One, resulting in burning black:
If the terminal is black, one of the possibilities is not necessarily black, the oxidation may also be black. So how to verify is not burning black? We take the method is to use a finger wipe, if you can erase, like soot, that is oxidized and the formation of black material, have to use sandpaper or file to wear off.
Nanjing Sanmen Bay terminal experts to remind you, here to pay attention to is: when you can never use your fingers to rub! Then another possibility is to burn black, in addition to fire and qigong master power, there is only one possibility, that is, the terminal overheating high temperature.
Second, lead to high temperature problems:
There are two possibilities: the terminal loops cause the contact resistance to be too large to overheat; the terminals are not loosened, but the circuit is overheating due to an unknown reason, such as a high supply voltage or a short load.
1, the voltage is too high. Can be checked from the source, the transformer secondary voltage - distribution box voltage - the voltage of the electrical equipment. The socket can also have a mounting fastener and a locking pin. The mounting buckle can be secured more securely to the PCB, locking the latch to lock the body and socket after installation is complete. A wide variety of socket designs can be used to insert different maternal inserts, such as horizontal, vertical or oblique to printed circuit boards. You can choose either metric wire gauge or standard gauge.
2, ground fault. You can also check from the transformer where, and then to the distribution box ground. The ground to be grounded, and the normal phase line should be excluded from the ground fault. You can use the insulation table or shake table to measure, sub-measurement, as far as possible only sub-measurement cable, wires, circuit breakers, switches and other power supply lines, it is difficult to segment the case, then unplug the weak equipment, The fuse of the sensing device.
The key to grounding is that the grounding resistance is low and the contact area is large. The former can ensure that the ground point has a close to the ground potential of the lowest possible "zero potential", which can avoid you think of thunder and lightning from the ground wire "anti-string" back, channeling into the power supply circuit. The latter can ensure that there is sufficient capacity to provide a fault current path, including lightning or short circuit failure and so on. Because the actual construction technology has been theoretically based on changes in contemporary technology and technology changes, so this way of grounding ok, ok, but also depends on the new standard is how the provisions of the specification.