In a "high risk" course I have attended and IIRC a first aid course or 2, have spoken about how to deal with step voltage from downed power lines. The first aid course took the scenario of a first aider approaching a scene where there were power lines down over a vehicle or structure. It was suggested to approach slowly taking very short steps or shuffling feet along the ground, and paying particular attention to whether you could feel a static building in your body, something like hair beginning to stand on end or similar. Backing away if this sensation was to be felt, and incident to be left till supply orthority turned up and deemed location to be safe.
The "high risk" course went into a little detail about how to deal with the scenario of the plant your are in operation of coming into contact with power lines. It was recommended to jump clear of plant to avoid coming in contact with the body of the machine and the ground simultaneously, and then taking shuffling steps away to prevent large step voltage.
As an electrician with quite a few years experience, some of the ideas that were put forth in both courses were a little short on detail and managed to make things too simple to feel safe about. As everything generally is, electricity is another one of those which can be very complex and a simple explanation can do more harm than good.
On a couple of occasions doing work, I have had a 'volt stick' (simple pen size device to indicate presence of voltage) in my top pocket light up as I have inadvertently come into contact with a 'live' wire or connection, and become raised to the same potential as the supply. Usually whilst up a fiberglass ladder using insulated pliers and wearing appropriate rubber soled footware. Becoming that 'bird on the wire' reinforces how critical being insulated from ground is! 'You' also become aware of other people around you who my compromise 'your' insulation.
Out of interest and possibly to correct a couple of small social innacuracies.
The general use of "high voltage" frustrate me. In Australia, "High voltage" refers only to voltage OVER 1000V
Low voltage is from 50 - 1000V
Extra low voltage <50VAC or 100VDC
Mains voltage is 230-240vRMS (root mean square [being alternating current, an equivalent direct current comparison needs to be drawn] which makes the power between AC and DC voltage the same when peak AC voltage is divide by root2) single phase or 340v peak.
A 10amp switch will/should have a voltage type indicated (or any current breaking device), as it is far easier to break an AC current than a DC one. Both AC and DC will draw an arc when a switch starts to open, but because AC is cycling through 0 volts and 0 current 100 times per second, breaking that arc is far simpler.
Leaving a power point on will not result in a pool of electricity on the floor in front of the power point!