JP5258454B2 - Grounding system - Google Patents

Description

  The present invention relates to a grounding system for a building having a reinforced concrete foundation.

In order to protect electrical equipment from overvoltage such as lightning surge voltage and to protect human body from electric leakage and electric shock, there are electrical equipment that requires ground wiring. A connecting ground line is provided. However, since recent electronic devices such as communication devices are vulnerable to surge voltage and static electricity, a configuration that can ground the electric device more efficiently and with good quality is desired.
From such a background, in a building having a reinforcing bar structure foundation, a grounding form using the reinforcing bar used in the building is studied. The structure which connects to the built-in lightning arrester and connects the grounding wire of this lightning arrester to the reinforcing bar of a concrete foundation is disclosed.

In the case of a reinforced concrete foundation, a large electrostatic pole is generated between the ground and the ground by the wide grounding poles, and the resistance value between the ground and the ground can be reduced. Therefore, it is possible to handle the reinforced concrete foundation as a grounding electrode by using this, and in Patent Document 1, simply connecting the grounding terminal to the reinforcing bar makes the grounding terminal in a grounded state. The effect of lightning voltage can be reduced without grounding work.
Moreover, since the potential gradient in the building can be reduced by using the building foundation as a ground electrode in this way, it has become possible to improve the function of protecting electrical equipment and protecting the human body from electric leakage and electric shock.

JP 2006-288126 A

  However, although the technology of Patent Document 1 described above can reduce the influence of lightning voltage, it is necessary to determine the installation location of electrical equipment that requires grounding at the time of housing construction, and installation of electrical equipment that requires grounding after housing construction When changing the location or adding electrical equipment, there were cases where restrictions were imposed or separate grounding work was required.

  Therefore, in view of such problems, the present invention provides a grounding system that can easily perform grounding even if the number of electrical equipment that requires grounding is increased while maintaining the protection function of electrical equipment due to overvoltage such as lightning. For the purpose.

In order to solve the above-mentioned problem, the invention of claim 1 is provided with a plurality of grounding boxes provided with ground terminals for connecting ground wires of electrical equipment at appropriate positions on the wall surface or floor in the building, individual said ground terminal is connected to the reinforcing steel which constitutes the building foundation made of reinforced concrete, to allow grounding of electrical equipment ground wire arranged electrical equipment in a building by connecting to the ground terminal, the ground The box body is an outlet box attached to the wall surface with a power outlet in addition to the ground terminal, and a plurality of the ground terminals of the ground box are electrically connected to each other through a reinforcing bar. The reinforcing bar is connected to a main grounding box for connecting a main grounding line constructed outdoors .
.
According to this configuration, a grounding state can be obtained without using a grounding rod by connecting a grounding wire from an electrical device or a lightning arrester in a building to the grounding terminal of a nearby grounding box. Since the grounding boxes are arranged at a plurality of locations, it is possible to easily cope with the movement and addition of electrical equipment, and no new grounding work is required. Furthermore, since the entire building foundation is grounded, equipotential bonding grounding can be achieved, and even if an abnormal voltage such as a lightning surge enters, the electrical equipment can be prevented from being damaged or receiving an electric shock.
In addition, the main grounding box can be used to further ground the building foundation rebar, allowing for a good grounding condition, and one main grounding can be used for electrical equipment in any location. Even if a rod is placed, the grounding cost can be reduced .

Furthermore, since a dedicated box is not required as a grounding box, it can be constructed at a low cost, and since a power outlet is provided, there is no need to separate the ground wire and the power cord of the electrical equipment, which is convenient.

According to the present invention, it is possible to establish a grounded state without using a grounding rod by connecting a grounding wire from an electrical device or a lightning arrester in a building to the grounding terminal of the grounding box. And since the grounding boxes are arranged at a plurality of locations, it is possible to easily cope with the movement and expansion of electrical equipment, and no new grounding work is required. Furthermore, since the entire building foundation is grounded, equipotential bonding grounding can be achieved, and even if an abnormal voltage such as a lightning surge enters, the electrical equipment can be prevented from being damaged or receiving an electric shock.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a grounding system according to the present invention, and is an explanatory diagram of a grounding structure of a detached house having a reinforced concrete foundation. In FIG. 1, reference numeral 1 denotes a reinforced concrete structure portion including a reinforced concrete foundation 1a, 2 denotes a reinforcing bar in the structure portion, 3 denotes a ground box (grounding box) for grounding an electric device, 4 denotes a distribution board, 5 Is a lead-in line for drawing in commercial power, 6 is an electrical device, and 7 is a main grounding box for introducing a main grounding wire 8 subjected to main grounding into the building.

  The grounding box 3 has a grounding terminal 3a inside, and, like a well-known outlet box, it is embedded in the floor or wall surface of the building having the reinforced concrete foundation 1a so that only the front surface is exposed and installed at an appropriate position. Has been. The grounding terminal 3a is connected to the reinforcing bar 2 by the grounding wire 10 when the reinforcing bar is laid in the wall surface or the floor surface, and can connect the grounding wire 9 of the electric device 6 introduced from the front.

In addition, the reinforced individual reinforcing bars 2 are electrically connected to each other, and the ground terminals 3a of all installed grounding boxes 3 are connected to each other via the reinforcing bars 2 and are used for main grounding that is constructed outdoors. Connected to box 7. The grounding terminal 7a of the main grounding box 7 is connected to a main grounding wire 8 that is grounded with a grounding rod (not shown) and is grounded in D type.
The grounding box 3 electrically connected to the reinforcing bar 2 is connected to the ground wire 9 of each electrical device 6 and the ground wire 9 of a lightning arrester (not shown) in the distribution board 4. Reference numeral 12 denotes a power supply line for supplying power to the electrical device 6.

  Thus, by providing the grounding box 3 using the reinforcing bar 2, when an abnormal voltage such as a lightning surge occurs, the electrical device 6 is protected as follows. Since the reinforcing bars 2 to which the grounding box 3 is connected are disposed on the entire foundation of the building, they are electrostatically coupled to the ground and become in a low resistance state like a state where a grounding rod is placed. Therefore, a surge voltage (surge current) such as lightning can be effectively passed to the ground, and an abnormal voltage entering from the lead-in wire 5 or the like is absorbed, so that the abnormal voltage applied to the electrical device 6 is reduced.

In this way, it is possible to establish a grounded state simply by connecting a grounding wire such as an electric device or a lightning arrester in the building to the grounding terminal of the grounding box. Since the grounding boxes are arranged at a plurality of locations, the grounding boxes can be easily grounded using a nearby grounding box for the movement or addition of the electric equipment, and no new grounding work is required. Furthermore, since the entire building foundation is grounded, equipotential bonding grounding can be achieved, and even if an abnormal voltage such as a lightning surge enters, the electrical equipment can be prevented from being damaged or receiving an electric shock.
In addition, by connecting the main grounding wire to the reinforcing bar, the reinforcing bar of the building foundation is further grounded, so that a good grounding state can be achieved, and one main grounding is performed at an arbitrary place, and the nearby base By connecting to a reinforcing bar, it can be applied to electrical equipment placed at any location, and even if a grounding rod is placed, the grounding cost can be reduced.

  Although the main grounding is performed by placing a grounding rod, this is done in order to reliably reduce the grounding resistance value. There is no case where the resistance between the reinforced concrete foundation 1a and the ground is below a predetermined value. May be.

  FIG. 2 shows an example in which the grounding system of the present invention is applied to an apartment house. The same components as those in FIG. 1 are given the same reference numerals. In this way, if it is a reinforced steel structure, it can be applied to large-scale buildings such as apartment buildings. A good grounding state can be obtained.

  In each of the above embodiments, the grounding of the electrical device 6 is performed using the dedicated grounding box 3, but a grounding terminal is provided inside using a well-known outlet box, and this grounding terminal is connected to the grounding terminal. You may connect to the reinforcing bar 2. In this case, if a power outlet is provided in the outlet box, there is no need to separate the ground wire and the power cord of the electric device, which is convenient.

It is explanatory drawing of the grounding structure of a detached house which shows an example of embodiment of the grounding system which concerns on this invention. It is another example of a grounding system and is an explanatory diagram of the grounding structure of an apartment house.

Explanation of symbols

  1. Reinforced concrete structural part, 1a. Reinforced concrete foundation 2. Reinforcing bar 3. Ground box (grounding box) 6. Electric equipment 8. Main ground wire 9. Ground wire

Claims (1)

A plurality of grounding boxes having ground terminals for connecting the ground wires of electrical equipment are installed at appropriate positions on the wall surface or floor in the building, and each of the ground terminals constitutes a building foundation made of reinforced concrete. To connect to the ground terminal of the electrical equipment arranged in the building to the ground terminal ,
In addition to the ground terminal, the ground box is an outlet box attached to a wall surface with a power outlet, and the ground terminals of the plurality of ground boxes are electrically connected to each other via a reinforcing bar. Connected to
The grounding system is characterized in that the reinforcing bar is connected to a main grounding box for connecting a main grounding wire to be constructed outdoors .

Images