Short-circuiting of household appliancesThe main reason for the short circuit is:
(1) the insulation selection is not appropriate, such as voltage grade is high, the insulation level is low;
(2) subjected to high temperature, humidity, corrosion loss of insulating ability;
(3) tied with a wire conductor or hang insulation on the metal;
(4) lon...
About the communication cable e-test projectThe main test items are wire dc resistance, unbalanced circuit resistance test, dc, ac withstand voltage test and insulation resistance, capacitance testing, capacitance loss test, and capacitance unbalance, crosstalk attenuation and crosstalk defense degree test, the primary and secondary cable tran...
The focus of the system of safety technical measuresTransportation and storage
1, in the process of transportation loading and unloading, should not make the cable and cable damage. It is forbidden for the cable directly pushed down by the car. The cable should not be flat, flat storage transport.
2, transportation or rolling cable, must ensure that t...
What needs to be done at the time of project handover and acceptance(1) all the channels, the foundation of the tunnel and shaft, the equipment, and shall be finished with cable interlining, and comply with the design requirements, embedded parts must be complete, and firm, drainage issue should be complete, the lighting should also be complete;(2) chann...
Preparation of cable laying(1) According to the design drawings, familiar with master each link, the first audit arrange profile if there is a crossover cable, whether reasonable, the location of the cable bracket creating every cable, for laying cables.(2) To avoid waste, collect cable arrived, verify the actual length and the length are appropriate d...
Things to pay attention to when the power cable is faulty1, The selection of testing ground. Measured cable selection principles for the failure of a conductor to phase and its formation and high voltage power supply and sampling tester is strictly to form a closed loop its equivalent in the closed loop should not have larger equivalent resistance (in addit...
About cable ontology and joint inspection program
1, bare cable outer sheath, bare steel belt, intermediate head, outdoor head with and without damage or corrosion.
2, outdoor head sealing performance is good.
3, outdoor head of terminal blocks, the ground connection is firm.
4, the terminal end of the presence of creepage trace lead, adequacy o...
Signal loss is just a fact of life.As it turns out, every cable, even a perfect one, has some loss from end to end. Think of it this way: You're driving along and you turn off the engine. You don't keep moving at the same speed... you immediately begin to slow down. Part of this is due to the air pushing against your car. However, some of it is due to the fact th...
Types of coaxial connectors
The F connector, shown in the picture above, is the most common for cable, satellite, and HDTV uses. It uses a hexagonal, screw-on outer shell that can be tightened with a 7/16" or 11mm wrench. It can also be configured as a push-on connector, and we'll discuss the benefits of that a little later in the article.
The BNC conne...
Why should power cables be shielded?The most important reason is safety. Shielding is used to confine a cable's dielectric field to the inside of the cable's insulation. This protects anyone from contacting the insulation from exposure to the voltage gradient within the insulation. Without the shield there are two capacitors in series having d...
