this post was submitted on 26 May 2025
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[–] [email protected] 10 points 1 day ago (1 children)

A former coworker was abroad most of the time. Still, his power meter showed lots of usage during his absence. A tenant in the same house had used such a cord to leech power across the common laundry room.

Now that coworker knew his way about electricity. So instead of the 220V between common and a phase, he rewired his washing machine socket to two different phases, aka 380V, and left for a week.

When he came back, he saw a number of kitchen- and other appliances waiting for trash collection.

[–] [email protected] 1 points 1 day ago (1 children)
[–] [email protected] 2 points 1 day ago (1 children)

Absolutely normal here. Three phases, now 400 instead of 380V back then, 64A. Standard house connection.

[–] [email protected] 2 points 1 day ago (1 children)

In the States the new standard is 240V @ 200 amps, split phase. Most circuits are half of a phase (120V) but there are 240V circuits for load-heavy appliances like stoves and air conditioning. I've heard some people have an extra 240V socket in their kitchens just for tea kettles.

[–] [email protected] 1 points 1 day ago (1 children)

These-phase 400V is the standard house connection here in Europe. Wall sockets are 240V/16A (any phase to neutral), but we also have devices running on three phases, like the oven or the geyser in the kitchen.

[–] [email protected] 1 points 18 hours ago

Do they put a third of the panel on each phase?

[–] [email protected] 155 points 3 days ago* (last edited 3 days ago)
[–] [email protected] 17 points 2 days ago

"this time of year" is 100% christmas.

from people putting up lights, probably trying to run remote power to a box with an extension cord, or because they installed half their lights backward and need this to bridge between the two sets because they rather embrace the danger than redo all the work.

[–] [email protected] 34 points 3 days ago (1 children)

What if I yell "no homo!" when I plug it in?

[–] [email protected] 7 points 2 days ago (1 children)

where are you plugging it in?

[–] [email protected] 5 points 2 days ago (1 children)

I mean, there's only one place for double-headed items to be safely used and it isn't in the workshop.

[–] [email protected] 1 points 1 day ago

...the kitchen?

[–] [email protected] 33 points 3 days ago* (last edited 3 days ago) (1 children)

No idea how and why but my dad once had a cable like that in his workshop.

Short story: we were having a party, bit drunk and wanted power for the bigger speakers, needed an extension, rummaged around and found this one. Of course didn't check the ends, plugged it in and then thought "oh what a weird male adapter there, lets take it...bzzzzt".

Have a tiny burn scar on my hand now, luckily nothing else happened. The cable got dismantled afterwards, but I still don't know why it was there in the first place, he is a pretty good handyman normally.

[–] [email protected] 14 points 3 days ago (1 children)

If you lose power, you can use one of these cables to power your house (or at least, the part of your house on that phase).

This is not how you should do this, but it can work. It is not a good idea (possibly illegal?).

[–] [email protected] 35 points 3 days ago (4 children)

In my jurisdiction, backfeeding your house from a receptacle is very illegal. Transfer switches and interlock kits exist for a reason.

For anyone wondering exactly why it's a bad idea: Power from your generator can, if your house isn't isolated from the grid, travel back into the utility lines and backward through the big transformer at the utility pole (so now it's a few thousand volts again) and give an unsuspecting linesman a nasty surprise. People have died from this. It is a bad idea.

[–] [email protected] 8 points 2 days ago* (last edited 2 days ago)

This is also why solar inverters in most countries MUST be able to 'island' (logically disconnect from grid) in order to run a battery.

We don't have a battery yet, so our inverter shuts down on grid loss. Frustrating as hell when there's an outage on a sunny day, but i get it.

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[–] [email protected] 82 points 3 days ago (15 children)

I have heard there are ways to use these to back feed power from a generator into a house’s system, at least on one breaker, but by definition that bypasses the breaker panel, and the only safe way to use your generator for your house is with a proper cutover installed by an electrician. I can think of literally no other use for one of these cords, except maybe fixing your fuck up if you install Christmas lights backwards.

So yeah, dumb, dumb idea.

[–] [email protected] 57 points 3 days ago* (last edited 3 days ago) (3 children)

This is all reasonably accurate. Source: electrician, who worked at a supply store for a while. I've had people ask how to make all kinds of stupid cords.

If you don't know what you're doing, don't fool with electricity

[–] [email protected] 2 points 1 day ago

Unionized Kobold electricians. Hmm.

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[–] [email protected] 47 points 3 days ago (1 children)

It also backfeeds the grid and can kill someone working on the lines.

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[–] [email protected] 22 points 3 days ago (1 children)

My friend's house does this with their generator. There is a lockout on the breaker, and the main must be off to move it and open the one that feeds the back porch where they tie the generator in. Once the breakers are cycled, they can plug the generator into the outlet on the porch, and it runs there, sheltered from the weather. When the main power is working again, they turn off the generator, remove the cord, disable the breaker, toggle the lockout bar, and turn the main back on. The particular outlet on the porch is useless when using grid power because of this setup.

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[–] [email protected] 13 points 2 days ago

I sell so many of these around Xmas time, I just make them myself with scissors and electric tape.

[–] [email protected] 34 points 3 days ago

My granpa once assigned a master electrician to make an extension cord after he accidently cut the cable of his hedge trimmer. The electrician built him a male2male cord with the female part on the machine. My granpa almost got electrocuted. 🤦‍♂️

[–] [email protected] 10 points 2 days ago (2 children)

Take it down, darwin demands sacrifice, lest we be riddled with stupidity.

[–] [email protected] 9 points 2 days ago (3 children)

Except that sometimes, those idiots could take people down with them. That electrical fire might spread to another house, and the person getting electrocuted might not be the idiot.

[–] [email protected] 11 points 2 days ago

Imagine I'm making the most exasperated, annoyed, disapponted noise possible.

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[–] [email protected] 1 points 1 day ago (1 children)

He didn't take it to the store and tape it to the shelf so it could NOT be there

[–] [email protected] 37 points 3 days ago (2 children)

Sorry, what is "this time of the year"? Suicide September?

[–] [email protected] 47 points 3 days ago (8 children)

People use them to make their generators power their homes, by adding power into an outlet.

So, whatever time of year power outages are likely to happen in this area.

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[–] [email protected] 22 points 3 days ago (4 children)

I'm gonna guess winter, hanging Christmas lights. People string up their lights and then realize far too late that they put two strands with female ends facing each other and instead of restringing they look for a male-to-male cord to bridge the gap.

A little live wire shouldn't stand in the way of holiday cheer, after all.

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[–] [email protected] 41 points 3 days ago (1 children)

It is written in the book of Leviticus: "It shall be unclean for one end of an electric cord to match the other"

[–] [email protected] 32 points 3 days ago (1 children)

Holy shit, this is what that part in the bible is actually about. People back then just didn't know about electricity so they thought it was about gay people.

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[–] [email protected] 18 points 3 days ago (6 children)

What would they even be used for except to short a circuit?

[–] [email protected] 18 points 3 days ago

Some genius won't pay attention to the orientation of a christmas light display while he's putting them up, he'll go to plug them in, and they'll be the wrong way, so he'll want an "adapter."

[–] [email protected] 15 points 3 days ago (1 children)

I will just regurgitate what I've heard. I think they are used in case power goes out and you have a generator. You need to disconnect from the power grid first, but it should then allow you to power tour house with the generator. It sounds more like a US thing.

[–] [email protected] 13 points 3 days ago (2 children)

Yes, this would technically work. Although, it would only power the hot leg the outlet is connected to which only feeds part of the house.

It's very dangerous for a variety of reasons. Especially if you forget to shut off the mains breaker. The transformer can backfeed power down the line at line voltages, creating a shock hazard for lineman or anyone else who might have contact with the line.

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[–] [email protected] 7 points 2 days ago

Connecting this to two plugs on the same circuit won't short anything unless one of the outlets is wired incorrectly.

They're used to backfeed power to your house from a generator during power outages. Technically not legal to use, but most people aren't going to pay $1k for a proper transfer switch. They come with the caveat of 'not to be operated by fuckwits' since you can kill a linesman if you don't flip your main breaker before using them.

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[–] [email protected] 11 points 3 days ago (2 children)
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