An impulse-withstand request needs an equipment scope and purpose before its mounting, electrical combinations and waveform records can be agreed. DC working voltage alone does not set the test voltage. A busbar dielectric report does not automatically establish equipment surge immunity.
Distinguish dielectric impulse testing from EMC surge
IEC 61180's public scope covers dielectric tests on equipment rated no more than 1 kV AC or 1.5 kV DC. It excludes EMC testing and identifies combined impulse voltage/current tests with IEC 61000-4-5.
IEC 60060-1 addresses higher equipment-voltage testing. Confirm the applicable equipment standard and method with the laboratory, then agree voltage, polarities, repetitions and waveform requirements. A DC application does not remove the need to review these conditions.
Mark electrical combinations on the assembly drawing
We recommend including busbars, joints, supports and nearby conductive parts, identifying the applied voltage and reference potential. Define pole-to-pole, bar-to-enclosure and other required combinations, with connections for untested conductors and earth.
Preserve actual clearances, edges, openings and insulation ends. Explain the coverage of bare-part or substitute-support tests. If voltage-limiting devices are present, let the test owner address their influence rather than removing them and claiming unchanged equipment coverage.
Link generator settings to valid measurement records
IEC 61180 describes a generator and measuring system, including screening and measurement validity. Ask the laboratory to confirm the loaded test arrangement and retain measured waveforms, conditions and anomalies rather than only control-panel settings.
Agree breakdown, flashover, abnormal-waveform handling and subsequent checks before testing. Obtain detailed tolerances and acceptance from the agreed complete method and product standard. Use a suitably equipped laboratory and its high-voltage and residual-charge safety procedures.
- Confirm equipment and method scope
- Freeze mounting and electrical combinations
- Retain measured waveforms and acceptance basis
Frequently asked questions
Does passing AC withstand remove impulse requirements? Review the applicable equipment requirements; a pass alone does not make the tests interchangeable.
Is a dielectric impulse report an EMC surge report? The purpose and applied test conditions differ.
RFQ and test-plan inputs
Provide working voltage, equipment category, insulation construction, mounting and earthing. Have design and test owners agree method, voltage, waveform, polarities and repetitions. Separate busbar supply inspection from equipment qualification instead of stating a universal pass voltage.
Apply this guide to a project
Use product pages to identify the hardware family and the calculator for early estimates only. Acceptance depends on drawings, operating conditions and project tests.