Well, from "playing" with a 100kV hipot, 33kV DC will only jump about 2", however all of the NFPA 70E approach distances apply. I am not saying it is safe to be 2" away! 70E Distances LAB=5', RAB=2'7", PAB=10".
The RAB is derived from the OSHA approach distances that have a 2' "buffer" zone, so they are implying that it will jump 7".
33kV DC would probally not cause ventricular fibrilation but rather travel across the skin causing serious 3rd degree burns, it would be ugly.
I recommend you read Rapheal Lee's papers for more information.