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Clothes washer and dryer outlets - Clever configuration.
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It looks like it was too complicated for whoever did the bathroom's circuits to place each outlet to their respective side. This was original to the house. It also seems it was too hard to place the boxes 1/2" out of the studs so they get flush to the drywall.
As we recently proceeded major renovations in the bathroom, I corrected a few things. First the washer's outlet has been moved to a better place, about two feet from the opposite wall you see in the pic (still with drywall). I screwed the box 1/2" out of the stud for a flush fit with the drywall. As of the dryer outlet, since its location was correct, it wasn't worth it to spend time re-screwing the box just to get the 1/2". However the outlet used to be screwed to the box with a mix of various junky screws, they've obviously been replaced with four 8/32 screws, it's now all nice and clean!
One last thing. If you have some basic knowledge of the electrical code, you probably noticed the cables are NOT strapped at 12" or less from the boxes. The 10/3 cable feeding the dryer outlet is pretty rigid and didn't need support in those conditions. When I moved the washer outlet I strapped the white 14/2 cable to the stud and taped the black 14/3 cable to the white one, since I couldn't find another strap LOL.
My bedroom and the bathroom are on the same circuit, which is pretty weird. The white NMD cable from the washer outlet goes to my bedroom. It's also an interesting mix of older cloth-sheathed and PVC-sheathed NMD cables! All are NMD90.
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Oh and another thing I found interesting was that it seems Canadian dryer and range circuits always were four wire too.
My house was built in 1964 and I put alot of electrical upgrades into the house.
My house was built in 1982 and all of those circuits are 4 wire.
Yup, for a short time when NMD90 came out they were still cloth-sheathed, probably to make them cheaper. In my house only some 14/2 cables are PVC-sheathed. Half of the 14/2s and all non/14/2s are cloth-sheathed, yet they have reticulated polyethylene wires inside!, which indicates they are NMD90!
As of the 4-wire circuits, I know that grounding of all outlet was mandatory in Canada in new buildings starting in 1965. Existing building are never forced to change their installations to meet the code when modifications are performed. Although if you add new parts or replace old parts of a system, the new parts must meet the code LOL.