height is max 2 Meter)

Up to 2 Meter( If Panel height is max 2 Meter)

Headroom of working spaces for panel boards (More than 200Amp &Panel height is more than 2 Meter)

If Panel height is more than 2 Meter than clearance should not less than panel Height

Entrance For Panel (More than 1200 Amp and over 1.8 m Wide)

One entrance required for working space (Not less than 610 mm wide and 2.0 m high )

Personal Door For Panel (More than 1200 Amp)

Personnel door(s) intended for entrance to and egress from the working space less than 7.6 m from the nearest edge of the working space

Dedicated Electrical Space.

Required Space is width and depth of the Panel and extending from the floor to a height of 1.8 m (6 ft) above the equipment or to the structural ceiling, whichever is lower

The door(s) shall open in the direction of egress and be equipped with panic bars, pressure plates, or other devices that are normally latched but open under simple pressure

 

the work space shall permit at least a 90 degree opening of equipment doors or hinged panels

 

 Clearance for Conductor Entering in Panel (NES 408.5):

Description of Clearance

Distance  (min)

Spacing between The conduit

or raceways(including their end fittings) and Bottom of Enclosure

Not rise more than 75 mm (3 in) above the bottom of the enclosure

Spacing Between Bottom

of Enclosure and Insulated bus bars, their supports,

200 mm

Spacing Between Bottom of Enclosure and Non insulated bus bars

200 mm

 Clearance between Bare Metal Bus bar in Panel (NES 408.5):

Voltage

Opposite PolarityMounted on Same

Surface

Opposite PolarityWhere Held Free in Air Live Parts to Ground
Up to 125 V 19.1 mm 12.7 mm 12.7 mm
125 V to 250 V 31.8 mm 19.1 mm 12.7 mm
250 V to 600 V 50.8 mm 25.4 mm 25.4 mm

 Clearance of Outdoor electrical panel to Fence/Wall (NES 110.31):

Voltage

Distance  (min)
600 V to 13.8 KV

3.05 Meter

13.8 K V to 230  KV

4.57 Meter

Above 230 KV

5.49 Meter

 Working Space around Indoor Panel/Circuit Board (NES 110.34):

Voltage

Exposed live parts to Not live parts( or grounded parts ) Exposed live parts to Grounded parts (concrete, brick, and walls). Exposed live parts on both sides

601 V to 2.5 K V

0.914 Meter (3 Ft)

1.2 Meter (4 Ft)

1.5 Meter (5 Ft)

2.5 K V to 9.0 K V

1.2 Meter (4 Ft)

1.5 Meter (5 Ft)

1.8 Meter (6 Ft)

9.0 K V to 25 K V

1.5 Meter (5 Ft)

1.8 Meter (6 Ft)

2.5 Meter (8 Ft)

25 K V to 75 K V

1.8 Meter (6 Ft)

2.5 Meter (8 Ft)

3.0 Meter (10 Ft)

Above 75 KV

2.5 Meter (8 Ft)

3.0 Meter (10 Ft)

3.7 Meter (12 Ft)

 Clearance around an Outdoor electrical panel (NES 110.31):

Description of Clearance

Distance  (min)
Clear work space:  Not less than 2.0 Meter high(Measured vertically from the floor or platform) or not less than 914 mm (3 ft) wide (Measured parallel to the equipment).
Entrance For Panel (More than 1200 Amp and over 1.8 m Wide) One entrance required for working space (Not less than 610 mm wide and 2.0 m high )
Entrance For Panel: On Large panels exceeding 1.8 Meter in width One Entrance at each end of the equipment.
Nonmetallic or Metal-enclosed Panel in general public and the bottom of the enclosure is less than 2.5 m (8 ft) above the floor or grade level Enclosure door or hinged cover shall be kept locked.

 Elevation of Unguarded Live Parts above Working Space (NES 110.34E):

Voltage

Elevation  (min)
600 V to 7.5 KV

2.8 Meter

7.5 K V to 35  KV

2.9 Meter

Above 35 KV

2.9 Meter + 9.5 mm/KV

 Working Space for Panel (Code Georgia Power Company):

Voltage

Exposed live parts to Not live parts( or grounded parts ) Exposed live parts to Grounded parts (concrete, brick, and walls). Exposed live parts on both sides

Up to 150 V

3.0 Meter

3.0 Meter 3.0 Meter

150 V to 600 V

3.0 Meter 3.5 Meter 4.0 Meter

600 V to 2.5 KV

3.0 Meter 4.0 Meter 5.0 Meter

2.5 KV to 9 KV

3.0 Meter 5.0 Meter 6.0 Meter

9 KV to 25 KV

5.0 Meter 6.0 Meter 6.0 Meter

Electrical Safety Clearance (Part-6)


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  (min)
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 & 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

0.9Meter

6.6 KV to 11 KV

3.0 Meter

0.9Meter

11 KV to 22 KV

3.0 Meter

0.9Meter

22 KV to 33 KV

3.0 Meter

0.9Meter

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

Electrical Safety Clearance (Part-5)


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 to300mm 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

Electrical Safety Clearance (Part-4)


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

 

 

 

 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

0.900 Meter

Carriageways (including road crossings)

0.900 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

Upto1KV

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

Electrical Safety Clearance (Part-3)


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 Meter

7.0 Meter

7.0 Meter

Line conductor to road surface

5.8 Meter

6.1 Meter

6.4 Meter

6.4 Meter

7.4 Meter

8.1 Meter

Line conductor to road surface of high load routes

6.9 Meter

6.9 Meter

6.9 Meter

7.2 Meter

8.5 Meter

9.2 Meter

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 Meter

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 Meter

0.8 Meter 1.2 Meter 2.4 Meter 3.1 Meter
Line conductors to irrigates, slurry guns and high-pressure hoses

30 Meter

30 Meter 30 Meter 30 Meter 30 Meter
Line conductors to playing fields

8.5 Meter

8.5 Meter 8.5 Meter 8.5 Meter 8.5 Meter
Line conductors to Caravan Sites

9.0 Meter

9.0 Meter 9.0 Meter 9.0 Meter 9.0 Meter
Horizontal clearances to wells

15.0 Meter

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 Meter

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 Meter

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 Meter

0.8 Meter 1.2 Meter 2.4 Meter 3.1 Meter
Line conductors to trees in Orchards

3.0 Meter

3.0 Meter 3.4 Meter 4.6 Meter 5.3 Meter

 Clearances of Electrical Line to Street Lighting:

Description of Clearance

0.4 KV

11 KV

33KV

110KV

220 KV

400KV

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 Meter

7.0 Meter

7.6 Meter

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 Meter

11.5 Meter

12.2 Meter

Line conductor to Rail level 7.3 Meter 7.3 Meter 7.3 Meter 8.0 Meter 8.2 Meter 8.8 Meter
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 Meter

15 Meter

15 Meter

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 Meter

4.6 Meter

5.3 Meter

(2) 2274 to 9092 litre capacity

7.6 Meter

7.6 Meter

7.6 Meter

7.6 Meter

7.6 Meter

7.6 Meter

(3) More than 9093 litre.

15 Meter

15  Meter

15  Meter

15  Meter

15 Meter

15  Meter

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 Meter

3.7 Meter

4.4 Meter

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 Meter

3.7 Meter

4.4 Meter

Lowest line conductor or earth wire of upper line to any point on a support of the lower line on which a person may stand.

2.7 Meter

2.8 Meter

3.0 Meter

3.4 Meter

4.6 Meter

5.3 Meter

Support of upper line and any conductor of lower line.

7.5 Meter

7.5 Meter

7.5 Meter

15 Meter

15 Meter

15 Meter

 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:

Circuit Voltage

Distance

< 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

6.0 Meter

Electrical Safety Clearance (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 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

Electrical Safety Clearance (Part-1)


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 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 (ROW) respectively away from the nearest base of tower leg.

25 Meter

35 Meter,50 Meter

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.

KV

Min 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 KV

At points where the lines cross roads or railways

Min 6 Meter Height

Up to 11 KV

parallel to roads the

Min 5.5 Meter Height

Up to 11 KV

lines 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 Joint

No 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.
%d bloggers like this: