I've been using EVGA Supernova 1600W power supplies to run my S7s and they're working well but I've got new ones on the way and miners running in 3 rooms of the house. It's fine now that winter is mostly here but It would be better to have all the folding rigs in the basement. Right now I can have 2 s7s down there on 2 different breakers but would it be possible to use the wall socket for the washer and dryer to power 2 more miners down there? Is anyone doing this now? Any suggestions on adapters to go from the heavy duty socket to PDU or normal 3 prong?
it safer to put in another line at maybe the same cost of what your tiring with less risk to your home if your box has the room
.. if it doesn't that might become another issue at some point and buy a used PDU , but then again I'm not sure what you might call a lot of money for a PDU. I would plug the PDU direct into the wall they all come with long enough cords so you can pretty much set it up all most any place you want to and at no risk of extending some thing that is made to be plugged directly in to the wall with no in between. to me plugging a PDU into another plug just to use it, is like using a extension cord to plug in another extension cord for more plugs which can be very unsafe . but that's me . and PDU's do have extensions you can add on them that are safe but be care full not to over load one . 
