Item/item | Underground cables | Over head wires |
Public safety/faults & failures | Safer/better | Not safe/higher |
Capital cost/running cost | Expensive/very low | Cheap/high |
Flexibility/appearance | New cell for a cable /invisible | Flexible/visual view |
Operating voltage/voltage drop | Less than 11 kV/low | Any higher/higher |
Damage strokes/HF interference | No lighting & thunders /non | Affected possibility/possible |
Jointing/fault location | Difficult/difficult | Simple/cheaper |
Surge effect/charging current | Smooth due to sheath/higher | Direct effect/only for long lines |
Maintenance | Expensive | Easy |