Why do electrical plugs make an additional hole

  • May 28, 2021
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Almost everyone paid attention to the presence of an additional hole in the plug. But most likely, most people have no idea why this hole is needed and what role it plays. Moreover, in standard domestic-made plugs there is no element made for it. This is actually quite a practical hole.
Almost everyone paid attention to the presence of an additional hole in the plug. But most likely, most people have no idea why this hole is needed and what role it plays. Moreover, in standard domestic-made plugs there is no element made for it. This is actually quite a practical hole.
Almost everyone paid attention to the presence of an additional hole in the plug. But most likely, most people have no idea why this hole is needed and what role it plays. Moreover, in standard domestic-made plugs there is no element made for it. This is actually quite a practical hole.

Good to know...

The standard outlet has special contacts on the sides to prevent electric shock. / Photo: gipso.yarfotograf.ru
The standard outlet has special contacts on the sides to prevent electric shock. / Photo: gipso.yarfotograf.ru
The standard outlet has special contacts on the sides to prevent electric shock. / Photo: gipso.yarfotograf.ru

First of all, if you take a closer look at the outlet, you can see not only two standard holes where the plug from an electrical appliance is inserted, but also the contacts. They are designed to connect to a three-prong plug that is also grounded. This protects the user from possible electric shock. This contact prevents the occurrence of dangerous voltage on the surface of a device with which a person interacts.

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By the way, these plugs are installed not only on products with a metal case, but also on those with a surface made of plastic. This approach makes the use of instruments safer.

The plastic case is made in household appliances for security purposes / Photo: ugra.ru
The plastic case is made in household appliances for security purposes / Photo: ugra.ru

The same contacts on the socket and plug help to reduce electromagnetic interference during the operation of electrical appliances. The fact is that some electrical products have higher electromagnetic radiation. Instruments during operation will not be completely safe without these grounding contacts.

What is the additional hole on the plug for?

Euro plugs are used in Europe, under them there are special sockets with a pin that acts as a grounding / Photo: elsi.by
Euro plugs are used in Europe, under them there are special sockets with a pin that acts as a grounding / Photo: elsi.by

Plugs with one more hole are called European. They are used in Europe. As a rule, they are found in household appliances of foreign manufacturers or in domestic ones, but intended for export. Euro sockets have a special pin (ground) that connects to this hole.

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It will not be possible to connect the device to such a European socket without a special hole / Photo: gipso.yarfotograf.ru

These structures were created for safety reasons, so that a person could not insert a plug that does not have a grounding into the outlet (without a hole, it will not work to connect an electrical appliance). The plug plays a role similar to our side contacts.

Low voltage products with a plastic case (the material is an excellent dielectric) may not have grounding plugs. They are not very dangerous.

It will be useful to know why the socket is falling out of the wall, and how to fix the situation.
A source: https://novate.ru/blogs/250121/57583/

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