Yes, there are specific polarity guidelines for insulation resistance tests:

1. The test uses negative voltage, based on the JIS1302 standard.
2. Connection guidelines:
   HIGH side: Connect to the input side of the DUT (negative voltage).
   LOW side: Connect to the ground side of the DUT.

Following these guidelines will allow you to perform the test with the correct negative voltage polarity.

Note: These guidelines are based on the JIS1302 standard, which is applicable in Japan.
For international standards or practices, please refer to the appropriate guidelines for your region or industry.