BS EN IEC 60156:2025 - TC

This standard BS EN IEC 60156:2025 - TC Tracked Changes. Insulating liquids. Determination of the breakdown voltage at power frequency. Test method is classified in these ICS categories:

• 29.040 Insulating fluids
• 29.040.01 Insulating fluids in general

IEC 60156:2025 specifies the method for determining the dielectric breakdown voltage of insulating liquids at power frequency. The test procedure is performed in a specified apparatus, where the oil sample is subjected to an increasing AC electrical field until breakdown occurs. The method applies to all types of insulating liquids of nominal viscosity up to 350 mm2/s at 40 °C. It is appropriate both for acceptance testing on unused liquids at the time of their delivery and for establishing the condition of samples taken in monitoring and maintenance of equipment.