this post was submitted on 26 May 2025
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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.
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
Unionized Kobold electricians. Hmm.
The problem is that people read a few things on the internet, think they're now suddenly domain experts, and do it anyway.
Oh I know.
I've talked to them.
Don't do it. If you haven't actually worked with an electrician for at least two or.three years, just leave the repairs and shit jobs for people like me.
If you can't explain why the white wire is incorrectly called a neutral in single-phase systems, don't touch it.
It also backfeeds the grid and can kill someone working on the lines.
This is the real issue and why you need a modern transfer switch. Lineman is working on the transformer on the pole, "it's fine we cut it off upstream and I checked" and BOOM anyway
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.
So if it's only for the generator, why is it wired as an outlet, not an inlet?
I've heard the Christmas lights one before too, but I never got it. How do (American) Christmas lights work that you'd need one of these cords?
In North America, Christmas lights usually have a plug end and a socket end so you can connect multiple strings together in series.
If you accidentally put the plug end at the top of the tree, it might be tempting to try to buy or make one of these cords so you don't have to take the lights down and redo them.
It is as dumb and lazy as it sounds.
So if I understand it correctly, if you were to use this "solution", you'd leave live exposed prongs on one end of the lights, right?
Cause that would make it even dumber than I had imagined lmao
Yup. American Christmas lights basically ARE very thin extension cords with the bulbs (hopefully) wired in parallel. Back in the day they were pretty much all incandescent and in series, and a single burned out bulb meant everything went out and Junior got a joyous new holiday chore!
Yep. Exactly right.
There are voltage converters (230V<->120V) that have female connectors in both ends. So if DIY guys are playing with tech from other continents.
Any serious DIY person can just splice an extra male plug onto a cord faster than driving to the store and reading this sign.
I don't understand why it would have female on both ends?
Yeah. Makes no fucking sense
I searched that model number, and came up with a similar looking box that has a corded male end- implying that those two stickers are outputs.
https://en.uraltone.com/uraltone-suomi-usa-muuntaja-230v-115v-600va-maadoitettu-metallikotelossa-1.html
Weird use case. Never underestimate the customer.