BS 7808:1995 Electrical insulating materials. A.C. voltage endurance evaluation. Introduction
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This technical report explains many of the factors involved in Voltage Endurance tests on electrical
insulating materials. It describes the Voltage Endurance graph, lists test methods illustrating their
limitations, and gives guidance for evaluating the a.c. Voltage Endurance of insulating materials from the
results of the tests.
The terminology to be used in Voltage Endurance is defined and explained. It must be emphasized that this
technical report is concerned with materials, and the results may not be directly applicable to the
performance of insulating systems1)
.
Voltage Endurance tests are used to compare and evaluate insulating materials in view of their various
applications in electrical systems. Determining the ability of electrical insulating materials to endure a.c.
voltage stress is very complex. The results of Voltage Endurance test procedures are influenced by many
factors, so this technical report should only be considered an attempt to present a unified view of Voltage
Endurance for simplified planning and analysis. This report is an introduction with general purposes: some
documents for the various practical cases exist and others are being developed.
It should be recognized, however, that it is not possible from the results of the test to draw conclusions
about the performance of the materials in service in an insulating system.
