Routine Tests Before Cable Delivery

In the cable industry, ensuring that products meet relevant standards and customer requirements before delivery is essential. Routine tests are a critical part of final quality control. These tests not only verify the performance and safety of the cables but also enhance customer confidence. Below are the common routine tests conducted before cable delivery:

1. Visual Inspection

Check the overall appearance of the cable, including the sheath, insulation, and conductor, for physical damage, bubbles, cracks, or other defects. This is the first step to detect abnormalities in the production process.

2. Conductor Resistance Test

Measure the DC resistance of the conductor to ensure it meets the requirements of relevant standards (such as IEC, BS, ASTM, or customer specifications). A compliant conductor resistance indicates that the cable can efficiently transmit current during operation.

3. Insulation Thickness and Deviation Check

Verify that the insulation thickness meets standard requirements and that the deviation is within the permissible range. Insulation thickness directly affects the cable’s voltage withstand capability and long-term reliability.

4. Spark Test

Perform a spark test on the insulation or sheath to ensure there are no pinholes, cracks, or other minor defects. Spark testing is usually conducted online during production, but some customers or third-party inspectors may require spot checks at the finished product stage.

5. AC Withstand Voltage Test

Apply an AC voltage higher than the rated voltage to the cable to verify whether the insulation can withstand electrical stress under operating conditions. This is one of the most important tests for ensuring cable safety.

6. Partial Discharge Test (for Medium and High Voltage Cables)

Conduct a partial discharge test on medium- and high-voltage cables to ensure that the insulation system is free of potential defects. This test is generally not required for low-voltage cables.

7. Other Customer-Specific Requirements

In certain orders, customers or third-party inspection agencies may request additional tests, such as sheath hardness testing, aging tests, or flame-retardant performance tests.

Conclusion

Through strict routine testing, cable manufacturers can ensure that their products meet standards and customer requirements in terms of safety, performance, and reliability. Routine tests are not only an essential part of quality assurance but also a necessary step for smooth delivery to customers.