Have there 2 questions about high-voltage

1. you know, but these lines on the trains or trains to be powered. There, yes a current flowing from Let's say 16kV. Is that really true with 16kV spark can jump up to half a meter? In an accident by as a "surfer" able in the article. I can't believe that somehow.
2. how much mA must actually flow, so that one must reckon with damage of the eyes or blindness through the brightness? also "not special Commissioning jobs line voltage flows" a certain has potential to a point of reference, in which case warsch Earth, or you say it's up to the voltage xxxV

It may be that 50 cm long is the arc in the final analysis, but to ignite half meter in nem brauchts had far more than 16kV. You length of the arc is influenced significantly by the current fire distance from the voltage (knnst with n put some thick bleiakkus LiBos, see Hedgehog xD). One should differentiate between ignition distance and safety distance. An ignition would be 16kV at worst maybe in 5-10 cm distance, but typically in under 2cm. As a precaution however, you should keep a distance to live parts, which is far greater than the ignition distance. That exist appropriate regulations, I know but not by heart. Half a meter safety distance with 16kV seems the absolute minimum but, if you hang on his life.

EDIT: We must also never forget that other effects in play, which can also affect the ignition distance may. For example, the earthed roof of a train can make a capacity against the live wire, which evt. even small currents to flow and thus to ionize the air. The result is a higher electric field strength, which favors a rollover. are 15 kv 16 2/3 Hz. Safety distance of db 1.5 m. as kilovolt wrote, is that the safety distance min. must be maintained from the contact wire. This distance is but "actually" only for ma which, because otherwise no one in this small distance to the wire can come in db. I've seen since a video a while ago, where a person on the roof of a train runs around, and intentionally provides against the line. He went on to "Flame" and was dead within a very short time or completely burned. Only I can't find this video, probably it was deleted because it's so brutal.

If here about 16kV flow at a power of 10MW, enabling up to 625A flow (according to invoice). Is that actually true of human body resistance is not linear? Or higher voltage, so less resistance? Because at that time, as I the video saw where this person has gone up in flames, if the person has a resistance of 1kOhm E.g. enough already 16A with 16kV? So, the man practically represents a short circuit. Thank you for an explanation. It is important to not the power, but the performance, which will be implemented in the arc. Also the power density in the arc (i.e. how many Watts per cubic-inch plasma volume flow) is very important.
In electric welding this power density is very high, so the light is grellweiß and very bright. This can damage the eyes, although the performance is great only a few kW.
If you look, however, in a several meters long arc (for example) 1 mega Volt, 1A, which would be probably not so bad. Performance (1 MW) is much bigger here, but the temperature is low, because the power density is lower. Therefore the arc not as bright lights.

Yes, the body resistance is not linear:
At a few volts, he is so 100kOhm up to 2MOhm.
Mains voltage, the resistance of the skin is no longer effective, then there are still 1...10kOhm.
The water molecules in the body can be ionized more voltage. Then a conductive plasma channel through the whole body can be formed. The resistance can fall here estimated on a few ohms (something like that... is likely to end the but almost always fatal).