You want to make sure all connections are secure, since costumes can endure a lot of movement.
Anyway, the electrician got a call from one of his other clients, and mentioned something about a military grade RJ-45 setup (RJ-45 is the cat 5/6 cables used for ethernet cables). I asked him what was a military grade RJ-45, and he said you could pick up your whole computer while it was dangling on the RJ-45 cable. I would imagine that is secure.
I think im going to have to sit down one night with a bottle of wine and just go through this forum for hours reading abou different things with these circuits.