Q:What brand of cable is good, what are the top ten brands of wires?

Mainly to distinguish the ground which is the ground, the color of the ground is generally yellow-green; wire two is the fire line L and zero line N, no ground wire, look at the plug on the LN mark, the corresponding good.

Q:IPadmini. The latest version 7.1.1 up in the morning to see the non-stop display this cable is not certified does not support this feature. The The Charger original. Not on the computer charge. The Ask God to answer more

The problem lies in the charger between the machine, IPAD charging is to a charging protocol to complete, when the IPAD did not receive the agreement signal will be prompted: do not support this accessory, Apple's products have charging protocol, charging Is through the data line in the two lines and IPAD transmission charging protocol signal when ipad received the charging protocol signal after the machine internal charging circuit began to open the internal charging circuit to charge, the problem is to accept the charge signal is not so prompted not to Support, change the line to try

Q:Four lines only reached a phase line, at the other end all charged, I use the digital pen! In addition, I often check the cable when the cable current through the dot digital pen voltage symbols sometimes have time to disappear, in other bare wires when the test keys are normal! What is this going on! Ask the heroes to give the younger brother a complete point of the answer! More

Bookstore tool book should have "communication project budget", I do is what you say, the budget is divided into estimates and budget, is two steps. So that is not very clear. But what is needed is the preliminary design of the project. The budget is needed for design and drawings. Internal management of this piece, the main thing is that you need to do what the project department, and are generally very complicated

Q:How to determine how much wire and cable should be used, the current load and how the corresponding wire, such as 4BV, under what circumstances, YJV240 what circumstances, the load is much more

The second floor of the formula is correct, my space also have this formula, with armor and no armor in the current no difference, there are differences in the installation, usually buried to armor, overhead or bridge without armor, you give the model is not Armor, YJV-4 * 240 without armor, YJV-22-4 * 240 armor,

Q:What is the warranty period for wire and cable?

Wire and cable warranty period is 30 years of national warranty period. But the specific warranty period according to the type of wire and cable and the use of conditions and temperature and applicable methods to determine. General cable maintenance period is about 15 years, but to ensure that the normal use of the environment, such as the amount of temperature is below 70 degrees, but you are more than 70 working environment to use, of course, may not be used for a year. Therefore, the most important thing is to follow the instructions to use.

Q:Why does the bird stand on the wire without anything, but if people touch it,

National standard line, no problem. Do not pick up the heater in winter. If not the national standard line, that copper is not easy to go wrong, then use, from time to time touch the line is not hot, there is no problem.

Q:What are the T and T, s of the wire and cable test type?

May be charging head of the problem, the line may also be a problem. If the warranty can be free for the change.

Q:Apple 6 Charging Why always show this cable has not yet been certified

Set-top box with the AV cable connection: yellow - video, red and white - audio, corresponding to the TV's AV input interface can be connected (do not receive the TV component interface). As for the emergence of partial pink, the possible reasons are: . poor contact. You will re-connect the three-color AV cable to the set-top box, on the TV, to ensure good contact. . cable quality. Three-color AV cable may not be the quality, if you can replace a group of try, or use the DVD and other equipment connected with the TV to test the AV line with or without problems. . TV AV input failure. You can use other video source equipment connected to the TV test, such as: DVD, VCD machines and so on. . set-top box failure. May be set-top box AV output port problems, if there are multiple sets of AV output, you can try other port okay, not the case may be the quality of set-top box, call customer service it.

Q:Cable a fire line power and why the other did not pick up the line with a pen test also have electricity? Answer detailed point

Megohmmeter, such as measuring insulation normal, that is, induction power, the other line after grounding, the pen measured no electricity.

Q:This cable or accessory has not been certified and may not be able to work with this iphone reliably

The installation process is a certain requirement, high and low voltage cable bridge should be installed separately as usual, a wall laying vertical pipeline (slot) or installation equipment, the power distribution between the depth of D1 = 1200 ~ 1500mm; weak Between the deep distance from the D2 = 1100 ~ 1400mm more reasonable. The length L1 and L2 between the power distribution and the weak can be determined according to how much electrical equipment and pipelines (slots) are installed in the room. "Civil building electrical design specifications" proposed "shaft size in addition to meet the wiring spacing and terminal box, distribution box layout must be the size, but also in the box before the left not less than 0.8m operation, maintenance distance" requirements. In the weak equipment, the operation and maintenance distance is not specified in the provisions of the Code for Electrical Design of Civil Buildings, but it should not be less than 0.8m. Cable to wear steel pipe wiring, should be reserved in the floor steel pipe, wiring should be completed after the plug fire fire blocking material. Cable bridge installation should be horizontal, the maximum sag should not be greater than 10 mm; proposed separate installation