What is the method of finding broken cores in flame retardant cables?

1. Energized capacitance method: some wire and cable manufacturers in this area of practice is usually used to compare the capacitance method to, find the approximate location of the broken wire. With continuous energization of the way to accurately flame retardant cable break point, this way of efficiency is very low. It generally takes about 1½ hours to find a broken wire point. This method of shielding, armoring, sheathing process has been completed flame retardant cable, it is almost impossible to find the broken core, poorly made, then also make the flame retardant cable scrap. This method is basically not used now.
2. Capacitance and induction method combined: this method is used in the core of the broken core, which requires that the core is not covered with a metal layer and no extruded protective layer. In the search for the first capacitance to find out the general location of the cable break, and then use the induced voltage method in the search for the break point, this method is very simple and fast, but also is currently the most used method. Induced voltage method is in the broken core of the cable at one end of the 650V AC voltage, the other end and other core grounding, and then use the light signal can be sent to the inductor pen for testing, testing when the inductor pen from the broken core when sliding past, the signal will change, so that you can find to the flame-retardant cable breakage point.
3. The combination of constant current source and bridge method: this method is used for the completion of the cable or has been wrapped in metal layer of the cable core. The use is to find the method is the first constant current source will be flame retardant cable broken core insulation burnt paste, breakdown, and then in the bridge method fault locator to locate the fault point, but also often used a method.

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