Electrical Safety Clearance (Northern Ireland Electricity )(Part-3)

ELECTRICAL SAFETY CLEARANCE (NORTHERN IRELAND ELECTRICITY) (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

7.0 Meter

Line conductor to road surface

5.8 Meter

6.1 Meter

6.4 Meter

7.4 Meter

8.1 Meter

Line conductor to road surface of high load routes

6.9 Meter

7.2 Meter

8.5 Meter

9.2 Meter

Bare live metalwork ( transformer terminals, jumper connections, etc)

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

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

Horizontal clearance from line conductors to liquid gas tanks

(1) 459 to 2273 litre capacity

3.0 Meter

3.4 Meter

4.6 Meter

5.3 Meter

(2) 2274 to 9092 litre capacity

7.6 Meter

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