What is the use of laying some metal that is not connected to the grounding body on the outside of t

Grounding device refers to the general term for the grounding electrode buried in the ground and the connecting wire from the grounding electrode to the equipment.

The ground resistance should be less than 100 ohms.

Natural grounding body: metal pipes, metal structures and reinforced concrete foundations directly buried in the ground or water.

Artificial grounding body: It is composed of a metal grounding body (angle steel, flat steel, steel pipe, etc.) buried in the soil and a grounding wire for connection.

The grounding device includes a grounding body and a grounding lead, and the grounding body refers to the facility that is connected with the earth, because of the needs of this function, it is required that the resistance between it and the earth is small, and the buried depth and the contact surface are large to meet this requirement.

A grounding lead is a conductor that connects the above facilities to the desired grounding part.

Natural grounding body refers to the natural objects or structures that can be used as grounding bodies by natural or man-made buildings, natural objects are very rare, and structures are more common, such as building pile foundations, ground beams, steel bars in deep wells, etc. It is evident that the natural grounding body is a grounding body that utilizes the nature.

The artificial grounding body is a grounding body specially set up for grounding, such as angle steel, round steel, steel pipe, etc. (rebar cannot be used), buried grounding module, etc., it is obvious that the artificial grounding body is a special grounding body.

Summary. Structural size refers to the main term of architectural drawing, which refers to the size between the center lines of beams, columns, and walls, that is, if you want to look at the structural dimensions between two columns, for example: is it a column of 60 cm by 60 cm, or a column of 80 cm by 80 cm; Then 60 cm multiplied by 60 cm column looks at the size of the center as 30 cm.

What are the grounding wires, metal connectors and grounding bodies mainly made of?

What are the requirements for the size of the structure.

Dear, hello, I am happy to answer for you, grounding down wire, metal connectors and grounding bodies are mainly composed of metal connectors and fasteners and supports. The middle part of the supporting piece is fixed on the main structure, and the ends of each limb and the screw rod of the fastener are connected together; The end of the fastener is sleeved in the round hole at the corner of the glass plate, which plays the role of fixing the glass plate.

Structural size: The structural size should not be less than the diameter of the round bar, the diameter of the flat bar is 10mm, the flat bar is 25mm, the angle steel is 45mm, the 45mm is 4mm, the wall thickness of the steel pipe is 35mm, the diameter is 50mm, and the steel grounding body should be made of hot-dip galvanized material.

Structural size refers to the main term of architectural drawing, which refers to the size between the center lines of beams, columns, and walls, that is, if you want to look at the structural dimensions between two columns, for example: is it a column of 60 cm by 60 cm, or a column of 80 cm by 80 cm; Then 60 cm multiplied by 60 cm column looks at the size of the center as 30 cm.

Answer]: a, c

This question examines the technical requirements for the construction of lightning protection and grounding devices. Natural grounding body: (1) using the steel bar of the building floor as a horizontal grounding body; (2) The use of engineering pile reinforcement to make a vertical ground body.

The grounding device consists of a grounding body and a grounding wire. The metal conductor buried in the ground and directly in contact with the earth is called the grounding body, the metal conductor that must be grounded in the electrical device and the grounding body is called the grounding wire, and the whole composed of a plurality of grounding bodies connected with conductors in the earth is called the grounding network. The grounding body is the Guin's source code genus buried in the soil, such as steel pipes, angle steel, flat steel, etc., which is about meters long.

The grounding body can be buried horizontally or vertically. When buried horizontally, flat steel is generally used to make the grounding body, and the buried depth should not be less than meters. When buried vertically, steel pipes and angle steels with a wall thickness of about millimeters or more are generally used.

Use a flat steel welded on the grounding body as the lead-out conductor, and weld a crack bolt on the lead-out conductor to connect with the grounding wire. The grounding wire is generally insulated copper wire and bare copper wire. The minimum cross-sectional area of the grounding wire is:

Insulated copper wire is 4 square millimeters, and bare copper wire is 4 square millimeters.

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The grounding device is composed of a grounding connection wire and a grounding body.

Grounding device, also known as grounding integrated device: a device that forms an electrical connection between electrical equipment or other objects and ground. (Building Electrical Construction Technology).

The grounding device is composed of a grounding electrode (plate), a grounding bus (indoor and outdoor), a grounding down conductor (grounding jumper), and a frame grounding. It is used to connect the electrical system to the earth. A metal object that is in direct contact with the ground to achieve an electrical connection is the grounding electrode.

It can be an artificial grounding electrode or a natural grounding electrode. The grounding electrode can be given some electrical function, e.g. for system grounding, protective grounding or signal grounding. The grounding busbar is the reference potential point of the electrical installation of the building, through which the part of the electrical installation that needs to be grounded is connected to the grounding electrode.

It also serves another purpose, that is, by connecting the equipotential bonding lines in the electrical installation, so as to realize the total equipotential bonding between the large conductive parts of a building. The connecting wire between the grounding electrode and the grounding busbar is called the grounding lead.

Answer]: A grounding device is used to protect people and equipment safety air pickpocketing, which can be divided into four types: protective grounding, bucket game grounding, lightning protection grounding and anti-static grounding. Such as.