What would cause my stainless washer lines to arc on the dryer vent?

This sounds like a classic case of an **energized chassis** where your appliance frame is looking for a path to ground, and your braided stainless lines are providing it. Those braided lines are basically just a thin wire mesh; they aren't meant to carry current, so they'll glow red hot and melt the inner rubber tube the second they complete a circuit.

The reason your electrician didn't find anything at the outlet is likely becuase he just checked for 240V and moved on. You need to look at the **terminal block** on the back of the dryer where the power cord connects. If you have a 4-prong cord but the internal grounding strap is still connected to the neutral terminal, you're essentially sending return current trough the machine's frame. Alternatively, a wire inside the machine might be pinched against the cabinet, creating a short.

When those water lines touch the dryer vent, they are bridging the gap between a 'hot' machine and a grounded vent pipe (or vice versa). Even if the vent didn't show voltage during a quick test, it might be intermittently grounding through the house structure or the HVAC system. The fact that it happens within 24 hours suggests that whenever a specific cycle runs—maybe the heater or the high-speed spin—the vibration or the power draw is making that electrical leak manifest. Stop using the machines imediately and turn off the breakers. You need a diferent electrician or a very thorough appliance tech to perform a **continuity test** between the power pins and the machine frame. Don't just keep replacing the hoses; you're lucky they're just leaking and haven't started a structural fire behind the wall yet. Check that the neutral and ground aren't swapped at the plug, too. It’s a common mistake during DIY installs or when people move into a new place and have to swap the cord style to match the wall outlet.

Wait, if the frame is acutally energized like that, does it mean I’d get a shock just by touching the door handle? My laundry area gets a bit damp, and now I’m worried to even go near the thing.

Also, coud the vibration from the spin cycle be what's rubbing a wire raw inside? I'm curious if a specific part of the cycle triggers the leak, or if those metal hoses are just acting like a fuse for the whole house. This sounds way scarier than just a simple plumbing leak.

Check your heating element housing. I’ve seen coils sag just enugh when they’re hot to touch the heater box, but stay clear when cold. That whould explain why a quick test didn't show anything; it turns the cabinet into a live wire only during the drying cycle. Also, see where that vent ducting goes. If it’s touching a gas line or copper plumbing, it’s acting as a solid ground for the leak. Those braided hoses have high resistance compared to solid copper wire, so they’ll glow and melt way before a 30-amp breaker ever trips. Keep those breakers off til you check the heater for scorch marks.

You should definitely check if the washer is acutally the source of the juice. Everyone jumps to the dryer because it's the bigger power draw, but a faulty washer motor or a pinched wire in the washer's console can energize its cabinet too. Since the hoses are bolted to the washer, they become live extensions of the frame.

If the dryer vent is grounded elsewhere in the house—like if it's touching a copper pipe or a metal stud—those hoses are basially completing a circuit every time they touch. Try unplugging the washer and see if the 'arc' goes away while the dryer is still on. It might save you from chasing a ghost in the wrong machine.