Need help identifying type of 240 wires
Need help identifying type of 240 wires
Hello,
I have been doing a lot of work remodeling a house I bought. The house was in really rough shape so I was expecting a good bit of work but the last owners laziness and incompetence has really made things worse.
They had the house split into two apartments and we are converting it back to a single home unit. We knocked out a wall and installed new stairs to connect the top and bottom floors. Next we are converting the upstairs kitchen to a laundry room. We have been using the makeshift room for a few months, but we are getting a new washer and dryer. Our current dryer is a compact electric dryer that runs on a 120v outlet. The new will be a standard electric dryer and need a 240v outlet. There is 240v outlet in the room for a range. I am going to pick up a new breaker from lowes with the proper amperage but wanted to check everything else first and I think I ran into an issue with the wire itself.
There are 3 wires, which matches the outlet so I am assuming it is supposed to be 2 hots and a neutral. However, upon closer inspection there is no insulation on the neutral. I peeled back more of the larger insulation around all 3 wires but the neutral wire is uninsulated like it was a ground. Now, I have encountered this in the house elsewhere. Most of the outlets have grounds cut off, but a 3 way switch didn't have the second hot wire so they used the ground as the second hot. I got that "fixed" (I unhooked everything and made it a single switch/light circuit and eliminated the second switch). But I don't know of any 240v wire combinations that would only be 3 wires and include a ground. The wire is definitely thick enough to be 240v wire and each individual wire has multiple "threads" like a 240 wire would. But it is older wire as well so I am not sure if it is just that old that they didn't insulate neutrals when they did this. Is this wire safe to use?
A second, and more minor question, deals with a separate circuit. The house electric is still split and I pay 2 bills, one for upstairs and 1 for downstairs. The upstairs does have an outdoor AC unit on it as well that was installed after we moved in by an HVAC tech so I am trusting that to be installed right. But the entire box for the "upstairs" has 4 breakers. There is a 50amp, 40amp, and 20amp double pole breakers and a 10amp single pole. The 10amp controls a single light and one of the 240v breakers controls the AC. Another controls the range/future dryer outlet. The The 20amp double pole controls everything else upstairs which is ALL 120v. There are a few lights and all of the outlets. Is that safe? Is there a reason to do that? The upstairs is pretty small if that makes a difference, I have just never seen a double pole breaker used for a 120v circuit even if it is pretty large.
Edit: I made the original post on my PC due to the size but I’m adding some pictures from my phone
Edit 2: I am going to buy and run new wire with the new breaker. I showed a picture to my dad and he said nothing matters because that’s an aluminum ground which means the wire needs replaced due to its age regardless. So even if it’s wired wrong now, I am stripping the wire out and putting a new wire and breaker in so it should be done right
That wire looks absolutely ancient. I would call it a fire hazard and just replace it outright.
Shouldn't it just be the 2 hots and the ground though? 240v doesn't use an extra wire afaik, unless you're thinking 3phase or something.
To your edit, it should be 2 hots and a neutral is my understanding. Hots deliver electric and neutrals complete the circuit back to the back. In newer wiring the 4th is the ground but a 240v 3 wire has no ground. However, if it is a neutral it should be sheathed and individually insulated.
That being said, I’m not an electrician and most of this is just what I’ve learned from replacing outlets and rerunning 120v wire in this house. If an electrician wants to tell me I’m wrong I’m all ears
If you’re in North America, which I assume you are based on the 120v wires, then your assumption about 240v power is a bit off. Both wires can be a hot (120v) wire, 180° out of phase from each other, so they add to 240v. In this case, a neutral wire isn’t necessary to carry the current back, the other hot wire does that. A neutral wire may be used, but then there would be 4 wires.
The ground wire and the neutral wire actually connect to each other in the panel, but it’s not safe to use a ground wire in place of a neutral, so definitely don’t wire it to the neutral on the outlet.
If you are unsure of what’s going on with this set of wires, you should really call an electrician to help. Wiring a standard 120v outlet is something a homeowner can do, but identifying an old 240v cable on a dubious circuit is definitely something a qualified electrician should do.
The two hots give you 240 across them, but in North america an appliance may run 120 for standard control functions and 240 for heating functions, so in thise cases you need a neutral to provide a 120 pathway. you will see 240 stove appliance plugs have 4 prongs. 2 hot, 1 neutral and a ground. That wiring looks like a time before grounds were used.
It does look bad and I plan to replace it regardless. I’m more so wondering if it needs replaced now. Wire is expensive and replacing this will be pretty extensive as I would need to tear out horse hair plaster to unstaple it from the studs. I’m not 100% on if it’s stapled or not but it’s tough to move and the other wires I replaced were stapled down so we had to tear open the plaster and run them that way. This would be going from 2nd story to basement through kitchen behind the sink so it’s not a quick job. If it needs replaced now I’m gonna need to cancel the whole weekend
I'm not an electrician, please consult with one if you're unsure.
I think Shadow is right on both counts.
The wire is very old. Personally, I would rip it out, but that is a risk assessment you have to make.
A 240V circuit, in North America, gets there by having two hot wires one on each of the 120V circuts from the transformer in the street. So no neutral wire is needed to complete the circuit. If you want to think about electricity "flowing" it flows from one pole to the other (instead of to the neutral in a 120V circuit). The unshielded wire is your ground.
This is a decent guide: https://www.thespruce.com/installing-a-240-volt-circuit-breaker-1824649
Please make sure you understand their point about what the main breaker does and does not disable.
Best of luck, looks like you're tackling a tough but fun project.
Yeah, my first thought was to come into this thread and answer "I've identified it as the kind you replace"
Look at the wires in those pairs, they look like they're falling apart from each other. Do you really want to risk an area in the wall where one of those wires being thin/having strands broken which is going to cause it to heat up inside your wall?
This has fire hazard written all over it. Just replace the wire and stop trying to take the easy way out. You'll thank yourself later when you still have a house to go home to.
Also OP, what year was your house built? Assuming you're in the US if it was built in the 70s or 80s that could be aluminum wire, which you absolutely should not connect to anything that is copper due to fire hazard. The aluminum and copper together cause corrosion which makes the wires not make good electrical contact and thus it heats up and causes a fire.
Please just replace the wire and don't try to use it.
Edit: just saw your edit. Yeah, it was aluminum, glad you're replacing it.
I just finished running the new wire. I really lucked out. My step dad has a 50’ fishing tape and a 10’ endoscope that I was able to borrow. I got a new 10/2 wire pushed through fine. I called whirlpool for the specifications and they said the dryer needs 30 amps and will work with 10/2 or 10/3 wire. I was gonna go for the 10/3 but both lowes and Home Depot were sold out so I went with the 10/2. Got a 25’ roll and it used most of it. Maybe a foot of slack
Awesome!! Glad to hear it. As long as the dryer doesn't need the 4th wire for 120v separate from the 240v you should be fine. Hopefully whirlpool didn't tell you the wrong thing. Kinda stinks for future upgradability though in case you wanted to get a dryer down the line that requires the 3rd conductor.
