Why are there two small holes in the power plug?

In fact, with the current process, any shape can be used. The reason for the two holes is that one hole cannot form a loop (one hole can be made after the process is improved), and there is no need for a third hole with a neutral line.

A lot of plugs have two small holes, do you know why.

Why are there two small holes in the plug? After listening to the old electrician, I realized that the child at home always played with the plug with such a powerful effect, worried that he would be electrified? Find this mechanism, play for as long as you want, the small hole in the plug, is clamped by the spring, it is not easy to fall, wear it with a rope, and prevent the child from getting electricity.

Exhausted, it is not easy to suffocate.

Hey, why are there three in my family?

I don't understand what you mean, please say it again, okay?

I believe that everyone is familiar with the plug, and it is used everywhere in home life However, we will find that there will be two small holes in the existing plug, what is the small hole in the plug for?

What are the two small holes in the plug for? After reading it, I realized that the function is so powerful!

These two small holes not only come with a metal lock to prevent children from being electrocuted, but also can buckle the contact and the metal sheet together, it is not easy to loosen, these two small holes have brought great convenience to our lives.

The two small holes in the plug are designed to prevent the plug from falling off after being inserted into the socket.

The purpose of these two small holes is to make the power supply more stable and play the role of fixing the plug. The two small holes can be closed to the protruding part of the inside of the socket, so that the plug is fixed, and the power supply becomes better and more stable.

If the elasticity of the copper sheet decreases, it will cause the plug to loosen, poor contact or even fall off. So two round holes were designed on the plug and two protrusions were designed on the copper sheet. After the plug is inserted, the protrusion on the copper sheet is just stuck into the round hole on the plug, which increases the stability of the plug.

If you live in the United States, Squire will almost certainly be familiar with the holes in the prongs of electrical plugs. Many, if not most, American plugs have them. So what exactly are they for?

The answer dates back to the early 20th century, when Harvey Hubbell JrPatents were filed for a number of electric plugs (starting with the first detachable electric plug in 1904). Some of Hubbell's designs feature dented prongs that align with the small bumps inside the power outlet.

When you plug the return head into the receptacle, the bump system helps hold the prongs in place. The indentation eventually gives way to holes, which, according to HowstuffWorks, serve the same purpose.

But that's only part of the story. As various YouTubers have demonstrated, modern outlets usually no longer have bumps – they use friction and pressure to prevent the plug from falling off the wall. Today, these holes have other uses.

Warning messages can also be passed through the hole, effectively ensuring that the consumer sees the warning before using the additional device. Manufacturers can even secure a small lock or zipper through one or two holes as a means of factory sealing. Another popular theory is that these holes save metal, which helps reduce costs over time.

According to official regulations established by the American National Standards Institute (ANSI) and the National Electrical Manufacturers Association (NEMA), the holes are "optional" and "for manufacturing purposes only." However, if you want to thread a small padlock through the plug hole to prevent your child from powering certain devices, NEMA probably won't mind.

Because the metal contacts of many plugs are relatively thin, the contacts are clamped by two elastic metal pieces after inserting the jack, but they are easy to loosen. With the addition of these two holes, the metal contacts can be snapped together with the protrusions on the metal sheet, making it difficult for the plug to fall off. Some newer electrical appliances have no small holes in the contacts of the two-pin plugs, because they increase the thickness of the contacts, which aggravates the deformation of the metal sheet in the jack, and can also achieve the effect of increasing the friction in the jack.

As for the three-pin plug, it has the unique stability of the triangle, so there is no need to worry about it falling off the socket easily.

If the plug is not stable, you can use two holes to get stuck, I don't know if the understanding is correct.

We will find that many of the charger plugs that we use every day have two small holes in them, but many people don't know what it's used for, but it has a lot of functions.

1. Prevent falling off

The two small holes on the top of the power plug thought it was just decoration and had nothing else to do, but it was only later that I learned that there were actually many doorways inside. It effectively separates the jack out of a few, for people who often forget the time, a plug, you don't have to turn on the light at night, and it is also very convenient when you use it. Because the metal contacts of the plug are relatively thin, the contacts are easy to loosen after entering the hole, and the plug without punching holes will affect the normal use of household appliances if it falls offThis is very good in protecting people.

2. Prevent accidents

There is also this hole is not overcharged because you forget to unplug it, you can charge it regularly, it is very convenient to be small, very practical, the automatic charging timing is very punctual with it, don't deliberately get up and unplug it at night to charge the mobile phone, and the automatic power-off can also help you save energy, it is really a very good thing, electric car charging with this is also great! There is also a very strange effect, that is, the plug can be locked, many parents are worried that their children will not study when they play on the computer, and parents can lock the plug with a lock, so there is no way to playSo as to avoid naughty children playing with electricity accidents.

Therefore, it is still necessary to understand the small details that seem inconspicuous in lifeBecause you'll find that little things can make a big difference.

Prevent the plug from falling off. A variety of functions, effectively separating the jack out of a few, is not without effect.

With these two small holes, the metal bulge can be snapped together with the bulge on the metal sheet, so that the sub-plug is not easy to fall off.

The two holes are small, but they are very useful, and without these two small holes, there is a high chance of loosening.

When the plug with holes is plugged into the socket, it cannot be inserted without force, which can well reduce the occurrence of electric shock in children.

It's all the old plugs, but now it's rare.

In the past, I bought a charging head or a small ceiling fan, which had two holes in it. The previous socket is also slightly different from the current one, the previous socket and the plug correspond to a little protrusion, which should be fixed, of course, the copper sheet usually used in the socket is very thin, otherwise it is not easy to make those two protrusions. Now that I don't have it, I think it's because the quality of the plug and socket is better than before, and it can be tightly fixed just by friction.

I remember that there was a dark red socket at home in the past, the quality was very good, there was no protrusion, the copper sheets on both sides were very thick and were resisted by two rows of springs, and now it is rare to see such a good socket in the general household.

If you talk about the advantages, saving materials is one of them. After all, the proportion of two holes accounting for the two claws of the plug is not small, and the plug and socket are mainly in contact with the conductive part of the plug a little closer to the plug.

This can reduce the occurrence of electric shock in children. It's not useless

After you asked, I took out my charger and looked at it, but there was no hole as you said.

I don't know, I didn't find the two small holes you said are in**, there shouldn't be any.

This type of plug was first used in the lives of Japanese people. Therefore, generally imported electrical appliances will have these two small holes.