In this video the high voltage transmission line workers are wearing a Faraday cage suit. Why is this needed?
Without the Faraday cage, the resistance of the human would be very high compared to the transmission line, so practically no current would flow through the worker (i.e. the reason why birds don't get zapped).
With the cage, some current would probably flow through it, but still nothing should go through the worker. The only purpose of the cage that I could think of is that when the man touches (or is near, rather) something (e.g. a tree, or the helicopter) at a different potential than him, the current would go through the cage instead of him. Is this a reason and is it the only one?
A clearer question: why a Faraday suit and not an insulating suit?