Kohler — Wire Insulation Breakdown Test Procedure
Testing & diagnosis · Transfer switch wiring/insulation
From a Kohler service manual — check it applies to your exact model before use.
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Before you start
- Only authorized personnel should open the enclosure.
Procedure
- Disconnect all power sources and disconnect the load from the transfer switch.
- Disconnect the transfer switch wiring harness from the controller at connector P1.
- Use a hi-pot tester or meggar to check insulation resistance phase-to-phase, phase-to-neutral, and phase-to-ground.
- For a hi-pot tester, maximum potential is 500 VAC and maximum test time is 1 second.
- Verify that measured insulation resistance exceeds 1.24 megohms.
- If less than 1.24 MOhm, isolate the leakage current and replace faulty components.
Tools required
- Hi-pot tester or meggar Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Insulation resistance > 1.24 MOhm
- Hi-pot max 500 VAC, 1 second
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.