Using wooden ladder near live
HV is not a good idea!
I beg to differ there.
Wooden pole ladders are used over here as a matter of course, by most Lines Companies on voltages of anywhere between 400V and 66kV.
Besides, if you're going to be climbing a pole ladder that will bring you within access distance of bare live lines (of any voltage), you'll be wearing gloves and outers.
And more than likely even fitting line hose over the conductors you aren't actually working on, but are in your immediate vicinity.