So in reading this, I'm not sure that the humidity/dampness question was addressed; does the dryer or outlet need additional protection because of shower steam? If not, then why not just provide the existing connection to the new location?
Zannej: I haven't read anywhere how he plans to vent the dryer in it's new location. he does have a plan, ........doesn't he?
Since he is moving the dryer to an exterior wall, he will put a hole in the wall behind the dryer and vent it. I am trying to talk him in to getting a cheap wall-mount vent fan to push moisture out of the house (mounted to the exterior wall) since he has no attic access and his ceiling is made up of a bunch of thin wooden slats that look like the rolltop part of a desk or bread box.
I will have to confirm that he has a GFCI outlet for the washing machine that is properly grounded. Would it be a 20amp?
I may dig in to my funds for my own reno and pay for the wire and fan for him if he can't afford it, and I believe I already have a dryer vent ducting kit in a box somewhere.
I'm still nagging him about doing the plumbing for his washing machine properly. If I could fit my fat behind under his house easily, I'd be tempted to go over there and fix the standpipe (he put the trap under the house against my strenuous objections). But, my main concern is that nobody gets electrocuted so I want to make sure he has the proper wiring and outlets for the appliances and some way of mitigating moisture build up. Secondary to that, I'm trying to convince him to put another layer of plywood down across the joists at least underneath the appliances because he only has one layer and I'm afraid it won't be sturdy enough.
I believe his existing connection for his dryer (in the adjacent room) is only 3-prong and I would like for him to get the 4-prong kind. I'd actually like for him to get a newer dryer, but that costs $ and he's pretty much broke bc things keep breaking.
TL: DR? Yes, he has plans to put a new dryer vent in the wall and his old dryer power outlet is not as safe so I think he should get the 10/3 ground to replace 10/2 ground (if he even has 10/2-- that place is total clusterf***).
Editing because I was typing this while afjes was posting. Not sure how to quote his post for this, but the 4-prong being safer is exactly why I want him to change it and why I want to use 4-prong for my own dryer when I remodel. When I was researching, I read that 4-prong was safer. My friend already got zapped very badly before working on something for his grandparents. He wasn't able to drive for years because it left his feet and right hand numb. He regained sensation in his feet, but still doesn't feel much in his right hand. He's got terrible luck and I don't want want to chance anything.