If in doubt, use #22 telephone wire and a 50A C/B.... [Linked Image]

Seriously though, I know the frustration of running into somebody who just doesn't seem to have any idea.

I do answer questions if it seems to me that the person really does have a good grasp of fundamentals and just needs a "gentle prod" in the right direction. Sometimes it's obvious that he'll go ahead no matter what you say to him (*), so do you try to impart some basic knowledge and hope he'll at least have a chance of getting it right, or do you tell him to leave well alone, knowing full well that he is going to ignore your warnings? Tough call.

(*) In my experience it's always him, not her. Is this some sort of male pride at being determined to show everyone his skills, even though he has none? The ladies seem to have much more sense. (Sorry guys, but I'm not talking about the entire male population of course.... [Linked Image])