Precautions for operation of distribution box
1. The door of the distribution box should be equipped with a lock, and a special person is responsible for maintenance.
2. The distribution box and switch box should be inspected and maintained once a day, and records should be filled in. Inspection and maintenance personnel must be professional electricians. During inspection and maintenance, insulating shoes and gloves must be worn as required, and electrical insulating tools must be used.
3. When the accessories box is properly installed for inspection and maintenance, the corresponding power switch of the previous stage must be turned off and the power outage sign should be hung, and live work is strictly prohibited.
4. Operation sequence of power transmission: main distribution box → secondary distribution box → switch box.
5. Operation sequence of power failure: switch box→secondary distribution box→main distribution box (except for emergency cases of electrical failure).
6. When the construction site stops working for more than one hour, the switch box should be powered off and locked.
7. No sundries should be placed in the distribution box, and should always be kept clean.
8. No other temporary electrical equipment shall be attached to the distribution box.
9. When replacing the melt of the fuse, it is strictly forbidden to replace it with the melt that does not meet the original specifications.
10. The incoming and outgoing wires of the distribution box shall not bear external force. It is strictly forbidden to contact with sharp metal fractures and strong corrosive media.
In the process of daily use, the distribution box of the distribution box manufacturer needs to pay attention to its maintenance. Only by taking good care of it can it prolong its service life and give full play to its maximum performance.
When the distribution box is in use, it needs to be dusted regularly. Mainly to ensure the cleanliness of the distribution box. Secondly, it is also necessary to check whether the joints in the box are firm to ensure the reliability of the wiring. If there is any problem with it, it needs to be repaired in time. Secondly, it is also necessary to check whether there is rain or sand intrusion into the box in time. In the process of use, it is also necessary to eliminate these dangerous factors. Otherwise, it is easy to cause problems.
Through the above explanation, you have a good understanding of the maintenance knowledge of the distribution box. The distribution box must be inspected and maintained once a month, and the unqualified items must be dealt with in a timely manner, and relevant records should be made.
A circuit breaker is a device that cuts or closes the current in a circuit and provides protection to the line. It has achieved a wide range of applications. But its failure is inevitable, we should check it in time and find a solution. Here to learn together the fault check and solution of the circuit breaker.
First of all, check the operating mechanism of the panel there is no sinking situation. If it sinks, it will have a great impact on the transmission mechanism, and the contact stroke associated with it will be obstructed, and the possibility of successful closing will be reduced, thus causing problems. So what are the solutions? In fact, you just need to adjust the screw of the lower screw loose panel, fix it, lift the panel gently upward, fix the screw again, and there will not be much problem.
The correct position of the stopper is also closely related to the normal operation of the circuit breaker. In the guide above the stop, we find that its position is not correct when you can adjust to avoid more serious things. Use the stop to top the outside of the half-shaft, which is to keep the half-shaft and jump buckle, thus avoiding many failures.
Failure is also likely to occur on the loss-of-voltage decoupler. When it is not in the correct suction position, its metal piece will make the decoupling mechanism move under the action of spring force. We should have to check the filter capacitor. Then see if the loss of voltage decoupler coil has an open circuit, see if there is any deformation of the metal above, and pay attention to the metal sheet and the top bar away from each other within about 0.5 to 1 mm. Among the above details, if the filter capacitor is bad, it is necessary to replace it in a timely manner, and the loss-of-voltage decoupler coil should also be replaced when it is open, the spring plate should be corrected for deformation, and the gap needs to be adjusted.
If the shunt release in the suction position, what will be the impact on the circuit breaker? It will appear to trip after closing. When we check, we mainly look at the contacts of its circuit break button has not been sintered together. If its metal deformation, or the gap is not right, the possibility of tripping is also very large.
For the inspection of the free release device, you need to observe whether the cover plate is deformed, and then observe the effective size of the live knuckle bolt inside the free release device mechanism is not within a reasonable range. If the cover plate is deformed, you can remove it for correction, the size of the problem requires you to remove the cover plate and remove the cotter pin, adjust the knuckle bolt, connect the center of the three axes just so that it is in the center of the three round holes in the cover plate. See the above failure analysis of each detail, I hope it can help friends better use, only careful inspection, can reduce the occurrence of failure.
China SINGI GROUP established in 1995, formed by ZHEJIANG SINGI ELECTRICAL LLC、SHANGHAI SINGI ELECTRICAL CO.,LTD、SHANGHAI SINGI WIRE AND CABLE CO.,LTD、ZHEJIANG JONAN METAL STAMPING CO.,LTD, registered capital more than USD 10millions, committed to building electrical & intelligent household integrator(Intelligent household products、power distribution control system products、illuminating control system products) and low-voltage electrical appliances’ metal accessories R & D、production and sales.
China SINGI GROUP established in 1995, formed by ZHEJIANG SINGI ELECTRICAL LLC、SHANGHAI SINGI ELECTRICAL CO.,LTD、SHANGHAI SINGI WIRE AND CABLE CO.,LTD、ZHEJIANG JONAN METAL STAMPING CO.,LTD, registered capital more than USD 10millions, committed to building electrical & intelligent household integrator(Intelligent household products、power distribution control system products、illuminating control system products) and low-voltage electrical appliances’ metal accessories R & D、production and sales.
Correct line configuration scheme skills can save time and lines, which requires us to master certain techniques and skills. Follow these tips to wire for best results. Necessary safety measures should be taken when arranging power distribution equipment. If there is a bare charged body with a dangerous potential, it should be covered or placed out of the reach of people.
1. Address selection. The location of the low-voltage power distribution room should be close to the load center, set in a place with less dust, less corrosive medium, dryness and slight vibration, and appropriate room for development should be reserved;
2, the layout of power distribution equipment. The layout of the power distribution equipment in the low-voltage power distribution room must follow the principles of safety, reliability, applicability and economy, and should be convenient for installation, operation, handling, maintenance, testing and monitoring. Appropriate distances and passage exits must be reserved for high-voltage electrical equipment and low-voltage electrical equipment in the same room, as well as power distribution cabinets arranged in rows. Necessary safety measures should be taken when arranging power distribution equipment. Bare live objects with dangerous potential should be shielded or placed out of reach of people. Barriers can be used for protection when it is difficult to use shields and covers
3. The layout of the distribution line should meet the conditions: conform to the characteristics of the site environment; conform to the characteristics of the building; the degree of accessibility between people and the wiring; the electromechanical stress that may occur due to short circuits; the wiring may be during installation or in operation. Other stresses experienced and the self-weight of the wire.
Fourth, the layout of the distribution line should avoid the influence of the external environment: the influence of the thermal effect of the external heat source should be avoided; the damage caused by the intrusion of water or the entry of the group objects should be prevented during use; the external mechanical Influence caused by sexual damage; In places with a lot of dust, the influence caused by dust gathering on the wiring should be avoided; The damage caused by strong solar radiation should be avoided.
1. In common parlance, the distribution of electrical energy is called the distribution box. Mainly used for the control of electrical equipment, power distribution, overload, short circuit, leakage of the line to play a protective role. Distribution boxes are installed in various places, such as schools, institutions, hospitals, factories, workshops, families, such as lighting distribution boxes, power distribution boxes, etc.
2. Switchgear is a complete set of switchgear and control equipment. It is used as power center and main distribution device. It is mainly used for the control, monitoring, measurement and protection of power lines and main power equipment. Often set in substations, distribution rooms, etc.
Distribution box and switchgear in addition to the function, installation environment, internal structure, controlled objects, etc., the significant feature is that the size of the shape is different, distribution box volume is small, can be concealed in the wall, can stand on the ground; and switchgear volume is large, only the device in the substation, distribution room.
3. Control box is used inside and outside of various buildings, as power, lighting distribution and motor control, suitable for indoor wall, outdoor floor installation of power distribution equipment. It is mainly used for fire pump control, submersible pump control, fire fan control, fan control, lighting distribution control, etc. The control methods are direct start control, star delta buck start control, self-linked buck start control, inverter start control, soft start control, etc. Various control methods can also be used for isolation switch and fuse type switch as isolation breaking point.
4. Power distribution cabinet is assembled with switching equipment, measuring instruments, protection appliances and auxiliary equipment in enclosed or semi-enclosed metal cabinets or on the screen width according to the electrical wiring requirements, which constitutes a low-voltage power distribution device. Normal operation with the help of manual or automatic switch to turn on or break the circuit. There are many classifications of power distribution cabinet. Its fault or abnormal operation with the help of protection appliances to cut off the circuit or alarm. With the help of measuring instruments, it can display various parameters in operation, adjust certain electrical parameters, prompt or signal deviation from normal working condition. It is commonly used in various power generation, distribution and substations.
Below we will list several technical specifications for electrical distribution box wiring.
1、The wire should be connected to the designated terminal block correctly in strict accordance with the drawing markings.
2、Wire
A. The wire cross-section of the main circuit is marked in accordance with the drawing, the wire cross-section of the control circuit is 1mm2, and the wire cross-section of the multi-core cable is 0.3mm2.
B. 4mm2 (including) above the wire for the black RV type, 4mm2 below the wire for the white RV type, the cable sheath color selection black.
C. Stripping the wire insulation should be used to strip the special stripping tools, do not damage the core, nor damage the insulation not stripped, the incision should be flat.
D. Set the wire end of the insulation stripped length of L, when the wire end inserted into the terminal, L take the core inserted into the length of the tubular joint sleeve L1 plus 1 ~ 2mm, that is, L = L1 + (1 ~ 2), the wire stripped and terminal crimping, all copper wire must be through the terminal sleeve, 0.5mm2 wire must be folded through the terminal sleeve.
E. Can not use the terminal wire joints, insulation stripped should be laid on the solder, wire laying shall not be the middle butt, in special occasions need to butt, must use the welding method, welding after the heat-shrinkable tube protection.
F. Wires and components connected, should choose the shortest path, the cabinet PLC input circuit wiring as far as possible and the main circuit and other voltage level circuit control lines laid in the same line slot.
G. Wires and panel components connected to the panel wireless slot, should use winding tube protection. Panel harness and cabinet connection, should consider the cabinet door switch when the harness shall not be subject to friction.
H. Avoid several wires to the same terminal, components on the same terminal wire connectors shall not exceed 2, when two wire connectors to the same terminal, the contact should be flat paste, good.
I. The same line number of more wires and can not all be fastened on the terminal block, you can use the end terminal multiple crimp, but this practice is only suitable for control of the wire.
J. Wires and connectors between the welding, should be in the wire and connectors on the first laying on the solder, welding should be solid and reliable, welding must use heat-shrinkable tube protection.
K. Wires laid in the line groove should be flat, relaxed, no additional tension and pressure on the wire, nor the wire in the line groove squeezed into a mass.
3、Terminal
A. wire and component connections, must be pressed on the cold press terminals, except in special circumstances, shall not be stripped of the wire, directly to the device.
B. The terminal diameter of the line number tube must match the wire, the shape of the connection port must match the component terminals, control circuits can use fork-shaped terminals, motor terminals, heating power terminals, grounding terminals and some main circuit terminals, you must use ring terminals to increase the contact area, some connectors must use pin terminals.
C. Terminal crimping must use a special terminal crimping pliers, crimping when using the pressure interface must match the terminal, crimping, the wire and the terminal must be in good contact with each other, solid.
D. After the wire terminal crimping, connected to the component, should be through the nearest distance of the wire slot teeth, and the component end angle to maintain at 90 °, the tilt shall not exceed 5 °.
E. Terminals and components connected to the terminal, should be inserted into the terminal as far as possible, contact should be flat, good, screw tightening using the torque should be appropriate.
F. All the terminals must be set on the line number sleeve, the main circuit terminals after crimping, can not set on the sleeve, should use heat-shrinkable tube protection.
4、Wire number sleeve
A. Line number sleeve has two roles, one is to protect the bare terminal crimp part of the insulation, the second is to mark the wire line number.
B. Line number sleeve selection must match the cross-section of the wire, print the wire number, select the font size must match the tube diameter of the sleeve.
C. Control circuit line number length of 25mm, the main circuit casing diameter φ 5mm line number length of 30mm.
D. Before the terminal crimping, you must first set the printed line number sleeve, the sleeve should be set in the bare terminal sleeve part beyond 1 ~ 1.5mm, the font direction parallel to the front of the component.
E. After the terminal fastening, the corresponding line number in the vertical direction when looking at the flow of reading from the bottom up; in the horizontal direction when looking at the flow of reading from the left to the right.
F. Each wire ends of the line number is unique, forbidden a wire set with a different line number.
G. When the wire cross-section can not choose the corresponding casing, you can use nylon ties to fix the casing on the wire, read the flow direction as above, the cable markings are also used in the same way.
Through the above technical specifications of the power distribution box, you have further understanding of the distribution power box.
Singi Electrical, founded in 1995, is a high-tech enterprise which specializing in manufacturing and marketing of low-voltage circuit breakers...
