Some intuitively can see some phenomena, such as voltmeter or ammeter deflection, light bulbs, etc.; some may need measurement equipment to know if it is working. According to the nature of the current flowing, it is generally divided into two types. The circuit through which DC power passes is called a "DC circuit", and the circuit through which AC power passes is called an "AC circuit." In the housing renovation, circuit installation is indispensable. Then the owners who first renovated the house know how to install the household circuit? Today I will tell you how to install the circuit .
What is a circuit
The circuit through which current flows is called a circuit, also called a conductive circuit. The simplest circuit is composed of power supply, electrical (load), wire, switch and other components. When the circuit is turned on, it is called a path. When it is disconnected, it is called an open circuit. Only the path, the current through the circuit. A disconnection of a circuit is called an open circuit or an open circuit. If there is no load between the positive and negative poles of the power supply in the circuit, and the direct connection is called a short circuit, this is absolutely not allowed. Another kind of short-circuit means that the two ends of a component are directly connected. At this moment, the current flows from the directly connected place and does not pass through the component. This condition is called short circuit of the component. Open circuit (or open circuit) is allowed, and the first type of short circuit is not allowed, because the short circuit of the power supply will cause the power supply to burn out, and the short circuit with the electrical appliance will cause the normal operation of the appliance and the meter.
Circuit composition
The circuit is composed of four parts: power supply, switch, connecting wire and electrical appliance. Practical applications of the circuit are more complex, therefore, in order to facilitate the analysis of the essence of the circuit, the actual components of the circuit and its connection lines are usually symbolically represented, that is, drawn into a so-called circuit diagram. The wire and auxiliary equipment are collectively referred to as intermediate links.
The power supply is a device that provides electrical energy. The function of the power supply is to convert non-electrical energy into electrical energy. For example, batteries convert chemical energy into electricity; generators convert mechanical energy into electricity. Because there are many types of non-electrical energy, there are many ways to convert it into electrical energy. The power supply is divided into two types: voltage source and current source. Only the equal-sized voltage source is allowed to be connected in parallel, and only the same size current source is allowed to be connected in series. The voltage source cannot be short-circuited and the current source cannot be disconnected.
The various devices that use electrical energy in the circuit are collectively referred to as loads. The function of the load is to convert electrical energy into other forms of energy. For example, electric furnaces convert electrical energy into thermal energy; motors convert electrical energy into mechanical energy, and so on. The commonly used lighting fixtures, household appliances, machine tools, etc. can be called loads.
The connecting wires are used to connect the power supply, loads and other auxiliary equipment into a closed loop, which plays a role in transmitting electrical energy.
Auxiliary equipment
Auxiliary equipment is used to achieve the role of control, distribution, protection and measurement of the circuit. Auxiliary equipment includes various switches, fuses, ammeters, voltmeters and measuring instruments.
Circuit installation method
First, positioning
First of all, according to your use of the circuit for electrical purposes, for example, where to switch, where there are sockets, where to light and other requirements, the electrician will be positioned according to your requirements.
1, the basis for determining the point: According to the home wiring design scheme, combined with the point diagram on the wall, use the pencil, level ruler or ink fountain to mark the position of the cassette at each position.
2, the cassette height is determined: In addition to special requirements, the height of the cassette is consistent with the original strong electric socket, the height of the background music tuning switch should be consistent with the height of the original strong electric switch.
Second, slotting
1, determine the slot route: According to the following principles:
1 The principle of the shortest route;
2 Do not destroy the original principle of strong electricity;
3 Do not break the waterproof principle.
2, determine the slot width: According to the number of signal lines to determine the number of PVC pipe, and then determine the width of the slot.
3. Determine the groove depth: If a 16mm PVC tube is selected, the groove depth is 20mm; if a 20mm PVC tube is selected, the groove depth is 25mm.
4. Appearance requirements of the trough: horizontal and vertical, uniform in size, the wall surface shall not exceed 30m2.
5, the measurement of trunking: cassette, slot independent calculation, all slots from the beginning of the slot to the end of the slot measurement, the slot width if more than two tubes, the length should be calculated more than twice.
Third, the wiring
1, to determine the smoothness of the cable:
1 Test of network cable and telephone line: Test and disconnect with a network tester respectively;
2 Test of cable TV lines, audio and video cables, and audio cables: test and disconnect each other with a multimeter;
3 other cables: use appropriate professional instrument test continuity.
2, to determine the line length of each point:
1 Measure the length of the wiring box slot to each point end;
2 Add the length of redundant lines at each point and at the wiring box slot: The length of the outlet line at each point is 200mm - 300mm.
3, to determine the label: the various types of cables cut to a certain length after the two ends of the line labeled, and indicate: weak type - room - serial number. 4. Determine the number of pipe lines: The cross-sectional area of ​​the pipe line must not exceed 80% of the pipe's cross-sectional area.
Fourth, elbow
The elbow should use the elbow tool. The radian should be 10 times the diameter of the pipe, so that the thread can be removed or disconnected.
Fifth, sealing slot
1. Fixed cassette: In addition to the kitchen and bathroom cassettes protruding from the wall 20mm, other cassettes are required to be flush with the wall surface. Several cassettes are required to be on the same level.
2, fixed PVC pipe:
1 Ground PVC pipes must be fixed at intervals of one meter. No nails or wedges should be used in the original reserved pipeline area.
Two-slot PVC pipes are required to be fixed at intervals of two meters. No nails or wedges should be used in the original reserved pipeline area.
3 Wall grooved PVC pipes must be fixed at intervals of one meter.
3. Sealing groove: The wall surface and ground surface after sealing the groove shall not be higher than the plane.
4. Clean the construction site: After the sealing tank is closed, remove the garbage and clean the construction site.
Editor's summary: The above is the introduction of household electrical circuit installations that need to be cautious to ensure the safety of household electricity. Hopefully, this will help friends who have this need! For more information, please continue to pay attention to our website, follow-up will show more exciting content.
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