>>> Links: Family homes need to go five routes In power systems, voltages below 36V are called safe voltages, voltages below 1kv are called low voltages, voltages above 1kv are called high voltages, and lines that directly supply power to users are called distribution lines, such as user voltages are 380/220v, It is called a low-voltage distribution line, which is the strong electricity in home decoration (because it is the highest voltage for home use). Strong electric generally refers to AC voltages above 24V. Such as home lights, sockets, etc., voltage 110V ~ 220V. Household electrical lighting, electric water heaters, heaters, refrigerators, televisions, air conditioners, audio equipment and other electrical appliances are strong electrical equipment. Hydropower renovation switch socket electrical TV decoration paint floor tiles
LSAW pipe mill, also known as JCOE steel pipe, it has one welding seam and
uses the submerged arc welding process. The specification range is from 325mm
to 1420mm. When the diameter of the straight seam submerged arc welding pipe is
greater than 914.4 mm, the standard stipulates that steel pipes is allowed to
have two straight welding seams.
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The intelligent system is a comprehensive system composed of a monitoring system for construction equipment, a security system, a communication network system, an information network system, an automatic fire alarm system, and a fire fighting linkage system. The system consists of a centralized monitoring, control, and management system. The lines of control, network systems, etc., control, management, and communication are called intelligent lines (that is, weak electricity in home improvement). Weak current generally refers to the DC circuit or audio, video lines, network lines, telephone lines, DC voltage is generally within 24V. Household electrical appliances such as telephones, computers, and televisions, which use signal input (cable television lines) and audio equipment (output lines), are all weak electrical devices.
What are the steps of electrical installation?
Design, construction, material selection, line positioning, chisel wall trench, cloth tube burying box, pipe threading, electrical equipment installation, measurement inspection.
What is the hidden installation of electrical installation?
Laid in the brick wall, concrete floor, beam, column, floor, and roof; the concealed (buried) in the wall or floor, ceiling junction box, lamp box, switch box, etc. can not see The part is considered a hidden project.
What is the later electrical installation project?
The latter part of the electrical installation project generally refers to the work of home decoration entering the end after soil, wood, and paint are finished. The contents include: pipe threading, installation of switch box switch, wiring; installation of switches, sockets; installation of lamps; installation of cable TV branch Device; install visual walkie-talkie and so on.
What should be paid attention to when installing electrical concealed works?
According to the location of the electrical appliances used in home decoration design, determine the exact location of the distribution box, switches, sockets, telephone jacks, cable TV jacks, broadband network jacks, audio outlet boxes, lamps, etc., and install the elevation. The connections of the switch, socket box and pipe should be tightly sealed. The interface between the tube and tube, tube and device is applied with special glue (PVC pipe, junction box). The bending radius of the PVC threading pipe is generally 6 to 10 times the diameter of the pipe. The elbow must be a spring pipe bender specially designed for PVC pipe. The elbow and tees of the finished product should not be used. The bends and tees of the finished product generally cannot meet the bend radius. The pipe is temporarily blocked during construction to ensure threading. The inner wall of the tube is smooth, clean, and dry.
What problems should be paid attention to when threading in the pipe?
The threading in the pipe shall be performed before the threading is completed, the switch, the socket and the lamp are installed. Pipe mouth, junction box mouth should be protected by a protective ring (lock nut) protection, prevent stringing damage to the insulation of the wire. Different voltages, different circuits, and wires with different signals must not be put in the same threading tube.
Why do the wires have enough clearance in the conduit?
It is strictly forbidden to block the inside of the pipe in the threading pipe. The ratio of the cross-sectional area of ​​the general conductor to the cross-sectional area of ​​the conduit is 1:3 to 1:2. The total cross-sectional area of ​​the perforated line (plastic external insulation layer) is not greater than 40% of the internal diameter of the pipe. Adequate gaps allow the wire to dissipate the heat generated by the large current flow in the line tube.
Why can't there be joints in the threading pipe? Where should the connector be?
It is forbidden to connect the wires in the threading pipe, that is, if the length of the wire is not enough, the joint of the wire cannot be in the threading pipe, and it should be connected in the junction boxes such as switches, sockets, lamp cap boxes, etc. Otherwise, the inside of the pipe may be easily blocked and the heat radiation may be poor. Points are not easy to find, maintenance is difficult, and it may cause electrical fires.
When should the later electrical installations be carried out?
The later electrical installation works should be completed at the end of the earth, wood, and paint works, and the basic cleaning of the room can be completed. When installing, pay attention to the protection of the finished products of various types of work and prevent the pollution and damage caused by the installation.
Why is it forbidden to use mobile bedside lamps?
The movable bedside light switch is connected to the switch by a soft insulated wire. If the wire and the switch are separated during use, the exposed live wire ends may cause fire or electric shock.
How to determine the capacity of home switch box (distribution box) and the number of loops?
The home switch is selected based on the total power of the home appliance. The total power is 0.8 times the sum of the shunt functions, ie the total power
P total = (P1+P2+P3+...+Pn)×0.8 (kW)
The total switch withstand current should be
I total = P total × 4.5 (A)
Of which P total