Free Space of 500 kV Transmission Line

L H IC

D

9 m

15 m

15 m

30.5 m

Notes: L = Distance from pole tower/conductor pole vertical axis H = Horizontal distance caused by conductor swing I = Switching impulse free distance

17.0 m

Minimum Vertical Free Distance from Conductor (C)SNI 04.6918 – 2002

No Location of

Minimum free

distance

(m)

1. Open Field or open areaa 12.5

2. Area with certain condition

2.1 Building, bridgea 9.5

2.2 Plants, forest, plantation 9.5

2.3 Road/highway/railwaya 15.0

2.4 Public fielda 18.0

2.5 Other EHV/LV/MV transmission line, telecommunication network, antenna,

and cable carb

8.5

2.6 Highest point of boat pole at the position of high/highest tide at water wayb 8.5

NOTES:

a : Minimum vertical free distance measured from land surface or road/railway surface

b : Minimum vertical free distance measured until highest/nearest point

Minimum Horizontal Free Distance from Axis of Tower/PoleSNI 04.6918 – 2002

No Aerial network

Distance from tower/pole

vertical axis to conductor

Horizontal distance

caused by conductor

swing

Switching impulse free

distance

Total distance

Rounded distance

L(m)

H(m)

I(m)

L+H+I (m) (m)

1. 500 kV transmission - single circuit

12.00 6.16 3.10 21.26 22.00

2. 500 kV transmission -double circuit

7.30 6.16 3.10 16.56 17.00