Is it true that a high test voltage from a hipot test will damage a device or cable in good working order?

The correct interpretation is that a high test voltage from a hipot test does not damage a device or cable that is in good working order. A hipot (high potential) test is conducted to determine the insulation strength of electrical devices by applying a voltage that is typically higher than the normal operating voltage.

When a device or cable is in good condition, it is designed to withstand voltages much higher than the typical operational levels. The purpose of a hipot test is to ensure that the insulation can handle unexpected stress without breaking down. If the insulation can withstand this high test voltage without showing signs of failure such as arcing, breakdown, or excessive leakage current, it indicates that the device or cable is indeed in good working order.

While excessive voltage, physical defects, or improper testing procedures could lead to damage, a well-conducted hipot test on a well-maintained device should not cause harm. Therefore, the key takeaway is that a good quality device or cable will not sustain damage from a high test voltage used in a hipot test when all conditions are appropriate.