During normal operation and maintenance cycles wire/cable are subjected to stresses, both mechanical and environmental, that challenge the integrity of wire/cable insulation. The wrap back test subjects wire/cable specimens to a very tight bend diameter in addition to conditioning at elevated temperatures to determine if a specific insulation is prone to cracking. A specimen is considered to have passed if, after elevated temperature exposure, the insulation has any visually detectable cracks or identifiable damage.
Insulation Wrap Back Test
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Perform visual examination of the specimen. Record any defects.
Firmly wrap the specimen upon itself for four close turns.
Condition the specimen as determined in the test specification (specimen conditioning typically includes elevated temperature exposure for several hours).
After conditioning, examine the specimen and record observations.