Which voltage value is commonly used for insulation measurements in a hipot test?

• A. 250 volts
• B. 500 volts
• C. 1000 volts
• D. 750 volts

Answer: (A)

Hipot testing checks dielectric withstand by applying a voltage higher than the device’s normal operating voltage to reveal insulation weaknesses and leakage paths. The voltage used should stress the insulation enough to expose potential faults but not damage the device.

For many low-voltage products, a standard test level around 250 volts is commonly used because it provides a meaningful stress above typical mains levels (such as 120 or 230 V) while staying within safe, practical testing limits. Higher voltages, like 500 V or 1000 V, are reserved for equipment designed for higher mains voltages or stricter standards. A value like 750 V isn’t a typical general-purpose insulation test level. So 250 volts is a practical, widely used choice for basic insulation withstand testing in many scenarios.