Answer / me

The short answer is they are not grounded. You can hang from a line also and not be harmed, but don't try it as if you do it wrong you can be severely hurt or killed. So what does "they are not grounded" mean? Electric current flows from high voltage to low voltage. The power line is high voltage. The earth, or ground, is low voltage. Anything in contact with the earth is also at the same low voltage. That is why there are insulators between the lines and the poles. The higher voltage the lines, the bigger the insulators. You can see this for yourself by looking at a high voltage tower versus a typical wooden power poll. When the bird lands on the line, it is only in contact with the line. There is no path to the lower voltage ground for the electrical current to flow thorugh. No current flow means no harm to the bird. People get into to trouble with power lines because they are almost always in contact with the pole or the ground when they, or something they are holding, touch the line, which means the current flows through them to the lower voltage. Note that the lower voltage does not have to be zero volts. It just has to be lower than the high voltage for the current to flow. It is not the voltage that kills you. It is the combination of voltage and current. No current or low current, no harm. When you scoot your feet on the carpet on a dry day and touch the door knob, a spark jumps and you feel a small snap. Your skin is charged up to 10's of thousands of volts, but there is very little current flow, so no harm is done. Hope this helps.

Read more: http://wiki.answers.com/Q/Why_can_birds_stand_on_overhead_transmission_lines_without_suffering_any_harm#ixzz2B8p2CfTP

Answer / santhisenan

charge flow is called current. the current will flow
through the conductor only if the onductor has pottential
difference. Here since the bird is sitting with its legs on
the same line the potential difference across the bird is
zero.(both legs are at the same potential).Charge will flow
only with potential differnce . So n current flows in this
case...... This is called equipotent surface....

Answer / deependra shakya

TO Senthil Kumar.a & Maris
IF A PERSON WORK IN HIGH VOLTAGE LINE EVENTHOUGH HE CANN'T
TOUCH THE NEUTAL OR OTHER LINE YOU MAY GET SHOCK BECAUSE
ELECTROMAGNETIC INDUCTION EFFECT ARROUND THE CONDUCTOR.
WHEN YOU COME UNDER INFLUENCE OF MAGNETIC FIELD A POTENTIAL
DIFFERENCE IS CREATED AND YOU MAY GET SHOCK.

Answer / nagarjuan

thank u sir for your best answring

Answer / senthil ganapathy

Great answer Saravanan!!!!

Answer / sakila

the bird's leg will make contact with only one phase of the
transmission wire.there will be no short circuit in this
connection.so there will be no current flow through the
body of the bird and it remains safe.when the bird makes
itself in contact with other phase line or with the neutral
line it will be affected.

Answer / sewagudde

its quite simple, air acts as an insulator and thus there
is no path for current flow to earth. however when it gets
in contact with 2 lines, a potential difference is created
resulting in current flow through the bird's body.

Answer / mahmud

Two legs of birds have small distance. So less potential
difference exist and also birds have high body resistence
compare to the the conductor. Thats why they dont get
shock. If we touch one point of a live line then there will
be no return path or potential difference. But if we touch
two points of a live line then we may get shock if those
two points have adequate distance. Because there potential
difference occured.So shock may get by touching a single
live line but touching more than one point at a time.

Answer / sean

there is no blood circulations in the legs ,and the foot of
the bird is coverd by a layer of nonconductive thing.
this is de onny ryt answer buddies....

Answer / rupesh kumar patel

Depend on bird stop and fly position. If bird pankh spread
definite shock notice every time birds jump ground side or
other side, then spread and fly. High voltage line birds
stop only return path line or with out corona line or earth
wire

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