What is the pinhole in enameled copper wire?


A recent report showed that, on average, 4 out of 10 re […]

A recent report showed that, on average, 4 out of 10 residential fires are due to electrical problems. Many of these incidents can be traced back to faulty electrical systems, with defective wiring often being the primary cause. In industrial scenarios, the risk of using defective wires is enormous. Therefore, the importance of careful testing of wire quality cannot be overemphasized.

Enamelled copper wires and conductors are widely used in various electrical equipment in residential, commercial, and public places. To ensure that the manufactured wire is safe to use, the manufacturer uses the "pinhole test" method to check the wire's skin/coating for any damage and/or any problems with the adhesive properties of the copper wire. The best quality copper wire needs to have uniform electrical strength at all times. However, some points of insufficient electrical strength and capacity may remain in the wire. These spots are called "pinholes".

In other words, a "pinhole" is a discontinuity in the enamel coating/covering of a copper conductor. While a certain number of such "pinholes" are allowed according to industry standards, checking their quantity is extremely important to gauge the overall quality of the copper enameled wire. This is where the pinhole tester is so important.

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