alt Hacker News> I’m dealing with a 75 year old house that’s set up this way
I can’t tell what practice you’re referring to. Are you perhaps referring to older wiring that connects large appliances to a neutral and two hots but no ground, e.g. NEMA 10-30R receptacles? Those indeed suck and are rather dangerous. Extra dangerous if the neutral wiring is failing or undersized anywhere.
But even NEMA 10-30R receptacles are still 120V RMS phase-to-ground. (And, bizarrely, there’s an entire generation of buildings where you might find proper 4-conductor wiring to the dryer outlet and a 10-30R installed — you can test the wiring and switch to 14-30R without any rewiring.)
The exception for residential wiring is when the neutral feed from the utility transformer fails, in which case you may have 240V phase-to-phase with the actual Earth floating somewhere in the middle (via the service’s ground connection), which can result in phase-to-neutral and phase-to-ground measured anywhere in the house varying from 0 to 240V RMS.
> wet bathroom floor
A GFCI receptacle adds a considerable degree of safety and can be installed with arbitrarily old wiring. It’s even permitted by code to install one with no ground connection as long as you label it appropriately — look it up in your local code.
it’s worse than no ground connection. There’s no neutral connection so they replaced neutrals with ground.
I believe that’s kinda naughty.
It works, but it energizes your ground plane and people do get mildly shocked. that’s making me a little nervous.
So holes have been drilled in ceilings and walls and single wire neutrals or grounds have been fished down the walls, repeatedly, by yours truly , but there’s still at least one “gfci” outlet that’s wired this way And they’re balking at getting an electrician back out here for.
bridging neutral to ground because the neutral lines dead, uh, “works” to be technical but whoever did this moved on years ago and heaven only knows how many outlets or fixtures this was done in. I’m just finding out one by one as someone goes “hey this stopped working!”and you pull it and the neutral or ground blew like a fuse.
So that’s my whole point, this is an extremely bad idea for a 3200watt computer.
yes, they are all getting snipped and blank wall plated and marked as hazards that need to be remediated with a Dymo labeler as I discover them.
I don’t work here I just live here and have kind of a slummy owner who doesn’t want to do anything about any of it and doesn’t care if the plumbing or electrical works.
But they paid some guy like $4000 to install a totally unnecessary subpanel that’s bridging conflicting phases into the same circuits because he didn’t figure out this was what was going on. Dios Mio. I would have fixed the whole house for $1000. Miracle this hovel hasn’t burned to the ground yet.
I’m putting up with it for now but should probably bail before it does.