2007-01-09 22:10:16 · 5 answers · asked by anil d 1 in Science & Mathematics ➔ Physics
To be on the highest point of the electrical line, and so, to be the first one to be hit by lightning and protect the line itself...
2007-01-09 22:15:26 · answer #1 · answered by just "JR" 7 · 0⤊ 0⤋
if your talking about UK the wire on top of high voltage pylons isn't an earth, the wire in top is a signal wire, its an extra way for the power companies to get revenue. its usually fibreoptic but multi-cored copper are occasionally used.
in UK earth is never carried on overhead lines, for example a typical UK installation might have 4 wires to it, 3 phases @ 240v AC each, combined and taking into account phase asyncrasies that gives 415v AC. the fourth wire is called neutral, although it is actually a transformer earth. the earth at your 3 pin plug comes from a copper rod stuck in the ground somewhere near the back door.
charlie
2007-01-09 22:21:22 · answer #2 · answered by peppypop 2 · 0⤊ 0⤋
the suitable EARTH WIRES ABSORBS severe VOLTAGE present day FROM THUNDER,LIGHTENING for the time of wet SEASON AND TRANSMIT the present with the aid of the TOWER physique TO the floor competently.FOR THAT ONE EARTH PIT OF approximately 15 ft intensity AND length 3' X 3' is stuffed with CHARCOAL AND SALT (SODIUM CHLORIDE) WITH EARTH PIPE of two" DIAMETRE AND top 12' IS BURRIED interior the PIT.THE EARTH PIPE AND the backside STUB OF THE TOWER physique IS CONNECETED WITH A 5' length EARTH twine AND BOLTED jointly.
2016-12-12 08:16:44 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Protection Against Lighting & unbalanceing of load
2007-01-09 22:18:21 · answer #4 · answered by R.T.Dharaneeswaran . 1 · 0⤊ 0⤋
to colect lightning energy to earth
2007-01-09 22:14:01 · answer #5 · answered by keral 6 · 0⤊ 0⤋