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 has been basically not used. 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 there is no extruded envelope. 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 one end of the broken core of the cable connected to the 650V AC voltage, the other end and other cores grounded, and then can be sent to the light signal of the inductor pen for testing, testing when the inductor pen slides through the broken core, the signal will change, so that you can find to the fire-retardant cable breakage point. 3. constant current source and the bridge method in combination: this method is used for the completion of the cable or cable core has been wrapped in metal layers. This method is used for finished cables or cable cores that have been covered with a metal layer. 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 locate the fault point, is also often used a method.

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