Detailed analysis of primary, secondary and tertiary distribution boxes?

What are primary, secondary and tertiary distribution boxes?

Temporary power consumption refers to the construction needs of a certain place, and the primary distribution box introduces three-phase power supply, grounding wire and zero wire from the transformer.

Secondary distribution box; That is, from the power line of the main distribution box to the temporary power consumption,

Three-level distribution box; Is the control cabinet of the electrical equipment itself. Click here to download the construction technical data for free.

First-class distribution box: the construction power distribution box is used in the construction of the construction site, specially designed for the special situation of the construction site, and meets the relevant construction power standards of the construction department. The complete set of products can form a complete three-level protection system for construction electricity, achieving the purpose of one machine, one brake and one protection, which is very suitable for all kinds of standard projects. The first-class cabinets are connected by copper bars and have a metering system inside. Safe and beautiful, and the rain-proof box top is suitable for field work.

Three-level distribution: there is a distribution box under the main distribution box, a switch box under the distribution box and electrical equipment under the switch box, forming three-level distribution. "Two-level protection" mainly refers to the use of leakage protection measures. In addition to installing the leakage protector in the final switch box, it is also necessary to install the first-level leakage protector in the superior distribution box or the general distribution box to form two-level protection as a whole. The principle of "one machine, one brake, one leakage, one box and one lock" means that the same switch appliance is prohibited from directly controlling two or more electrical equipment (including sockets).

Secondary distribution box:

Suitable for the construction of construction sites. Specially designed for the special situation of engineering construction site, in line with the relevant construction electricity standards of the Ministry of Construction. A complete set of products can form a complete three-level protection system for construction electricity, and achieve the purpose of one machine, one brake and one protection. The auxiliary box adopts the design of inner and outer doors, and the exterior is sprayed with plastic, which is safe and beautiful. The rain-proof box top is suitable for field work.

The secondary distribution box should be placed at 1.5M above the ground.

Main switch 60a-DZ47-63 100a

Lighting switch16a-dz47-6316a two-phase leakage switch

Air conditioner 1.5p-20a-DZ47-6320a two-phase leakage switch

Electric water heater 8000W+ washing machine -DZ47-6360A two-phase leakage switch (because there is no 40A switch, only 32A)

Socket switch 65438+16a-dz47-6316a+06a

The main electrical appliances are refrigerators, induction cookers and microwave ovens. The air conditioning switch needs to be replaced, and so does the main switch.

The main switch does not need leakage. Branch switch with leakage protection is the best. Because it is fatal for a human body to pass 30mA. The working current of the leakage switch is 15-30mA.

At present, the distribution lines in cities are generally 4 square meters, and some have already used 6 square meters. It's better to replace the 2.5 square one.

Engineering drawing of security technology prevention system

In order to improve the engineering quality of security system, it is necessary to draw the engineering drawing of security system.

The design and drawing of engineering drawings must closely cooperate with related disciplines, and reserve power supply capacity and pipelines to ensure smooth threading and system debugging in the future.

Engineering drawings should be drawn carefully, and all graphics and symbols must conform to the provisions of General Graphical Symbols for Security Systems promulgated by bu and the Standards for Graphics and Symbols for Communication Engineering Design of Industrial Enterprises. The insufficient part should be supplemented. Drawings should be clear and tidy, with regular fonts. In principle, it is required to write Song typeface to simplify drawings and facilitate construction. Express the design intention in detail, not cumbersome.

Drawing drawings requires a clear priority, and the laying of lines should be emphasized. Electrical components and equipment are solid lines, and the outline of the building is thin solid lines. All main rooms on the building plane should be marked with the room name and spindle number.

All relevant prevention areas should be clearly marked according to the plan, so as to check whether the prevention methods and areas meet the design requirements, and the positions of detectors and cameras should be as accurate as possible. Equipment installed on the wall or ceiling shall be marked with the height (i.e. elevation) from the ground. The same plane, the same prevention requirements, can only draw a layer or unit layer plane, when the local is different, the local plan should be drawn according to the axis.

Provisions on scale: 1: 100 should be adopted when drawing various equipment on the floor plan and the quantity is large.

But the area is very large and the equipment is very few. If you can express it clearly, you can use 1: 200.

If the configuration file is complicated, you should use 1: 20, 1: 30 or even 1: 5. Depend on that scale clarity of a small part.

The description of construction drawing design strives for concise language and clear expression. What is clearly shown on the floor plan need not be repeated in the description. All situations that are not indicated in the construction drawing or belong to * * * and are not clearly indicated in the drawing need to be supplemented. For example, the prevention area and angle of space prevention. Individual items can be listed in the lower right corner and the upper right corner of the home page drawing. If there are multiple sub-items in a system, which is a unity problem, a general description should be compiled and arranged on the front page of the drawing.

Descriptions are generally arranged in the following order:

Selection, function and installation of front-end equipment such as detectors and cameras;

Function, capacity, characteristics and installation of central control equipment such as alarm controller and video matrix switching host;

Requirements and practice of pipeline laying and grounding. Outdoor pipeline laying, cable laying methods, etc.

Provisions of design drawings

(1) master plan of prevention system

Mark the position of the prevention system in the general plan of the building, and mark the monitoring range, the position of the control room, the direction of transmission lines, the grounding of the system, etc.

(2) System diagram

Determine the relationship between the equipment and materials to complete the security task, and determine the performance, quantity and installation location of detectors, cameras and central control equipment.

Determine the function and capacity of alarm controller and video switching controller.

Determine the model, quantity, performance and technical indicators of all major equipment to meet the ordering requirements.

(3) floor plan of each floor and each district

Determine the installation positions of detectors and cameras, mark labels, and determine the direction of transmission lines and the number of pipelines and pipes.

Method and elevation of line burying. If possible, draw the detection area or range of the detector and camera.

(4) List of main equipment and materials

(5) General situation of complex parts installation

Three-level distribution refers to the main distribution box, distribution box and switch box. Two-level protection means: the main distribution box and switch box are equipped with leakage protection.

Three-level power distribution means that the site construction electricity must be equipped with three types of standard electrical boxes: main distribution box, sub-distribution box and switch box.

Three-level protection means that leakage protectors must be installed in the main distribution box, distribution box and switch box during site construction.

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