Well it depends on the load one supposes. It also then depends on the
voltage on thewwires as the whole idea of using high voltages is to reduce
losses due to disipation when the system is under load.
The answer basically is there is no answer.
Might find more if you asked the max current of the one at xx to yy.
Brian

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"James Wilkinson Sword" wrote in message
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Despite extensive googling, there seems to be nothing that tells me how
much current flows along wires on a national grid pylon. They only list
voltages. Anybody know?