Have you ever thought about what will happen to the electrical network if you connect one outlet with a double plug to another outlet? Sounds like some crazy experiment. It is difficult to imagine that something like this would even occur to a person... And yet, for sure, “scientific interest” now torments everyone who has thought about it. Well, let's try to figure it out.
ATTENTION: never, under any circumstances, attempt to connect a socket to a socket by connecting them with a double plug. Attempts to do this can end extremely badly for both the person and the power grid and the entire building! Other consequences include fire and electric shock.
The idea of plugging a socket into a socket sounds like some kind of absurdity, worthy of attention at best within the framework of a popular science show. In fact this is not true. In rare situations, qualified electricians may connect two outlets on the same circuit. This is done as a temporary measure in the process of repair work, if one of the outlets is de-energized. True, this method is used only in cases where there is a reinforced concrete confidence that both the neutral and phase wires of the network are broken. However, in order to "dabble" like this, you need to be an electrician with good experience.
In all other cases, any attempt to connect an outlet to an outlet is an extremely dangerous experiment, reminiscent of Russian roulette not only in terms of the risks that it carries, but also in terms of the list of possible last. Therefore, we will believe again: never, under any circumstances, try to connect two sockets with one wire anywhere!
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Let's start with a little theory. In any outlet there are two wires: zero and phase. If you connect them together, there is short circuit - an emergency in the electrical network, caused by the passage of current along the shortest and most direct path for the sake of depleting its own potential. It ends with an avalanche-like increase in current strength and a strong heating of the electrical circuit. It is for this reason that short circuits often cause fires. And since in most cases a person does not know where the zero is and where the phase is, then an attempt to connect two sockets with one wire with two plugs will end in one of three scenarios:
Option one - the house has a three-phase power supply of 380 V. In this case, a short circuit is guaranteed.
Option two - the phases and zeros of the two sockets did not match when connected to each other. The first phase hit the second zero, and the first zero hit the second phase. In this case, a short circuit occurs.
Option three - the phases and zeros of the two sockets coincided when connected to each other. If the directions of the current coincide, then nothing will happen. The network will continue to work as before.
In conclusion, it remains to be recalled that, at best, a short circuit will knock out the shield and leave the whole house without electricity. In the worst (and most likely) case, a short circuit will cause a fire. In addition, an overloaded network can instantly kill the most unlucky "experimenter".
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Source: https://novate.ru/blogs/210522/63052/